Medium-Voltage Switchgear

Type 8DB10Extendable Fixed-Mounted Circuit-Breaker Switchgear up to 40.5 kV

Double Busbar, Single-pole Metal-Enclosed, Gas-Insulated

Medium-Voltage Switchgear

INSTALLATION AND
OPERATING
INSTRUCTIONS

Order No.: 864-5091.9

Revision: 06
Issue: 26-02-2016
About these Instructions
These instructions do not purport to cover all details or To connect or install devices from other manufacturers,
variations in equipment, nor to provide for every possible the associated user information and ratings have to be
contingency to be met in connection with installation, considered.
combination of components, or operation.
If you want to make suggestions for improvement of these
Should further information be desired or should particular instructions, or if there is something you do not understand,
problems arise which are not covered sufficiently by these please contact the address given below:
instructions, the matter should be referred to your regional
Siemens AG
Siemens representative.
Energy Management
The contents of this instruction manual shall not become
part of or modify any prior or existing agreement, Medium Voltage & Systems
commitment or relationship. The Sales Contract contains Switchgear Factory Frankfurt
the entire obligations of Siemens. The warranty contained
in the contract between the parties is the sole warranty of Carl-Benz-Str. 22
Siemens. Any statements contained in this instruction D-60386 Frankfurt
manual do not create new warranties or modify the existing
warranty. Germany
Subject to change without prior notice.

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Contents
Safety instructions ............................................. 6 18.7 Gas leakage rate............................................... 47
1 Signal terms and definitions ............................... 6 18.8 Rating plates .................................................... 48
2 General instructions ........................................... 7 18.9 Overview of busbar covers................................ 49
3 Due application .................................................. 8 Installation........................................................ 50
4 Qualified personnel ............................................ 8 19 Constructional stipulations ............................... 50
Description ....................................................... 10 19.1 Switchgear room.............................................. 50
5 Features........................................................... 10 19.2 Constructional data of the foundation .............. 53
6 Panel types....................................................... 11 19.3 Transport units................................................. 57
7 Examples for panel versions ............................. 12 20 Before installation ............................................ 59
8 Panel design..................................................... 20 20.1 Preliminary clarifications................................... 59
8.1 Function .......................................................... 20 20.2 Intermediate storage ........................................ 59
8.2 Subframe ......................................................... 20 20.3 Tools/auxiliary means ....................................... 61
8.3 Low-voltage compartment ............................... 20 20.4 Installation and fixing material ......................... 62
8.4 Switchpanel pole.............................................. 20 20.5 Comments on electromagnetic compatibility .... 62
8.5 Switchgear panel ............................................. 21 21 Unloading and erecting the transport units ....... 63
9 Circuit-breaker ................................................. 22 21.1 Packing and transport unit................................ 63
9.1 Design ............................................................. 22 21.2 Checking the delivery for completeness and
transport damage............................................. 63
9.2 Operating mechanism box................................ 23
21.3 Checking the SF6 gas pressure.......................... 64
9.3 Equipment ....................................................... 23
21.4 Unloading transport units................................. 65
10 Disconnector and three-position
disconnector .................................................... 24 21.5 Transporting the units to the place
of installation ................................................... 66
11 Make-proof busbar earthing switch .................. 27
21.6 Setting down the transport units at the place
12 Current and voltage transformers ..................... 28
of installation ................................................... 68
12.1 Voltage transformers........................................ 28
21.7 Aligning the switchgear.................................... 70
12.2 Current transformers ........................................ 29
22 Assembling the switchgear............................... 71
13 Gas compartments ........................................... 30
22.1 Preparing busbar assembly ............................... 71
14 Panel connection.............................................. 32
22.2 Installing transport units................................... 74
14.1 Features........................................................... 32
22.3 Installing further transport units ....................... 77
14.2 Panel connection versions for cable plugs ......... 32
22.4 Completing switchgear installation................... 77
15 Voltage detecting systems ................................ 34
23 Installation work with SF6 gas before
16 Aseismic design (option) .................................. 38 commissioning................................................. 84
17 Accessories ...................................................... 39 23.1 Completing busbar assembly and filling
17.1 Standard accessories ........................................ 39 with SF6 gas .................................................... 84

17.2 Other accessories ............................................. 40 23.2 Installing the panel connections supplied
in the accessories, and filling
18 Technical data .................................................. 42 the circuit-breaker housing with SF6 gas........... 87
18.1 Electrical data................................................... 42 24 Performing the power- frequency
18.2 Vacuum circuit-breaker..................................... 42 voltage test ...................................................... 93
18.3 Insulating gas SF6 ............................................ 44 25 Installation work with SF6 gas after
the power-frequency voltage test ..................... 95
18.4 Classification of 8DB10 according to
IEC 62 271-200 ................................................ 46 25.1 Installing solid-insulated bars at the panel
connection, and filling the circuit-breaker
18.5 Standards, specifications, guidelines................. 46 housings with SF6 gas ...................................... 95
18.6 Phase sequence................................................ 47 26 Installing voltage transformers ......................... 96

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26.1 Installation of voltage transformers Operation ........................................................146
type 4MT3 on the busbar ................................. 97
35 Control elements and indicators..................... 146
26.2 Installation of voltage transformers
36 Circuit-breaker operation ............................... 148
type 4MU4 on the busbar............................... 101
36.1 Closing the circuit-breaker manually............... 148
26.3 Installation of voltage transformers
type 4MT7 at the cable feeder........................ 104 36.2 Opening the circuit-breaker manually............. 148
27 Removal of voltage transformers.................... 107 36.3 Emergency release of the circuit-breaker ........ 149
27.1 Removal of voltage transformers 36.4 Recommendation for sealing
type 4MT3 from the busbar............................ 107 the pushbuttons ............................................ 150
27.2 Removal of voltage transformers 36.5 Test operation without auxiliary voltage ......... 150
type 4MU4 from the busbar ........................... 109 36.6 Test operation with auxiliary voltage
27.3 Removal of voltage transformers (motor operating mechanism) ....................... 151
type 4MT7 from the cable feeder ................... 111 36.7 Charging the closing spring manually............. 151
28 Busbar components ....................................... 113 37 Operating the three-position disconnector ..... 152
28.1 Voltage transformer damping resistor ............ 113 37.1 Control elements and indicators..................... 152
28.2 Voltage transformer with or without 37.2 Closing the three-position disconnector
three-position disconnector ........................... 114 manually ....................................................... 154
28.3 Solid-insulated bar (V-type bar) ...................... 116 37.3 Opening the three-position disconnector
28.4 Gas-insulated bar ........................................... 120 manually ....................................................... 155
28.5 Busbar connection S2 and S3 ......................... 124 37.4 Activating the ready-to-earth function
manually ....................................................... 155
28.6 Busbar earthing switch................................... 126
37.5 Deactivating the ready-to-earth function
28.7 Capacitive voltage tap at the busbar ............... 127
manually ....................................................... 157
29 Tests.............................................................. 128
37.6 Three-position disconnector with auxiliary
29.1 Checking the SF6 gas filling ........................... 128 voltage (motor operating mechanism) ........... 157
29.2 Monitoring the gas pressure........................... 129 37.7 Emergency release of the interlock
29.3 Checking the circuits of the low-voltage with solenoids at the three-position
equipment..................................................... 130 disconnector.................................................. 158

29.4 Checking high-voltage connections ................ 130 37.8 Emergency operation of the three-position
disconnector.................................................. 159
29.5 Checking electrical connections ..................... 130
38 Feeder earthing and de-earthing .................... 166
29.6 Checking protection against environmental
influences...................................................... 130 38.1 Feeder earthing ............................................. 167

30 Final installation work .................................... 131 38.2 Feeder de-earthing ........................................ 167

30.1 Mounting cables with plugs ........................... 131 39 Operating the busbar make-proof earthing
switch............................................................ 168
30.2 Connecting low-voltage cables....................... 131
39.1 Control elements and indicators..................... 168
30.3 Mounting the metal covers ............................ 132
39.2 Closing .......................................................... 169
31 Installation of degree of protection
version IP31D................................................. 133 39.3 Opening ........................................................ 170

31.1 IP31D - protection against vertically 39.4 Emergency release of the interlock with
falling water drops ......................................... 133 solenoids at the busbar earthing switch.......... 171

32 Installation of rear walls of switchgear ........... 135 40 Interlocks....................................................... 173

33 Installation of end walls ................................. 138 41 Verification of safe isolation from supply ........ 176

34 Commissioning .............................................. 143 41.1 LRM plug-in sockets ....................................... 176

34.1 Checking the installation work ....................... 143 41.2 Indications VOIS, VOIS R+,
CAPDIS -S1+/-S2+ ........................................... 177
34.2 Test operation................................................ 143
41.3 Indications WEGA 1.2, WEGA 2.2.................... 179
34.3 Checking the accessories................................ 145
42 Overview of switching operations .................. 180
34.4 Correcting circuit diagrams ............................ 145
42.1 Switching operations
34.5 Instructing the operating personnel ............... 145 in the circuit-breaker panel ............................ 180

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42.2 Switching operations in 44.1 Switchgear maintenance ................................ 203
the bus sectionalizer panel ............................. 188 44.2 Safety instructions.......................................... 203
42.3 Switching operations in 44.3 Maintenance recommendation....................... 203
the bus coupler panel ..................................... 192
44.4 Procedure for bolted joints and seals .............. 204
42.4 Switching operations in top-mounted bus
sectionalizer, system 1 ................................... 194 44.5 Maintenance of the vacuum circuit-breaker
operating mechanism..................................... 205
42.5 Switching operations for
disconnectable voltage transformers .............. 199 44.6 Cleaning agents and cleaning aids .................. 206
43 Cable testing .................................................. 201 44.7 Lubricants ...................................................... 207
43.1 Test voltage ................................................... 201 44.8 Switchgear extension and replacement of
panels and components ................................. 207
43.2 Safety instructions.......................................... 201
44.9 Spare parts..................................................... 207
43.3 Function test.................................................. 202
45 End of service life ........................................... 208
Servicing......................................................... 203
Siemens Service Hotline ................................. 209
44 Maintenance .................................................. 203
Index ............................................................... 210

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Safety instructions

Safety instructions
1 Signal terms and definitions

DANGER
as used in these instructions, this means that personal injuries can occur if the relevant
precautionary measures are not taken.
➭ Observe the safety instructions.

ATTENTION
as used in these instructions, this means that damage to property or environment can occur
if the relevant precautionary measures are not taken.
➭ Observe the safety instructions.

NOTE
as used in these instructions, this points at facilitations of work, particularities for operation or
possible maloperation.
➭ Observe the notes.

Symbols used ➭ Operation symbol: Identifies an operation. Asks the operator to perform an operation.
✔ Result symbol: Identifies the result of an operation.

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 Safety instructions

2 General instructions
Independently of the safety instructions given in these operating instructions, the local laws,
ordinances, guidelines and standards for operation of electrical equipment as well as for labor,
health and environmental protection apply.

DANGER
Any kind of modification on the product or alteration of the product must be coordinated with
the manufacturer in advance. Uncoordinated modifications or alterations can cause the
expiration of warranty claims, cause danger to life, limb and other legally protected interests.
The fulfillment of the type tests (according to IEC 62271-200) may not be guaranteed
anymore. This applies especially though not exclusively to the following actions, e.g. in the
course of maintenance or repairs:
➭ Original Siemens spare parts were not used.
➭ Service engineers performing replacement were not trained and certified by Siemens.
➭ Parts were fitted or adjusted incorrectly.
➭ Settings were not made in accordance with Siemens specifications.
➭ After installation and setting, no final check was performed by a service engineer approved
by Siemens, including documentation of the test results.
➭ Maintenance was not done according to the operating instructions of the Siemens
products.

Five Safety Rules of The Five Safety Rules of Electrical Engineering must be complied with during operation of
Electrical Engineering the products and components described in these operating instructions:
• Isolate.
• Secure against reclosing.
• Verify safe isolation from supply.
• Earth and short-circuit.
• Cover or barrier adjacent live parts.

Hazardous substances If hazardous materials are required to perform the work, the relevant safety data sheets and
operating instructions must be observed.

Personal protective For switchgear with proven internal arc classification according to IEC 62271 Part 200,
equipment (PPE) no protective equipment is required for operating the switchgear.
To work on switchgear where covers have to be removed, personal protective equipment has
to be worn for protection against hot gases exhausting in case of internal arc. In case of
internal arc, full personal protection is not guaranteed, even if the personal protective
equipment is worn.
To select the protective equipment, the national standards and specifications of the
corresponding authorities and professional associations must be observed and accomplished.
The protective equipment consists of:
• Protective clothing
• Safety shoes
• Gloves
• Helmet and face protection
• Ear protection

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Safety instructions

Remove the front plate of the operating mechanism compartment

DANGER
Risk of injury by release of charged operating springs when the front plate of the operating
mechanism is removed! Bruises or cuts at the hands can be the consequence.
➭ To avoid impermissible switching operations, switch off auxiliary voltage.
➭ To discharge the spring energy store in the operating mechanism, perform the following
operations before removing the cover:
- Trip the miniature circuit-breaker.
- Actuate the OFF pushbutton.
- Actuate the ON pushbutton.
- Actuate the OFF pushbutton.
- Disconnect the control cables from the low-voltage compartment.

➭ The spring energy store indicator must show "spring not charged".

Fig. 1: Indication: "Spring not Fig. 2: Indication: "Spring

charged" charged"

3 Due application
The switchgear corresponds to the relevant laws, prescriptions and standards applicable at the
time of delivery. If correctly used, they provide a high degree of safety by means of logical
mechanical interlocks and shockproof metal enclosure of live parts.

DANGER
The perfect and safe operation of this switchgear is conditional on:
➭ Observance of operating and installation instructions.
➭ Qualified personnel.
➭ Proper transportation and correct storage of the switchgear.
➭ Correct installation and commissioning.
➭ Diligent operation and maintenance.
➭ Observance of the instructions applicable at site for installation, operation and safety.

4 Qualified personnel
Description of Qualified personnel in accordance with these operating instructions are persons
qualified personnel who are familiar with transport, installation, commissioning, maintenance and operation of
the product.
Medium-voltage switchgear type 8DB10 must be installed by certified personnel with
supervisor status.
To get the required certificate, the personnel must have taken part successfully in a training
for assembly and installation of Siemens gas-insulated medium-voltage switchgear type
8DB10 at the Siemens Switchgear Factory Frankfurt.
This installation training provides detailed information about transport, design, installation
and operation of 8DB10 medium-voltage switchgear. After successful participation,
the participants get a certificate signed by the trainer.

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 Safety instructions

The certificate becomes valid:

• After first installation of switchgear type 8DB10 under supervision of a certified senior
supervisor and his signature on the certificate, and
• after proof in form of an installation record for the Siemens Switchgear Factory
Frankfurt am Main.

After having been issued by the Siemens Switchgear Factory Frankfurt am Main, the
certificate is valid for three years. The owner of the certificate commits himself to prove his
received qualification by means of installation records, and to extend the certificate in due
time.
In case of important constructional modifications of the medium-voltage switchgear type
8DB10, the owner of the certificate is further obliged to participate in a refresher training to
extend the certificate.

Certified personnel Certified personnel in the sense of these operating instructions are persons who own a
valid installation certificate for medium-voltage switchgear type 8DB10.
Supervisor Supervisor in the sense of these operating instructions are persons who own a valid
installation certificate for medium-voltage switchgear type 8DB10, and who have
installed medium-voltage switchgear type 8DB10 at least once on their own. Moreover,
the supervisor is entitled to give instructions about the installation of the medium-
voltage switchgear 8DB10 to other personnel.
Senior Supervisor Senior supervisor in the sense of these operating instructions are persons who own a
valid installation certificate for medium-voltage switchgear 8DB10, and who have
installed medium-voltage switchgear type 8DB10 at least four times on their own.
The senior supervisor is further entitled to:
• Give instructions on the installation of the medium-voltage switchgear 8DB10 to
other personnel
• Sign an installation certificate in order to confirm its validity

Certificate

Fig. 3: Example for a certificate

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Description

Description
5 Features
Typical uses Extendable fixed-mounted circuit-breaker switchgear of the 8DB10 series is mainly used in
transformer and distribution substations as well as for switching duties in industrial plants.
The panels are designed for rated voltages up to 40.5 kV and rated currents up to 2500 A. In
distribution systems up to 40.5 kV, a maximum short-circuit current of 40 kA is permissible.

Insulating gas SF6 Sulfur hexafluoride SF6 is used as insulating gas. SF6 insulates live parts against
the housing wall.
When several switchgear sections have to be delivered, the switchgear is delivered ex works
partly with SF6 filling ready for service. To fill all gas compartments completely with SF6,
SF6 gas and a filling device must be provided on site. If the switchgear is delivered as one
switchgear section (possible for switchgear assemblies comprising up to 4 panels),
the switchgear is delivered ex works completely with SF6 filling ready for service.
The SF6 filling is provided to last the total service life of the switchgear.

Filling quantity as per rating plate.

Technology • Factory-assembled, type-tested and metal-enclosed switchgear for indoor installation

• Double busbar
• Single-pole metal enclosure

Personal safety • Safe-to-touch connection and interconnection system for cables as well as for solid-
insulated and gas-insulated bars
• Complete switchgear interlocking system with logical mechanical interlocks

Security of operation and • Minimum fire load

availability • Primary part independent of environmental effects (pollution, humidity and small animals)
due to hermetically sealed enclosure

Cost-efficiency • Maintenance-free under normal ambient conditions according to IEC 62271-1 and
VDE 0671-1

National approvals 8DB10 switchgear has obtained the following national approval:
• GOST R certificate

Seismic withstand 8DB10 switchgear can be upgraded for operation in regions at risk from earthquakes,
capability (option) see the relevant order and delivery documents.

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 Description

6 Panel types

Circuit-breaker panel CB Bus coupler BC Metering panel ME Cable connection panel CP

Bus sectionalizer BS up to 2500 A Bus sectionalizer (2 panels) BS Bus sectionalizer (2 panels) BS Dummy panel
BB1 BB2

Vacuum circuit-breaker Plug-in voltage transformer Three-position disconnector

Plug-in cable (not included in These components are

Capacitive voltage detecting system ------
the scope of supply) optionally selectable

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Description

7 Examples for panel versions

Circuit-breaker panel up to 2500 A

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for three-position disconnector housing in system 2
④ Gas pressure manometer for circuit-breaker housing
⑤ Gas filling valve
⑥ Gas pressure manometer for three-position disconnector housing in system 1
⑦ Operating mechanism of three-position disconnector
⑧ Circuit-breaker operating mechanism
⑨ Capacitive voltage detecting system
⑩ Busbar housing
⑪ Busbars
⑫ Gas pipe
⑬ Switchpanel pole housing with vacuum interrupter
⑭ 4MC4 current transformer
⑮ Panel connection housing with inside-cone bushings for cable plugs, voltage transformers and
surge arresters, or for connection of bar systems

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 Description

Bus coupler

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for three-position disconnector housing in system 2
④ Gas pressure manometer for circuit-breaker housing
⑤ Gas filling valve
⑥ Gas pressure manometer for three-position disconnector housing in system 1
⑦ Operating mechanism of three-position disconnector
⑧ Circuit-breaker operating mechanism
⑨ Capacitive voltage detecting system
⑩ Busbar housing
⑪ Busbars
⑫ Gas pipe
⑬ Switchpanel pole housing
⑭ Coupling housing

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Description

Bus sectionalizer BS up to 2500 A (busbar system 1 and 2)

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for three-position disconnector housing in system 2
④ Gas pressure manometer for circuit-breaker housing
⑤ Gas filling valve
⑥ Gas pressure manometer for three-position disconnector housing in system 1
⑦ Operating mechanism of three-position disconnector
⑧ Circuit-breaker operating mechanism
⑨ Capacitive voltage detecting system
⑩ Busbar housing
⑪ Busbars
⑫ Gas pipe
⑬ Bus riser housing
⑭ 4MC4 current transformer
⑮ Bus sectionalizer

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 Description

Metering panel

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for three-position disconnector housing in system 2
④ Gas filling valve
⑤ Gas pressure manometer for three-position disconnector housing in system 1
⑥ Operating mechanism of three-position disconnector
⑦ Dummy cover for circuit-breaker operating mechanism
⑧ Busbar housing
⑨ Busbars
⑩ Gas pipe
⑪ Housing
⑫ Voltage transformer

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Description

Cable connection panel up to 2500 A

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for switchpanel pole housing in system 2
④ Gas filling valve
⑤ Gas pressure manometer for switchpanel pole housing in system 1
⑥ Dummy cover for circuit-breaker operating mechanism
⑦ Capacitive voltage detecting system
⑧ Busbar housing
⑨ Busbars
⑩ Gas pipe
⑪ Switchpanel pole housing
⑫ Panel connection housing with inside-cone bushings for cable plugs, voltage transformers and
surge arresters, or for connection of bar systems

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 Description

Dummy panel

① Low-voltage compartment (standard heights: 850/1200 mm)

② Busbar housing
③ Busbars

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Description

Bus sectionalizer (2 panels) BS BB1

① Low-voltage compartment (standard heights: 850/1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for switchpanel pole housing
④ Gas filling valve
⑤ Gas pressure manometer for three-position disconnector housing in system 1
⑥ Cover of operating mechanism for three-position disconnector
⑦ Dummy cover for circuit-breaker operating mechanism
⑧ Capacitive voltage detecting system
⑨ Busbar housing
⑩ Busbars
⑪ Gas pipe
⑫ Bus riser housing
⑬ 4MC4 current transformer
⑭ Bus sectionalizer

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 Description

Circuit-breaker panel with 5000 A busbar

① Low-voltage compartment (standard height: 1200 mm)

② SIPROTEC bay controller (option)
③ Gas pressure manometer for three-position disconnector housing in system 2
④ Gas pressure manometer for circuit-breaker housing
⑤ Gas filling valve
⑥ Gas pressure manometer for three-position disconnector housing in system 1
⑦ Operating mechanism of three-position disconnector
⑧ Circuit-breaker operating mechanism
⑨ Capacitive voltage detecting system
⑩ Busbar housing, upper busbar system
⑪ Busbars, upper busbar system
⑫ Busbar housing, lower busbar system
⑬ Busbars, lower busbar system
⑭ Gas pipe
⑮ Switchpanel pole housing with vacuum interrupter
⑯ 4MC4 current transformer
⑰ Panel connection housing with inside-cone bushings for cable plugs, voltage transformers and
surge arresters, or for connection of bar systems

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Description

8 Panel design

8.1 Function
The circuit-breaker panel is the basic panel type of the 8DB10. The circuit-breaker panel can
fulfil the function "incoming feeder" or "outgoing feeder". It can carry or switch all rated
busbar and feeder currents as well as the short-circuit currents quoted on the respective rating
plates.

8.2 Subframe
• Support for switchpanel poles and panel front
• Forms the cable compartment
• Subframe versions
- Standard: Switchgear height 2350 mm
- Higher version: Switchgear height 2570 mm

8.3 Low-voltage compartment

• For accommodation of protection, control, measuring and metering equipment
• With plug-in cables of the circuit-breaker and three-position disconnector operating
mechanisms on top-hat rail for incoming and outgoing cables (e.g. bus wires)
• Devices can be optionally mounted in the door or on top-hat rail inside the low-voltage
compartment
• Height of low-voltage compartment, optionally 850 mm (standard) or 1200 mm

8.4 Switchpanel pole

• Poles arranged one behind the other.
One switchpanel pole consists of a vertically arranged housing with a vacuum interrupter
inside.
Over the switchpanel pole, there are the disconnector housings for busbar system 1 and 2,
and above these the respective busbar housings in horizontal arrangement.

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 Description

8.5 Switchgear panel

Fig. 4: 8DB10 circuit-breaker panel

① Low-voltage compartment (standard heights: 850/1200 mm)
② SIPROTEC bay controller (option)
③ Gas pressure manometer for circuit-breaker housing
④ Gas filling valve
⑤ Gas pressure manometer for three-position disconnector housing in system 1
⑥ Control and indication board for three-position disconnector with position indicator for circuit-breaker
⑦ Gas pressure manometer for three-position disconnector housing in system 2
⑧ Control and indication board for vacuum circuit-breaker
⑨ Capacitive voltage detecting system
⑩ Cable compartment
⑪ Frame

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Description

9 Circuit-breaker

9.1 Design
The vacuum circuit-breaker is an integral part of the switchgear panel and consists of the
following components:
• Operating mechanism with stored-energy spring mechanism and control elements (3AH49)
• Operating linkage for contact operation
• 3 switchpanel poles with vacuum interrupters

Mechanical interlocking The circuit-breaker and the three-position disconnector are mechanically interlocked against
each other. During manual operation, the mechanical interlock prevents the circuit-breaker
from being closed as long as the three-position disconnector is not in a defined end position
(CLOSED/OPEN/EARTHED). Furthermore, the mechanical interlock prevents the three-position
disconnector from being operated while the circuit-breaker is closed.
Vacuum interrupters
① Moving contact
② Metal bellows
③ Fixed contact

Fig. 5: Sectional view of

a vacuum interrupter

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 Description

9.2 Operating mechanism box

Design The operating mechanism box is closed with a front plate. The front plate contains openings
for the control elements and indicators. The operating mechanism box accommodates all
components required to operate the circuit-breaker.

① Auxiliary switch (-S1)

② ON pushbutton
③ Closing solenoid (-Y9)
④ 1st shunt release (-Y1)
⑤ OFF pushbutton
⑥ Undervoltage release (-Y7)
⑦ Operating shaft for circuit-breaker
⑧ Opening spring
⑨ Operations counter
⑩ Position indicator for circuit-breaker
⑪ "Closing spring charged / not charged" indicator
⑫ Position switch
⑬ Closing spring
⑭ Gear with hand crank coupling
⑮ Rating plate
Fig. 6: Circuit-breaker operating mechanism without front plate

Function Depending on its design, the circuit-breaker is closed electrically or mechanically with the ON
pushbutton. The operating power is transmitted to the vacuum interrupters through an
operating linkage. The closing spring is immediately recharged by the motor after closing.
If the motor supply voltage fails, the closing spring can be charged manually. To do this, there
is an opening in the removable front plate with the hand crank coupling of the gear behind.
The charging condition of the spring can be read on the indicator.

9.3 Equipment

Basic equipment The basic version of the vacuum circuit-breaker is equipped as follows:
• Electrical operating mechanism (charging motor) with mechanical and electrical anti-
pumping device (M1)
• Closing solenoid (Y9)
• 1st shunt release (Y1)
• Low-voltage plug connector with 10-pole wiring (Q0)
• Auxiliary switch, max. 2NO + 2NC + 2 changeover freely available (S1)
• Position switch for "closing spring charged" indication (S41, S42)
• Circuit-breaker tripping signal, cutout switches (S6, S7)
• Operations counter
• Feeder locking device

Additional equipment • Extended auxiliary switch, max. 12NO + 12NC + 2 changeover freely available (S1)
• Shunt release (Y2)
• Undervoltage release (Y7)
• Interlocking between feeder locking device and three-position disconnector (circuit-breaker
only lockable in earthed position)

Possible release
combinations Release Type Release combination

1 2 3 4
1st shunt release 3AY15 10 X X X X
2nd shunt release 3AX1101 --- X --- X
Undervoltage release 3AX1103 --- --- X X

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Description

10 Disconnector and three-position disconnector

Function of three-position Busbar system 1 is equipped with a the three-position disconnector which combines the
disconnector functions of a disconnector and an earthing switch. It is designed for no-load operation only.

Function of disconnector A disconnector is installed in busbar system 2. It is designed for no-load operation only.
The disconnector has a work-in-progress earthing contact for maintenance work,
which cannot be operated during normal operation.

ATTENTION
The work-in-progress earthing contact of the disconnector in busbar system 2 is designed for
maintenance work at the three-position disconnector in busbar system 1 in de-energized
condition only.
➭ Before switching to the work-in-progress earthing contact, always contact your regional
Siemens representative.

① Fixed contact of busbar,

busbar system 1
② Fixed contact of busbar,
busbar system 2
③ Work-in-progress earthing contact
for system 2
④ Moving contact for
system 2 in OPEN position
⑤ Bushing
⑥ Fixed contact for
READY-TO-EARTH, system 1
⑦ Moving contact for
system 1 in OPEN position

Fig. 7: 8DB three-position disconnector for busbar

system 1 and three-position disconnector
for busbar system 2

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Switch positions
Switch positions Position indicator Basic scheme

Three-position disconnector (system 1) in OPEN position

Three-position disconnector (system 2) in OPEN position

Three-position disconnector (system 1) in CLOSED position

Three-position disconnector (system 2) in OPEN position

Three-position disconnector (system 1)

in READY-TO-EARTH position
Three-position disconnector (system 2) in OPEN position

Three-position disconnector (system 1) in OPEN position

Three-position disconnector (system 2) in CLOSED position

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Description

Operating mechanism for three-position disconnector

The three-position disconnector is operated from the switchgear front.
• Auxiliary switch
- Each operating mechanism is equipped with an auxiliary switch for the position indication.

• Motor operating mechanism

- Remote operation (standard) applied to terminal
- Local operation (option)
- Manual operation possible by operating lever

• Wiring
- Auxiliary switches and motor operating mechanisms are wired to terminal strips in
the low-voltage compartment.

Interlocks for the three-position disconnector (option)

• The three-position switch is equipped with a mechanical interlock. This interlock prevents
the circuit-breaker from being closed while the three-position switch is being operated.
Furthermore the mechanical interlock prevents the possibility of operating the three-
position switch while the circuit-breaker is closed.
• With single-busbar systems, the control gate can only be operated if the interrogation lever
is pushed downwards. Thus, the corresponding operating shafts are only released at
the operating front after actuation of the interrogation lever.
• The control gate of the switching gate of the three-position switch can be padlocked in
three switch positions.

Fig. 8: Disconnecting function is blocked

Fig. 9: Earthing function is blocked

Fig. 10: Disconnecting and earthing functions are blocked (common function)

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11 Make-proof busbar earthing switch

Fig. 11: Overview of busbar component: Busbar earthing switch

① Low-voltage compartment
② SIPROTEC bay controller (option)
③ Gas pressure manometer for circuit-breaker housing
④ Gas filling valve
⑤ Gas pressure manometer for three-position disconnector housing in system 1
⑥ Operating mechanism of three-position disconnector
⑦ Gas pressure manometer for three-position disconnector housing in system 2
⑧ Circuit-breaker operating mechanism
⑨ Capacitive voltage detecting system
⑩ Housing for busbar earthing switch
⑪ Operating unit
⑫ Busbars
⑬ Busbar housing
⑭ Gas pipe
⑮ Switchpanel pole housing with vacuum interrupter
⑯ 4MC4 current transformer
⑰ Panel connection housing with inside-cone bushings for cable plugs, voltage transformers and
surge arresters, or for connection of bar systems

The busbar earthing switch is pre-assembled at the factory.

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Description

12 Current and voltage transformers

12.1 Voltage transformers

Features • According to IEC 60044-2

• Cast-resin insulated
• Inductive type
• Safe-to-touch due to metal enclosure

Fig. 12: Voltage transformer installation (basic scheme)

① Busbar voltage transformer 4MT3 ③ Voltage transformer 4MU4 with
three-position disconnector
② Feeder voltage transformer 4MT7 ④ Feeder voltage transformer 4MU3 (not in
(connection at panel connection housing) the panel, connection via flexible cable with plug
size S2 at the panel connection housing, and
metal-enclosed voltage transformer)

Voltage transformer types

Mounting locations Type Comment
Busbar 4MT3 optionally with three-position disconnector
4MU4
Panel connection 4MU3 external
4MT7 directly pluggable

Electrical data
Designation 4MT3 4MU4 4MT7 4MU3
Operating voltage kV 3.3 to 23.0 24.0 to 38.0 3.3 to 38.0 3.3 to 38.0
Rated voltage kV 24.0 40.5 40.5 40.5
Rated short-duration power-frequency 65.0 95.0 95.0 95.0
withstand voltage kV
Rated lightning impulse withstand voltage kV 125.0 200.0 200.0 200.0
Rated voltage factor Un / 8h = 1.9 Un / 8h = 1.9 Un / 8h = 1.9 Un / 8h = 1.9
Un / continuous = 1.2 Un / continuous = 1.2 Un / continuous = 1.2 Un / continuous = 1.2
Standard IEC IEC IEC IEC
GOST GOST GOST GOST
GB GB GB GB

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12.2 Current transformers

Features • According to IEC 60044-1
• Designed as ring-core current transformers:
- Ring core as carrier of secondary winding
- Main circuit corresponds to primary winding
• Arranged outside the primary enclosure (switchgear vessel) due to single-pole design
of the panel
• Free of dielectrically stressed cast-resin parts
Mounting locations • On the busbar
• On the circuit-breaker housing
• On the panel connection
• On the cable

Fig. 13: Current transformer installation (basic scheme)

① Busbar current transformer (type 4MC4_40) ③ Feeder current transformer (type 4MC4_40)
② Feeder current transformer (type 4MC4_90) ④ Feeder current transformer (type 4MC4_10)

Electrical data
Designation Type 4MC4
Operating voltage max. 800 V
Rated short-duration power- frequency withstand voltage 3 kV
(winding test)
Rated frequency 50/60 Hz
Rated continuous thermal current max. 1.2 x rated current (primary)
Rated thermal short-time current, max. 3 s max. 40 kA
Rated current dynamic unlimited
primary 40 A to 2500 A
secondary 1 A And 5 A
Multiratio (secondary) 200 A - 100 A to 2500 A - 1250 A
Core data according to rated primary current max. 3 cores
Measuring core Rating 2.5 VA to 30 VA
Class 0.2 to 1
Overcurrent factor FS 5, FS 10
Protection core Rating 2.5 VA to 30 VA
Class 5 P or 10 P
Overcurrent factor 10 to 30
Permissible ambient air temperature max. 60 °C
Insulation class E

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Description

13 Gas compartments
Function The distribution of the gas compartments is decisive for working on the switchgear during
operation and the resulting operational restrictions. Thus, in case of fault, the distribution of
the gas compartments determines the extent of work.
The following example shows the distribution of the gas compartments in a switchgear with
double busbar system with the associated item designations of the manometers. For more
detailed data to other configurations, please contact your regional Siemens representative.

① Busbar system 1, phase L1 (manometer B11)

② Busbar system 1, phase L2 (manometer B12)
③ Busbar system 1, phase L3 (manometer B13)
④ Busbar system 2, phase L1 (manometer B21)
⑤ Busbar system 2, phase L2 (manometer B22)
⑥ Busbar system 2, phase L3 (manometer B23)
⑦ Three-position disconnector, busbar system 1, phases L1, L2, L3
(manometer B1)
⑧ Disconnector, busbar system 2, phases L1, L2, L3 (manometer B2)
⑨ Circuit-breaker, phases L1, L2, L3 (manometer B0)
⑩ Top-mounted bus sectionalizer, busbar system 1, phases L1, L2, L3
(manometer B16)
⑪ Top-mounted bus sectionalizer, busbar system 2, phases L1, L2, L3
(manometer B26)

Fig. 14: Gas compartment distribution in

a double-busbar panel 8DB10

Fig. 15: Gas compartment distribution in 8DB10 switchgear with double-busbar panels

Bushings
Symbol Adhesive label

Gas-tight bushing

Bushing pervious to gas

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Gas quantities 8DB10 The gas quantities of 8DB10 are determined in accordance with the project, and are indicated
on the rating plates of the switchgear panels.

Examples for typicals 70 kPa 120 kPa

(all data for three-phase operation) Gas quantity in kg Gas quantity in kg
(feeder and busbar)* (feeder and busbar)*
Circuit-breaker panel 1250 A 4.5 5.0
1x panel connection S2
Circuit-breaker panel 1250 A 5.2 5.7
3x panel connection S3
Circuit-breaker panel 1250 A 6.4 6.9
4x panel connection S3
Circuit-breaker panel 2500 A - 6.9
4x panel connection S3
Bus sectionalizer 1250 A (2 panels) 13.6 14.4
Bus sectionalizer 2500 A (2 panels) - 14.4
Bus coupler 2500 A - 7.5
* Values according to technical data, see page 44, "Insulating gas SF6"

Examples for busbar shares 70 kPa 120 kPa

Gas quantity in kg* Gas quantity in kg*
Busbar 2500 A, left end panel 1.8 2.2
Busbar 2500 A, right end panel 1.4 1.8
Busbar 2500 A, intermediate panel 1.8 2.2
* Values according to technical data, see page 44, "Insulating gas SF6"

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Description

14 Panel connection

14.1 Features
• Bushings for plugs with inside-cone plug-in system according to EN 50181
• Single and multiple connections possible per phase
• Conection of several cables with different plug sizes possible per phase
• Connection of solid-insulated or gas-insulated bar possible
• Connection of 4MT7 voltage transformer plugged in at the panel connection housing
version 3
• Connection of 4MU3 voltage transformer via flexible cable and plug size 2 at
the panel connection housing
• For rated normal currents up to 2500 A

14.2 Panel connection versions for cable plugs

Selection table Cable plugs, inside cone
Plug size 2 3 4
Rated normal current (A) 800 1250 2500
Rated lightning impulse withstand voltage (kV) 200 200 200
Rated short-duration power-frequency withstand voltage (kV) 95 95 95
Min. cross-section (mm2) 25 50 95
Min. core diameter (mm) 4.9 7.2 9.3
Max. cross-section (mm 2) 325 800 1200
Max. core diameter (mm) 22.3 34.6 45.4
Min. diameter across insulation (mm) 13.5 15.5 33
Max. diameter across insulation (mm) 40.0 51.0 66.0

Examples: Panel
connection versions

Version 1 Version 2 Version 3

S2 S3 S2 S3 4MT7 Solid-insulated
busbar connection
1 1 1 1 - -
2 - - -
3 - - -
- 2 - -
- 3 - -
1 2 - -
1 - 1 -
2 - 1 -
- 1 1 -
1 1 1 -
- - 1 1
1 - - 1
2 1 - -

Legend: ① Panel connection housing

② Subframe

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Version 4 Version 5 Version 6 Version 7

S2 S3 Solid-insulated S2 S3 S4 Solid-insulated busbar connection Gas-insulated busbar connection
busbar connection
4 - - - - 1 1 1
5 - - 1 - 1
6 - - 2 - 1
- 4 - - 1 1
1 3 - 1 1 1
1 4 - - - 2
2 2 - - 2 1
2 3 -
3 1 -
3 2 -
4 1 -
2 - 1
- 1 1
- 2 1
1 1 1

Legend: ① Panel connection housing

② Subframe

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15 Voltage detecting systems

For voltage detection according to IEC 61243-5 and VDE 0682 Part 415 with the following
voltage detecting systems:
• LRM plug-in sockets
• VOIS+, VOIS R+ (option)
• CAPDIS -S1/-S2+ (option)
• WEGA 1.2/2.2 (option)

① VOIS, WEGA, CAPDIS-S1+/S2+

fixed-mounted
② LRM indicator plugged in

Fig. 16: Voltage detecting system via

capacitive voltage divider (principle)

• -C1: Capacitance integrated into bushing

• -C2: Capacitance of the connection leads and the voltage indicator to earth
• ULE=UN/ √ 3 during rated operation in the three-phase system
• U2=UA=Voltage at the capacitive interface of the switchgear or at the voltage indicator

LRM system

Fig. 17: Verification of safe isolation from supply (LRM system)

Features of • Verification of safe isolation from supply phase by phase through insertion of the voltage
LRM plug-in sockets indicator in the corresponding plug-in sockets
• Voltage indicator suitable for continuous operation
• Safe-to-touch
• Routine-tested
• Measuring system and voltage indicator can be tested
• Voltage indicator flashes if high voltage is present
• Fixed-mounted capacitive voltage dividers in the bushings
The marking for documentation of the repeat test of the interface condition is located next to
the LRM plug-in sockets:

Fig. 18: Documentation to repeat test of interface condition

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VOIS+, VOIS R+

Fig. 19: Voltage indicator type VOIS+

Features of • Integrated display, without auxiliary power

VOIS+, VOIS R+ • With indication "A1" to "A3" (see page 177, "Indications VOIS, VOIS R+, CAPDIS -S1+/-S2+")
• Maintenance-free, repeat test required
• With integrated 3-phase test socket for phase comparison
(also suitable for plug-in voltage indicator)
• Degree of protection IP 54, temperature range -25 °C to +55°C
• With integrated signaling relays (only VOIS R+)
• "M1": Operating voltage present at one phase L1, L2 or L3 as a minimum
• "M2": Operating voltage not present at L1, L2 and L3

CAPDIS-S1+/S2+

Fig. 20: Voltage indicator type CAPDIS-S2+ (option)

Common features of • Maintenance-free

CAPDIS -S1+/-S2+ • Integrated display, without auxiliary power
• Integrated repeat test of the interfaces (self-monitoring)
• With integrated function test (without auxiliary power) by pressing the "Test" button
• Adjustable to different operating voltage ranges
• With integrated 3-phase test socket for phase comparison
(also suitable for plug-in voltage indicator)
• Degree of protection IP 54, temperature range –25 °C to +55 °C
• With signal-lead test
• With overvoltage monitoring and signaling at 1.2 times operating voltage

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Description

DANGER
High voltage! Danger! Do only modify the factory setting of the C2 module in the voltage
detecting system CAPDIS-S1+/S2+ after consultation with the regional Siemens representative!
➭ If the setting of the C2 module was modified by mistake, re-establish the factory setting as
follows:
- Pull out the C2 module ③ at the rear side of CAPDIS-S1+/S2+. Caution: Open printed
circuit board may be energized.
- Plug the C2 module ③ into CAPDIS-S1+/S2+ so that the marked arrow ① on the housing
points to the marking ② on the C2 module

Fig. 21: Marking of the factory setting at the C2 module

Features of CAPDIS-S1+ • Without auxiliary power

• With indication "A1" to "A7" (see page 177, "Indications VOIS, VOIS R+, CAPDIS -S1+/-S2+")
• Without ready-for-service monitoring
• Without signaling relay (thus without auxiliary contacts)

Features of CAPDIS-S2+ • With indication "A0" to "A8" (see page 177, "Indications VOIS, VOIS R+, CAPDIS -S1+/-S2+")
• Only by pressing the "Test" pushbutton: "ERROR" indication (A8), e.g., in case of missing
auxiliary voltage
• With ready-for-service monitoring (external auxiliary power required)
• With integrated signaling relays for signals "M1" to ”M4” (auxiliary power required):
- "M1": Voltage present at phases L1, L2, L3
- "M2": Voltage not present at L1, L2 and L3 (= active zero indication)
- "M3": Earth fault or voltage failure, e.g., in one phase
- "M4": External auxiliary power missing (with operating voltage present or not)

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WEGA 1.2

Fig. 22: Voltage indicator type WEGA 1.2

Features of WEGA 1.2 • With indication "A1" to "A5" (see page 179, "Indications WEGA 1.2, WEGA 2.2")
• Maintenance-free
• Integrated repeat test of the interface (self-monitoring)
• With integrated function test (without auxiliary power) by pressing the "Display Test" button
• With integrated 3-phase LRM test socket for phase comparison
• Degree of protection IP 54, temperature range –25 °C to +55 °C
• Without integrated signaling relay
• Without auxiliary power

WEGA 2.2

Fig. 23: Voltage indicator type WEGA 2.2

Features of WEGA 2.2 • With indication "A0" to "A6" (see page 179, "Indications WEGA 1.2, WEGA 2.2")
• Maintenance-free
• Integrated repeat test of the interface (self-monitoring)
• With integrated function test (without auxiliary power) by pressing the "Display Test" button
• With integrated 3-phase LRM test socket for phase comparison
• Degree of protection IP 54, temperature range –25 °C to +55 °C
• With integrated signaling relay
• Auxiliary power required

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16 Aseismic design (option)

Additional components for seismic design are pre-assembled at the factory.

Fig. 24: Aseismic panel design (reinforced side plate ① )

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17 Accessories

17.1 Standard accessories

• Operating and installation instructions
• Operating lever for three-position disconnector: DISCONNECTING function

• Operating lever for three-position disconnector: EARTHING or READY-TO-EARTH function

• Hand crank for charging the circuit-breaker closing spring

• Double-bit key with a diameter of 3 mm (for door of low-voltage compartment)

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Description

17.2 Other accessories

According to the order documents/purchase order (selection):
• Voltage detecting system (e.g. plug-in voltage indicator)
• Voltage indicators for LRM systems, pluggable (e.g. make Horstmann)

• Adapter for emergency operation of the three-position operating mechanism (to be used
only with motor operating mechanism)

• Operating lever for the make-proof busbar earthing switch

• Torx screwdriver

• Test units to check the capacitive interface and the voltage indicators

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• Phase comparison test units (e.g. make Pfisterer, type EPV)

Accessories box in the switchgear end wall to store the accessories.

Fig. 25: Accessories box in the switchgear end wall (open)

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Description

18 Technical data

18.1 Electrical data

Complete switchgear
Rated
voltage kV 12 24 36 40.5
frequency Hz 50/60
General Rated short-duration kV 28 50 70 85
power-frequency
withstand voltage
Rated lightning impulse kV 75 125 170 185
withstand voltage
Disconnector Rated short-duration kV 32 60 80 90
power-frequency
withstand voltage
Rated lightning impulse kV 85 145 195 220
withstand voltage
short-circuit breaking current, max. kA 40
short-time withstand current 3s, max. kA 40
short-circuit making current, max. kA 104
peak withstand current, max. kA 104
normal current of busbar, max. A 5000
normal current of feeders, max. A 2500

18.2 Vacuum circuit-breaker

Operating times
Closing time Closing solenoid <95 ms
Opening time 1st shunt release <65 ms
2nd shunt release <55 ms
Undervoltage release <55 ms
Arcing time at 50 Hz <15 ms
at 60 Hz <12 ms
Break time 1st shunt release <80 ms
at 50 Hz 2nd shunt release <70 ms
Undervoltage release <70 ms
Dead time 300 ms
Total charging time <15 s

Number of
operating cycles Rated normal current 10000 operating cycles
30000 operating cycles (option)
Short-circuit breaking current 50 operating cycles

Closing time The interval of time between the initiation (command) of the closing operation and
the instant when the contacts touch in all poles.

Opening time The interval of time between the initiation (command) of the opening operation and
the instant when the contacts separate in all poles.

Arcing time The interval of time from the first initiation of an arc and the instant of final arc extinction in
all poles.

Break time The interval of time between the initiation (command) of the opening operation and the
instant of final arc extinction in the last-pole-to-clear (= opening time and arcing time).

Close-open contact time The interval of time - in a make-break operating cycle - between the instant when the contacts
touch in the first pole in the closing process, and the instant when the contacts separate in all
poles in the subsequent opening process.

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Motor operating The operating mechanisms of the 3AH49 vacuum circuit-breakers are suitable for auto-
mechanism reclosing. For DC operation, the maximum power consumption is approx. 500 W.
For AC operation, the maximum power consumption is approx. 650 VA.
The rated current of the motor protection equipment is shown in the following table:

Rated supply voltage [V] Recommended rated current for the protection
equipment* [A]
DC 24 8
DC 48 6
DC 60 4
DC/AC 110 2
50/60 Hz
DC 220 / AC 230 1,6
50/60 Hz
*)
M.c.b. with C-characteristic

The supply voltage may deviate from the rated supply voltage specified in the table
by -15 % to +10 %.
The breaking capacity of the auxiliary switch 3SV92 is shown on the following table:

Breaking capacity Operating voltage [V] Normal current [A]

ac 40 to 60 Hz up to 230 10
Resistive load Inductive load
dc 24 10 10
48 10 9
60 9 7
110 5 4
220 2,5 2

Closing solenoid (Y9) The closing solenoid 3AY1510 closes the circuit-breaker. After completion of a closing
operation, the closing solenoid is de-energized internally. It is available for ac or dc voltage.
Power consumption: 140 W or 140 VA.

Shunt release Shunt releases are used for automatic or deliberate tripping of circuit-breakers. They are
designed for connection to external voltage (dc or ac voltage). They can also be connected to
a voltage transformer for deliberate tripping.
Shunt releases based on two different principles are used:
• The shunt release (Y1) 3AY15 10 is used as standard in the basic circuit-breaker version.
With this design, the circuit-breaker is opened electrically.
Power consumption: 140 W or 140 VA.
• The shunt release (Y2) 3AY11 01 with energy store is fitted if more than one shunt release
is required. With this design, the electrical opening command is transferred magnetically
and thus, the circuit-breaker is opened. Power consumption: 70 W or 50 VA.

Undervoltage release Undervoltage releases (Y7) 3AX1103 are tripped automatically through an electromagnet or
deliberately. The deliberate tripping of the undervoltage release generally takes place via an
NC contact in the tripping circuit or via an NO contact by short-circuiting the magnet coil.
With this type of tripping, the short-circuit current is limited by the built-in resistors. Power
consumption: 20 W or 20 VA.

Circuit-breaker When the circuit-breaker is tripped by a release (e.g., by protection tripping) there is a signal
tripping signal through the NO contact -S6. If the circuit-breaker is tripped deliberately with the mechanical
pushbutton, this signal is suppressed by the NC contact -S7.

C.t-operated releases (Y6) The following c.t.-operated releases are available:

• The c.t.-operated release 3AX1102 consists of an energy store, an un latching mechanism
and an electromagnetic system. Rated tripping current: 0.5 A/1 A
• The c.t.-operated release 3AX1104 (low-energy release) is adequate for a tripping pulse of
≤ 0.1 Ws in connection with adequate protection systems. It is used if auxiliary voltage is
missing, tripping via protection relay.

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Integrated varistor
ATTENTION
Switching overvoltages can damage electronic control devices.
➭ Do not switch off inductive consumers in DC circuits.

With the varistor integrated in the motors, the inductances of the circuit-breaker operating
mechanism and the circuit-breaker control system can be operated with DC. The integrated
varistor limits the overvoltage to approx. 500 V and is available for all rated operating
voltages.

18.3 Insulating gas SF6

Sulphur hexafluoride SF6 according to IEC 60 376 is used as insulating gas. SF6 insulates live
parts between each other and against earth potential.

Features • Non-toxic
• Odorless
• Colorless
• Non-inflammable
• Chemically neutral
• Electronegative
• Heavier than air

Filling degree of 1.04 kg SF6 / liter cylinder volume (valid at a max. ambient air temperature of + 65 °C).
compressed gas cylinders

Vapor pressure over In the supplied cylinders, about 2/3 of the cylinder volume is liquid at + 20 °C, the rest is
liquid SF6 saturated SF6 vapor.

Vapor pressure as a
Temperature Vapor pressure
function of temperature
+ 20 °C 2100 kPa
+ 30 °C 2700 kPa
+ 65 °C 7000 kPa (test pressure of
cylinder)

Storage Store the cylinders in vertical position in a cool place.

Secure the cylinders against accidents.

Gas pressures
in kPa at 20°C Busbar housing
Rated busbar current [A] ≤ 2500, 5000 3150, 4000
Rated voltage [kV] ≤ 40.5
Rated lightning impulse withstand voltage ≤ 185 185 190 200 ≤ 190
[kV]
Rated short-duration power-frequency ≤ 85 95 85 80 ≤ 85
withstand voltage [kV]
Rated functional level [kPa] 70 120
Signal "critical functional level" 40 90
Min. functional level [kPa] 50 100
Signal "pressure too low" [kPa] 50 100
Max. functional level [kPa] 120 180
Signal "pressure too high" [kPa] 120 180

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Circuit-breaker/disconnector housing
Rated feeder current [A] * 1250 ≥ 1600 ≤ 2500
Rated voltage [kV] ≤ 36 40.5 36 38 40.5
Rated lightning impulse withstand voltage ≤ 170 185 190 200 200 200
[kV]
Rated short-duration power-frequency ≤ 50 65 / 70 ≤ 70 85 85 80 80 80
withstand voltage [kV]
Rated functional level [kPa] 70 120
Signal "critical functional level" 40 90
Min. functional level [kPa] 50 100
Signal "pressure too low" [kPa] 50 100
Max. functional level [kPa] 120 180
Signal "pressure too high" [kPa] 120 180

Characteristics of gas
① 120 kPa/20 °
pressure - temperature
② 70 kPa/20 °

Fig. 26: Characteristics of gas pressure as a function

of temperature

The characteristics of the gas pressures as a function of temperature show the behavior of
the SF6 gas at different gas filling levels depending on the ambient air temperature.

Due to the different configurations of the gas compartments, installed switchgear assemblies
may deviate from the above characteristics.

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Description

18.4 Classification of 8DB10 according to IEC 62 271-200

DANGER
Internal arc classification
➭ With internal arc classification IAC A FL, the area behind the switchgear is not tested
regarding the effects of internal faults. For this reason, access to this area must be
prevented during switchgear operation.
Protect the area behind the switchgear, e.g. by means of a barrier in form of a chain, a tape
or a beam.

Design and construction

Partition class PM (partition of metal)
Loss of service continuity category LSC 2
Accessibility to compartments Busbar compartment Tool-based
Switching-device compartment Tool-based
Low-voltage compartment Tool-based
Cable compartment Tool-based

Internal arc classification

Designation of the internal arc classification IAC
IAC class for
- Wall-standing IAC A FL 40 kA, 1 s
arrangement
- Free-standing IAC A FLR 40 kA, 1 s
arrangement
Type of accessibility A Switchgear in closed electrical service location
Access “for authorized personnel only“ according to IEC 62 271-200
-F Front
-L Lateral
-R Rear (for free-standing arrangement)
Rated short-time withstand current 40 kA
Rated duration of short circuit 1s

18.5 Standards, specifications, guidelines

Basic prescriptions and The fixed-mounted circuit-breaker switchgear 8DB10 for indoor installation complies with
standards the following prescriptions and standards:

IEC/EN standard VDE standard

Switchgear 62271-1 0671-1
62271-200 0671-200
Devices Circuit-breakers 62271-100 0671-100
Disconnectors/earthing switches 62271-102 0671-102
Voltage detecting systems 61243-5 0682-415
Surge arresters 60099 0675
Degree of IP code 60529 0470-1
protection IK code 62262 0470-100
Insulation 60071 0111
Instrument Current transformers 60044-1 0414-1
transformers Voltage transformers 60044-2 0414-2
Installation and earthing 61 936-1 / HD 637 -S1 0101
Insulating gas SF6 Use and handling 62271-4 0671-4
Specification for new SF6 60376 0373-1
Guidelines for the checking and 60480 0373-2
treatment of SF6 taken from electrical
equipment
Environmental conditions 60721-3-3 DIN EN 60 721-3-3

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Type approval according The vacuum interrupters fitted in the vacuum circuit-breakers are type-approved in
to German X-ray accordance with the X-ray regulations of the Federal Republic of Germany. They conform to
regulations (RöV) the requirements of the X-ray regulations of January 8, 1987 (Federal Law Gazette I 1987,
Page 114) in the new edition of April 30, 2003 (Federal Law Gazette I 2003, No. 17)
up to the value of the rated voltage stipulated in accordance with IEC/DIN VDE.

Electromagnetic The a.m. standards as well as the "EMC Guide for Switchgear"* are applied during design,
compatibility - EMC manufacture and erection of the switchgear. Installation, connection and maintenance have
to be performed in accordance with the stipulations of the operating instructions.
For operation, the legal stipulations applicable at the place of installation have to be observed
additionally. In this way, the switchgear assemblies of this type series fulfill the basic
protection requirements of the EMC guide.
The switchgear operator / owner must keep the technical documents supplied with
the switchgear throughout the entire service life, and keep them up-to-date in case of
modifications of the switchgear.
* (Dr. Bernd Jäkel, Ansgar Müller; Medium-Voltage Systems - EMC Guide for Switchgear;
A&D ATS SR/PTD M SP)

Protection against solid The fixed-mounted circuit-breaker switchgear of the series 8DB10 fulfills the following degrees
foreign objects, electric of protection according to IEC 60 529:
shock and water • IP65 standard for parts under high voltage
• IP3XD standard for external enclosure
• IP31D option standard for external enclosure

Transport regulations According to "Annex A of the European Agreement Concerning the International Carriage of
Dangerous Goods by Road (ADR)", Siemens gas-insulated medium-voltage switchgear does
not belong to the category of dangerous goods in respect of transportation, and is exempted
from special transport regulations according to ADR, Clause 1.1.3.1 b).

18.6 Phase sequence

L1 = Phase position 1
L2 = Phase position 2
L3 = Phase position 3
SS1 = Busbar system 1
SS2 = Busbar system 2

Fig. 27: Phase sequence in busbar compartment

18.7 Gas leakage rate

Gas leakage rate The gas leakage rate is < 0.1% per year (referred to the absolute gas pressure).

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Description

18.8 Rating plates

Switchgear panel The rating plate contains all information that is binding for the panel. It is provided on
the inside of the door of the low-voltage compartment of each panel.
If the circuit-breaker class is specified as M2*, a maximum of 30,000 mechanical operating
cycles are possible with the circuit-breaker.

① Switchgear type
② Serial number
③ Operating mechanism number
④ Year of manufacture
⑤ Panel number
⑥ Technical data
⑦ Internal arc classification
⑧ Pressure test mark of the SF6 gas vessel
⑨ Number of operating instructions
for the panel

Fig. 28: Rating plate of switchgear (example)

The IAC classification is referred to each panel. The data on the rating plate (see item ⑦ )
describes the areas classified for the corresponding panel.

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18.9 Overview of busbar covers

ATTENTION
If covers are removed from the switchgear assembly, please ensure that the correct cover type
is mounted again.
➭ If necessary, mark cover type.

NOTE
Mounting direction of post insulator cover
➭ The post insulator cover is marked with the designation "Front". The marking must always
point towards the front of the switchgear when the cover is mounted.
➭ Observe the mounting position of the post insulator cover.

Fig. 29: Standard cover Fig. 30: Desiccant cover

(rear view) (rear view)

Fig. 31: Post insulator cover Fig. 32: Post insulator cover with desiccant
(rear view) (rear view)

Fig. 33: Bursting disc Fig. 34: Bursting disc

(rear view) (front view)

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Installation
19 Constructional stipulations

19.1 Switchgear room

Please observe the following points while preparing the switchgear room:
• Base frame and switchgear dimensions
• Transport route to the switchgear room
• Distribution and intermediate storage spaces
• Size of the room and the doors
• Construction and load-bearing capacity of the floor
• Illumination, heating, power and water supply
• Dimensions of installation scaffoldings and foundation rails
• Installation of high-voltage cables
• Earthing system
• Cleanliness: Switchgear room free of dirt and dust

Floor openings The panels can be bolted or welded to the foundation rails. Fasten each panel diagonally to
the foundation rails at two points at least. Use M10 fixing bolts as a minimum.
Tightening torque: 60 Nm.

Dimensions of the
switchgear room ① ≥ 2850 mm 3)
② ≥ 800 mm
③ Area for floor openings for
control cables
④ 210 mm
⑤ ≥ 2185 mm 2)
⑥ Floor openings for high-voltage cables
⑦ ≥ 50 mm 1)

1) ≥ 500 mm for free-standing

arrangement. ≥ 800 mm for
free-standing arrangement and
operation from the rear.
2) For large panel connection housings
(versions 4 and 5) the dimension must
not be smaller than 2185 mm.
3)
I f there are any busbar components,
the minimum room height may have
to be higher.

Fig. 35: Room planning (data in mm)

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Room dimensions and

wall distances

Fig. 36: Wall-standing arrangement

Fig. 37: Free-standing arrangement

* Depending on national requirements

** Lateral wall distance ≥ 500 mm optionally required on the left or on the right
*** Lateral minimum wall distance ≥ 100 mm optionally possible on the left
or on the right

Load-bearing capacity
of the floor Load data and minimum distances
Constant loads Vertical single load 12 kN ****)
Not constant loads Live load 9 kN/m2
Minimum distances Control aisle 800 mm *)
Minimum lateral wall distance 100 mm **)
Lateral wall distance 500 mm ***)
Ceiling height 2900 mm
Minimum door opening Height 2700 mm ****)
Width 900 / 1900 mm *****)
*) Depending on national requirements.
**) Optionally possible on the left or on the right.
***) Optionally required on the left or on the right.
****) Without busbar components / height of low-voltage compartment 850 mm
*****) Individual panel without transport packing
(for group deliveries and bringing in with transport packing, see page 57, "Transport units "

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Construction of the floor The floor covering must be even, easy to clean, pressure-resistant, slip-resistant,
abrasion-resistant and electrically discharging.
As floor construction, the following is possible:
Steel girder layer
Suitable for large and numerous floor openings, and advantageous for later modifications or
extensions of the switchgear. The dimensions result from the constructional data of 8DB10
(see page 53, "Constructional data of the foundation").

Fig. 38: Frame construction with longitudinal girders

Fig. 39: Frame construction with longitudinal girders (cable basement)

Reinforced-concrete plate
Suitable for small room dimensions or spans, as well as for few and smaller floor openings.
Double floor
Suitable if neither a cable basement nor sufficient cable ducts can be installed; it consists of
removable, flame-retardant floor plates mounted on a supporting structure. The supporting
floor is about 60 to 100 cm lower depending on the cable routing (bending radius).

Earthing system • Provide suitable earthing system for the substation building (e.g., foundation earth
electrode, ring earth electrode, earth rod), and prepare the associated connection points
inside the substation building.
• Connect components brought into the substation building - such as metallic constructions,
floor reinforcement, doors, pressure relief systems, cable tracks, etc. - to the substation
earth, and earth them.
• Dimension the cross-sections of the earth electrodes sufficiently
(e.g., foundation earth electrode, ring earth electrode, earth rod).
• Always observe the associated national and international standards and
building regulations.

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Cable basement
ATTENTION
The cable basement must be sufficiently large to perform all work involved and to provide a
clear arrangement of the cables.
➭ The height and depth of the cable basement depends on the bending radii of the cables
used.

The cable basement must have the following characteristics:

• Dry
• Accessible at any time
• Sufficiently illuminated

19.2 Constructional data of the foundation

Floor openings and

fixing points

Fig. 40: Overview of floor openings and fixing points

① Base frame ⑤ Fixing holes (26x45) for M10
② Floor opening for high-voltage cables ⑥ Area for floor openings for control cables
③ Switchgear termination ⑦ Operating side of the panel
④ Foundation rails
2) For large panel connection housings, the dimension must not be smaller than 2185 mm

Stipulations for The standard design must be bolted diagonally to the foundation rails at two points (use sheet
the bolted joint of EN10021, 4x40x60 mm).
the standard design

Fig. 41: Bolted joints of standard design

① Fixing points (26x45 mm) for M10

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Stipulations for The aseismic design must be bolted to the foundation rails at all 4 points using a floor fixing
the bolted joint of profile. The floor fixing profile is included in the scope of supply. The fixing material is not
the aseismic design included in the scope of supply. (Part number: 865-2944.0 without fixing material).

Fig. 43: Fixing profile

Fig. 42: Bolted joints of the aseismic design
① Fixing points (26x45 mm) for M10 ② Fixing profile

Stipulations for the The standard design must be welded diagonally to the foundation rails at two points.
welded joint of the A floor fixing profile is not necessary.
standard design
The welding seams are conform to the strength of the equivalent bolted joint with M10 bolts.

Fig. 44: Welding seams of the standard version

① Fixing points (26x45 mm)

Stipulations for the The aseismic design must be welded to the foundation rails at all 4 points.
welded joint of the A floor fixing profile is not necessary.
aseismic design
The welding seams must conform to the strength of the equivalent bolted joint with
M10 bolts.

Fig. 45: Welding seams of the aseismic design

① Fixing points (26x45 mm)

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Siemens recommendation for the floor fixing

① Upper edge of finished floor

② Floor fixing plate (holder for profiles at a distance
≥ 1200 mm), see page 56, "Floor fixing plate"
③ C-profile CB 50 x 30, EN 10025, S235JR
④ • Hook-head bolt M16x35-4.6
• Washer R18, DIN 440/ISO 7094, S235JRG2C + L
• Hexagonal nut M16-8, DIN EN ISO 4032
⑤ Base frame of the switchgear
⑥ Min. 50 mm
⑦ Min. 90 mm
⑧ 80 mm
⑨ Raw floor
⑩ Expansion dowel with hexagonal bolt and washer,
FAN 12/10
⑪ Floor finish

Fig. 46: Screwed floor fixing

① Upper edge of finished floor

② Base frame of the switchgear
③ Welding in fixing opening of base frame
④ U-profile U80, DIN 1026
⑤ Floor fixing plate (holder for profiles at a distance
≥ 1200 mm), see page 56, "Floor fixing plate"
⑥ Min. 55 mm
⑦ Min. 90 mm
⑧ 80 mm
⑨ Raw floor
⑩ Expansion dowel with hexagonal bolt and washer,
FAN 12/10
⑪ Floor finish

Fig. 47: Welded floor fixing

① Upper edge of double floor

② • Hexagonal bolt M10-8, DIN 931/933
• Washer 10.5-St, EN ISO 7093-1
• Hexagonal nut M10-8, DIN EN ISO 4032
③ Base frame of the switchgear
④ Substructure
⑤ Supporting profile (e.g. profile 70 x 40 x 2)
⑥ Floor plate (approx. 36 mm thick)

Fig. 48: Fixing on double floor

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Installation

Floor fixing plate

The floor fixing plate is not part of the scope of supply of the Switchgear Factory Frankfurt.

Fig. 49: Floor fixing plate

① 90+2 mm ⑦ 30±1 mm
② 80+2 mm1) ⑧ Plate 80 x 5 x 160 mm, DIN 1017/EN 10025,
S235 JR, hot-dip galvanized
③ Plate 30 x 5 x 40 mm, DIN 1017/EN 10025, ⑨ 160±2 mm
S235 JR, hot-dip galvanized
④ 40±1 mm ⑩ 30 mm
⑤ 35±2 mm ⑪ 13 mm
⑥ 80±1.5 mm ⑫ 15 mm
1) 50 mm when using C-profile CB 50

NOTE
The welded seams are susceptible to corrosion.
➭ After welding, protect the welded seams professionally against corrosion.

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Foundation Please observe the following items when preparing the foundation:
• Dimensions of the floor opening and the fixing points of the switchgear frame
(see page 53, "Constructional data of the foundation").
• Determine level differences between the installation surfaces of the panels using
a measuring sheet, and compensate them with shims (0.5 - 1.0 mm).

Fig. 50: Measuring sheet for the foundation

The measuring sheet for the foundation shows: Evenness/straightness tolerance according to
DIN 4366: 1 mm for 1 m length, 2 mm for the total length.

Regulations and The switchgear can be used as indoor installation according to IEC 61 936 (Power Installations
standards referred to exceeding 1 kV AC) and VDE 0101
foundation and
• outside lockable electrical service locations at places which are not accessible to the public.
switchgear room
Enclosures of switchgear can only be removed with tools
• in lockable electrical service locations. A lockable electrical service location is a place
outdoors or indoors that is reserved exclusively for housing electrical equipment and
which is kept under lock and key. Access is restricted to authorized personnel and persons
who have been properly instructed in electrical engineering

For more information, see page 46, "Standards, specifications, guidelines".

19.3 Transport units

Dimensions
Panel widths Transport dimensions Transport weight with Transport weight
packing1) without packing 1)
mm Width x Height x Depth approx. kg approx. kg
mm x mm x mm
Transport inside Germany or to European countries
1 x 600 1816 x 2550 x 3124 1300 1200
2 x 600 1816 x 2550 x 3124 2600 2400
3 x 600 2416 x 2550 x 3124 3900 3600
Transport to overseas
1 x 600 1840 x 2850 x 3124 1300 1200
2 x 600 1840 x 2850 x 3124 2600 2400
3 x 600 2440 x 2850 x 3124 3900 3600
1)
Average values depending on the degree to which panels are equipped

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Center of gravity The position of the center of gravity can vary depending on the switchgear design.
In the following construction, the center of gravity is located at the marked position:

Fig. 51: Position of the center of gravity (depending on the switchgear version)

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20 Before installation

20.1 Preliminary clarifications

In order to load the transport units in a suitable installation order, the responsible Siemens
representative requires the following information from you several weeks before delivering the
switchgear:
• Sketch of the installation room including the locations and numbers of the individual panels
and the storage space for the accessories
• Sketch of the access route from the public road to the switchgear building and information
concerning the condition thereof (meadows, arable soil, sand, gravel, etc.)
• Sketch of the transport route inside the switchgear building with the locations and
dimensions of doors and other narrow points, as well as the floor number of the installation
room
• Information about available lifting equipment, e.g., mobile crane, fork-lift truck, lifting
truck, hydraulic jack, roller pads. If no lifting equipment is available, please notify
this explicitly.

20.2 Intermediate storage

DANGER
Risk of injury and damage to the stored goods if the storage surface is overloaded or the
transport units are stacked.
➭ Observe the load-bearing capacity of the floor.
➭ Do not stack the transport units.

DANGER
Fire risk!
➭ No smoking.
➭ Keep fire extinguishers in a weatherproof place.
➭ Mark the location of the fire extinguisher.

ATTENTION
Supplied desiccant bags lose their effectivemess if they are not stored in the undamaged
original packings.
➭ Do not damage or remove packing of desiccant bags.
➭ Do not unpack desiccant bags before use.

ATTENTION
The transport units may be damaged if they are stored outdoors without seaworthy packing
(seaworthy crate).
➭ Store transport units outdoors in seaworthy packing (seaworthy crate) only.

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If the comprehensive accessories, the delivered switchgear or parts thereof have to be stored
before installation, a suitable storage room or place has to be selected and prepared.
Intermediate storage of the transport units:
• In original packing as far as possible
• Observe the permissible storage temperature from -25° C to +70° C in accordance with
the installed secondary devices. In the individual case, the electronic components must be
checked regarding the permissible limit temperature and the relevant temperatures for
the application.
• In a weatherproof place
• Protected against damage
• Store transport units in such a way that they can be taken out later in the correct order
for installation.

Storage in closed rooms The following switchgear parts must be stored in closed rooms:
• Unpacked parts
• Transport units which are not packed in seaworthy crates

The storage room must have the following characteristics:

• Well-ventilated
• Free of dust
• Dry and protected against flooding
• Relative humidity should not exceed 50%
• Protected against vermin (e.g., insects, mice, rats)
• Even floor to enable stable storage
• Floor with adequate load-bearing capacity
• Sufficient size to enable clearly arranged storage

➭ Do not unpack small parts to avoid corrosion and loss.

➭ Store transport units in such a way that they can be taken out later in the correct order for
installation.
➭ Provide for sufficient ventilation in heated storage rooms.
➭ Check transport units for condensation every 4 weeks.
➭ If the inside of the packing or parts of the switchgear show condensation:
Remove the packing, dry the switchgear and the packing. Refit the packing.

Outdoor storage The storage place must have the following characteristics:
• Protected against rain water
• Protected against flooding as well as melting water from snow and ice
• Protected against pollution and vermin (e.g., insects, mice, rats)
• Even floor to enable stable storage
• Floor with adequate load-bearing capacity
• Sufficient size to enable clearly arranged storage

➭ Place transport units on planks or square timber for protection against floor humidity.
➭ Store transport units in such a way that they can be taken out later in the correct order for
installation.
➭ After 6 months (12 months with seaworthy long-time packing) of storage, unpack the
transport units and store them in closed rooms, or regenerate the seaworthy packing
(see below).

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Regenerating the After 6 months (12 months with seaworthy long-time packing) of storage, the protection of
seaworthy packing the seaworthy packing is exhausted. If the transport units still need to be stored outdoors,
the seaworthy packing must be regenerated.
➭ If there is no sufficient knowledge about professional regeneration of the packing:
Ask for expert personnel via the competent Siemens representative.
➭ Open the packings.
➭ Renew desiccant bags.
➭ Refit the packings so as to reach full protection: Weld the PE protective foils hermetically
tight and rebuild the seaworthy crates completely.

20.3 Tools/auxiliary means

Before starting to work on the switchgear, provide for the tools/auxiliary means required:
• Vacuum pump (e.g. DILO type B048R01), DN8 connection
• Portable hygrometer (e.g. DILO type 3-037-R001 or DILO type 3-038 SF6 multimeter),
DN8 connection
• Volume percentage meter (e.g. DILO type 3-027-R002 or DILO type 3-038 SF6 multimeter),
DN8 connection
• Gas leak detector (e.g. DILO type 3-033-R002)
• SF6 gas filling device (e.g. DILO type 3-393-R001), DN8 connection
• Vacuum cleaner with flexible and thin tube
• 1 set roller pads
• Round-steel bars; diameter: 30 mm, length: 1600 mm for double panel + 600 mm for each
additional panel
• Chain with transport shackles
• Roller crowbars
• Reinforcing bars
• Racks (crank winch)
• Hydraulic jack (2 to 3 t, for vertical and horizontal stroke)
• Emery paper (K 360)
• Step-ladder
• Cable drum
• Drill
• Torque wrench 8 – 20 Nm, 20 to 70 Nm
• Shim plates 0.5 to 1 mm
• Cleaning agent HAKU 1025/90
• Soft, lint-free cloths
• Torx reversing ratchet / screwdriver T10/80, T20/100, T25/100, T30/115
• Water level
• Guide string
• Rod magnet with flexible shaft
• Open spanners SW 13, 16, 17, 18, 19, 24, 27, 32 , 36
• Ring spanners SW 13, 16, 17, 18, 19, 22, 24, 27
• Various screwdrivers
• Vernier caliper
• Water pump pliers
• Mirror with flexible shaft (welding mirror)

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20.4 Installation and fixing material

Before starting to install the individual components, provide for the required installation and
fixing material.

20.5 Comments on electromagnetic compatibility

To achieve appropriate electromagnetic compatibility (EMC), some basic requirements must
be observed while erecting the switchgear. This applies especially to the installation and
connection of external cables and wires.
Basic measures for ensuring EMC are already taken during design and assembly of the
switchgear panels. Among other things, these measures include:
• The low-voltage compartment is an integral part of the panel, which means that the
protection and control devices with the internal wiring are metal-enclosed.
• Reliable earth connections of the frame parts via toothed contact washers or locking
washers.
• Inside the panel, wires are laid in metal ducts.
• Spatial separation of sensitive signal wires from wires with high interference voltage levels.
• Limitation of switching overvoltages of inductive loads (e.g. relay or contactor coils, motors)
by means of protective circuits with diode, varistor or RC element.
• Within the LV compartment, the secondary devices are mounted in defined zones.
• Shortest possible connection between corresponding modules in subracks.
• Consideration of the magnetic leakage fields of conductor bars and cables.
• Protection of subracks and wiring backplanes against interference by perforated shielding
plates.
• Large surface bonding between all modules and devices as well as bonding to the earthing
conductor of the switchgear assembly.

These measures basically enable proper operation of the switchgear itself. The planner or
operator of the switchgear must decide whether additional measures are required depending
on the electromagnetic environment where the switchgear is installed. Such measures must
be implemented by the installation company in charge.
In an environment with heavy electromagnetic interference it may be necessary to use
shielded cables and wires for the external connections in order to avoid interferences in the
low-voltage compartment and thus, undesired influences on the electronic protection and
control or other automation devices.
Cable shields must be electrically bonded to be able to carry high frequencies, and contacted
concentrically at the cable ends.
The shields of cables and wires are connected and earthed in the low-voltage compartment.
Connect the shields to earth potential - with high electrical conductivity and all around as far
as possible. Protect the contact surfaces from corrosion in case of humidity (regular
condensation).
When laying cables into the switchgear assembly, separate the control, signaling and data
cables and other lines with different signal and voltage levels by laying them on separate racks
or riser cable routes.
Corresponding to the different shield designs, there is a number of methods to perform
connection. The planning department or site management determines which of the methods
will be used, taking EMC requirements into account. The preceding points should always be
taken into account.
The shield is connected to cables or wires with clamps contacting all around. If low demands
are placed on EMC, it is also possible to connect the shield directly to earth potential (combine
or twist the shield wires) or via short cable connections. Use cable lugs or wire-end ferrules at
the connecting points.
Always keep the connecting leads of the shields as short as possible (< 10 cm).
If shields are used as protective earth conductors at the same time, the connected plastic-
insulated lead must be marked green/yellow over its entire length. Non-insulated connections
are inadmissible.

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21 Unloading and erecting the transport units

21.1 Packing and transport unit

Packing The transport units can be packed as follows:

• On pallets, covered with PE protective foil
• In a seaworthy crate with long-time packing (switchgear is sealed with desiccant bags in
aluminum-coated PE foil)
• Other packings in special cases

NOTE
The packing materials of the switchgear can be disposed of as classified materials.
➭ Please observe the local regulations for disposal and environmental protection.

Transport unit Transport units consist of:

• Individual panels or panel groups consisting of up to 3 individual panels
• Accessories

21.2 Checking the delivery for completeness and transport damage

Before installation, the transport units must be checked for completeness and damage.

ATTENTION
Transport units may be damaged if stored without intact packing.
➭ If the transport units are stored before installation, open packing for checks only if the
packing is damaged so much that the content must be assumed to be damaged as well.
➭ Refit the packing before installation.
➭ Observe instructions to intermediate storage (see page 59, "Intermediate storage").

Checking for ➭ Check whether the delivery is complete and correct using the delivery notes and packing
completeness lists.
➭ Compare the serial number of the switchgear panels on the delivery note with
that on the packing and the rating plates of the panels.
➭ Check whether the accessories are complete.

Checking for ➭ Unpack the transport units. Do not unpack parts supplied with the switchgear in order to
transport damage avoid loss and damage.
➭ Inform the forwarding agent immediately about any defects or transport damages;
if required, refuse to accept the delivery.
➭ As far as possible, document larger defects and transport damages photographically;
prepare a damage report and inform your regional Siemens representative immediately.
➭ Have the transport damages repaired, otherwise you may not start installation.
➭ Check the SF6 gas pressure.
➭ Refit the packing.

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21.3 Checking the SF6 gas pressure

To exclude any gas losses during transportation in the gas compartments filled at the factory,
check the gas pressure indicators on the panels.

① Gas pressure manometers for the busbar

compartments in system 1
② Gas pressure manometers for the busbar
compartments in system 2
③ Gas pressure manometer for three-
position disconnector housing in
system 2
④ Gas pressure manometer for circuit-
breaker housing
⑤ Gas pressure manometer for three-
position disconnector housing in
system 1
⑥ Critical gas pressure (signaling contact)
⑦ Minimum permissible gas pressure
(signaling contact)
⑧ Actual gas pressure
⑨ Maximum permissible gas pressure
(signaling contact)

Fig. 52: Gas pressure manometers at the panel

Fig. 53: Gas pressure manometer for the circuit-

breaker housing at the panel

DANGER
Operation with incorrect SF6 gas pressure can destroy parts of the switchgear.
➭ Do not install or put the switchgear into operation with incorrect SF6 gas pressures.

➭ Check the gas pressure in the compartments pre-filled at the factory on the associated gas
pressure indicators. The values must not drop below the temperature-dependent limit
values.
➭ If the filling pressure is too low: Do not assemble the part of the switchgear concerned and
inform the regional Siemens representative.

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21.4 Unloading transport units

DANGER
Risk of injury due to transport units falling down. The transport units can slip off the transport
tackle due to the high position of the center of gravity.
➭ Do not stay under suspended loads.
➭ Avoid heavy movement of the load.
➭ Secure the fixing points of the ropes against slipping off.

ATTENTION
Parts of the switchgear may be damaged by touching ropes or chains when lifted.
➭ Use transport tackle / expander.

Lifting packed transport To avoid damage and pollution, the transport units should be transported as long as possible
units with the crane in their original packing. Packed transport units are always lifted with the wooden pallet.
➭ Use transport tackle / spreader to prevent the transport units from being damaged by
the ropes.
➭ Sling the ropes around the ends of the wooden pallets.
➭ Unload the transport units and set them down as close to the switchgear building as
possible in order to avoid unnecessary moves.
➭ Move the transport units into the building, if possible on their wooden pallets. Only remove
packing where absolutely necessary in order to keep the switchgear as clean as possible.
➭ Remove foil only in the building, right before assembling the transport units.
Removing transport units Unpack transport units and remove from the pallets only if
from wooden pallets • there are only short transportation ways left inside the switchgear building, or
• the transport units can be set down with the crane directly at the switchgear building.
The transport unit is screwed on the pallet. The fixing points for transport are located behind
the front metal cover in the frame and at the rear cross member.
➭ Remove the metal covers from the subframes of the panels.
➭ Remove all fixing bolts that connect the transport unit with the transport pallet.
Lifting unpacked To lift the transport unit, two round steel bars with a diameter of 30 mm are required.
transport units Minimum length of the round steel bars: Width of transport unit plus 400 mm.
with the crane
The transport holes for pushing the round bars in are marked on the transport units
with a red symbol.

Fig. 54: Position of transport holes Fig. 55: Marking of transport holes

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Installation

➭ Push the round steel bars into the transport holes at the front and at the rear.
➭ Attach ropes or chains at the ends of the round steel bars.
➭ Stretch the ropes or chains by lifting the transport tackle carefully.
➭ If the ropes or chains are touching the transport unit, use transport tackle / expander.
➭ Lift the transport unit carefully.

21.5 Transporting the units to the place of installation

Preparing the switchgear

room
DANGER
Risk of falling down when crossing provisionally bridged floor openings with the transport
units.
➭ Observe sufficient load-bearing capacity of the bridges.
➭ Support bridges adequately.
➭ Secure bridges against displacement.

➭ Bridge floor openings that have to be crossed and prop up with adjustable supports.
➭ Fix the bridges to secure them against displacement.
➭ Clean the switchgear room. Special cleanliness is required.
➭ Draw a marking line at the place of installation in order to align the switchgear.
➭ Unpack the transport units inside the switchgear building. Do not unpack parts supplied
with the switchgear in order to avoid loss and damage.

Transporting the units

with the pallets
ATTENTION
Sensitive parts of the switchgear may be damaged during transport.
➭ Push the transport units only at the corners of the base frame.
➭ While pushing, take care not to damage any sensitive parts of the switchgear such as gas
pipes, bursting discs, shafts, etc.

➭ Move the transport units as close as possible to the place of installation (switchgear room)
by means of lifting trucks or fork-lift trucks.

Lifting the transport unit Two round steel bars with a diameter of 30 mm are required which are pushed into the
with hydraulic or transport holes at the transport unit, same as described for lifting with the crane (see page 65,
lifting jacks "Unloading transport units").

DANGER
If they are lifted unevenly, the transport units can fall over due to their high center of gravity.
➭ Lift the transport units slowly and evenly.

➭ Push the round steel bars into the transport holes at the front and at the rear.
➭ Support the hydraulic or lifting jacks with robust and stable platforms so that they will reach
the bars in lowered condition.
➭ Lift the transport unit carefully.

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Further transport without ➭ Before lifting the transport unit with a fork-lift truck, knock the boards marked at the front
wooden pallets out of the wooden pallet.

Fig. 56: Lifting the transport unit with the fork-lift truck
① Boards marked at the front

➭ Lift the transport unit with a crane, hydraulic jacks or a fork-lift truck.

Fig. 57: Example for craning the transport unit

① 1037 mm (height of switchgear dependent on built-on components)
② 622 mm

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Installation

➭ Lower the transport unit onto roller pads (reinforced rollers), or tubes
(approx. 30 mm diameter). Distribute the roller pads so as to support the transport unit at
the outer edges and at the joints between the panels.
➭ Lift one side, then the other side of the transport unit with roller crowbars and slowly lower
it on the mounting position. Apply the roller crowbars only at the corners of
the transport units.
Transporting the unit on ➭ Prepare four roller pads (reinforced rollers) or two bars.
roller pads/bars
➭ Lift the transport unit as described above.
➭ Place the roller pads in position at the external corners of the base frame under the vertical
frame supports, or lay the bars crosswise under the base frame of the transport unit.
➭ Lower the transport unit slowly and evenly onto the roller pads/bars.

NOTE
A transport unit standing on roller pads can only be moved straight ahead.
➭ To change the direction, the position of the roller pads must be changed.

21.6 Setting down the transport units at the place of installation

Depending on the constructional facts in the switchgear room, there are two basic
possibilities for setting down the transport units at the place of installation:

1. Setting down from the narrow side of The transport units are moved over the floor opening to
the floor opening the cable basement coming from the narrow side of
the floor opening, and are set down side by side
2. Setting down from the long side of The transport units are set down in front of the long side
the floor opening of the floor opening to the cable basement, and are
pushed over the floor opening

Fig. 58: Setting down from the narrow side of Fig. 59: Setting down from the long side of
the floor opening the floor opening

① Transport unit ③ Door to the switchgear room

② Floor opening

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Setting down Precondition:

the transport units from The transport units must be standing on the roller pads / bars without pallet.
the narrow side of
the floor opening
DANGER
The transport units can fall down when they are moved over the floor opening.
➭ When moving the transport unit on the floor opening, take care that the roller pads / bars
are always touching the foundation completely.
➭ Check the moving direction of the transport unit all the time.

ATTENTION
Without roller pads / bars underneath, the transport units are moved using hydraulic or lifting
jacks. The transport units may be damaged.
➭ Apply auxiliary devices at floor level and only at the base frame of the transport units.
➭ Place boards under the points where auxiliary devices are applied.

➭ Roll the first transport unit (end panel) along the floor opening up to its final position.
➭ Lift the transport unit.
➭ Remove the roller pads / bars from underneath the transport unit.
➭ Set down the transport unit carefully.
➭ Shift the transport unit with hydraulic jacks, lifting equipment or lifting jacks until it is
exactly aligned on its mounting position. Prop the hydraulic equipment or jacks up at the
surrounding walls.
➭ Roll the next transport unit along the floor opening, place it at a distance of 500 mm from
the first transport unit and align it roughly.
➭ Lift the transport unit, remove the roller pads / bars and set down the transport unit
carefully.
➭ Proceed in the same way with the other transport units, keeping a distance of 500 mm
between them.

Setting down Precondition:

the transport units from The transport units must be standing on the roller pads / bars without pallet.
the long side of
the floor opening
DANGER
The transport units can fall down when they are moved over the floor opening.
➭ When moving the transport unit on the floor opening, take care that the roller pads / bars
are always touching the foundation completely.
➭ Check the moving direction of the transport unit all the time.

ATTENTION
Without roller pads / bars underneath, the transport units are moved using hydraulic or lifting
jacks. The transport units may be damaged.
➭ Apply auxiliary devices at floor level and only at the base frame of the transport units.
➭ Place boards under the points where auxiliary devices are applied.

➭ Roll the first transport unit up to the final position in parallel to the floor opening.
➭ Lift the transport unit.
➭ Remove the roller pads / bars from underneath the transport unit.
➭ To shift the transport unit easily and to protect the floor, shims can be laid under as
a sliding aid.
➭ Set down the transport unit carefully.

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➭ Shift the transport unit with hydraulic jacks, lifting equipment or lifting jacks until it is
exactly aligned on its mounting position. Prop the hydraulic equipment or jacks up at the
surrounding walls.
➭ If the transport unit is still partly or totally standing on the shims, remove the shims and
carefully set down the transport unit again.
➭ Roll the next transport unit in front of the floor opening and place it beside the first
transport unit at a distance of 500 mm.
➭ Lift the transport unit.
➭ Remove the roller pads / bars from underneath the transport unit and lay shims under,
if required.
➭ Set down the transport unit carefully and push it over the floor opening as described above.
➭ Align the transport unit roughly, observing a side distance of at least 500 mm.
➭ Remove the shims from underneath the transport unit as described above.
➭ Proceed in the same way with all other transport units.

21.7 Aligning the switchgear

To align the switchgear, please follow the illustration below:

① First transport unit,

completely aligned
② Other transport units,
roughly aligned

Fig. 60: Position of the transport units after erection

➭ Align the first transport unit (end panel) completely and bolt it to the foundation
(see page 53, "Constructional data of the foundation").
➭ Just align the other transport units (panels) roughly first.
➭ Keep a distance of at least 500 mm between the transport units for
the following installation work.
If not all parts of the switchgear can be brought into the switchgear room before installation
due to the little space available, proceed as follows:
➭ Place as many transport units as possible side by side.
➭ Mount these transport units.
➭ Put other transport units on the free space left, etc.

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22 Assembling the switchgear

NOTE
The activities described hereafter must be carried out by certified personnel who is familiar
with installation of switchgear type 8DB10.
➭ The switchgear must be assembled by certified personnel only.

The points the transport units are interconnected at are called panel joints hereafter.

① Transport unit on the right of the panel joint

② Panel joint
③ Transport unit on the left of the panel joint

Fig. 61: Term "panel joint"

Precondition: The transport units are standing in the switchgear room and are aligned for
assembly (see page 70, "Aligning the switchgear").
Procedure: Repeat the following operations for all transport units until final assembly.

22.1 Preparing busbar assembly

Removing During transport, fixing brackets retain the busbars at the open flange connections of the
the transport blocks busbar housings. The fixing brackets are bolted together with the flanges of the busbar
housings and the busbar ends.

ATTENTION
If the switchgear is transported without transport blocks (fixing brackets), parts of the
switchgear may be damaged.
➭ Do not remove the transport blocks until right before assembly.
➭ Do not move the transport units over longer distances without transport blocks.

➭ Switch all three-position disconnectors of the transport units located on the right ③ and on
the left ② of the panel joint to READY-TO-EARTH position.
➭ If there are any make-proof busbar earthing switches: Switch the make-proof busbar
earthing switches to OPEN position.
➭ Remove the fixing brackets from all flanges at the panel joint.

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Preparing busbar This operation is only performed if there is a horizontal flange cover available on
assembly on the busbar housing of the panel located on the right of the panel joint.
the panel located on
the right of
the panel joint

Fig. 62: Preparing busbar assembly on the panel located on the right of the panel joint
(example with elbow coupling)

Fig. 63: Preparing busbar assembly on the panel located on the right of the panel joint
(example with flexible connectors)

① Busbar housing of the panel located on ④ Busbar housing of the panel located on
the left of the panel joint the right of the panel joint
② Assembly openings (horizontal flanges) in ⑤ Busbar support
the busbar housings of the panel located
on the right of the panel joint
③ Fixing bolts ⑥ Flexible connectors
⑦ Elbow coupling

➭ Remove all horizontal flange covers from the assembly openings ② on the busbar housings
④ of the panel located on the right of the panel joint.
➭ Mark the cover type, and re-assemble later (see page 49, "Overview of busbar covers").
➭ Loosen the fixing bolts ③ at the busbar ends.

Re-assembling This operation is only performed if one of the following devices is mounted on the busbar
the busbars housings of the panel located on the right of the panel joint:
• Disconnectable busbar connection
• Disconnectable busbar voltage transformer
• Make-proof busbar earthing switch
• Top-mounted busbar sectionalizer

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In these cases, the busbar joints are not accessible anymore after the transport units have
been interconnected.
For this reason, the busbar sections must be re-assembled from the panel on the left of the
panel joint to the panel on the right before starting the assembly. The illustration below
shows the final position after re-assembling.

Fig. 64: Re-assembling the busbars (example with elbow coupling)

Fig. 65: Re-assembling the busbars (example with flexible connectors)

① Busbar housing of the panel located on the left ⑥ Busbar housing of the panel located on the
of the panel joint right of the panel joint
② Assembly openings (horizontal flanges) ⑦ Joints of the panel located on the right of the
panel joint
③ Joints of the panel located on the left of the ⑧ Vertical flanges of the panel located on the
panel joint right of the panel joint
④ Vertical flanges of the panel located on the left ⑨ Elbow coupling
of the panel joint
⑤ Busbar sections ⑩ Flexible connectors
⑪ Busbar support

➭ Clear the assembly opening ② : Remove all horizontal flange covers on the busbar housings
① of the panel located on the left of the panel joint.
➭ Undo the busbar sections ⑤ at the joints ③ in the busbar housing through the assembly
opening ② . The busbar supports ⑨ remain on the disassembled busbar sections.
➭ Take the busbar sections ⑤ out of the housings together with the associated busbar
supports ⑨ through the vertical flange ④ .
➭ Mount the busbar sections at the joints ⑦ in the busbar housings ⑥ of the panel located on
the right of the panel joint. Assembly takes place through the vertical flanges ⑧ .
➭ Check alignment and parallel position of the assembled busbar sections and correct
if required.

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Preparing the flanges of

the busbar housings ① External contact surface of the flange
② Groove for toroidal sealing ring

Fig. 66: Flange on the busbar housing

➭ Clean all vertical flanges of the busbar housings at the panel joint and the grooves for
the sealing rings carefully with lint-free paper.
➭ Carefully check the external contact surfaces ① of the flanges and the grooves ② for
scratches, other damages or pollution. Damages and pollution will cause leaks.
➭ If any external contact surfaces or grooves are damaged: Inform the regional Siemens
representative and co-ordinate the elimination of damages.
➭ Apply a thin film of the supplied mounting paste (e.g. Polylub GLY 801, 0.40 kg) on
the external contact surfaces of the flanges and the O-rings (sealing rings). To do this, apply
a grease strip of approx. 3 mm thickness on the external contact surfaces of the flanges.
➭ Put the O-rings into the grooves of the flanges.

22.2 Installing transport units

Positioning The transport unit to be attached is moved evenly by two people, if possible, using hydraulic
the transport unit hoisting cylinders, hydraulic jacks or lifting jacks. A third person acts as an observer and
corrects the joining of the busbar sections and the flanges during the process.

ATTENTION
When joining the transport units, the busbar supports may be damaged.
➭ Join the transport units carefully.
➭ Observe the position of the busbar supports.

ATTENTION
Without roller pads / bars underneath, the transport units are moved using hydraulic
equipment or lifting jacks. The transport units may be damaged.
➭ Apply auxiliary devices at floor level and only at the base frame of the transport units.
➭ Place boards under the points where auxiliary devices are applied.

ATTENTION
Sensitive parts of the switchgear may be damaged during installation work at the busbar and
the busbar housings.
➭ While working at the busbars or the busbar housings, prop up only on the base frame of
the transport unit.
➭ Do not prop up on sensitive parts of the switchgear like gas pipes, bursting discs,
shafts, etc.

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➭ Apply one lifting gear each at the rear and at the front of the base frame of the transport
unit to be shifted. Prop the lifting gear up at the surrounding walls.
➭ Place one person in observer position at the already mounted transport unit. The observer
must watch the movement of the flanges and the busbars and must be able to reach
the busbar sections by hand through the assembly openings.
➭ If the flange connections are equipped with a compensator or insulating joint:
Fix the associated insulating rings / insulating plates provisionally at the flange side of
the already fixed-mounted transport unit.
➭ On the observer´s command, push the transport unit to be attached towards the already
mounted one using the lifting gear. The observer checks and corrects the approach of
the busbar sections.
➭ Continue approaching the transport units until the flanges touch evenly.
➭ In case of deviations, correct the position of the transport unit, compensating any floor
unevenness with shims under the corners (same points as for roller pads / bars).

Bolting the flanges of the

busbar housings together
ATTENTION
Sensitive parts of the switchgear may be damaged during installation work at the busbar and
the busbar housings.
➭ While working at the busbars or the busbar housings, prop up only on the base frame of
the transport unit.
➭ Do not prop up on sensitive parts of the switchgear like gas pipes, bursting discs,
shafts, etc.

➭ Flange-to-flange connections: Tighten M8x40 bolts crosswise. Tightening torque: 20 Nm.

① Busbar housing
② Toroidal sealing ring

Fig. 67: Flange-to-flange connection

➭ Flange connections with compensator: Push insulating ring between the flanges.
Fasten M8x55 bolts crosswise with one insulating sleeve each. Tightening torque: 20 Nm.

① Busbar housing (bolts M8x55)

② Toroidal sealing ring
③ Insulating ring (thickness: 18 mm)
④ Compensator
⑤ Busbar housing (bolts M8x35)

Fig. 68: Short busbar housing with compensator

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➭ For flange connections with compensator, insulating sleeves must be inserted at

the bolted joints.

① Insulating sleeve
② Busbar housing
③ Insulating ring (thickness: 18 mm)
④ Toroidal sealing rings
⑤ Compensator

Fig. 69: Flange connection with

compensator and insulating sleeve

➭ Flange connections with insulating joint: Push insulating ring between the flanges.
Fasten M8x45 bolts crosswise with one insulating sleeve each. Tightening torque: 20 Nm.

① Busbar housing
② Toroidal sealing ring
③ Insulating ring (thickness: 4 mm)
with sealing ring ④

Fig. 70: Long busbar housing with insulating joint

➭ If there are e. g. busbar current transformers or expansion joints available,

the flange connections must be equipped with insulating sleeves.

① Current transformer mounting plate

② Flange
③ Insulating ring
④ Compensator
⑤ Insulating sleeve

Fig. 71: Flange connections with

insulating sleeve

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Bolting busbars together The busbars are accessed through the horizontal flanges of the busbar housings
(assembly openings).
➭ Check whether the busbar has been pre-assembled with a post insulator ① .

➭ Align busbar and post insulator horizontally with each other using the clearance of
the busbar hole.
➭ Align the busbars and the links so that the busbar sections are in line and the fixing bolts will
fit through the holes.
➭ Tighten the fixing bolts just a little. The busbar sections must still be able to move.

22.3 Installing further transport units

➭ Repeat the work operations (see page 71, "Preparing busbar assembly") until all transport
units are installed.

22.4 Completing switchgear installation

As a precondition for this work, the switchgear must have been completely assembled as
described above (see page 77, "Installing further transport units").

Tightening ➭ Tighten the fixing bolts of all busbars and fixed contacts at all panel joints of the switchgear.
the busbar fixing bolts Tightening torque: 40 Nm.
➭ Finally fit the protective caps on the bolted busbar joints.

Checking the contact In CLOSED position, the contact fingers must rest exactly on the fixed contact of the
overlapping of the disconnector. Check the contact overlapping with suitable means. For open housing covers,
disconnector contacts a welding mirror and a pocket lamp are suitable. For badly visible points, a stick-mounted
camera with a flex handle is suitable.

Fig. 72: Example for correct and incorrect position of the contact fingers on the fixed contact

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Installation

Correcting contact
① Hexagonal sleeve of
overlapping of disconnector coupling rod
disconnector contacts
② Locknuts

Fig. 73: Disconnector coupling rod

➭ Undo the locknuts ② at the hexagonal sleeve of the disconnector coupling rod ① .
➭ Modify the length of the disconnector coupling rod by turning the hexagonal sleeve ① ,
so that the contact fingers are resting exactly on the fixed contact of the disconnector in
CLOSED position.

Fig. 74: Example for correct and incorrect position of the contact fingers
on the fixed contact

➭ Verify proper contact overlapping after several switching operations with

the operating mechanism of the three-position disconnector.
➭ Tighten the locknuts ② again with a tightening torque of 20 Nm.

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Mounting busbar housing

covers without
desiccant bag holders
ATTENTION
In the ambient air, the desiccant bags lose their effectiveness rapidly and cannot be used
anymore.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ Do not use desiccant bags if the humidity indicators are pink.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes and close the gas compartment hermetically.

For this reason, the busbar housing covers without a holder for desiccant bags are mounted
first (cover without "Filter" inscription).
➭ Remove tools, clean the inside of the housings with a hand vacuum cleaner, and clean
the bushing plates with a rag.
➭ Prepare the flanges of the cleaned busbar housings for assembly.
➭ Clean the contact surfaces of the busbar housing covers with a lint-free paper, and apply a
thin film of grease (e.g. Polylub GLY 801, 0.40 kg).
➭ Put the covers on the prepared flanges and bolt them tight crosswise.
Tightening torque: 20 Nm.

Bolting The subframes of the transport units are bolted together at the panel joints using connecting
the subframes together links at the front and a connecting plate at the rear.

Fig. 75: Bolting the subframe together

(representation with 4MC4 current
transformer)

① Connecting plate (rear)

② Connecting links (front)

➭ Align adjacent connecting links at the subframes. The holes must be in line.
➭ Bolt the transport units together at the front connecting links using four bolts M10 x 20
(tightening torque 40 Nm), and at the rear connecting plate using two coach bolts
M10 x 20 (tightening torque 40 Nm).

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Fastening the panels to ➭ Fasten the panels to the foundation (see page 53, "Constructional data of the foundation").
the foundation
Mounting the cable bracket

Standard version for ➭ Mount the cable bracket at the cross members down at the subframe.
round panel
connection housing
① Hexagon socket-head bolt M10 x 20 with nut
② Subframe
③ Bracket at the cable bracket
④ Hexagonal bolt M10 x 20 with nut

Fig. 76: Round panel connection housing: Mounting the cable

bracket (representation with 4MC4 current transformer)

Standard version for ➭ Mount the cable bracket at the cross members down at the subframe.
square panel
connection housing ① Hexagon socket-head bolt
M10 x 20 with nut
② Subframe
③ Bracket at the cable bracket
④ Hexagonal bolt M10 x 20 with nut

Fig. 77: Square panel connection housing:

Mounting the cable bracket (representation
without 4MC4 current transformer)

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➭ Bolt C-rails to the cable brackets.

① C-rail at the rear

② C-rail at the front

Fig. 78: Mounting the C-rails at the cable brackets

(representation without 4MC4 current transformer)

① Lock washer M8
② Hexagonal bolt M8 x 50
③ Bracket
④ Hexagonal nut M8

Fig. 79: Mounting the C-rails at the cable brackets

(representation without 4MC4 current transformer)

Extended version for ➭ Mount the cable bracket at the cross members down at the subframe.
square panel connection
housing ① Hexagon socket-head bolt
M10 x 20 with nut
② Subframe
③ Bracket at the cable bracket
④ Hexagonal bolt
M10 x 20 with nut

Fig. 80: Square panel connection housing:

Mounting the extended cable bracket
(representation without 4MC4 current transformer)

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Installation

➭ Bolt C-rails to the cable brackets.

① C-rail at the front

② C-rail at the rear

Fig. 81: Mounting the C-rails at the cable brackets

(representation without 4MC4 current transformer)

① Lock washer M8
② Hexagonal bolt M8 x 50
③ Bracket
④ Hexagonal nut M8

Fig. 82: Fixing points of the C-rails at the cable brackets

(representation without 4MC4 current transformer)

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Bolting The earthing busbar runs at the rear of the subframes. The units overlap and are
earthing busbars together interconnected with two bolts M12 x 45 and a tightening torque of 70 Nm each.

① Earthign busbar section

folded up
(as-delivered condition)
② Joint
③ Pre-assembled earthing
busbar section

Fig. 83: Bolting earthing busbars together

➭ Remove the left-hand bolt at the joint ② .

➭ Undo the right-hand bolt at the joint ② and fold the earthing busbar section ① to
the left into horizontal position.
➭ Bolt the earthing busbar section ① together with the earthing busbar of the next transport
unit using 2 bolts. Tightening torque: 70 Nm.
➭ Refit the removed bolt at the joint ② and tighten the two bolts at the joint.
Tightening torque: 70 Nm.
➭ Proceed in the same way with all other transport units until all earthing busbar ends of
the switchgear are interconnected.
Earthing the panels The cross-sections and materials of the earthing conductors are specified in the DIN/VDE 0101
standard or in the IEC 61936-1 and in the relevant country-specific standards.
➭ Connect the earthing busbar to the substation earth.
Recommendation: In case of panel groups, earth the end panels (M12 bolts) and
every fifth panel at least.
➭ Mount an earthing cable or an earthing bar to the earthing bolt ① of the earthing busbar.

① Earthing bolt
(earthing point)

Fig. 84: Earthing bolt of earthing busbar, example: right end panel

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Installation

23 Installation work with SF6 gas before commissioning

If a rated short-duration power-frequency withstand voltage test has to be carried out at site,
the work with insulating sulphur hexafluoride gas (SF6) described in this section must be
performed in advance.

DANGER
Danger of suffocation! SF6 gas is heavier than air and concentrates first near to the floor and in
floor openings.
➭ Do not let SF6 gas get into the environment.
➭ While working with SF6 gas, provide for sufficient ventilation.
➭ After working with SF6 gas, vent the cable basement and any hollows in the floors with
special care.
➭ Observe the safety data sheet for SF6 gas.
➭ Please observe IEC 62271-303 and -304.

23.1 Completing busbar assembly and filling with SF6 gas

The individual phases and sections of the busbar (called busbar runs hereafter) must be filled
with SF6 gas at site. Each busbar run forms one gas compartment.
Busbar runs within one transport unit that are already filled and closed hermetically at
the factory are not refilled with SF6 gas on site.
All parts of the switchgear that have to be filled with gas are equipped with desiccant bags in
order to eliminate residual humidity in the gas filling. In ambient air, the desiccant agent loses
its effectiveness rapidly.
To expose the desiccant bags as briefly as possible to the ambient air, the following
installation and gas work is performed completely on one busbar run, and is then continued
on the next busbar run, etc.

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Preparing the busbar run for filling gas

Fig. 85: Desiccant bags in the gas compartments, design example

(position identified in the illustration by black squares; on the switchgear,
with the inscription "Filter" on the outside)

Item no. Designation Desiccant bags

① Busbar housing, left end panel 2 x 250 g
② Busbar housing, right end panel 2 x 250 g
③ Busbar housing, general type with "Filter" inscription on the cover 2 x 250 g
④ Top-mounted bus sectionalizer 2 x 250 g
⑤ Bus coupler 1 x 250 g
⑥ Interconnection housing of bus sectionalizer 4 x 250 g
⑦ Circuit-breaker housing, right-hand panel of bus sectionalizer
⑧ Bus riser housing
⑨ Circuit-breaker housing, general type 2 x 250 g
⑩ Three-position disconnector housing, general 2 x 250 g

NOTE
Observe the mounting location of circuit-breaker and bus riser housing in the bus sectionalizer.
➭ If the circuit-breaker housing of a bus sectionalizer is mounted in the right-hand panel,
the bus riser housing is located in the left-hand panel.

ATTENTION
In the ambient air, the desiccant bags lose their effectiveness rapidly and cannot be used
anymore.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ Do not use desiccant bags if the humidity indicators are pink.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes and close the gas compartment hermetically.

➭ Remove all covers with the "Filter" inscription from the housings of one busbar run.
➭ Clean busbar housings that are dirty inside with a hand vacuum cleaner. In this case, clean
the bushing plates too with a rag.
➭ Prepare the flanges of the busbar housings for assembly.
➭ Clean the contact surfaces of the busbar housing covers with a lint-free paper,
and apply a thin film of grease (e.g. Polylub GLY 801, 0.40 kg).

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➭ Determine the size of the desiccant bags required for each busbar housing and
place the originally packed desiccant bags at the corresponding covers.
➭ Take the desiccant bags out of the packings and lay them completely into the associated
holder in the covers.
➭ Put the busbar covers with the bags into position. Observe that no part of the bags is
jammed in the contact surfaces in order to prevent leaks.
➭ Bolt the covers tight crosswise. Tightening torque: 20 Nm.

Evacuating the busbar run Before filling SF6 gas in, the air must be removed from the busbar run to be filled with gas
with the vacuum pump (evacuation). One of the covers next to the right and left end panel of the switchgear contains
the pressure indicators and gas filling valves for all busbar runs.
Evacuating a five-panel busbar run takes about 30 to 40 minutes.

① Manometers of the SF6 gas

compartments for busbars L1, L2, L3 of
busbar system 1
② Manometers of the SF6 gas
compartments for busbars L1, L2, L3 of
busbar system 2
③ Manometer for three-position
disconnector housing in busbar system 2
④ Manometer for circuit-breaker housing
⑤ Manometer for three-position
disconnector housing in busbar system 1

Fig. 86: Gas pressure manometers and

gas filling valves at the switchgear front

➭ Undo the locking cap of the gas filling valve ② for the completely closed busbar run.
➭ Connect the vacuum pump to the valve of the busbar run ② . Use short tubes with
the largest inside diameter possible.
➭ Evacuate the housings down to a pressure of less than 2 kPa.
Manometer indication: -100 kPa. Measure the pressure with the vacuum pump locked.
➭ Depending on the inside diameter and length of the vacuum pump tube, let the pump
operate for another 5 to 15 minutes.
➭ Remove the pump tube. The valve in the gas filling valve closes automatically.

Filling the busbar run ➭ Determine the filling pressure required according to the rating plate
with an SF6 gas cyclinder (see page 48, "Rating plates") and the data given in Section "Insulating gas SF6"
(see page 44, "Insulating gas SF6"). The pressure depends on the gas temperature.
➭ Connect the SF6 gas cylinder to the gas filling valve of the evacuated busbar run.
➭ Fill SF6 into the busbar run until the necessary pressure is reached. Check the filling pressure
on the pressure indicator of the busbar run and on the pressure indicator of the gas filling
equipment.
➭ Remove the connecting tube of the gas cylinder from the gas filling valve.
The gas filling valve closes automatically.

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➭ Refit the locking cap of the gas filling valve.

➭ The limit value indicators on the pressure indicator of the busbar run have been pre-
adjusted at the factory. Check the limit pressures according to the table and the graphics
(see page 44, "Insulating gas SF6"), and correct with the supplied square socket spanner in
case of deviations.

Completing the assembly ➭ Fill all other busbar runs as described above (see page 84, "Completing busbar assembly and
of further busbar runs and filling with SF6 gas").
filling with SF6 gas

23.2 Installing the panel connections supplied in the accessories, and filling
the circuit-breaker housing with SF6 gas
For the installation of panel connections that are supplied separately, the circuit-breaker
housing is not filled with SF6 gas at the factory.

To expose the desiccant bags as briefly as possible to the ambient air, the installation work
described hereafter is performed completely on one circuit-breaker housing in one panel.

ATTENTION
Desiccant bags that have been fitted in the circuit-breaker housings at the factory are not
effective anymore if the housings remain open for more than half an hour.
➭ Replace desiccant bags in circuit-breaker housings that have been open for more than
half an hour.

Assembling panel ➭ Remove 8 pan-head bolts and 8 strain washers from the cover of the transformer housing ① .
connections supplied
separately ① Cover of transformer housing
② Transformer housing

Fig. 87: Removing the cover of

the transformer housing

NOTE
Do not reuse the removed pan-head bolts, strain washers and the toroidal sealing ring.
➭ Dispose of the pan-head bolts, strain washers and the toroidal sealing ring in an
environmentally compatible way.

➭ Remove the cover of the transformer housing ① and the toroidal sealing ring ③ .

① Cover of transformer housing

② Transformer housing
③ Toroidal sealing ring

Fig. 88: Removing the cover of the

transformer housing and the seal

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➭ Undo 11 bolt-and-washer assemblies M8x40 and 1 hexagonal bolt (with plain washer and
spring washer) at the cover of the panel connection housing ④ .

④ Cover of panel connection housing

Fig. 89: Removing the cover with the plug sockets

➭ Remove the panel connection housing ⑤ .

➭ Take the sealing ring ⑥ out of the groove in the cover of the panel connection housing.

④ Cover of panel connection housing

⑤ Panel connection housing
⑥ Sealing ring

Fig. 90: Removing the panel

connection housing

➭ Remove 4 pan-head bolts, 4 nuts and 4 strain washers from the cover of the panel
connection housing ⑦ .

NOTE
Do not reuse the removed pan-head bolts, strain washers and nuts.
➭ Dispose of the pan-head bolts, strain washers and nuts in an environmentally
compatible way.

➭ Remove the cover of the panel connection housing ⑦ .

Fig. 91: Removing the cover of the panel connection housing

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NOTE
Depending on the panel connection version, the feeder current and whether there are voltage
transformers available, the panel connection stud is delivered in different lengths.
➭ Before assembling the panel connection stud, verify the correct length according to
the supplied overview (861-9582.9).

➭ Bolt the panel connection stud ⑧ to the bushing terminal ⑪ using 4 pan-head
bolts M8x50 ⑨ and 4 strain washers ⑩ from the accessories (tightening torque: 20 Nm).

⑧ Panel connection stud

⑨ Pan-head bolt M8x50 (4x)
⑩ Strain washer (4x)
⑪ Bushing terminal

Fig. 92: Fastening the panel connection stud

➭ Grease the toroidal sealing ring ③ uniformly with the supplied mounting paste
(e.g. Polylub GLY 801, 0.40 kg).
➭ Insert the toroidal sealing ring ③ in the panel connection housing ⑤ .

Fig. 93: Inserting the toroidal sealing ring

➭ Bolt the panel connection housing ⑤ to the transformer housing ② using 8 pan-head
bolts M6x20 (with Polylok coating) ⑫ from the accessories (tightening torque: 10 Nm).

⑤ Panel connection housing

⑧ Panel connection stud
⑫ Pan-head bolt M6x20 with
Polylok coating (8x)

Fig. 94: Fastening the panel connection housing

(view from below)

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Installation

➭ Clean the sealing ring ⑥ removed from the panel connection housing, and grease it
uniformly with the supplied mounting paste (e.g. Polylub GLY 801, 0.40 kg).
➭ Insert the sealing ring ⑥ in the groove of the cover of the panel connection housing ④ .

Fig. 95: Inserting the sealing ring

➭ Grease the contact laminations ⑬ with mounting paste Vaseline 8422 DAB 8
(order number: 8BX2091).

Fig. 96: Greasing the socket

NOTE
In other panel connection versions, the plug sockets may be arranged asymmetrically.
➭ If the plug sockets are arranged asymmetrically, observe the mounting direction of the
cover of the panel connection housing.

➭ Push the cover of panel connection housing ④ into the panel connection housing ⑤ .

Fig. 97: Inserting the cover of the panel connection housing

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➭ Refasten the cover of the panel connection housing ④ with 11 bolt-and-washer

assemblies M8x40 (tightening torque: 20 Nm).

Fig. 98: Fastening the cover with the plug sockets

The earthing cable is either pre-assembled at the subframe, or fastened to the subframe
with cable straps.
➭ Bolt the earthing cable to the subframe if the earthing cable is not pre-assembled.
➭ Bolt the earthing cable ⑭ with an hexagonal bolt M8x40 (with plain washer and spring
washer) to the cover of the panel connection housing (tightening torque: 20 Nm).
➭ Repeat the above work operations for all other panel connections in the same panel.
✔ The panel connections are assembled.

Replacing The desiccant bags are located behind the cover of the bursting disc at the side of
desiccant bags in the the circuit-breaker housing. The cover has the inscription "Filter".
circuit-breaker housings
① Cover of bursting disc

Fig. 99: Cover of bursting disc on circuit-breaker housing

ATTENTION
In the ambient air, the desiccant bags lose their effectiveness rapidly and cannot be used
anymore.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ Do not use desiccant bags if the humidity indicators are pink.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes and close the gas compartment hermetically.

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Installation

➭ Remove the lateral cover of the bursting disc with the "Filter" inscription on one circuit-
breaker housing.
➭ Unpack two new desiccant bags of 250 g each per pole, and put them completely into the
holder.
➭ Clean the sealing surfaces of the cover of the bursting disc with a lint-free paper, and apply a
thin film of grease.
➭ Put the covers the bursting disc with the bags into position. Observe that no part of the bags
is jammed in the sealing surfaces in order to prevent leaks.
➭ Bolt the covers tight crosswise. Tightening torque: 20 Nm.
➭ Repeat the above work operations for all circuit-breaker housings on the same panel where
the desiccant bags must also be fitted.
➭ After completing the replacement of desiccant agent in the panel, evacuate the circuit-
breaker housings and fill them with SF6 gas (see below).

Evacuating the circuit- The circuit-breaker housings of one panel form a common gas compartment. Before filling
breaker housings with SF6 gas in, the air must be removed from the circuit-breaker housings (evacuation).
the vacuum pump
The pressure indicator and the gas filling valve for the circuit-breaker housings of one panel
are located on the right side of the housing front.
➭ Undo the locking cap of the gas filling valve for the circuit-breaker housings.
➭ Connect the vacuum pump to the valve. Use short tubes with the largest inside diameter
possible.
➭ Evacuate the housings down to a pressure of less than 2 kPa.
Manometer indication: -100 kPa. Measure the pressure with the vacuum pump locked.
➭ Depending on the inside diameter and length of the vacuum pump tube, let the pump
operate for another 5 to 15 minutes.
➭ Remove the pump tube. The gas filling valve closes automatically.

Filling the circuit-breaker ➭ Determine the filling pressure required according to the rating plate and the data given in
housings with SF6 gas Section "Technical data" (see page 42, "Technical data"). The pressure depends on the gas
temperature.
➭ Connect the SF6 gas cylinder to the gas filling valve of the evacuated circuit-breaker
housings.
➭ Fill SF6 into the circuit-breaker housings until the necessary pressure is reached. Check the
filling pressure on the pressure indicator of the circuit-breaker housings and on the pressure
indicator of the gas filling equipment.
➭ Remove the connecting tube of the gas cylinder from the gas filling valve. The gas filling
valve closes automatically.
➭ Refit the locking cap of the gas filling valve.
➭ Adjust the limit pressures on the pressure indicator for the circuit-breaker housings with the
supplied square socket spanner (see page 44, "Insulating gas SF6").

Evacuating and filling The procedure to be followed corresponds to the work operations described above for
the circuit-breaker evacuating and filling without maintenance unit. As against working with vacuum pump and
housings with gas cylinder, the maintenance unit offers better environmental protection due to reduced SF6
the maintenance unit losses.
The same gas pressure data apply as for filling with gas cylinder. Observe the operating
instructions of the maintenance unit!

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24 Performing the power- frequency voltage test

The transport units are already tested at the factory at rated short-duration power-frequency
withstand voltage. On the customer´s request, the dielectric strength of the switchgear can
be tested on site. This is a repeat test at 80% of the values according to IEC 62271-1 and -200.

Preparing the power-

frequency voltage test
DANGER
High voltage! Danger! If the panel feeders are included in the rated short-duration power-
frequency withstand voltage test, the panel connections are live during the test.
➭ Keep a minimum distance of 3 m to the panel connections.

ATTENTION
If the rated short-duration power-frequency withstand voltage test is performed incorrectly,
the switchgear may be damaged.
➭ Do not perform a rated short-duration power-frequency withstand voltage test without
the manufacturer´s assistance.

ATTENTION
Already mounted non-disconnectable inductive voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200 will be damaged during the rated
short-duration power-frequency withstand voltage test.
➭ Remove already mounted non-disconnectable inductive voltage transformers.
➭ Do not install non-disconnectable inductive voltage transformers until the rated short-
duration power-frequency withstand voltage test has been completed.

Due to the interlocking condition, busbar system 1 and busbar system 2 must be tested
separately from each other.
➭ Check the SF6 gas filling (see page 128, "Checking the SF6 gas filling").
➭ Before the test, remove non-disconnectable voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200.
➭ Cover the bushings at the panel with surge-proof caps.

Testing busbar system 1 ➭ Switch the three-position disconnector of busbar system 1 and the circuit-breaker in
the incoming panel to CLOSED position for the rated short-duration power-frequency
voltage test.
➭ Fit dummy plugs on all free sockets of the incoming panel.
➭ While testing circuit-breaker panels: Fit dummy plugs on all sockets of the panel to be
tested.
➭ Earth and short-circuit all test sockets of the voltage detecting system.
➭ Switch all other three-position disconnectors to READY-TO-EARTH position.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable connection
bushing via test adapters.
✔ The rated short-duration power-frequency withstand voltage test can now be performed.

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Testing busbar system 2 ➭ Switch the circuit-breaker and the three-position disconnector of busbar system 1 in
the incoming panel to OPEN position.
➭ Switch the disconnector of busbar system 2 and the circuit-breaker in the incoming panel to
CLOSED position for the rated short-duration power-frequency voltage test.
➭ Fit dummy plugs on all free sockets of the incoming panel.
➭ While testing circuit-breaker panels: Fit dummy plugs on all sockets of the panel to be
tested.
➭ Earth and short-circuit all test sockets of the voltage detecting system.
➭ Switch all other three-position disconnectors to READY-TO-EARTH position.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable connection
bushing via test adapters.
✔ The rated short-duration power-frequency withstand voltage test can now be performed.

Performing the power- ➭ Apply 80 % of the rated short-duration power-frequency withstand voltage consecutively to
frequency voltage test phases L1, L2 and L3 for 60 seconds each.

Completing the power- ➭ Switch the voltage transformer disconnector of the disconnectable voltage transformers to
frequency voltage test CLOSED position.
➭ After the test, mount non-disconnectable voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200.

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25 Installation work with SF6 gas after the power-

frequency voltage test
If a rated short-duration power-frequency withstand voltage test has to be carried out at site,
the work with sulphur hexafluoride gas (SF6) described in this section must be performed
after the test.

DANGER
Danger of suffocation! SF6 gas is heavier than air and concentrates first near to the floor and in
floor openings.
➭ Do not let SF6 gas get into the environment.
➭ While working with SF6 gas, provide for sufficient ventilation.
➭ After working with SF6 gas, vent the cable basement and any hollows in the floors with
special care.
➭ Observe the safety data sheet for SF6 gas.

25.1 Installing solid-insulated bars at the panel connection,

and filling the circuit-breaker housings with SF6 gas
When solid-insulated bars are installed, the circuit-breaker housings are ventilated. The circuit-
breaker housings are already equipped with desiccant bags at the factory in order to eliminate
the residual humidity in the gas filling. In ambient air, the desiccant agent loses its
effectiveness rapidly.
To expose the desiccant bags as briefly as possible to the ambient air, the following work
operations are performed completely for one bar connection on one panel.

ATTENTION
Desiccant bags that have been fitted in the circuit-breaker housings at the factory are not
effective anymore if the housings remain open for more than half an hour.
➭ Replace desiccant bags in circuit-breaker housings that have been open for more than half
an hour.

Mounting ➭ Remove provisional cover from one of the circuit-breaker housings.

solid-insulated bars
➭ Write down the beginning of the ventilation time of the circuit-breaker housing.
➭ Prepare the flange of the solid-insulated bar and the connection flange of the circuit-breaker
housing for assembly.
➭ Mount solid-insulated bar. Tightening torque at the flange: 20 Nm.
➭ If the circuit-breaker housing was ventilated for more than half an hour, replace the
desiccant bags (see page 87, "Installing the panel connections supplied in the accessories,
and filling the circuit-breaker housing with SF6 gas").
➭ Evacuate the circuit-breaker housings and fill with SF6 gas
(see page 87, "Installing the panel connections supplied in the accessories, and filling the
circuit-breaker housing with SF6 gas").
➭ Repeat the above work operations for all other panel connections in the same panel.

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26 Installing voltage transformers

DANGER
The voltage transformer can explode!
➭ If the voltage transformer is short-circuited, there is risk of explosion!
Check the voltage transformer circuits up to the m.c.b. or the fuse for short-circuits.

DANGER
High voltage! Danger! Before starting installation work at the voltage transformers, the busbar
must have been isolated and earthed.
➭ Isolate and earth the busbar.
Verify safe isolation from supply.

ATTENTION
Sensitive parts of the switchgear may be damaged during installation work at the busbar and
the busbar housings.
➭ While working at the busbars or the busbar housings, prop up only on the aluminum
housings and the frame.
➭ Do not prop up on sensitive parts of the switchgear like gas pipes, bursting discs, shafts,
etc.

ATTENTION
While working on metal-coated voltage transformers, the coating may be scratched or
damaged. Then, the voltage transformers cannot be touched anymore.
➭ Work carefully while mounting metal-coated voltage transformers.
➭ Take care not to scratch or damage the metal coating.

ATTENTION
Risk of partial discharges at the voltage transformer bushings due to pollution.
➭ Clean all bushings at the panel at the voltage transformer carefully before starting
installation work.
➭ Observe extreme cleanliness while working.

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26.1 Installation of voltage transformers type 4MT3 on the busbar

① 4MT3 voltage transformer

② Low-voltage plug connector
③ Adapter plate
④ Voltage transformer
mounting plate
⑤ Busbar housing
⑥ Distance sleeves
⑦ Outside-cone bushing
⑧ Hole with setnut for press-out bolt

Fig. 100: 4MT3 busbar voltage transformer

(shown without cover)

➭ Isolate and earth the busbar.

➭ Verify safe isolation from supply.
➭ For first installation: Remove protective cap.
If available: Disassemble surge-proof caps of the outside-cone bushing.

➭ Clean the silicone adapter of the voltage transformer and the outside-cone bushing
carefully. Use a cleaning agent without solvents and a lint-free cloth.
➭ Grease the silicone adapter of the voltage transformer and the outside-cone bushing of
the voltage transformer mounting plate uniformly with mounting paste for cable sets.

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➭ If not yet pre-assembled, mount the adapter plate on the voltage transformer.

NOTE
The already assembled adapter plate can be displaced due to vibrations during transport.
To position the adapter plate correctly:
➭ Loosen the M8 bolts of the adapter plate a little bit.
➭ Bolt the adapter plate uniformly together with the voltage transformer mounting plate.
Tightening torque: 30 Nm.

① M8 bolts for fixing the adapter

plate on the voltage transformer
mounting plate
② Bushing for low-voltage plug
connector

➭ Insert the silicone adapter in the voltage transformer.

ATTENTION
Risk of partial discharges at the outside-cone bushing.
➭ Make sure that the connecting lug of the capacitive connecting point of the outside-cone
bushing is earthed.

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 Installation

➭ To let excess air out of the plug connection while mounting the voltage transformer,
fit a nylon thread or a cable strap into the inside cone of the silicone adapter in the voltage
transformer.

① Silicone adapter
② Cable strap
③ Outside-cone bushing

DANGER
Risk of injury! The voltage transformer type 4MT3 has a weight of approx. 30 kg.
➭ Secure the voltage transformer against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids.

➭ Lower the voltage transformer slowly onto the bushing, pulling the cable strap out of the
inside cone of the voltage transformer at the same time.

➭ Connect the low-voltage plug connector to the voltage transformer.

➭ Fasten the voltage transformer at the panel. To do this, bolt the voltage transformer
uniformly together with the voltage transformer mounting plate using four M8 bolts.
Tightening torque: 30 Nm.

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NOTE
To have the voltage transformer correctly seated on the voltage transformer mounting plate:
➭ Prevent the voltage transformer from canting during installation.

① Fixing bolts to connect the voltage transformer with the voltage transformer mounting plate

➭ Mount the cover of the voltage transformer using four bolts M6 x 12 and contact washers.
Tightening torque: 8 Nm.

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26.2 Installation of voltage transformers type 4MU4 on the busbar

① Low-voltage plug connector

② 4MU4 voltage transformer
③ Inside-cone bushing
④ Voltage transformer mounting plate
⑤ Intermediate ring
⑥ Busbar housing
⑦ Primary terminal at the voltage
transformer
⑧ Silicone adapter
⑨ Crane eye

Fig. 101: 4MU4 busbar voltage transformer

➭ Isolate and earth the busbar.

➭ Verify safe isolation from supply.
➭ Only for first installation: Remove protective cap.
➭ Remove the surge-proof dummy plug from the inside-cone bushing. To do this, undo the
three M8 hexagon socket-head bolts and remove the dummy plug.

① M8 bolts

Fig. 102: Removing the dummy plug

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Installation

➭ Insert one hexagon socket-head bolt M8x25 (with pan head) each into the now free holes.

Fig. 103: Inserting hexagon socket-head bolts

➭ Clean the silicone adapter and the inside-cone cast-resin socket carefully. Use a cleaning
agent without solvents and a lint-free cloth.
➭ Grease the silicone adapter and the inside-cone cast-resin socket uniformly with mounting
paste for cables sets.

Fig. 104: Cleaning and greasing the silicone adapter Fig. 105: Greasing and cleaning
the inside-cone cast-resin socket

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ATTENTION
Risk of injury! The voltage transformer type 4MU4 has a weight of approx. 60 kg.
➭ Secure the voltage transformer against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids
(e.g. a supporting rod).

➭ Lower the voltage transformer slowly onto the busbar housing.

① Cable strap

Fig. 106: Mounting the voltage transformer

➭ To let excess air out of the plug connection while mounting the voltage transformer, fit a
nylon thread or a cable strap into the inside cone of the voltage transformer mounting plate.
➭ Insert the primary terminal of the voltage transformer slowly into the inside cone of
the mounting plate, pulling the cable strap out at the same time.
➭ Connect the low-voltage plug connector to the voltage transformer.
➭ Fasten the voltage transformer at the panel. To do this, bolt the voltage transformer
uniformly together with the voltage transformer mounting plate using four M8 bolts.
Tightening torque: 30 Nm.

Fig. 107: Fixing the voltage transformer

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Installation

26.3 Installation of voltage transformers type 4MT7 at the cable feeder

① Panel connection housing

② Inside-cone bushing for primary terminal of transformer
③ Primary terminal at the voltage transformer
④ Silicone adapter
⑤ Fixing bracket (fastened to the voltage transformer housing)
⑥ 4MT7 voltage transformer
⑦ Low-voltage plug connector
⑧ Inside-cone bushing for cable
⑨ Panel connection cover

Fig. 108: 4MT7 voltage transformer

➭ Isolate and earth the cable feeder.

➭ Verify safe isolation from supply.
➭ For first installation of the voltage transformer, mount the threaded rods M10 with low-
design nuts (flat nuts) according to DIN 4035 on the panel connection cover (installation
instruction enclosed with the supplementary equipment).

① Panel connection housing

② Panel connection cover
③ M10 nuts acc. to DIN 4035
④ Threaded rods M10
Note: Nuts ③ and threaded
rods ④ are included in the
supplementary equipment

Fig. 109: Mounting the threaded rods

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➭ For first installation: Remove protective cap.

If available: Disassemble surge-proof dummy plugs of the inside-cone bushings.
To do this, undo the two sets of three M8 bolts.

Fig. 110: Removing surge-proof dummy plugs

➭ Clean the silicone adapter and the inside-cone cast-resin socket carefully. Use a cleaning
agent without solvents and a lint-free cloth.
➭ Grease the silicone adapter and the inside-cone cast-resin socket uniformly with mounting
paste for cables sets.

Fig. 111: Greasing the silicone adapter Fig. 112: Greasing the inside-cone
cast-resin socket
① Inside-cone bushing for plug-in cable connection
② Inside-cone bushing for primary terminal of transformer

DANGER
Risk of injury! The voltage transformer type 4MT7 has a weight of approx. 35 kg.
➭ Secure the voltage transformer from below against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids.
➭ If necessary, support the voltage transformer with a suitable facility.

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Installation

➭ Lower the primary terminal of the voltage transformer slowly onto

the panel connection housing.

① Cable strap

Fig. 113: Mounting the voltage transformer

➭ To let excess air out of the plug connection while mounting the voltage transformer,
fit a nylon thread or a cable strap into the inside cone of the panel connection cover.
➭ Insert the primary terminal of the voltage transformer slowly into the inside cone of the
panel connection cover, pulling the cable strap out at the same time.
➭ Fit plain washers on the threaded rods of the fixing bracket stecken. Bolt the voltage
transformer uniformly together with the panel connection cover using the M10 nuts.
Tightening torque: 30 Nm.

Fig. 114: Bolting the voltage transformer together

➭ Connect the low-voltage plug connector to the voltage transformer.

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27 Removal of voltage transformers

DANGER
High voltage! Danger! Before starting installation work at the busbar voltage transformers, the
busbar must have been isolated and earthed.
➭ Isolate and earth the busbar.

ATTENTION
If a power-frequency voltage test has to performed before putting the switchgear into
operation,
➭ already mounted non-disconnectable busbar voltage transformers which are not suitable
at least for tests at 80% values according to IEC 62271-200 must be removed.

ATTENTION
Sensitive parts of the switchgear may be damaged during installation work at the busbar and
the busbar housings.
➭ While working at the busbars or the busbar housings, prop up only on the aluminum
housings and the frame.
➭ Do not prop up on sensitive parts of the switchgear like gas pipes, bursting discs, shafts,
etc.

ATTENTION
While working on metal-coated voltage transformers, the coating may be scratched or
damaged. Then, the voltage transformers cannot be touched anymore.
➭ Work carefully while mounting metal-coated voltage transformers.
➭ Take care not to scratch or damage the metal coating.

27.1 Removal of voltage transformers type 4MT3 from the busbar

① 4MT3 voltage transformer

② Low-voltage plug connector
③ Adapter plate
④ Voltage transformer
mounting plate
⑤ Busbar housing
⑥ Distance sleeves
⑦ Outside-cone bushing
⑧ Hole with setnut for
press-out bolts

Fig. 115: 4MT3 busbar voltage transformer

(shown without cover)

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➭ Isolate and earth the busbar.

➭ Verify safe isolation from supply.
➭ Remove the low-voltage plug connector at the voltage transformer.
➭ Remove the cover of the voltage transformer.

➭ Remove the fixing bolts of the adapter plate.

➭ Screw four press-out bolts into the holes provided for this purpose in the adapter plate.
➭ Press the voltage transformer out of the bushing together with the adapter plate with
the help of the press-out bolts. While doing so, screw the press-out bolts in uniformly,
so that the transformer is not canted.

① Fixing bolts at
the adapter plate
② Holes with setnut for
press-out bolts

ATTENTION
Risk of injury! While being removed from the bushing, the voltage transformer can detach
suddenly.
➭ Remove the voltage transformer upwards as uniformly as possible.
➭ Do not use excessive force.

ATTENTION
Risk of injury! The voltage transformer type 4MT3 has a weight of approx. 30 kg.
➭ Secure the voltage transformer against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids.

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NOTE
If you remove the voltage transformer, the silicone adapter may fall out of the voltage
transformer.
➭ Keep the silicone adapter carefully for later use.

➭ Clean the silicone adapter and the outside-cone bushing carefully using a cleaning agent
without solvents and a lint-free cloth.
➭ Protect the connection socket of the voltage transformer against damages and pollution
using a suitable cover.
➭ For voltage tests: Close the outside-cone bushing at the busbar housing with a surge-proof
cap and protect it against damages and pollution.

27.2 Removal of voltage transformers type 4MU4 from the busbar

➭ Isolate and earth the busbar.
➭ Verify safe isolation from supply.
➭ Remove the low-voltage plug connection.
➭ Remove the 4 fixing bolts M8x35 of the fixing brackets at the voltage transformer
mounting plate.

Fig. 116: Removing the fixing bolts at the voltage transformer mounting plate

➭ Lift the voltage transformer at the upper crane eyes using a suitable rod (e.g. steel rod).

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ATTENTION
Risk of injury! While being removed from the bushing, the voltage transformer can detach
suddenly.
➭ Remove the voltage transformer upwards as uniformly as possible.
➭ Do not use excessive force.

ATTENTION
Risk of injury! The voltage transformer type 4MU4 has a weight of approx. 60 kg.
➭ Secure the voltage transformer against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids
(e.g. a supporting rod).

➭ Remove the voltage transformer slowly upwards by means of the steel rods.
➭ Lower the transformer so that it does not lie on the primary terminal, and protect it against
damages and pollution using a suitable cover.
➭ For voltage tests: Close the inside-cone bushing at the panel with
a surge-proof dummy plug size 2.
To do this, remove the 3 bolts M8x25. Store these bolts carefully. Fit the dummy plug and
bolt together with 3 bolts M8.

Fig. 117: Removing bolts M8x25

① M8 bolts

Fig. 118: Inserting the dummy plug

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27.3 Removal of voltage transformers type 4MT7 from the cable feeder

① Panel connection housing

② Inside-cone bushing for primary
terminal of transformer
③ Primary terminal at the voltage
transformer
④ Silicone adapter
⑤ Fixing bracket (fixed at the voltage
transformer housing)
⑥ 4MT7 voltage transformer
⑦ Low-voltage plug connection
⑧ Inside-cone bushing for cable
⑨ Panel connection cover

Fig. 119: 4MT7 voltage transformer

➭ Isolate and earth the cable feeder.

➭ Verify safe isolation from supply.
➭ Remove the voltage transformer. To do this, remove the 4 bolts of the fixing brackets at
the panel connection cover, bolt size M10.

Fig. 120: Removing the voltage transformer

ATTENTION
Risk of injury! While being removed from the bushing, the voltage transformer can detach
suddenly.
➭ Remove the voltage transformer uniformly downwards.
➭ Do not use excessive force.

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Installation

ATTENTION
Risk of injury! The voltage transformer type 4MT7 has a weight of approx. 35 kg.
➭ Secure the voltage transformer against falling down.
➭ If necessary, transport the voltage transformer with several persons or with suitable aids.
➭ If necessary, support the voltage transformer with a suitable facility.

➭ Remove the voltage transformer slowly downwards.

➭ Lower the voltage transformer so that it does not lie on the primary terminal, and protect it
against damages and pollution using a suitable cover.
➭ For voltage tests: Close the inside-cone bushings at the switchpanel pole with surge-proof
dummy plugs size 2 (3), and bolt tight using 3 bolts M8 each.

Fig. 121: Mounting surge-proof dummy plugs

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28 Busbar components

28.1 Voltage transformer damping resistor

The damping resistor of the voltage transformer is pre-assembled at the factory.
➭ Do not damage the damping resistor while working at the busbar.

① Fixing bracket of damping resistor

② Damping resistor
③ Voltage transformer mounting plate

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Installation

28.2 Voltage transformer with or without three-position disconnector

Voltage transformer with three-position disconnector

(for example, 4MU4 voltage transformer)

Fig. 122: Overview of busbar component: 4MU4 voltage transformer

with three-position disconnector
① Low-voltage plug connector
② 4MU4 voltage transformer
③ Crane eyes
④ Voltage transformer mounting plate
⑤ Intermediate ring
⑥ Operating unit
⑦ Busbars
⑧ Busbar housing

For assembly operations for 4MU4 voltage transformer, see page 101, "Installation of voltage
transformers type 4MU4 on the busbar".

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Voltage transformer without three-position disconnector

(for example, 4MU4 voltage transformer)

Fig. 123: Overview of busbar component: 4MU4 voltage transformer

without three-position disconnector
① Low-voltage plug connector
② 4MU4 voltage transformer
③ Crane eyes
④ Voltage transformer mounting plate
⑤ Intermediate ring
⑥ Busbars
⑦ Busbar housing

For assembly operations for 4MU4 voltage transformer, see page 101, "Installation of voltage
transformers type 4MU4 on the busbar".

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Installation

28.3 Solid-insulated bar (V-type bar)

Solid-insulated bar with three-position disconnector

Fig. 124: Overview of busbar component: Solid-insulated bar

with three-position disconnector
① Solid-insulated bar with integrated pressure ring
② Connection housing for solid-insulated bar
③ Busbar housing
④ Busbars

➭ Remove the covers ① and sealing rings. To do this, remove the 6 bolts M8 x 45
(including washer and spring washer) and the M10 nuts.

Fig. 125: Removing the covers ① and sealing rings

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➭ Mount solid-insulated bar.

① Solid-insulated bar with integrated

pressure ring ( ② )
② Pressure ring
③ Contact bolt
④ Sealing ring
⑤ Connection cover for solid-insulated bar

Fig. 126: Solid-insulated bar

➭ Bolt the pressure ring of the solid-insulated bar together with the busbar housing using
6 bolts M8 x 45 (including washer and spring washer). Tightening torque: 20 Nm.

① Solid-insulated bar
② Pressure ring
③ Connection cover for solid-insulated bar
④ Busbar housing

Fig. 127: Fixing points for the pressure ring

of the solid-insulated bar

➭ The solid-insulated bar is disassembled in reverse order: Remove the bolts at the pressure
ring of the solid-insulated bar. Remove the solid-insulated bar and bolt the cover onto
the connection housing.

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Installation

Solid-insulated bar without three-position disconnector

Fig. 128: Overview of busbar component: Solid-insulated bar

without three-position disconnector
① Solid-insulated bar with integrated pressure ring ( ② )
② Pressure ring
③ Busbars
④ Busbar housing

➭ Remove the covers ① . To do this, remove the 6 bolts M8 x 45 (including washer and spring
washer) and nuts M10.

Fig. 129: Removing the covers ①

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➭ Mount solid-insulated bar.

① Solid-insulated bar with

integrated pressure ring
② Pressure ring
③ Contact bolt
④ Connection cover for
solid-insulated bar

Fig. 130: Mounting solid-insulated bars

➭ Bolt the pressure ring of the solid-insulated bar together with the busbar housing using
6 bolts M8 x 45 (including washer and spring washer). Tightening torque: 20 Nm.

① Solid-insulated bar
② Pressure ring
③ Connection cover for solid-insulated bar
④ Busbar housing

Fig. 131: Fixing points for the pressure ring

of the solid-insulated bar

➭ The solid-insulated bar is disassembled in reverse order: Remove the bolts at the pressure
ring of the solid-insulated bar. Remove the solid-insulated bar and bolt the cover onto
the connection cover.

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Installation

28.4 Gas-insulated bar

Gas-insulated bar with three-position disconnector

Fig. 132: Overview of busbar component: Gas-insulated bar

with three-position disconnector
① Gas-insulated bar with integrated pressure ring
② Connection housing for gas-insulated bar
③ Busbars
④ Busbar housing

➭ Remove the covers ① . To do this, remove the 8 bolts M8 x 20 and the nuts.
Reuse the bolts for fixing the gas-insulated bar.

Fig. 133: Removing the covers ①

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➭ Mount the gas-insulated bar.

① Gas-insulated bar
(with integrated pressure ring ② )
② Pressure ring
③ Sealing ring
④ Connection housing

➭ Bolt the pressure ring of the gas-insulated bar together with the busbar housing
using 8 bolts M8 x 20. Tightening torque: 20 Nm.

① Gas-insulated bar
② Pressure ring
③ Connection housing
④ Busbar housing

Fig. 134: Fixing points for the pressure ring

of the gas-insulated bar

➭ The gas-insulated bar is disassembled in reverse order: Remove the bolts at the pressure ring
of the gas-insulated bar. Remove the gas-insulated bar and bolt the cover onto
the connection housing.

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Gas-insulated bar without three-position disconnector

Fig. 135: Overview of busbar component: Gas-insulated bar

without three-position disconnector
① Gas-insulated bar with integrated pressure ring ( ② )
② Connection housing for gas-insulated bar
③ Intermediate ring
④ Busbars
⑤ Busbar housing

➭ Remove the covers ① . To do this, remove the 8 bolts M8 x 20 and the nuts.
Reuse the bolts for fixing the gas-insulated bar.

Fig. 136: Removing the covers ①

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➭ Mount the gas-insulated bar.

① Gas-insulated bar
(with integrated pressure ring ② )
② Pressure ring
③ Sealing ring
④ Connection housing

➭ Bolt the pressure ring of the gas-insulated bar together with the busbar housing using
8 bolts M8 x 20. Tightening torque: 20 Nm.

① Gas-insulated bar
② Pressure ring
③ Connection housing
④ Busbar housing

Fig. 137: Fixing points for the pressure ring of

the gas-insulated bar

➭ The gas-insulated bar is disassembled in reverse order: Remove the bolts at the pressure ring
of the gas-insulated bar. Remove the gas-insulated bar and bolt the cover onto the
connection housing.

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Installation

28.5 Busbar connection S2 and S3

Busbar connection with plug size S2 or S3 and with three-position disconnector

Fig. 138: Overview of busbar component:

Busbar connection with plug size S2 or S3 and with three-position disconnector
① Busbar connection with plug size 2 or 3
② Intermediate ring
③ Operating unit for busbar systems 1 and 2
④ Busbars
⑤ Busbar housing

The busbar connection S2 or S3 with three-position disconnector is pre-assembled

at the factory.

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Busbar connection with plug size S2 or S3 without three-position disconnector

Fig. 139: Overview of busbar component:

Busbar connection with plug size S2 or S3 without three-position disconnector
① Busbar connection with plug size S2 or S3
② Busbar housing
③ Busbars

The busbar connection S2 or S3 is pre-assembled at the factory.

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Installation

28.6 Busbar earthing switch

Busbar earthing switch

Fig. 140: Overview of busbar component: Busbar earthing switch

① Housing for busbar earthing switch
② Additional compartment for operating mechanism of busbar earthing switch
③ Busbars
④ Busbar housing

The busbar earthing switch is pre-assembled at the factory.

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28.7 Capacitive voltage tap at the busbar

Fig. 141: Overview of busbar component: Capacitive voltage tap

① Dummy plug
② Capacitive voltage tap
③ Panel connection housing
④ Busbars
⑤ Busbar housing

The capacitive voltage tap at the panel connection housing is pre-assembled at the factory.

NOTE
Visual inspection of the dummy plugs
➭ Verify that all dummy plugs ( ① ) are properly inserted in the capacitive voltage taps.

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29 Tests

29.1 Checking the SF6 gas filling

DANGER
Operation with an incorrect SF6 gas pressure can destroy parts of the switchgear.
➭ Do not put the switchgear into operation with too high or too low SF6 gas pressures.

Checking the gas pressure Before commissioning or a rated short-duration power-frequency withstand voltage test,
the gas pressures of all gas compartments must be checked.
➭ On all gas compartments filled at site: After having filled the gas compartments, observe a
temperature compensation time of 24 hours. Do not check the gas pressure before that
time.
➭ Check the gas pressure in all gas compartments filled at site. If the limit values adjusted on
the indicators are underflown or exceeded, correct the gas pressure.

Leakage test ➭ 24 hours after having filled the gas compartments, check all flange connections mounted at
site and all SF6 pipes for leaks.
➭ For leak detection, use an SF6 leak detector.
➭ In case of gas leaks, these points must be disassembled and sealed again.

Checking the gas quality ➭ Check the gas quality 24 hours after filling the gas compartments.
➭ Determine the maximum dew point with a gas hygrometer.
Dew-point temperature: -15oC.
➭ Check the air content in the SF6 gas with a gas-percentage meter.
Maximum air content: 5%.
➭ If the gas quality is not achieved, the gas filling must be cleaned with the maintenance unit.

Monitoring the gas ➭ After commissioning, check the gas pressures daily for a period of two weeks. If the gas
pressure pressures drop within this period of time, please inform the Siemens representative.

➭ After this period of time, check the gas pressures according to the maintenance instructions.

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29.2 Monitoring the gas pressure

The perfect functioning of the switchgear is only guaranteed if the gas pressure indication is
between the minimum and the maximum functional level (see page 44, "Insulating gas SF6").

① Manometers of the SF6 gas

compartments for busbars L1, L2, L3 of
busbar system 1
② Manometers of the SF6 gas
compartments for busbars L1, L2, L3 of
busbar system 2
③ Manometer for three-position
disconnector housing in busbar
system 2
④ Manometer for circuit-breaker housing
⑤ Manometer for three-position
disconnector housing in busbar
system 1

Fig. 142: Gas pressure manometers at the panel

① Minimum permissible functional level

(signaling contact)
② Critical gas pressure (signaling contact)
③ Actual gas pressure
④ Maximum permissible functional level
(signaling contact)

Fig. 143: Gas pressure manometer for

the circuit-breaker housing at the panel

DANGER
If gas pressure is beyond the minimum or maximum functional level:
➭ Contact the regional Siemens representative immediately.
➭ Shut down the circuit-breaker panel if required.

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Installation

29.3 Checking the circuits of the low-voltage equipment

DANGER
The voltage transformer can explode!
➭ If the voltage transformer is short-circuited, there is risk of explosion.
Check the voltage transformer circuits up to the m.c.b. or the fuse for short-circuits.

➭ Check the current transformer circuits according to the circuit diagrams.

➭ Check the functions of all protection devices with a secondary test unit for relays.

29.4 Checking high-voltage connections

➭ Check the tightening torque of the fixing bolts of the cable plugs according to the
manufacturer's instructions.
➭ Check the earthing of the cable termination on all high-voltage cables.

29.5 Checking electrical connections

Checking device ➭ Check the screw-type connections of the devices in the low-voltage compartment at
connections random with the torque wrench.
➭ Check the plug-in connections of the devices in the low-voltage compartment at random.

Checking auxiliary cable ➭ Check auxiliary cable connections on devices and terminal blocks at random.
connections
➭ Check all auxiliary cable connections on current transformer terminals including slides and
jumpers in the low-voltage compartment.
➭ Check the designation labels on the terminal blocks.
➭ Replace missing labels using the information given in the circuit diagrams.

29.6 Checking protection against environmental influences

For touching up doors and front parts there is a paint pen available.
➭ Touch up surface damages.

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30 Final installation work

30.1 Mounting cables with plugs

ATTENTION
The dust-proof caps supplied on the sockets of the multiple panel connections do not provide
sufficient shock protection.
➭ Close unused sockets of multiple panel connections with dummy plugs.

➭ Proceed according to the installation instructions of the corresponding plug manufacturer.

➭ Mount the cable bracket (option). Distance between lower edge of panel connection
housing and cable bracket: Minimum 450 mm.

ATTENTION
Do not bolt cable shields onto panel connection housings in order to avoid damage to the
switchgear.
➭ Connect cable shields to the cable bracket or to the switchgear earth.

30.2 Connecting low-voltage cables

Connect low-voltage cables of customer (option):
➭ Remove the metal covers from the frames.
➭ Open the doors of the low-voltage compartments.
➭ Fix the low-voltage cables at the holders provided for this purpose.
➭ Connect the ends of the cables to the terminals in the low-voltage compartment according
to the circuit diagram.
➭ Close the doors of the low-voltage compartments.

Fig. 144: Fixing of low-voltage cables

① Fixing of low-voltage cables at the upper front support
② Fixing of low-voltage cables at the lower front support
③ Low-voltage cables

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Installation

Connecting the STG plug with the VBSTB4 modular terminal

For 2-, 4- and 10-pole STG plugs make PHOENIX CONTACT, observe the instructions for
installation and removal described hereafter.

NOTE
The information stated herein refer to the user instructions of PHOENIX CONTACT. The user is
obliged to inform himself about the latest state of the instructions for installation or removal of
the STG plugs, and to observe the manufacturer's instructions.
➭ Manufacturer's site: https://www.phoenixcontact.com

Mounting the STG plug ➭ Hold the STG plug horizontally over the plug shaft of the VBSTB4 modular terminal.
➭ Push the STG plug horizontally into the modular terminal until the STG plug latches in.

✔ The STG plug is latched into the modular terminal and mounted.
Removing the STG plug ➭ Push the STG plug slightly to the screwing side until the latching noses come out of
the latching slots of the modular terminal.

➭ Pull the STG plug horizontally out of the VBSTB4 modular terminal.

✔ The STG plug is removed.

30.3 Mounting the metal covers
➭ Screw all metal covers to the frames again.

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31 Installation of degree of protection version IP31D

① Protection plate for left end panel

② Sealing strip for intermediate panels
③ Protection plate for intermediate panels
④ Protection plate for right end panel
⑤ Sealing tape between the individual
panels, and between roof plate and
protection plate

Fig. 145: Overview: Degree of protection version IP31 for panels

31.1 IP31D - protection against vertically falling water drops

Mounting protection ➭ On the roof plates of the panels, the sealing tape was pre-assembled at the factory.
plates (if not pre-
➭ Mount protection plates for intermediate and end panels. To do this, use bolts M6 x 25.
assembled at the factory)

① Protection plate for left end panels

(6 bolts M6 x 25)
② Protection plate for intermediate
panels (6 bolts M6 x 25)
③ Sealing tape

Fig. 146: Example: Fastening protection plate for end panel and intermediate panel

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Installation

➭ Protect the junction edges of panels with additional sealing strips .

Attach a sealing tape under the sealing strip.

① Sealing strip (4 bolts M6 x 25)

② Sealing tape

Fig. 147: Example: Fastening the sealing strip

on the junction edge between two panels

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 Installation

32 Installation of rear walls of switchgear

➭ Fasten the fixing cross members at the retainers and the busbar housings using 2 bolts
M8 x 30 each. Tightening torque: 20 Nm.

ATTENTION
If higher busbar housings with disconnectable feeders to the top are mounted on intermediate
and end panels:
➭ Turn the fixing cross member for installation by 180°.

Fig. 148: Mounting fixing cross members on busbar housings

① Fixing cross members for right and left end panels
② The fixing cross member for intermediate panels is identical with the fixing cross member for end
panels. However, the fixing cross member is turned by 180° if a higher busbar housing with a
disconnectable feeder to the top was mounted.

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Installation

➭ Mount the retainers for the rear walls. To do this, use 24 bolts M6 x 12.
Tightening torque: 12 Nm.

Fig. 149: Bolting points for the retainers

① Fixing cross members
② Subframe

Fig. 150: Retainers for the rear walls

①,② Retainer for ③ Retainer for left end panels (retainer for
intermediate panels right end panels is not shown here)

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➭ Bolt the lower rear walls together with the retainers. Use 8 bolts M6 x 12 for each rear wall.
Tightening torque: 12 Nm.

Fig. 151: Mounting lower rear walls

➭ Bolt the upper rear walls together with the retainers.

Use 10 bolts M6 x 12 for each rear wall. Tightening torque: 12 Nm.

Fig. 152: Mounting upper rear walls

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Installation

33 Installation of end walls

As-delivered condition of panel:

Fig. 153: As-delivered condition

➭ Tighten rear end cover.

Fig. 154: Fixing points of rear end cover

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➭ Hang in the lower arc-resistant protection walls, and fix loosely using bolts.

Fig. 155: Fixing points for lower arc-resistant protection walls, at the frame connection

➭ Hang in the upper arc-resistant protection walls, and fix loosely using bolts.

Fig. 156: Fixing points for upper arc-resistant protection walls

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Installation

➭ Slide the cross bracing between the end covers and the arc-resistant protection walls,
and tighten it.

Fig. 157: Fixing points for cross bracing

➭ Tighten the bolted joints of the upper and lower arc-resistant protection walls.
➭ Fasten short air guide from inside and long air guide from outside.

Fig. 158: Mounting direction for short air guide and long air guide

Fig. 159: Fixing points for short air guide

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Fig. 160: Fixing points for long air guide

➭ Mount central support.

Fig. 161: Fixing points of central support

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Installation

➭ Mount lower end wall.

Fig. 162: Fixing points of lower end wall (close the drill holes identified with ① using
stoppers)

➭ Mount upper end wall.

Fig. 163: Fixing points for upper end wall

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34 Commissioning

34.1 Checking the installation work

➭ Carry out a final check to make sure that all installation work has been performed according
to these installation instructions (see page 50, "Installation").

34.2 Test operation

Read the operating instructions before the test operation. Test operation helps you to verify
the perfect operation of the switchgear without high voltage.
The work described below must be performed on each panel.

DANGER
Operating the switchgear under high voltage for test can destroy the switchgear and cause
personal injuries.
➭ Switch off high voltage before test operation.

ATTENTION
If defective or incorrectly assembled switchgear is put into operation, this can damage or
destroy parts of the switchgear.
➭ Never put switchgear into operation if you notice during test operation that a part of it
does not work as described in here.

Mechanical operation of
switching devices
DANGER
Charging the circuit-breaker operating mechanism by hand can cause injuries due to the
suddenly starting motor operating mechanism.
➭ Charge the circuit-breaker mechanism with the supplied original hand crank with
freewheel only.

➭ All auxiliary and control voltages are switched off.

➭ Charge the circuit-breaker operating mechanism by hand.

① Hand crank
② "Closing spring not
charged" indication
③ "Closing spring
charged" indication

➭ Close and open the circuit-breaker.

➭ Close and open the busbar earthing switch several times.

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Installation

Electrical operation of ➭ Switch on all auxiliary and control voltages. The motor must start up automatically
switching devices immediately after, in order to charge the closing spring in the circuit-breaker
operating mechanism.
➭ Close and open the circuit-breaker several times. The motor charges the closing spring
automatically after every closing operation.
➭ Close and open the disconnectors and earthing switches several times.

Checking interlocks All circuit-breakers, disconnectors and earthing switches are closed and opened,
and indicators checking the interlocks and indicators at the same time.
➭ Operate all switching devices for test to verify the perfect operation of all mechanical and
electromechanical interlocks. Do not use force.
➭ Check correct indication on position indicators at the front of the panels and
in the control room.

Completing test operation ➭ Switch the circuit-breakers, disconnectors and earthing switches to OPEN position.

Activating The undervoltage releases mounted in the circuit-breaker must be activated.

undervoltage release
The circuit-breaker operating mechanism is located in the central part of the panel behind
the ON/OFF pushbuttons.

DANGER
Risk of injury by release of charged operating springs when the front plate of the operating
mechanism is removed! Bruises or cuts at the hands can be the consequence.
➭ To avoid impermissible switching operations, switch off auxiliary voltage.
➭ To discharge the spring energy store in the operating mechanism, perform the following
operations before removing the cover:
- Trip the miniature circuit-breaker.
- Actuate the OFF pushbutton.
- Actuate the ON pushbutton.
- Actuate the OFF pushbutton.
- Disconnect the control cables from the low-voltage compartment.

➭ The spring energy store indicator must show "spring not charged".

➭ Remove the circuit-breaker front cover.

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➭ Shift the retaining screw of the striker from position A to position B to activate
the undervoltage release.

➭ Close the operating mechanism box and refit the cover.

✔ The circuit-breaker operating mechanism is now ready for operation with undervoltage
release.

34.3 Checking the accessories

The switchgear accessories comprise:
• Operating levers
• Keys to operate the switching devices
• Single-line diagrams
• Operating instructions
• Warning signs
• Customer-specific consignments.

➭ Make the switchgear accessories available in the switchgear room or in a neighboring room
clearly and ready to hand.
➭ Check the accessories in the service flap (option).

34.4 Correcting circuit diagrams

➭ Note any modifications which may have been made during installation or commissioning in
the supplied circuit diagrams.
➭ After completion of the installation work, ask the regional Siemens representative for
correction of the original circuit diagrams.

34.5 Instructing the operating personnel

➭ Hand over the operating instructions to the operating personnel before commissioning.
➭ Make the operating personnel familiar with all technical details and operation of the
switchgear before switchgear acceptance.

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Operation

Operation
DANGER
The internal arc classification of the switchgear according to IEC 62271-200 has only been
proved by tests for the switchgear sides with internal arc classification and with closed
high-voltage compartments.
➭ Determine the IAC classification of the switchgear by means of the data on the rating plate
(see page 48, "Rating plates").
➭ Regulations for access to switchgear areas without internal arc classification according to
IEC 62271-200 must be defined by the entrepreneur or the switchgear operator.

35 Control elements and indicators

Overview

① Manometers of the SF6 gas compartments for busbars L1, L2, L3 of

busbar system 1
② Manometers of the SF6 gas compartments for busbars L1, L2, L3 of
busbar system 2
③ Gas filling valve
④ "ON" pushbutton (mechanical), sealable and lockable by the customer
⑤ "OFF" pushbutton (mechanical), sealable and lockable by the customer
⑥ Locking device
⑦ Sockets for voltage detecting system
⑧ Counter for operating cycles
⑨ Position indicator for circuit-breaker "CLOSED"/"OPEN"
⑩ "Closing spring charged / not charged" indicator
⑪ Opening for hand crank for charging the circuit-breaker closing spring
⑫ Selector gate for busbar system
⑬ Control and indication board for three-position disconnector operating
mechanism
⑭ Gas filling valve
⑮ Manometer for three-position disconnector housing in busbar system 1
⑯ Manometer for circuit-breaker housing
⑰ Manometer for three-position disconnector housing in busbar system 2

Fig. 164: Switchgear front ⑱ Low-voltage compartment

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Operating tools The operating levers for the three-position disconnector functions DISCONNECTING and
READY-TO-EARTH have a slot and a nose, which are arranged in such a way that the levers can
only be used for their respective function. The emergency operating lever only has a slot and
may exclusively be used as described (see page 159, "Emergency operation of
the three-position disconnector") .

Fig. 165: Operating lever for Fig. 166: Operating lever for
DISCONNECTING function READY-TO-EARTH function
(cross bar marked red)

Fig. 167: Adapter for emergency operation Fig. 168: Hand crank for
(to be used only with charging the closing spring
motor operating mechanism)

Fig. 169: Double-bit key 3 mm

(door of low-voltage compartment

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Operation

36 Circuit-breaker operation

ATTENTION
Operating the circuit-breaker locking device in the OPEN or CLOSED positions can damage
the switchgear.
➭ Operate the circuit-breaker locking device only in the EARTHED position, and padlock it.

Circuit-breaker
control board
① ON pushbutton
② OFF pushbutton
③ "Feeder earthed“ locking device
④ Operations counter
⑤ Position indicator for
circuit-breaker
⑥ "Closing spring charged / not
charged“ indicator
⑦ Opening to charge
the closing spring manuallly

Fig. 170: Circuit-breaker control board

36.1 Closing the circuit-breaker manually

Preconditions • "Feeder earthed" locking device is open

• Closing spring is charged

➭ Operate the ON pushbutton in the circuit-breaker control board.

✔ The position indicator changes to "I" position. The circuit-breaker is closed.

36.2 Opening the circuit-breaker manually

If the control voltage fails, the circuit-breaker can only be opened mechanically by hand.

NOTE
OFF signals ineffective
➭ If the feeder is earthed through the three-position disconnector and the circuit-breaker,
all electrical OFF signals are ineffective.

Preconditions • "Feeder earthed" locking device is open

DANGER
If the "feeder earthed" locking device is padlocked, the circuit-breaker cannot be opened,
neither electrically nor mechanically.
➭ Fit the padlock only if the feeder is earthed.

➭ Operate the OFF pushbutton in the circuit-breaker control board.

✔ The circuit-breaker is open.

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36.3 Emergency release of the circuit-breaker

Interlocking of the "feeder earthed" function between circuit-breaker and
three-position disconnector:
• Possible in all switch positions of the three-position disconnector.

Or:
• Only possible in three-position disconnector OPEN position.

ATTENTION
If the auxiliary voltage fails, the "feeder earthed" locking device is blocked.
➭ Operate emergency release.

① "Feeder earthed“ locking device

② Opening for emergency release

Fig. 171: Position of opening for emergency release

at the circuit-breaker front

➭ Insert a suitable auxiliary means (e.g. a very small screwdriver) in the release opening as far
as it will go, and push softly to the left. Push the lever of the locking device upwards and
remove the auxiliary means.

Fig. 172: Operating the emergency release

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Operation

36.4 Recommendation for sealing the pushbuttons

ATTENTION
If you close manually, all electrical and mechanical interlocks are ineffective.
➭ To guarantee safe operation of the interlocks: Seal/lock the pushbuttons (see table below).

Recommendation for
sealing/locking Panel types Sealing
Incoming or outgoing feeder panels ON pushbutton
Bus sectionalizer panels ON pushbutton and OFF pushbutton

36.5 Test operation without auxiliary voltage

On circuit-breakers with undervoltage release 3AX1103:

ATTENTION
If the retaining screw of the striker is not shifted back from position A to position B after
the test operation without auxiliary voltage, the undervoltage release will not function.
➭ After the test operation without auxiliary voltage, shift the retaining screw of the striker
back from position A to position B.

Perform the following actions to guarantee that the circuit-breaker is ready for operation:
➭ Charge the closing spring (see page 151, "Charging the closing spring manually").
➭ Operate the ON pushbutton in the circuit-breaker control board.
✔ The circuit-breaker is closed.

➭ Operate the OFF pushbutton in the circuit-breaker control board.

✔ The circuit-breaker is open.

➭ Shift the retaining screw of the striker from position A to B to activate

the undervoltage release.

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36.6 Test operation with auxiliary voltage (motor operating mechanism)

➭ Switch on the supply voltage.
✔ The motor operating mechanism starts up and charges the closing spring.

➭ Check whether the "closing spring charged" indication appears.

➭ Operate the ON pushbutton in the circuit-breaker control board.

✔ The closing spring is charged by the motor.

➭ Check whether the position indication "circuit-breaker CLOSED" appears.

➭ Operate the OFF pushbutton in the circuit-breaker control board.
➭ Check whether the position indication "circuit-breaker OPEN" appears.

36.7 Charging the closing spring manually

The closing spring is charged by the motor after applying control voltage. The energy required
for the operating sequence OPEN-CLOSED-OPEN (auto-reclosing) is stored in the closing
spring about 15 seconds after closing the circuit-breaker.

Fig. 173: "Closing spring charged" Fig. 174: "Closing spring not charged"
indication indication

The hand crank is required to charge the closing spring manually if the control voltage fails.

DANGER
Risk of injury by sudden rotation of hand crank. If you use a hand crank without a freewheel
to charge the spring, the hand crank will rotate when the control voltage is switched on again
(motor starts up) and can lead to injury.
➭ Use special hand crank with freewheel from the accessories.

➭ Remove cover from cutout.

➭ Insert hand crank.
➭ Turn hand crank clockwise approx. 30 turns until the indication "closing spring charged"
appears.

➭ Remove hand crank.

➭ Close cutout with cover.

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Operation

37 Operating the three-position disconnector

The procedures described in this section apply to:
• Disconnectable voltage transformers or disconnectable busbar connections
• Top-mounted bus sectionalizer
• Switching operations on circuit-breaker panels
• Switching operations on bus sectionalizer panels
• Switching operations on bus coupler panels

37.1 Control elements and indicators

Control board on
the switchgear front

Fig. 175: Control board on the switchgear front

① Busbar system 1
② Busbar system 2
③ Control gate (three-position disconnector in busbar system 1)
④ Control gate (disconnector in busbar system 2)
⑤ Position indicator for disconnector in busbar system 2 (DISCONNECTING function)
⑥ Actuating opening for disconnector in busbar system 2 (DISCONNECTING function)
⑦ Selector gate for busbar system
⑧ Actuating opening for three-position disconnector in busbar system 1 (READY-TO-EARTH function)
⑨ Actuating opening for three-position disconnector in busbar system 1 (DISCONNECTING function)
⑩ Position indicator for circuit-breaker
⑪ Position indicator for three-position disconnector in busbar system 1 (DISCONNECTING function)
⑫ Position indicator for three-position disconnector in busbar system 1 (READY-TO-EARTH function)

The manual switching operations DISCONNECTING or READY-TO-EARTH must be pre-selected

with the interrogation lever. The interrogation lever can only be operated if the associated
switching operation is permissible.

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Position indicator The position of the three-position disconnector is indicated both at the front and at the rear of
at the rear the switchgear. The rear position indicator for busbar systems 1 and 2 is located at the side of
the disconnector housing.

Fig. 176: Rear position indicator at the disconnector housing for busbar system 1

Fig. 177: Rear position indicator at the disconnector housing for busbar system 2

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Operation

37.2 Closing the three-position disconnector manually

ATTENTION
In circuit-breaker panels, a mechanical interlock prevents the three-position disconnector from
being operated when the circuit-breaker is closed.
➭ Open the circuit-breaker (see page 148, "Opening the circuit-breaker manually").

ATTENTION
In disconnector panels without electromechanical/mechanical interlock, maloperation of
the three-position disconnector is possible. Here, the three-position disconnector can be
operated under load. Operating under load will destroy the three-position disconnector!
➭ Do not operate the three-position disconnector under load.

Fig. 178: Closing the three-position disconnector

➭ Pre-select busbar system for switching operation.

Selector gate to the left: Busbar system 1. Selector gate to the right: Busbar system 2.
➭ Push the left-hand control gate to the left.
✔ The opening for the DISCONNECTING function is free.

➭ Switch the three-position disconnector to CLOSED position (insert the operating lever for
the DISCONNECTING function and turn 180° clockwise).
✔ The three-position disconnector is closed.

✔ The position indicator changes to CLOSED position.

➭ Remove the operating lever for the DISCONNECTING function.

✔ The left-hand control gate returns to its initial position.

✔ The opening for the DISCONNECTING function is closed.

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37.3 Opening the three-position disconnector manually

Fig. 179: Opening the three-position disconnector

➭ Pre-select busbar system for switching operation.

Selector gate to the left: Busbar system 1. Selector gate to the right: Busbar system 2.
➭ Push the left-hand control gate to the left.
✔ The opening for the DISCONNECTING function is free.

➭ Switch the three-position disconnector to OPEN position (insert the operating lever for
the DISCONNECTING function and turn 180° counter-clockwise).
✔ The three-position disconnector is open.

✔ The position indicator changes to OPEN position.

➭ Remove the operating lever for the DISCONNECTING function.

✔ The left-hand control gate returns to its initial position.

✔ The opening for the DISCONNECTING function is closed.

37.4 Activating the ready-to-earth function manually

ATTENTION
In circuit-breaker panels, a mechanical interlock prevents the three-position disconnector from
being operated when the circuit-breaker is closed.
➭ Open the circuit-breaker (see page 148, "Opening the circuit-breaker manually").

ATTENTION
In disconnector panels without electromechanical/mechanical interlock, maloperation of the
three-position disconnector is possible. Here, the three-position disconnector can be operated
under load. Operating under load will destroy the three-position disconnector!
➭ Do not operate the three-position disconnector under load.

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Operation

Fig. 180: Operating the three-position disconnector for the READY-TO-EARTH function

➭ Pre-select busbar system for switching operation.

Selector gate to the left: Busbar system 1. Selector gate to the right: Busbar system 2 .
➭ Push the left-hand control gate to the right.
✔ The opening for the READY-TO-EARTH function is free.

➭ Switch the three-position disconnector to READY-TO-EARTH position (insert the operating

lever for the READY-TO-EARTH function and turn 180° clockwise).
✔ The earthing switch is closed.

✔ The position indicator changes to READY-TO-EARTH position.

➭ Remove the operating lever for the READY-TO-EARTH function.

✔ The left-hand control gate returns to its initial position.

✔ The opening for the READY-TO-EARTH function is closed.

DANGER
Danger! High voltage! The earthing process is not completed until the circuit-breaker is closed.
➭ Close the circuit-breaker after having switched the three-position disconnector to READY-
TO-EARTH position.

➭ Close the circuit-breaker (see page 148, "Circuit-breaker operation").

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37.5 Deactivating the ready-to-earth function manually

➭ Open the circuit-breaker (see page 148, "Opening the circuit-breaker manually").

Fig. 181: Deactivating the READY-TO-EARTH function of the three-position disconnector

➭ Preselect busbar system for switching operation.

Selector gate to the left: Busbar system 1. Selector gate to the right: Busbar system 2.
➭ Push the left-hand control gate to the right.
✔ The opening for the READY-TO-EARTH function is free.

➭ Switch the three-position disconnector to OPEN position (insert the operating lever for
the READY-TO-EARTH function and turn 180° counter-clockwise).
✔ The earthing switch is open.

✔ The position indicator changes to OPEN position.

➭ Remove the operating lever for the READY-TO-EARTH function.

✔ The left-hand control gate returns to its initial position.

✔ The opening for the READY-TO-EARTH function is closed.

37.6 Three-position disconnector with auxiliary voltage

(motor operating mechanism)
Three-position disconnectors with motor operating mechanism can also be controlled from
remote according to their design.

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Operation

37.7 Emergency release of the interlock with solenoids at

the three-position disconnector
If the switchgear is equipped with a solenoid interlocking, the control gate is blocked
if there is no auxiliary voltage available. In case of emergency, this interlock can be bypassed
as follows:

DANGER
If the interlocking provided by the control gate is eliminated, switching operations are possible
that can cause an arc fault which will endanger the life of the people present and damage the
switchgear.
➭ Do only eliminate the interlocking of the control gate to push the control gate to the center
position.
➭ Do not perform switching operations.
➭ Use a screwdriver that fits the hole diameter of the solenoid openings.

To push the control gate from center position to right position:

➭ Remove the left-hand plastic split rivet.
➭ Insert the screwdriver through the left-hand opening and push the solenoid back.
➭ Push the control gate to the right.
✔ The left-hand solenoid is released again, blocking further movements.

Fig. 182: Pushing the control gate to the right position

To push the control gate from center position to left position:

➭ Remove the right-hand dummy plug.
➭ Insert the screwdriver through the right-hand opening and push the solenoid back.
➭ Push the control gate to the left.
✔ The right-hand solenoid is released again, blocking further movements.

Fig. 183: Pushing the control gate to the left position

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To push the control gate from the right or left position to the center position again:
➭ Remove the plug (according to the position of the control gate) and push the solenoid back
with the screwdriver.
➭ Push the control gate to the center position.
➭ After work completion, pull the screwdriver out and refit the stopper.
✔ The solenoid is released again, blocking further movements.

Fig. 184: Pushing the control gate to the center position

37.8 Emergency operation of the three-position disconnector

If the motor voltage of the three-position disconnector with motor operating mechanism fails
and the three-position disconnector is in no defined end position, the three-position
disconnector must be operated manually.

Adapter for ➭ Push emergency operation adapter on operating lever for three-position disconnector.
emergency operation

ATTENTION
If the operating lever with pushed-on adapter is incorrectly used, the indicator or even the
operating mechanism of the three-position disconnector can be damaged.
➭ The operating lever with pushed-on adapter is not aligned according to the noses of the
standard operating lever, but according to the adapter slots.

Fig. 185: Marking (long slot) on operating lever with pushed-on adapter

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Operation

Fig. 186: Marking (short slot) on operating lever with pushed-on adapter

The noses of the operating lever are not significant for evaluating the position of the
operating mechanism.

End positions of the three-position switch while switching with the operating lever
with pushed-on adapter

ATTENTION
The operating lever does not have a stop. Switching beyond the end position of
the three-position switch with the operating lever with pushed-on adapter will damage
the three-position switch.
➭ Do always observe the markings on the adapter of the operating lever.

Insert the operating lever with pushed-on adapter in such a way that the inner slot of
the adapter fits on the pin of the operating shaft.

Fig. 187: Inserting the operating lever with pushed-on adapter

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End positions of DISCONNECTOR

Adapter position Position of long slot: Adapter position Position of long slot:
left right
Position of short slot: Position of short slot:
right left

The disconnector is in CLOSED position. The disconnector is in OPEN position.

End positions of EARTHING SWITCH

Adapter position Position of long slot: bottom Adapter position Position of long slot: top
Position of short slot: top Position of short slot: bottom

The earthing switch is in CLOSED position. The earthing switch is in OPEN position.

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Operation

Emergency operation of If the switch does not reach its end position, e.g., due to a failure of the auxiliary voltage
the DISCONNECTING during disconnector operation, push the operating lever with pushed-on adapter onto
function the hexagonal shaft for the DISCONNECTING function in such a way that the pin of the
hexagonal shaft fits in the inner slot of the operating adapter.

Fig. 188: Inserting the operating lever with pushed-on adapter (DISCONNECTING function)

DANGER
Danger of personal damage due to short-circuit. When switching with the emergency
operating lever with adapter, there is a risk of switching a live busbar system straight to
EARTHED position.
➭ Turn the emergency operating lever with adapter carefully into the required end position.
➭ When switching with the emergency operating lever with adapter, check the current
switch position continuously at the position indicator.

ATTENTION
The work-in-progress earthing contact of the disconnector in busbar system 2 is designed for
maintenance work at the three-position disconnector in busbar system 1 in de-energized
condition only.
➭ Before switching to the work-in-progress earthing contact, always contact the regional
Siemens representative.

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Fig. 189: Emergency operation of the DISCONNECTING function of the three-position disconnector

➭ Push the control gate to the left.

➭ Push the control gate to the left.
✔ The opening for the DISCONNECTING function is free.

To switch the DISCONNECTING function of three-position disconnector to the desired end

position (CLOSED or OPEN), perform the following actions:
➭ Turn the emergency operating lever until the position indicator changes to CLOSED or OPEN
position.

Position of emergency Marking of slot Position of three-position

operating lever disconnector
horizontal at the bottom CLOSED
at the top OPEN

➭ Remove the emergency operating lever again.

✔ The control gate returns to its initial position.

✔ The opening for the DISCONNECTING function is closed.

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Operation

Emergency operation of If the switch does not reach its end position, e.g., due to a failure of the auxiliary voltage
the READY-TO-EARTH during earthing switch operation, push the operating lever with pushed-on adapter onto the
function hexagonal shaft for the READY-TO-EARTH function in such a way that the pin of the hexagonal
shaft fits in the inner slot of the operating adapter.

Fig. 190: Inserting the operating lever with pushed-on adapter (READY-TO-EARTH function)

ATTENTION
The emergency operating lever with adapter does not have a stop. Switching with the
emergency operating lever beyond the end position of the DISCONNECTING function of the
three-position disconnector will damage the three-position disconnector.
➭ Do not turn the emergency operating lever with adapter beyond the horizontal position.

Fig. 191: Emergency operation of the READY-TO-EARTH function of the three-position disconnector

➭ Push the control gate to the left.

➭ Push the control gate to the right.
✔ The opening for the READY-TO-EARTH function is free.

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➭ Push the emergency operating lever onto the hexagonal shaft for the READY-TO-EARTH
function so that the pin of the hexagonal shaft fits in the slot of the emergency operating
lever.
To switch the the READY-TO-EARTH function of the three-position disconnector to the desired
end position (READY-TO-EARTH or OPEN), perform the following actions:
➭ Turn the emergency operating lever until the position indicator changes to
READY-TO-EARTH or OPEN position.

Position of emergency Marking of slot Position of three-position

operating lever disconnector
vertical left READY-TO-EARTH
right OPEN

➭ Remove the emergency operating lever again.

✔ The control gate returns to its initial position.

✔ The opening for the READY-TO-EARTH function is closed.

Switching operations ➭ Perform further manual switching operations only with the associated operating levers for
after emergency the DISCONNECTING or READY-TO-EARTH functions.
operation

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Operation

38 Feeder earthing and de-earthing

DANGER
High voltage! Danger! Do always observe the Five Safety Rules
➭ Isolate the switchgear.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.

DANGER
Danger! High voltage! The earthing process is not completed until the circuit-breaker is closed.
➭ Close the circuit-breaker after having switched the three-position disconnector to READY-
TO-EARTH position.

ATTENTION
Earthing under load will destroy the three-position disconnector.
➭ For circuit-breaker panels: Circuit-breaker panels cannot be operated when the
disconnecting function is mechanically interlocked (see page 148, "Opening the circuit-
breaker manually").
➭ For disconnector panels: Make sure that the feeder is isolated from supply.

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38.1 Feeder earthing

ATTENTION
If the "feeder earthed" locking device is activated and padlocked, the circuit-breaker cannot be
opened, neither electrically nor mechanically. Operating the circuit-breaker locking device with
the disconnector in OPEN or CLOSED position can damage the switchgear.
➭ Operate the circuit-breaker locking device only in the EARTHED position, and secure it with
a padlock.

➭ Switch the three-position disconnector to READY-TO-EARTH position

(see page 155, "Activating the ready-to-earth function manually").

➭ Close the circuit-breaker (see page 148, "Closing the circuit-breaker manually").

➭ Pull the moving part of the "feeder earthed" locking device upwards.
➭ Padlock the locking device.

38.2 Feeder de-earthing

➭ Remove the padlock at the “feeder earthed” locking device.
✔ The moving part of the locking device folds downwards.

NOTE
In circuit-breaker operating mechanisms with undervoltage release, the circuit-breaker trips
automatically after removing the padlock if
➭ the panel is earthed and
➭ auxiliary voltage is available.

➭ Open the circuit-breaker (see page 148, "Opening the circuit-breaker manually").
➭ Switch the three-position disconnector to OPEN position
(see page 157, "Deactivating the ready-to-earth function manually").

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Operation

39 Operating the busbar make-proof earthing switch

39.1 Control elements and indicators

① Additional compartment for

operating mechanism of
busbar earthing switch
② Position indicator
③ Actuating opening
④ Operating spindle
at the operating lever

Fig. 192: Manual operating mechanism for

busbar earthing switch (basic scheme)

Fig. 193: Operating lever for busbar earthing switch

(basic scheme)

The busbar earthing switch is equipped with a manual high-speed closing facility for
make-proof earthing of the busbar.
The cover of the actuating opening is interlocked electromechanically.
Optionally, the control gate can be padlocked in one of the two switch positions.

DANGER
High voltage! Danger! By no means may the busbar make-proof earthing switch be operated
under load, as it will be destroyed in case of repetition.
➭ Observe the Five Safety Rules.
➭ Disconnect the incoming and outgoing feeders in all panels.

NOTE
Once started, a switching operation is totally completed by the motor operating mechanism
control to prevent intermediate positions. Starting another switching operation or switching
back in the course a switching operation is not possible.
➭ Wait for completion of a started switching operation before starting another switching
operation.

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39.2 Closing

ATTENTION
The control gate can only be moved to a position that is permissible at this moment.
➭ Observe the position indicator at the busbar earthing switch.

ATTENTION
Once you have started a switching operation, you must complete it totally; turning back is
blocked. The operating lever cannot be removed at intermediate positions.
➭ Do not remove the operating lever at intermediate positions.

Fig. 194: Closing the busbar earthing switch (basic scheme)

➭ Push the control gate to the right.

The position indicator changes to faulty position.
➭ Hold the operating lever in horizontal position.
➭ Insert the operating lever in the actuating opening as far as it will go. Observe the position
of the operating spindle.
➭ Turn the operating lever 180° clockwise.
➭ Remove the operating lever.
✔ The control gate is in its initial position again.
The position indicator changes from faulty position to CLOSED position.

➭ Optionally: Padlock the control gate.

✔ The busbar earthing switch is closed.

Fig. 195: Position indicator at the busbar earthing switch (basic scheme)

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Operation

39.3 Opening

ATTENTION
The control gate can only be moved to a position that is permissible at this moment.
➭ Observe the position indicator at the busbar earthing switch.

ATTENTION
Once you have started a switching operation, you must complete it totally; turning back is
blocked. The operating lever cannot be removed at intermediate positions.
➭ Do not remove the operating lever at intermediate positions.

Fig. 196: Opening the busbar earthing switch (basic scheme)

➭ Push the control gate to the left.

The position indicator changes to faulty position.
➭ Hold the operating lever in horizontal position.
➭ Insert the operating lever in the actuating opening as far as it will go.
Observe the position of the operating spindle.
➭ Turn the operating lever 180° counter-clockwise.
➭ Remove the operating lever.
✔ The control gate is in its initial position again.
The position indicator changes from faulty position to OPEN position.

➭ Optionally: Padlock the control gate.

✔ The busbar earthing switch is open.

Fig. 197: Position indicator at the busbar earthing switch (basic scheme)

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39.4 Emergency release of the interlock with solenoids

at the busbar earthing switch

DANGER
If the interlocking of the control gate is eliminated, switching operations are possible that can
cause an arc fault which will endanger the life of the people present and damage the
switchgear.
➭ Do only eliminate the interlocking of the control gate to push the control gate to the center
position.
➭ Do not perform switching operations.
➭ Use a screwdriver that fits the hole diameter of the solenoid openings.

To push the control gate from center position to right position:

➭ Remove the left-hand plastic split rivet.
➭ Insert the screwdriver through the left-hand opening and push the solenoid back.
➭ Push the control gate to the right.
✔ The left-hand solenoid is released again, blocking further movements.

Fig. 198: Pushing the control gate to the right position (basic scheme)

To push the control gate from center position to left position:

➭ Remove the right-hand dummy plug.
➭ Insert the screwdriver through the right-hand opening and push the solenoid back.
➭ Push the control gate to the left.
✔ The right-hand solenoid is released again, blocking further movements.

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Operation

Fig. 199: Pushing the control gate to the left position (basic scheme)

To push the control gate from the right or left position to the center position again:
➭ Remove the plug (according to the position of the control gate) and push the solenoid back
with the screwdriver.
➭ Push the control gate to the center position.
➭ After work completion, pull the screwdriver out and refit the stopper.
✔ The solenoid is released again, blocking further movements.

Fig. 200: Pushing the control gate to the center position (basic scheme)

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40 Interlocks
Switching devices may only be controlled and operated in logical dependence on the switch
position of other devices. Unpermissible switching operations must be locked in order to
• provide full protection for the personnel
• prevent switchgear damages and power failures.

The interlocks are mainly of the mechanical type. For dependencies, see the following tables:

Fig. 201: Circuit-breaker panel

Switching operation Switching is operation only possible if Type
Q1 CLOSED / OPEN Q0 OPEN, Q2 OPEN, Q5 OPEN mechanical
Q2 CLOSED/OPEN Q0 OPEN, Q1 OPEN, Q5 OPEN mechanical
Q5 CLOSED/OPEN Q0 OPEN, Q1 and Q2 OPEN mechanical
Q0 CLOSED (mechanically) Q1, Q2, as well as Q5 not in intermediate position mechanically (for manual operation of Q1, Q2)
Q0 CLOSED (electrically) Q1, Q2, or Q5 not in intermediate position electrical
Q0 OPEN it is not interlocked by a locking device when the mechanical
feeder is earthed
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

Fig. 202: Bus coupler (system 1 described, system 2 applies accordingly)

Switching operation Switching operation is only possible if Type
Q1 CLOSED/OPEN Q0 OPEN, Q15 OPEN mechanical
Q25 CLOSED/OPEN Q0 OPEN, Q2 OPEN mechanical
Q0 CLOSED (mechanically) Q1, Q2, Q15, as well as Q25 not in intermediate mechanically (for manual operation of Q1, Q2,
position Q15, or Q25)
Q0 CLOSED (electrically) Q1, Q2, as well as Q5 not in intermediate position electrical
Q0 OPEN (electrically) - being released by a bus coupler lock-in - it is not electrical / mechanical
interlocked by a locking device when the busbar
system is earthed
Q0 OPEN (mechanically) it is not interlocked by a locking device when the mechanical
busbar system is earthed
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

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Operation

Fig. 203: Bus sectionalizer (system 2 described, system 1 applies accordingly)

Switching operation Switching operation is only possible if Type
Q2 CLOSED/OPEN Q02 OPEN, Q25 OPEN mechanical
Q20 CLOSED/OPEN Q02 OPEN, Q205 OPEN electromechanically / mechanically
Q25 CLOSED/OPEN Q02 OPEN, Q2 OPEN mechanical
Q205 CLOSED/OPEN Q02 OPEN, Q20 OPEN electromechanically / mechanically
Q02 CLOSED (mechanically)
Q02 CLOSED (electrically) Q2, Q20, Q25, as well as Q205 not in electrical
intermediate position
Q02 OPEN (electrically) - being released by a bus coupler lock-in - it is not electrically / mechanically
interlocked by a locking device when the busbar
system is earthed
Q02 OPEN (mechanically) it is not interlocked by a locking device when the mechanical
busbar system is earthed
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

Fig. 204: Top-mounted bus sectionalizer (system 2 described, system 1 applies accordingly)
Switching operation Switching operation is only possible if Type
Q21 CLOSED/OPEN Q215 OPEN mechanical
Q22 CLOSED/OPEN Q225 OPEN mechanical
Q215 CLOSED/OPEN Q21 OPEN mechanical
Q225 CLOSED/OPEN Q22 OPEN mechanical
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

Fig. 205: Disconnectable busbar connection

Switching operation Switching operation is only possible if Type
Q61 or Q62 CLOSED/OPEN permitted by internal or external switchgear electromechanical / mechanical
interlocks, Q81 or Q82 OPEN
Q81 or Q82 CLOSED/OPEN permitted by internal or external switchgear electromechanical / mechanical
interlocks, Q61 or Q62 OPEN
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

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Fig. 206: Disconnectable busbar voltage transformer

Switching operation Switching operation is only possible if Type
Q61 or Q62 CLOSED/OPEN Q81 or Q82 OPEN mechanical
Q81 or Q82 CLOSED/OPEN Q61 or Q62 OPEN mechanical
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

Fig. 207: Busbar earthing switch

Switching operation Switching operation is only possible if Type
Q15 or Q25 CLOSED/OPEN opening for operating lever is open optionally mechanical with locking device or
electromechanical
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.

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Operation

41 Verification of safe isolation from supply

41.1 LRM plug-in sockets

DANGER
High voltage! Danger! Verify safe isolation from supply without any doubt!
 Possible sources of failure:
- Defective voltage indicator (or device for function testing of the coupling section)
- Maloperation of the voltage indicator
(or device for function testing of the coupling section)

 Test the perfect function of the voltage indicator and the coupling section in accordance
with national standards:
- On a live panel
- With a test unit according to IEC 61243-5/EN 61243-5
- On all phases

➭ Use only voltage indicators or devices according to EN 61 243-5 / IEC 61 243-5 /

VDE 0682-415 to test the function of the coupling section. (The interface conditions have
not changed as against the old standard VDE 0681 Part 7; the corresponding indicators can
still be used.)
➭ Perform repeat test of interface conditions at the capacitive interfaces, as well as on
the indicators according to the customer’s specifications or national standards.
➭ Do not use short-circuiting jumpers as separate plugs. The function of the surge arrester
installed is not guaranteed anymore if short-circuiting jumpers are used (see page 34,
"Voltage detecting systems").

① Voltage indicator type LRM

② Interface (capacitive test socket) for L2
③ Earth socket
④ Documentation to repeat test
of interface condition
⑤ Cover for test sockets

Fig. 208: Verification of safe

isolation from supply

➭ Remove covers from plug-in sockets (capacitive test sockets L1, L2, L3).
➭ Plug voltage indicator in all three phases L1, L2, L3 of the plug-in sockets.
✔ If the indicator does not flash or light up in any of the three phases, the phases are not live.

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➭ Replace the covers on the plug-in sockets.

Indication LRM system

Indication flashes Phase not isolated from supply

Indication lights up Phase not isolated from supply

Indication does not light Phase isolated from supply

up or flash

41.2 Indications VOIS, VOIS R+, CAPDIS -S1+/-S2+

DANGER
High voltage! Danger! Verify safe isolation from supply without any doubt!
 Possible sources of failure:
- Defective voltage indicator (or device for function testing of the coupling section)
- Maloperation of the voltage indicator
(or device for function testing of the coupling section)

➭ Use only voltage indicators or devices according to EN 61 243-5 / IEC 61 243-5 /

VDE 0682-415 to test the function of the coupling section. (The interface conditions have
not changed as against the old standard VDE 0681 Part 7; the corresponding indicators can
still be used.)

DANGER
High voltage! Danger! Do only modify the factory setting of the C2 module in the voltage
detecting system CAPDIS-S1+/S2+ after consultation with the regional Siemens representative!
➭ If the setting of the C2 module was modified by mistake, re-establish the factory setting
as follows:
- Pull out the C2 module ③ at the rear side of CAPDIS-S1+/S2+.
Caution: Open printed circuit board may be energized.
- Plug the C2 module ③ into CAPDIS-S1+/S2+ so that the marked arrow ① on
the housing points to the marking ② on the C2 module

Fig. 209: Marking of the factory setting at the C2 module

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Operation

① "Test" button
② Cover
③ LC display
④ Duct for signaling cables CAPDIS-M
⑤ Test socket L2
⑥ Earth socket
⑦ Test socket L3
Fig. 210: CAPDIS-S2+: Cover closed ⑧ Test socket L1
⑨ Short instructions

Fig. 211: CAPDIS-S2+: Cover opened

Indications VOIS, VOIS R+,

Indicatio VOIS+, VOIS R+ CAPDIS-S1+ CAPDIS-S2+
CAPDIS -S1+/-S2+ n L1 L2 L3 L1 L2 L3 L1 L2 L3
A0 Operating voltage not present (CAPDIS-S2+)

A1 Operating voltage present

A2 • Operating voltage not present

• Auxiliary power not present (CAPDIS-S2+)

A3 Failure in phase L1, operating voltage at L2 and

L3 (for CAPDIS-Sx+ also earth-fault indication)

A4 Voltage (not operating voltage) present

A5 Indication: "Test" passed (lights up shortly)

A6 Indication: "Test" not passed (lights up shortly)

A7 Overvoltage present (lights up permanently)

A8 Indication: "ERROR" e.g., in case of missing

auxiliary voltage

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41.3 Indications WEGA 1.2, WEGA 2.2

DANGER
High voltage! Danger! Verify safe isolation from supply without any doubt!
 Possible sources of failure:
- Defective voltage indicator (or device for function testing of the coupling section)
- Maloperation of the voltage indicator (or device for function testing of the coupling
section)

➭ Use only voltage indicators or devices according to EN 61 243-5 / IEC 61 243-5 / VDE 0682-
415 to test the function of the coupling section. (The interface conditions have not
changed as against the old standard VDE 0681 Part 7; the corresponding indicators can still
be used.)

Fig. 212: Operating elements WEGA 1.2/2.2

① LC display (illuminated for WEGA 2.2) ④ Test socket L3

② Test socket L1 ⑤ Earth socket
③ Test socket L2 ⑥ "Display Test" button

Indications WEGA 1.2,

WEGA 2.2 Indication WEGA 1.2 WEGA 2.2
L1 L2 L3 L1 L2 L3
A0 For WEGA 2.2: Operating voltage not present,
auxiliary power present, LCD illuminated

A1 • Operating voltage present

• For WEGA 2.2:
Auxiliary power present, LCD illuminated
A2 • Operating voltage not present
• For WEGA 2.2:
Auxiliary power not present, LCD not illuminated
A3 • Failure in phase L1, operating voltage at L2 and L3
• For WEGA 2.2:
Auxiliary power present, LCD illuminated
A4 • Voltage present, current monitoring of
coupling section below limit value
• For WEGA 2.2: Auxiliary power present, LCD illuminated
A5 • Indication: "Display Test" passed
• For WEGA 2.2: Auxiliary power present, LCD illuminated

A6 For WEGA 2.2:

LCD for missing auxiliary voltage is not illuminated

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Operation

42 Overview of switching operations

42.1 Switching operations in the circuit-breaker panel

Connecting the feeder with busbar system 1

1 2

Initial situation ➭ Push the selector gate to the left.

3 4

➭ Push the left-hand control gate to the left. ➭ Switch the three-position disconnector to CLOSED position
(insert the operating lever for the DISCONNECTING function and turn
180° clockwise).

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5 6

➭ Remove the operating lever for the DISCONNECTING function. ➭ Push the selector gate to the center position.
The left-hand control gate returns to its initial position.
7

➭ Close the circuit-breaker.

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Operation

Disconnecting the feeder from busbar system 1

1 2

Initial situation ➭ Open the circuit-breaker.

3 4

➭ Push the selector gate to the left. ➭ Push the left-hand control gate to the left.

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5 6

➭ Switch the three-position disconnector to OPEN position (insert the ➭ Remove the operating lever for the DISCONNECTING function.
operating lever for the DISCONNECTING function and turn 180° The left-hand control gate returns to its initial position.
counter-clockwise).
7

➭ Push the selector gate to the center position.

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Operation

Feeder earthing

1 2

Initial situation ➭ Push the selector gate to the left.

3 4

➭ Push the left-hand control gate to the right. ➭ Switch the three-position disconnector to READY-TO-EARTH position
(insert the operating lever for the READY-TO-EARTH function and turn
180° clockwise).

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5 6

➭ Remove the operating lever for the READY-TO-EARTH function. ➭ Push the selector gate to the center position.
The left-hand control gate returns to its initial position.
7

➭ Close the circuit-breaker.

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Feeder de-earthing

1 2

Initial situation ➭ Open the circuit-breaker.

3 4

➭ Push the selector gate to the left. ➭ Push the left-hand control gate to the right.

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5 6

➭ Switch the three-position disconnector to OPEN position (insert the ➭ Remove the operating lever for the READY-TO-EARTH function.
operating lever for the READY-TO-EARTH function and turn 180° The left-hand control gate returns to its initial position.
counter-clockwise).
7

➭ Push the selector gate to the center position.

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42.2 Switching operations in the bus sectionalizer panel

Coupling the busbar sections of system 1

Initial situation
2

➭ Push the left-hand selector gate to the right.

3

➭ Push the right-hand selector gate in the left-hand panel to the left.

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➭ Switch the three-position disconnector to CLOSED position (insert the operating lever for the DISCONNECTING function and
turn 180° clockwise).
5

➭ Remove the operating lever for the DISCONNECTING function.

The right-hand control gate in the left-hand panel returns to its initial position.
6

➭ Push the left-hand selector gate to the center position.

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Operation

➭ Push the right-hand selector gate to the left.

8

➭ Push the left-hand control gate in the right-hand panel to the left.
9

➭ Switch the three-position disconnector to CLOSED position (insert the operating lever for the DISCONNECTING function and
turn 180° clockwise).

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 Operation

10

➭ Remove the operating lever for the DISCONNECTING function.

The left-hand control gate in the right-hand panel returns to its initial position.
11

➭ Push the right-hand selector gate to the center position.

12

➭ Close the circuit-breaker in the right-hand panel.

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Operation

42.3 Switching operations in the bus coupler panel

Coupling systems 1 and 2

1 2

Initial situation ➭ Push the selector gate to the right.

3 4

➭ Push the right-hand control gate to the left. ➭ Switch the three-position disconnector to CLOSED position (insert the
operating lever for the DISCONNECTING function and turn 180°
clockwise).
5 6

➭ Remove the operating lever for the DISCONNECTING function. ➭ Push the selector gate to the left.
The right-hand control gate returns to its initial position.

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 Operation

7 8

➭ Push the left-hand control gate to the left. ➭ Switch the three-position disconnector to CLOSED position (insert the
operating lever for the DISCONNECTING function and turn 180°
clockwise).
9 10

➭ Remove the operating lever for the DISCONNECTING function. ➭ Push the selector gate to the center position.
The left-hand control gate returns to its initial position.
11

➭ Close the circuit-breaker.

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Operation

42.4 Switching operations in top-mounted bus sectionalizer, system 1

Coupling busbar sections (system 1)

1 2

Initial situation ➭ Push the left-hand control gate to the left.

3 4

➭ Switch the three-position disconnector to CLOSED position (insert ➭ Remove the operating lever for the DISCONNECTING function.
the operating lever for the DISCONNECTING function and turn 180° The left-hand control gate returns to its initial position.
clockwise).
5 6

➭ Push the right-hand control gate to the left. ➭ Switch the three-position disconnector to CLOSED position (insert the
operating lever for the DISCONNECTING function and turn 180°
clockwise).
7

➭ Remove the operating lever for the DISCONNECTING function.

The right-hand control gate returns to its initial position.

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 Operation

Decoupling the busbar section (system 1)

1 2

Initial situation ➭ Push the left-hand control gate to the left.

3 4

➭ Switch the three-position disconnector to OPEN position (insert the ➭ Remove the operating lever for the DISCONNECTING function.
operating lever for the DISCONNECTING function and turn 180° The left-hand control gate returns to its initial position.
counter-clockwise).
5 6

➭ Push the right-hand control gate to the left. ➭ Switch the three-position disconnector to OPEN position (insert the
operating lever for the DISCONNECTING function and turn
180° counter-clockwise).
7

➭ Remove the operating lever for the DISCONNECTING function.

The right-hand control gate returns to its initial position.

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Operation

Earthing the busbar section (system 1)

1 2

Initial situation ➭ Push the left-hand control gate to the left.

3 4

➭ Switch the three-position disconnector to CLOSED position (insert the ➭ Remove the operating lever for the DISCONNECTING function.
operating lever for the DISCONNECTING function and turn 180° The left-hand control gate returns to its initial position.
clockwise).
5 6

➭ Push the right-hand control gate to the right. ➭ Switch the three-position disconnector to READY-TO-EARTH position
(insert the operating lever for the READY-TO-EARTH function and turn
180° clockwise).
7

➭ Remove the operating lever for the READY-TO-EARTH function.

The left-hand control gate returns to its initial position.

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 Operation

De-earthing the busbar section (system 1)

1 2

Initial situation ➭ Push the right-hand control gate to the right.

3 4

➭ Switch the three-position disconnector to READY-TO-EARTH position ➭ Remove the operating lever for the READY-TO-EARTH function.
(insert the operating lever for the READY-TO-EARTH function and turn The right-hand control gate returns to its initial position.
180° counter-clockwise).
5 6

➭ Push the left-hand control gate to the left. ➭ Switch the three-position disconnector to OPEN position (insert the
operating lever for the DISCONNECTING function and turn 180°
counter-clockwise).
7

➭ Remove the operating lever for the DISCONNECTING function.

The left-hand control gate returns to its initial position.

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Operation

Earthing the busbar section (system 2)

1 2

Initial situation ➭ Push the right-hand control gate to the left.

3 4

➭ Switch the three-position disconnector to CLOSED position (insert the ➭ Remove the operating lever for the DISCONNECTING function.
operating lever for the DISCONNECTING function and turn 180° The right-hand control gate returns to its initial position.
clockwise).
5 6

➭ Push the left-hand control gate to the right. ➭ Switch the three-position disconnector to READY-TO-EARTH position
(insert the operating lever for the READY-TO-EARTH function and turn
180° clockwise).
7

➭ Remove the operating lever for the READY-TO-EARTH function.

The left-hand control gate returns to its initial position.

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42.5 Switching operations for disconnectable voltage transformers

Connecting voltage transformers with busbar 1

1 2

Initial situation ➭ Push the control gate to the left.

3 4

➭ Switch the three-position disconnector to ➭ Remove the operating lever for

CLOSED position (insert the operating lever for the DISCONNECTING function.
the DISCONNECTING function and turn The control gate returns to its initial position.
180° clockwise).

Disconnecting voltage transformers from busbar 1

1 2

Initial situation ➭ Push the control gate to the left.

3 4

➭ Switch the three-position disconnector to OPEN ➭ Remove the operating lever for
position (insert the operating lever for the DISCONNECTING function.
the DISCONNECTING function and turn The control gate returns to its initial position.
180° counter-clockwise).

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Operation

Earthing voltage transformers

1 2

Initial situation ➭ Push the control gate to the right.

3 4

➭ Switch the three-position disconnector to ➭ Remove the operating lever for

READY-TO-EARTH position (insert the operating the READY-TO-EARTH function.
lever for the READY-TO-EARTH function and The control gate returns to its initial position.
turn 180° clockwise).

De-earthing voltage transformers

1 2

Initial situation ➭ Push the control gate to the right.

3 4

➭ Switch the three-position disconnector to OPEN ➭ Remove the operating lever for
position (insert the operating lever for the the READY-TO-EARTH function.
READY-TO-EARTH function and turn The control gate returns to its initial position.
180° counter-clockwise).

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43 Cable testing

43.1 Test voltage

Two possibilities for cable testing are described hereafter.
The following table contains the maximum values for the DC test voltage:

Rated voltage of DC test voltage, Test duration AC test voltage 0.1 Hz, Test duration
switchgear [kV] maximum value [kV] [min] maximum value [kV] [min]
12 48 15 21 60
24 72 15 42 60
36 72 15 63 60
40.5 72 15 70 60

ATTENTION
Before starting the cable test, the suitability of the cables and cable T-plugs must be ensured
regarding the selected test voltage.
➭ If another test duration than specified above is to be applied, please contact the regiuonal
Siemens representative.

43.2 Safety instructions

DANGER
High voltage! Danger! Cable testing may produce flashovers which can cause death or serious
bodily injuries.
➭ Cable testing may only be performed by qualified personnel who is familiar with the
danger involved.
➭ The permissible test voltages must not be exceeded.
➭ Keep safety distances.
➭ Install barriers.
➭ Switch on warnings.

ATTENTION
If the voltage transformer is energized, or if it is of the non-disconnectable type, the test
voltage can destroy the voltage transformer and cause personal injuries.
➭ Earth disconnectable voltage transformers before cable testing.
➭ Remove non-disconnectable voltage transformers.

ATTENTION
The voltage indicators CAPDIS-S1+ and CAPDIS-S2+ may be damaged during power-frequency
voltage tests.
➭ Short-circuit voltage indicators with the earthing points of the test sockets.

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Operation

43.3 Function test

Cable testing with
dismantled cable

Fig. 213: Test arrangement with dismantled cable

➭ Earth the feeder (see page 167, "Feeder earthing").
➭ Remove cable to be tested.
➭ Screw test adapter tight onto cable termination of dismantled cable.
➭ Connect test lead.
➭ Perform voltage test.
Cable testing with
connected cable

Fig. 214: Test arrangement with connected cable

➭ Earth the feeder (see page 167, "Feeder earthing").
➭ Short-circuit capacitive test sockets and test sockets on integrated voltage detecting systems
(e. g. CAPDIS).
➭ Open the circuit-breaker (see page 148, "Opening the circuit-breaker manually").
➭ Switch three-position disconnector to OPEN position
(see page 155, "Opening the three-position disconnector manually ").
➭ Screw test adapter onto cable termination.
➭ Connect test lead.
➭ Perform voltage test.
➭ After voltage test, earth the feeder (see page 167, "Feeder earthing").

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 Servicing

Servicing
44 Maintenance

44.1 Switchgear maintenance

Under normal operating conditions the fixed-mounted circuit-breaker switchgear 8DB10 and
the 3AH49 circuit-breaker are maintenance-free. We recommend to inspect the switchgear
according to the following maintenance recommendation. To prevent any danger during
maintenance, please observe the following safety instructions.
Inspection/testing of the secondary equipment such as the capacitive voltage detecting
system is done within the scope of national standards and customer-specific regulations.

44.2 Safety instructions

DANGER
High voltage! Danger! Do always observe the Five Safety Rules:
➭ Isolate the switchgear.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.

DANGER
High voltage! Danger! Touching live parts will cause death or serious injuries.
➭ Switchgear maintenance may only be performed by qualified personnel who is familiar
with the danger involved.

44.3 Maintenance recommendation

The switchgear should be inspected at the following intervals:

Visual check every 5 years

Status inspection every 10 years
Maintenance after 10000 operating cycles of the circuit-breaker,
see page 205, "Maintenance of the vacuum circuit-breaker operating mechanism"
These intervals are guidelines which have to be adjusted to the different operating conditions
(e.g. dusty environment, frequent condensation, etc.). The maintenance actions with the associated test and
maintenance operations are shown in the following table.

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Servicing

DANGER
Danger of suffocation! SF6 gas is heavier than air and concentrates first near to the floor and in
floor openings.
➭ Do not let SF6 gas get into the environment.
➭ While working with SF6 gas, provide for sufficient ventilation.
➭ After working with SF6 gas, vent the cable basement and any hollows in the floors with
special care.
➭ Observe the safety data sheet for SF6 gas.
➭ Cover or barrier adjacent live parts.
➭ To be done generally before working with SF6 gas: Check and document reusability (dew-
point, gas quality) of the SF6.

Maintenance
recommendation
Visual Status Maintena
check inspection nce
X X X Check and document SF6 gas pressure (see page 44, "Insulating gas SF6")
X X Check and document dew-point (humidity content) ( ≤ –15° C)
X X Check and document gas quality (air content) (SF6 share ≥ 95 %)
X Check operating mechanism and interlocking of disconnector and earthing switch
(if required, grease linkage and bearings)
X Vacuum circuit-breaker operating mechanism
X In all gas compartments, if gas has to be exchanged or upon reaching the number of operating cycles:
➭ Evacuate SF6 gas.
➭ Replace desiccant bags.
➭ Replace toroidal sealing rings.
➭ Fill in SF6 gas.

➭ Check and document gas pressure.

➭ Check tightness.

44.4 Procedure for bolted joints and seals

Please observe the following procedure for maintenance of switchgear parts with bolted
joints:
➭ Recommendation: Always replace the spring elements on loosened bolted joints.

Please observe the following procedure for maintenance of switchgear parts with seals:
➭ Always replace removed toroidal sealing rings by new ones. Toroidal sealing rings can be
obtained from your regional Siemens representative.
➭ Clean the sealing surfaces and grooves in the flanges with a lint-free cloth.
➭ Check the sealing surfaces before installation.
➭ Grease the toroidal sealing rings and place them in the grooves of the flanges.
➭ If required, place desiccant bags in the cover.
➭ Mount the cover.
➭ Bolt the flanges tight cross-wise with the hexagonal bolts M8 with new spring elements.
Tightening torque: 20 Nm.

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 Servicing

44.5 Maintenance of the vacuum circuit-breaker operating mechanism

Under normal operating conditions the fixed-mounted circuit-breaker switchgear 8DB10 and
the 3AH49 circuit-breaker are maintenance-free.
After 10,000 operating cycles or depending on the respective operating conditions (e. g.
dusty environment, frequent condensation, etc.) we recommend to clean the external parts
and, if necessary, to renew the anti-corrosion protection greasing. To do this, you may only
use the materials specified hereafter on the individual functional parts of the circuit-breaker.

Fig. 215: Greasing plan for 3AH49 operating mechanism

Isoflex Topas L 32 Shell Tellus Oil 32
② Curve contour ① Bearing for deflection lever
③ Closing latch ⑤ Auxiliary switch
④ Deflection of auxiliary switch ⑧ Bearing of operating shaft
⑥ Guide of opening spring ⑫ Opening spring
⑦ Deflecton of auxiliary switch
⑨ Opening latch
⑩ Curve for opening latch
⑪ End stop
⑬ Crank pin for pushbutton operation

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Servicing

Permissible lubricants:

For bearings, sliding surfaces:

Isoflex Topas L 32
Klüber - Lubrication KG
Geisenhauer Str. 7
Postfach 70 10 47
D-81310 München

For bearings that are inaccessible for

grease, and bearings of the auxiliary
switch S1:
Tellus Oil 32
Shell Direct GmbH
Suhrenkamp 71
D-22335 Hamburg

ATTENTION
Parts of the switchgear that cannot be dismantled may be damaged if they come into contact
with cleaning agents.
➭ Do not wash joints and bearings which cannot be dismantled with a cleaning agent.

➭ Renew the anti-corrosion protection greasing.

➭ Operate the circuit-breaker several times mechanically by hand for test.

44.6 Cleaning agents and cleaning aids

DANGER
For protection of personnel and environment:
➭ Read the instructions for use of cleaning agents carefully.
➭ Observe the warnings (e.g. inflammable!, corrosive!, etc.)

Cleaning agents HAKU 1025-920 Contains carbon hydrogen!

Household cleaner For cleaning electrostatically stressed insulation (e.g. epoxy
resin)
Cleaning aids Lint-free cleaning paper For applying and cleaning liquid cleaning agent (single use)
Brush
Cleaning rag
Vacuum cleaner

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 Servicing

44.7 Lubricants

Designation Manufacturer Application Comment

Polylub GLY 801 Siemens Current-carrying fixed-mounted No greasing effect; used as
connections (current conductors and mounting aid for toroidal sealing
earthing bars, connections), rings; mounting paste for flanges
flanges with toroidal sealing rings
Barrierta GTE 403 Klüber Contact blades and contacts of Observe the designation "GTE 403"
the three-position disconnector in order to avoid mistakes with
other Barrierta products
Longtherm 2+ Molykote Bearings of the operating linkage Not suitable for greasing points
on the circuit-breaker operating
mechanism

44.8 Switchgear extension and replacement of panels and components

For switchgear extension and replacement of components, please contact the regional
Siemens representative.
Information required for spare part orders of single components and devices:
• Type and serial number of the switchgear and the circuit-breaker (see rating plates)
• Precise designation of the device or component, if applicable on the basis of the information
and illustrations in the associated instructions, a drawing, sketch or circuit diagram

44.9 Spare parts

Due to the fact that all parts of this switchgear type have been optimized to last the normal
service life, it is not possible to recommend particular spare parts.

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Servicing

45 End of service life

Service life Under normal operating conditions, the expected service life of gas-insulated switchgear 8DB10
is at least 35 years, probably 40 to 50 years, taking the tightness of the enclosed high-voltage
parts into account. The service life is limited by the maximum number of operating cycles of
the switching devices installed:
• For circuit-breakers, according to the (endurance) class defined in IEC 62271-100
• For three-position disconnectors and earthing switches, according to the (endurance) class
defined in IEC 62271-102.

The maximum permissible number of operating cycles of the built-in circuit-breakers

is 20,000. The current number of operating cycles can be checked on the mechanical
operations counter.

SF6 gas
NOTE
The equipment contains the fluorized greenhouse gas SF6 registrated by the Kyoto Protocol
with a global warming potential (GWP) of 22 800. SF6 has to be reclaimed and must not be
released into the atmosphere.
➭ For use and handling of SF6, IEC 62271-4:
High-voltage switchgear and controlgear - Part 4:
Use and handling of sulphur hexafluoride (SF6) has to be observed.

1) Source: „Regulation (EU) No. 517/2014 of the European Parlament and of the council of 16 April 2014 on
fluorinated greenhouse gases and repealing Regulation (EC) No 842/2006“

Recycling The switchgear is an environmentally compatible product.

The components of the switchgear can be recycled in an environmentally compatible way by
dismantling into sorted scrap and residual mixed scrap.
After evacuating the SF6 gas, the switchgear mainly consists of the following materials:
• Steel
• Copper
• Aluminum
• Cast resin
• Fiber-reinforced plastics
• Rubber materials
• Ceramic materials
• Lubricants

The switchgear can be recycled in ecological manner in compliance with existing legislation.
Auxiliary devices such as short-circuit indicators have to be recycled as electronic scrap.
Any existing batteries have to be recycled professionally.
As delivered by Siemens, the switchgear does not contain hazardous materials as per the
Hazardous Material Regulations applicable in the Federal Republic of Germany. For operation
in other countries, the locally applicable laws and regulations must be observed.
For further information, please contact the regional Siemens representative.

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 Siemens Service Hotline

Siemens Service Hotline

• Customer Support Global
- +49 180 524 7000
- support.energy@siemens.com
- 24 hours

• Customer Support Brazil (only for Brazilian market)

- +55 11 4585 8040
- suporte.br@siemens.com
- local working hours

• Customer Support India (only for Indian market)

- +91 1 800 419 7477
- service.energy.in@siemens.com
- local working hours

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46 Index
A Circuit-breaker, manual closing ..................................... 148
Accessories ..................................................................... 39 Circuit-breaker, manual opening ................................... 148
Accessories, others ......................................................... 40 Circuit-breaker, sealing the pushbuttons ....................... 150
Accessories, standard...................................................... 39 Circuit-breaker, test operation with auxiliary voltage ..... 151
Aseismic design .............................................................. 38 Circuit-breaker,
Auxiliary means, installation ........................................... 61 test operation without auxiliary voltage ........................ 150
Cleaning agents and cleaning aids................................. 206
B
Bus coupler panel, switching operations........................ 192 Closing solenoid, vacuum circuit-breaker 3AH ................43
Bus sectionalizer panel, switching operations ................ 188 Closing spring, manual charging ................................... 151
Busbar assembly, preparing ............................................ 71 Comments on EMC .........................................................62
Busbar component, busbar connection S2..................... 124 Commissioning ............................................................. 143
Busbar component, busbar connection S3..................... 124 Constructional data, foundation ...................................... 53
Busbar component, busbar earthing switch ................... 126 Constructional stipulations..............................................50
Busbar component, capacitive voltage tap..................... 127 Control elements .......................................................... 146
Busbar component, gas-insulated bar............................ 120 Control elements, three-position disconnector .............. 152
Busbar component, solid-insulated bar.......................... 116 Current transformers ................................................ 28, 29
Busbar component, V-type bar ...................................... 116 D
Busbar components ...................................................... 113 Damping resistor, voltage transformer .......................... 113
Busbar connection S2, busbar component..................... 124 Description ..................................................................... 10
Busbar connection S3, busbar component..................... 124 Desiccant bags, replacing................................................91
Busbar covers, overview.................................................. 49 Disconnectable voltage transformers,
switching operations..................................................... 199
Busbar earthing switch.................................................. 126
Disconnector, function....................................................24
Busbar earthing switch, busbar component ................... 126
Disposal........................................................................ 208
Busbar earthing switch, emergency release ................... 171
Due application................................................................. 8
Busbar voltage transformer, installation .......................... 96
Busbar, evacuating ......................................................... 86 E
Earthing busbar, installation............................................ 83
Busbar, gas filling ........................................................... 85
Earthing system ..............................................................52
C Emergency operation, three-position disconnector ........ 159
Cable basement .............................................................. 53
Emergency release, busbar earthing switch ................... 171
Cable testing................................................................. 201
Emergency release, circuit-breaker ................................ 149
Capacitive voltage tap, busbar component .................... 127
Emergency release, interlock................................. 158, 171
CAPDIS ......................................................................... 177
Emergency release, solenoids ............................... 158, 171
Circuit breaker, mechanical interlock............................... 22
Emergency release, three-position disconnector ............ 158
Circuit-breaker operation .............................................. 148
End of sevice life ........................................................... 208
Circuit-breaker panel, function ........................................ 20
End wall, installation..................................................... 138
Circuit-breaker panel, low-voltage compartment ............. 20
Evacuating...................................................................... 92
Circuit-breaker panel, subframe ...................................... 20
Evacuating with maintenance unit ..................................92
Circuit-breaker panel, switchgear panel........................... 21
Circuit-breaker panel, switching operations ................... 180 F
Features .........................................................................10
Circuit-breaker panel, switchpanel pole ........................... 20
Feeder de-earthing ....................................................... 167
Circuit-breaker, activating undervoltage release ............ 144
Feeder earthing ............................................................ 166
Circuit-breaker, charging the closing spring manually .... 151
Fixing material................................................................62
Circuit-breaker, design .................................................... 22
Floor fixing plate............................................................. 56
Circuit-breaker, emergency release ............................... 149

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Floor openings ............................................................... 50 L
Floor, construction ......................................................... 52 Leakage test ................................................................. 128

Floor, load-bearing capacity ............................................ 51 Lubricants .................................................................... 207

G M
Gas compartment, evacuating ........................................ 92 Maintenance recommendation ..................................... 203
Gas compartment, filling ................................................ 92 Maintenance unit ........................................................... 92
Gas compartments ......................................................... 30 Maintenance, bolted joints and seals............................. 204

Gas filling of busbar........................................................ 85 Maintenance, safety instructions................................... 203

Gas filling, checking...................................................... 128 Maintenance,

vacuum circuit-breaker operating mechanism ............... 205
Gas leakage rate ............................................................. 47
Make-proof busbar earthing switch, description .............. 27
Gas pressure, checking .......................................... 64, 128
Make-proof earthing switch .......................................... 168
Gas pressure, monitoring.............................................. 128
Make-proof earthing switch, closing ............................. 169
Gas quality, checking .................................................... 128
Make-proof earthing switch, control elements and
Gas work after power-frequency voltage test .................. 95 indicators ..................................................................... 168
Gas-insulated bar, busbar component ........................... 120 Make-proof earthing switch, opening............................ 170
H Manual closing, three-position disconnector ................. 154
High-voltage connections, checking.............................. 130 Manual opening, three-position disconnector ............... 155
I Motor operating mechanism, vacuum circuit-breaker ...... 43
Indicators ..................................................................... 146
Mounting the cable bracket ............................................ 80
Information to Siemens before delivery........................... 59
N
Installation material........................................................ 62 Non-disconnectable busbar voltage transformers,
Installation with gas work ............................................... 84 removal........................................................................ 107
Installation work, checks............................................... 143 O
Installation, voltage transformer 4MT3 ........................... 97 Operating mechanism box, design .................................. 23
Installation, auxiliary means............................................ 61 Operating mechanism box, function ............................... 23
Installation, busbar voltage transformer .......................... 96 Operating times.............................................................. 42
Installation, cable bracket ............................................... 80 Operation ..................................................................... 146
Installation, cables with plugs ....................................... 131 Overview, busbar covers ................................................. 49
Installation, earthing busbar ........................................... 83 P
Installation, end wall .................................................... 138 Packing .......................................................................... 63
Installation, final work .................................................. 131 Panel connection ............................................................ 32
Installation, low-voltage cables ..................................... 131 Panel design ................................................................... 20
Installation, panel connections ....................................... 87 Panel earthing ................................................................ 83
Installation, preparing..................................................... 59 Panel types ..................................................................... 11
Installation, solid-insulated bars ...................................... 95 Panel versions................................................................. 12
Installation, tests .......................................................... 128 Partition class ................................................................. 46
Installation, tools ............................................................ 61 Personal protection........................................................... 7
Installation, voltage transformer 4MU4 ......................... 101 Personal protective equipment (PPE)................................. 7
Installation, voltage transformer 4MT7 ......................... 104 Phase sequence .............................................................. 47
Insulating gas SF6........................................................... 44 Power-frequency voltage test.......................................... 84
Integrated varistor .......................................................... 44 Power-frequency voltage test on site............................... 93
Interlocks ..................................................................... 173 PPE................................................................................... 7
IP31D ........................................................................... 133 Protective equipment........................................................ 7

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Q Three-position disconnector,
Qualified personnel........................................................... 8 with motor operating mechanism ................................. 157
Three-position disconnector,
R activating ready-to-earth function ................................. 155
Rating plates................................................................... 48
Three-position disconnector, control elements .............. 152
Re-assembling the busbars.............................................. 72
Three-position disconnector,
Ready-to-earth function, activating ............................... 155 deactivating ready-to-earth function ............................. 157
Ready-to-earth function, deactivating............................ 157 Three-position disconnector, emergency operation ...... 159
Rear walls of switchgear, installation............................. 135 Three-position disconnector, emergency release ........... 158
Recycling ...................................................................... 208 Three-position disconnector, function ............................. 24
Removal, Three-position disconnector, manual closing ................. 154
non-disconnectable busbar voltage transformers........... 107
Three-position disconnector, manual opening ............... 155
Removal, voltage transformer 4MT7 ............................. 111
Three-position disconnector, operation ......................... 152
Removal, voltage transformer 4MU4 ............................ 109
Tools, installation............................................................ 61
S Top-mounted bus sectionalizer, switching operations.... 194
Safety instructions ............................................................ 6
Transport damages .........................................................63
Seaworthy crate, preparing storage................................. 59
Transport of switchgear on roller pads
Seaworthy long-time packing.................................... 60, 61
(reinforced rollers) .......................................................... 67
Seismic withstand capability ........................................... 10
Transport of switchgear without wooden pallets ............. 67
Service Hotline.............................................................. 209
Transport regulations ..................................................... 47
Service instructions....................................................... 203
Transport unit ................................................................. 63
Servicing ...................................................................... 203
Transport unit, erecting ..................................................63
Short instructions ......................................................... 180
Transport unit, installation ..............................................74
Signal terms and definitions.............................................. 6
Transport unit, unloading................................................63
Solid-insulated bar, busbar component ......................... 116
Typical uses ....................................................................10
Spare parts ................................................................... 207
U
Standards, electromagnetic compatibility, EMC ............... 46 Undervoltage release, vacuum circuit-breaker ................43
Storage room/space, preparing ....................................... 59
V
Substation earth ............................................................. 83 V-type bar, busbar component ...................................... 116
Switch positions.............................................................. 25 Vacuum circuit-breaker 3AH, c.t.-operated release........... 43
Switchgear extension and replacement of panels Vacuum circuit-breaker 3AH, closing solenoid ................. 43
and components........................................................... 207
Vacuum circuit-breaker 3AH, tripping signal ....................43
Switchgear maintenance............................................... 203
Vacuum circuit-breaker, motor operating mechanism...... 43
Switchgear room, preparing for installation..................... 50
Vacuum circuit-breaker, shunt release ............................. 43
Switchgear, assembling .................................................. 71
Vacuum interrupters .......................................................22
T Vacuum pump ................................................................86
Technical data ................................................................ 42
Verification of safe isolation from supply ....................... 176
Test operation .............................................................. 143
Verification of safe isolation from supply,
Test operation with auxiliary voltage, circuit-breaker ..... 151 LRM plug-in sockets ...................................................... 176
Test operation with motor operating mechanism, Versions of degrees of protection .................................. 133
circuit-breaker .............................................................. 151
Vertically falling water drops ......................................... 133
Test operation without auxiliary voltage,
circuit-breaker .............................................................. 150 VOIS ............................................................................. 177

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Voltage detecting systems .............................................. 34 Voltage transformer 4MU4 , removal ............................ 109
Voltage transformer 4MT3 ........................................... 107 Voltage transformer, damping resistor .......................... 113
Voltage transformer 4MT3, installation ........................... 97 Voltage transformer,
with or without three-position disconnector.................. 114
Voltage transformer 4MT3, removal.............................. 107
Voltage transformers ...................................................... 28
Voltage transformer 4MT7 , installation ........................ 104
Voltage transformers, removal ...................................... 107
Voltage transformer 4MT7 , removal............................. 111
Voltage transformer 4MU4 , installation........................ 101 W
WEGA 1.2/2.2 ............................................................... 179

864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06 213/214

 Imprint
Siemens AG
Energy Management
Medium Voltage & Systems
Schaltanlagenwerk Frankfurt
Carl-Benz-Str. 22
D-60386 Frankfurt
© Siemens AG 2016

214/214 Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9