Operating Instructions (Original document)

Gas-insulated switchgear ELK-3

420 kV

1HC0038807 E01 eng AK

Read carefully before use. - Observe all safety instructions. - Keep for future reference.
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 Table of Contents

Table of Contents

1 About this document............................................................................................................................................ 9

1.1 Manufacturer........................................................................................................................................................ 9
1.2 Customer support................................................................................................................................................. 9
1.3 Validity and identification...................................................................................................................................... 9
1.4 Purpose................................................................................................................................................................ 9
1.5 Target groups..................................................................................................................................................... 10
1.6 Content overview................................................................................................................................................ 10
1.7 Presentation conventions................................................................................................................................... 10
1.7.1 Residual risks and safety messages.................................................................................................................. 10
1.7.2 Property damage messages.............................................................................................................................. 11
1.7.3 Orientation guide................................................................................................................................................ 11
1.7.4 Text elements..................................................................................................................................................... 11
1.7.5 Cross references................................................................................................................................................ 12
1.7.6 Illustrations......................................................................................................................................................... 12
1.7.7 Values and units................................................................................................................................................. 12
1.7.8 Trademarks........................................................................................................................................................ 12
1.8 Project specific documents................................................................................................................................. 12
1.9 Safekeeping of documents................................................................................................................................. 13

2 Product description............................................................................................................................................ 15
2.1 Introduction......................................................................................................................................................... 15
2.1.1 Intended use....................................................................................................................................................... 16
2.1.2 Conformity and safety........................................................................................................................................ 16
2.1.3 International standards....................................................................................................................................... 16
2.1.4 Symbols for high voltage switchgear.................................................................................................................. 16
2.1.5 Product characteristics....................................................................................................................................... 17
2.2 Performance characteristics and technical data................................................................................................. 17
2.3 Gas equipment................................................................................................................................................... 17
2.3.1 Gas coupling...................................................................................................................................................... 18
2.3.2 Gas density monitor........................................................................................................................................... 18
2.3.3 Pressure relief device......................................................................................................................................... 20
2.4 Busbar................................................................................................................................................................ 21
2.4.1 Function.............................................................................................................................................................. 21
2.4.2 Design................................................................................................................................................................ 21
2.5 Circuit-breaker.................................................................................................................................................... 22
2.5.1 Function.............................................................................................................................................................. 22
2.5.2 Design................................................................................................................................................................ 24
2.5.3 Technical data.................................................................................................................................................... 24
2.6 Circuit-breaker operating mechanism................................................................................................................ 25
2.6.1 Function.............................................................................................................................................................. 25
2.6.2 Design................................................................................................................................................................ 26
2.6.3 Technical data.................................................................................................................................................... 26
2.7 Disconnector-earthing switch............................................................................................................................. 27
2.7.1 Function.............................................................................................................................................................. 27
2.7.2 Design................................................................................................................................................................ 27
2.7.3 Technical data.................................................................................................................................................... 28

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2.8 Fast-acting earthing switch................................................................................................................................. 29

2.8.1 Function.............................................................................................................................................................. 29
2.8.2 Design................................................................................................................................................................ 30
2.8.3 Technical data.................................................................................................................................................... 30
2.9 Connecting elements.......................................................................................................................................... 31
2.9.1 Function.............................................................................................................................................................. 34
2.9.2 Design................................................................................................................................................................ 34
2.9.3 Technical data.................................................................................................................................................... 35
2.10 Separable connector.......................................................................................................................................... 36
2.10.1 Function.............................................................................................................................................................. 36
2.10.2 Design................................................................................................................................................................ 36
2.10.3 Technical data.................................................................................................................................................... 37
2.11 Separable connector with integrated axial compensator.................................................................................... 38
2.11.1 Function.............................................................................................................................................................. 38
2.11.2 Design................................................................................................................................................................ 38
2.11.3 Technical data.................................................................................................................................................... 39
2.12 Parallel compensator.......................................................................................................................................... 40
2.12.1 Function.............................................................................................................................................................. 40
2.12.2 Design................................................................................................................................................................ 40
2.12.3 Technical data.................................................................................................................................................... 41
2.13 Current transformer............................................................................................................................................ 42
2.13.1 Function.............................................................................................................................................................. 42
2.13.2 Design................................................................................................................................................................ 42
2.13.3 Technical data.................................................................................................................................................... 43
2.14 Voltage transformer............................................................................................................................................ 44
2.14.1 Function.............................................................................................................................................................. 44
2.14.2 Design................................................................................................................................................................ 44
2.14.3 Technical data.................................................................................................................................................... 45
2.15 Surge arrester.................................................................................................................................................... 46
2.15.1 Function.............................................................................................................................................................. 46
2.15.2 Technical data.................................................................................................................................................... 46
2.16 Insulator.............................................................................................................................................................. 47
2.16.1 Function.............................................................................................................................................................. 48
2.16.2 Technical data.................................................................................................................................................... 48
2.17 Adapter............................................................................................................................................................... 49
2.17.1 Function.............................................................................................................................................................. 49
2.17.2 Design................................................................................................................................................................ 49
2.17.3 Technical data.................................................................................................................................................... 49
2.18 Local control cubicle........................................................................................................................................... 50
2.18.1 Function.............................................................................................................................................................. 50
2.18.2 Design................................................................................................................................................................ 50
2.18.3 Technical data.................................................................................................................................................... 50
2.19 End cover........................................................................................................................................................... 51
2.19.1 Function.............................................................................................................................................................. 51
2.19.2 Design................................................................................................................................................................ 51
2.19.3 Technical data.................................................................................................................................................... 51
2.20 Bushing.............................................................................................................................................................. 52
2.20.1 Function.............................................................................................................................................................. 52
2.20.2 Design................................................................................................................................................................ 52
2.20.3 Technical data.................................................................................................................................................... 53
2.21 Cable-termination............................................................................................................................................... 54
2.21.1 Function.............................................................................................................................................................. 54

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 Table of Contents

2.21.2 Design................................................................................................................................................................ 54
2.21.3 Technical data.................................................................................................................................................... 55
2.22 Transformer connection..................................................................................................................................... 56
2.22.1 Function.............................................................................................................................................................. 56
2.22.2 Design................................................................................................................................................................ 56
2.22.3 Technical data.................................................................................................................................................... 56

3 Safety information.............................................................................................................................................. 57
3.1 Product safety.................................................................................................................................................... 57
3.2 Hazardous areas................................................................................................................................................ 57
3.3 Product specific hazards.................................................................................................................................... 57
3.4 SF6 gas hazards................................................................................................................................................ 58
3.5 Requirements for working with SF6 gas............................................................................................................. 59
3.5.1 Requirements on the staff.................................................................................................................................. 59
3.5.2 Requirements on the working environment........................................................................................................ 59
3.5.3 Handling and storage requirements................................................................................................................... 60
3.6 Working with SF6 gas........................................................................................................................................ 60
3.6.1 Reclaiming gas................................................................................................................................................... 60
3.6.2 Filling with gas.................................................................................................................................................... 60
3.7 Product protection.............................................................................................................................................. 61
3.8 Product safety signs........................................................................................................................................... 61
3.8.1 Protective earth sign........................................................................................................................................... 61
3.8.2 Hazardous voltages sign.................................................................................................................................... 62
3.8.3 Arc appearance sign.......................................................................................................................................... 62
3.9 Safety recommendations and standard procedures........................................................................................... 62
3.9.1 Safety first.......................................................................................................................................................... 62
3.9.2 7 steps that save lives........................................................................................................................................ 63
3.9.3 Permit to work system........................................................................................................................................ 64
3.10 Obligations of the plant officer and operating company..................................................................................... 64
3.10.1 Minimization of residual risks............................................................................................................................. 65
3.10.2 Safety precautions.............................................................................................................................................. 65
3.10.3 Safety measures................................................................................................................................................ 65
3.10.4 Personnel instructions........................................................................................................................................ 65
3.10.5 Personal protective equipment........................................................................................................................... 65
3.10.6 Emergency information...................................................................................................................................... 66
3.10.7 First aid............................................................................................................................................................... 66

4 Operating elements............................................................................................................................................ 67
4.1 Fast-acting earthing switch................................................................................................................................. 67
4.2 Disconnector-earthing switch............................................................................................................................. 70

5 Indicating elements............................................................................................................................................ 71
5.1 Viewing port for the switching position............................................................................................................... 71
5.2 Gas density monitor........................................................................................................................................... 72
5.3 Spring indicator.................................................................................................................................................. 73
5.4 Oil gauge glass................................................................................................................................................... 73
5.5 Position indicator for the circuit-breaker............................................................................................................. 74

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Table of Contents

5.6 Position indicator for the disconnector-earthing switch...................................................................................... 75

5.7 Position indicator for fast-acting earthing switch................................................................................................ 77

6 Operation........................................................................................................................................................... 79
6.1 Safety instructions.............................................................................................................................................. 79
6.2 Operation modes................................................................................................................................................ 79
6.2.1 REMOTE operating mode.................................................................................................................................. 79
6.2.2 LOCAL operating mode...................................................................................................................................... 79
6.3 Motor operation of the switching elements......................................................................................................... 80
6.4 Manual operation of the circuit-breaker operating mechanism.......................................................................... 80
6.5 Manual operation of the disconnector-earthing switch....................................................................................... 80
6.5.1 Accessing the operating panel........................................................................................................................... 80
6.5.2 Changing to manual operation mode of the disconnector.................................................................................. 82
6.5.3 Opening the disconnector.................................................................................................................................. 83
6.5.4 Closing the disconnector.................................................................................................................................... 84
6.5.5 Changing to blocking mode................................................................................................................................ 85
6.5.6 Closing the operating panel for maintenance..................................................................................................... 86
6.5.7 Changing to manual operation mode of the earthing switch.............................................................................. 87
6.5.8 Opening the earthing switch............................................................................................................................... 88
6.5.9 Closing the earthing switch................................................................................................................................ 89
6.5.10 Changing to motor operation mode.................................................................................................................... 90
6.5.11 Closing the operating panel................................................................................................................................ 91
6.6 Manual operation of the fast-acting earthing switch........................................................................................... 92
6.6.1 Accessing the operating panel........................................................................................................................... 92
6.6.2 Changing to manual operation mode of the fast-acting earthing switch............................................................ 94
6.6.3 Opening the fast-acting earthing switch............................................................................................................. 95
6.6.4 Closing the fast-acting earthing switch............................................................................................................... 96
6.6.5 Changing to blocking mode................................................................................................................................ 97
6.6.6 Closing the operating panel for maintenance..................................................................................................... 98
6.6.7 Changing to motor operation mode.................................................................................................................... 99
6.6.8 Closing the operating panel.............................................................................................................................. 100

7 Maintenance.................................................................................................................................................... 101
7.1 Safety instructions............................................................................................................................................ 101
7.2 Maintenance plan............................................................................................................................................. 101
7.2.1 Unscheduled maintenance............................................................................................................................... 101
7.2.2 Scheduled maintenance based on time intervals............................................................................................. 102
7.2.3 Scheduled maintenance according to mechanical criteria............................................................................... 111
7.2.4 Scheduled maintenance according to the breaking capability of the circuit-breaker....................................... 112
7.3 Technical data.................................................................................................................................................. 113
7.3.1 Pressure of gas-insulated switchgear.............................................................................................................. 113
7.3.2 Nominal filling pressure - temperature overview.............................................................................................. 114
7.3.3 Conversion of dew point into humidity.............................................................................................................. 115
7.3.4 Moisture, percentage and decomposition products – limit values.................................................................... 116
7.3.5 Nominal value of the gas density sensor.......................................................................................................... 116
7.3.6 Tightening torques............................................................................................................................................ 117

8 Packaging........................................................................................................................................................ 119
8.1 Safety instructions............................................................................................................................................ 119

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8.2 Purpose and selection of the packaging.......................................................................................................... 119

8.3 General requirements....................................................................................................................................... 119
8.4 Hazardous goods............................................................................................................................................. 120
8.5 Corrosion protection up to 12 months.............................................................................................................. 120
8.6 Corrosion protection up to 24 months.............................................................................................................. 120
8.7 Corrosion protection exceeding 24 months...................................................................................................... 120
8.8 Marking the packaging..................................................................................................................................... 121

9 Storage............................................................................................................................................................ 123
9.1 Safety instructions............................................................................................................................................ 123
9.2 Storage classification....................................................................................................................................... 123
9.3 General requirements on types of storage....................................................................................................... 124
9.4 Storage requirements for parts and material.................................................................................................... 124
9.5 Protection recommendations against environmental conditions...................................................................... 126
9.6 Product storage example................................................................................................................................. 126
9.7 Storage............................................................................................................................................................. 126
9.8 Maintenance during storage............................................................................................................................. 127

10 Transport.......................................................................................................................................................... 129
10.1 Safety instructions............................................................................................................................................ 129
10.2 Loading and lifting facilities.............................................................................................................................. 129
10.3 Means of transportation.................................................................................................................................... 130
10.4 Forces and stresses during transportation....................................................................................................... 130
10.5 Transport with packaging................................................................................................................................. 130
10.6 Transport without packaging............................................................................................................................ 131

11 Disposal........................................................................................................................................................... 133
11.1 Safety instructions............................................................................................................................................ 133
11.2 Recycling and disposal..................................................................................................................................... 133
11.2.1 Oil..................................................................................................................................................................... 133
11.2.2 Used oil............................................................................................................................................................ 133
11.2.3 Used SF6 gas................................................................................................................................................... 133
11.2.4 Decomposition products of SF6 gas................................................................................................................ 134
11.2.5 Untreated paper............................................................................................................................................... 134
11.2.6 Soiled paper..................................................................................................................................................... 134
11.2.7 Clean cardboard............................................................................................................................................... 134
11.2.8 Soiled cardboard.............................................................................................................................................. 135
11.2.9 Untreated wood................................................................................................................................................ 135
11.2.10 Treated wood................................................................................................................................................... 135
11.2.11 Plastic............................................................................................................................................................... 135
11.2.12 Polystyrene....................................................................................................................................................... 135
11.3 Disposal depots and authorities....................................................................................................................... 135

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 1. About this document

1. About this document

1.1. Manufacturer
The manufacturer is ABB Switzerland Ltd High Voltage Products and hereafter named ABB.
ABB Switzerland Ltd
High Voltage Products
Brown Boveri Strasse 5
CH-8050 Zurich / Switzerland

1.2. Customer support

Hotline 24 hours service: +41(0)844 845 845
Telphone business hours: +41 58 588 31 86
Telefax: +41 58 588 17 22
E-Mail: gis.service@ch.abb.com
If you need to contact the customer support you will need additional information about the
product at your premises, see project specific documents.

1.3. Validity and identification

The document is valid for the described product at the date of delivery. Title and product type
are shown on the front page:
̶ Title: Operating Instructions
̶ Product: Gas-insulated switchgear ELK-3
̶ Type: 420 kV
̶ Product idenification:1HC0071250M0070
The document identification is shown in the footer:
̶ Document ID: 1HC00xxxxx
̶ Revision index: AA
̶ Language: E01 eng (for example E eng = English, D deu = German)

1.4. Purpose
The operating instructions describe the product and provides safety instructions for persons,
product and environment.
The document is an aid for the readers addressed in the itemized sections. It is not a substitute
for the training on the product!
The document enables the reader:
̶ to plan the work and the deployment of manpower
̶ to perform work safely and properly
The document must be read and understood by the addressed target groups.

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1. About this document

1.5. Target groups

The operation and handling of the product:
̶ must be carried out by personnel that has been trained and qualified by ABB
̶ must be carried out under observance of the valid standards and national directives
The assignment of trained and qualified technicians and the observance of all valid standards
must be implemented by the plant officer and operating company.
This document addresses plant officers, operating companies, and trained and qualified tech
nicians. It is incumbent on the plant officer and operating company, to initiate further measures
for the operation and handling of the product.
The following target groups are defined:
̶ Plant officer, operating company
A person or company who is authorized to bear the direct responsibility for the operation of
the plant. If necessary, some obligations as a consequence of this responsibility can be
assigned to other persons.
̶ Routine Operation/Maintenance technician
A person with suitable technical training, knowledge, and experience who has been
trained by ABB.

1.6. Content overview

The sections in the document are structured according to the life cycle of the product during its
use.
The following stages of the product life cycle are supervised by certified ABB technicians and
are not covered by this document:
̶ installation
̶ commissioning
̶ high voltage testing
̶ repair
̶ overhaul
̶ decommissioning

1.7. Presentation conventions

1.7.1. Residual risks and safety messages

Despite technical and design measures, residual risks remain which are not shown on the
product. These residual risks are pointed out in this document. Safety messages precede the
information they refer to.
A symbol associated with a signal word classifies the residual risk.
Each safety message contains:
̶ a symbol that indicates a potential personal injury hazard
̶ a signal word that designates a degree or level of hazard seriousness
̶ a short designation of the residual risk
̶ a brief description of the residual risk and its possible consequences
̶ instructions to avoid the residual risk and possibly first measures if the risk avoidance failed

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 1. About this document

Safety messages are presented in accordance with ANSI Z 535.6.

Residual risk
DANGER
Possible consequences.

4 Instructions to avoid the residual risk and eventually first measures if the risk avoidance
failed.

This safety message indicates an immediate danger which will result in death or serious bodily
injuries if the relevant precautionary measures are not taken.

Residual risk
WARNING
Possible consequences.

4 Instructions to avoid the residual risk and eventually first measures if the risk avoidance
failed.

This safety message indicates a potentially dangerous situation which could result in death or
serious bodily injuries if the relevant precautionary measures are not taken.

Residual risk
CAUTION
Possible consequences.

4 Instructions to avoid the residual risk and eventually first measures if the risk avoidance
failed.

This safety message indicates a potentially dangerous situation which could result in minor
bodily injuries if the relevant precautionary measures are not taken.

1.7.2. Property damage messages

Property damage messages are presented in accordance with ANSI Z 535.6.

Residual risk
NOTICE
Possible consequences.

4 Instructions to avoid the residual risk and eventually first measures if the risk avoidance
failed.

This property damage message indicates a situation which could potentially lead to the product
or an object in its vicinity being damaged if the relevant precautionary measures are not taken.

1.7.3. Orientation guide

The footer gives text elements on the bottom of each page, which assists you as an orientation
when reading:
̶ Document identification code with revision index and language code
̶ Page number
̶ Product name and type

1.7.4. Text elements

Continuous text: Continuous text, lists and action sequences are considered text elements.

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1. About this document

Lists: Lists are marked with dashes. Items of the list placed on the same level are of equal im
portance.
Action sequences: Action sequences describe the procedures to perform tasks in the correct
order, for example during maintenance work. An action sequence typically contains successive
handling procedures, which can be divided into sub-steps. It can also contain help for orienta
tion or intermediate information.

1.7.5. Cross references

The document contains cross references. The following types of cross references are used:
̶ Section 1 Important information about this document, page XX refers to a main or sub-sec
tion within the document starting on the indicated page.
̶ Figure 1 Schematic diagram of density monitor, page XX refers to an image or figure.
̶ Table 1 Calculation values to calculate the circuit-breaker lifetime, page XX refers to infor
mation represented in tabular form.

1.7.6. Illustrations
Illustrations are commented in captions following the illustration. Illustrations are not to scale.

1.7.7. Values and units

Values above 1000 are displayed without dividers for thousands. A dot “.” is used as the deci
mal separator.
Units are presented according to the International System of Units, SI. Base units, their multi
ples or sub-units are used.

1.7.8. Trademarks
The company and brand names mentioned in this document, as well as the product and type
designations are property of the particular holder and are subject to protection by company,
brand, and patent and competition laws.

1.8. Project specific documents

Project specific information is not covered by this document. Details of the project specific con
figuration of the product installed are covered by project specific documents:
̶ Project specific data
̶ On-Site Assembly Instructions
̶ Overhaul Instructions
̶ SF6 gas handling instructions
̶ Rating plates
̶ Table of SF6 Gas Volumes
̶ Drawings (for example GIS Layout, Civil Work Requirements)
̶ Quality plan
̶ Shop Test Program
̶ Test Reports

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 1. About this document

̶ Local Control Cubicle documents (Operating Instructions, Mimic panels, Schemes/

diagrams, Test reports)

1.9. Safekeeping of documents

The plant officer and operating company is bound to have the necessary documents and docu
mentation readily available in close vicinity of the product.

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1. About this document

14 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 2. Product description

2. Product description

2.1. Introduction

7 4 3

6 5

Fig. 1: Gas-insulated switchgear bay (example)

1 Busbar with disconnector 2 Current transformer

3 Voltage transformer 4 Drive for fast-acting earthing switch
5 Bay support structure 6 Circuit-breaker
7 Circuit-breaker operating mechanism 8 Local control cubicle

Gas-insulated switchgear installations consist of an array of modular configured switchgear

bays, which can distribute high-voltage power to different connected power lines. Gas-insulat
ed switchgear installations serve the following functions:
̶ power distribution and transmission within power grids
̶ power distribution and transmission to different local or functional consumption areas
̶ automated control for the connection or separation of power lines
̶ balancing of power distribution according to power consumption
Typically each switchgear bay consists of the following basic components:
̶ Circuit-breaker with interrupting chamber
̶ Busbar connectors
̶ Disconnectors
̶ Earthing switches
̶ Operating mechanism(s)
̶ SF6 gas equipment
̶ Local control cubicle (not covered by this document)

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2. Product description

2.1.1. Intended use

The product has to be used solely within high voltage applications, such as power transmis
sion and distribution or for the coupling of parts of power grids.
The product has to be operated and maintained within the limits as set out throughout this
document. It is not allowed to modify the product.
All other use without previous written consent by means of a special technical release by ABB
is considered as misuse.

2.1.2. Conformity and safety

The product has been designed and assembled by ABB according to state-of-the-art technolo
gy. The product consists of enclosed units. The enclosures of the units are touch proof regard
ing the live components. Health and safety concerns – as governed by laws, ordinances, and
directives – have been taken into consideration, in particular in the area of:
̶ fire hazards
̶ SF6 gas emissions
̶ noise emissions
̶ electromagnetic compatibility (EMC)

2.1.3. International standards

The applicable international standards for performance, conformity, and safety of the product,
assemblies and components have been applied.
Component Standard
All gas-insulated switchgear components IEC 62271-203 IEC 62271-1, IEC 60367
Circuit-breaker and drive IEC 62271-100, ANSI C 37.09
SF6 gas system IEC 60367, IEC 60480
Disconnector, earthing switch and drive IEC 62271-102
Fast-acting earthing switch and drive IEC 62271-102
Current transformer IEC 61869-1, IEC 61869-2
Voltage transformer IEC 60044-2
SF6 -air bushing IEC 60137
Cable terminals IEC 62271-209
Transformer connection IEC 61639 (future IEC 62271-211)
Surge arrester IEC 60099-4
Gas density monitor IEC 61000-4-4, IEC 61000-4-5
Symbols for high-voltage switchgear IEC 60617-7
Tab. 1: International standards

2.1.4. Symbols for high voltage switchgear

Symbols for high voltage switchgear characterizing the components may differ from symbols
used in IEC 60617-7.
Symbol according to IEC 60617-7 Symbol at component
Circuit-breaker

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 2. Product description

Disconnector

Earthing switch

Tab. 2: High-voltage switchgear symbols

2.1.5. Product characteristics

The interconnection of the individual gas-insulated switchgear modules is designed to facilitate
future expansions and/or changes. Gastight partition insulators between adjacent gas compart
ments limit the impact of an internal fault in one gas-insulated switchgear module onto its
neighbors to an absolute minimum. The enclosure of the gas-insulated switchgear is made of
non-corrosive aluminum. Due to the light specific weight of aluminum, costly foundations are
no longer required.
The gas-insulated switchgear consists of a number of different modules. These individual mod
ules are interconnected by means of bolted flange connections. All flanges have identical di
mensions that allow a very flexible arrangement of the different modules to fit mostly all appli
cations.
Gas-insulated switchgear can be arranged in many different busbar layouts and they can be fit
to nearly any given physical layout of the substation and its surroundings. The "end" of a gas-
insulated switchgear can be chosen to fit to transformers, overhead lines, cables or other gas-
insulated switchgear.
Despite this large geometrical variability, the gas-insulated switchgear is built on a small num
ber of generic components. The variable arrangement of these components leads to the varia
bility of the overall gas-insulated switchgear. The generic components are described in the fol
lowing section.

2.2. Performance characteristics and technical data

Due to the modular design of gas-insulated switchgear the configuration and layout of gas-in
sulated switchgear varies according to the project-specific requirements. Additional modules
like fast-acting earthing switches, cable exits, bushings and so on may be installed. For meter
ing and supervising purposes devices like current or voltage transformers, arc sensors or parti
al discharge detectors can be added.
Therefore the performance characteristics of switchgear and its modules are project-specific
(Project specific documents [} 12]).

2.3. Gas equipment

The gas-insulated switchgear contains two different types of gas zones. In the circuit-breaker
SF6 is used both, as insulating as well as interrupting medium. In all other gas compartments
SF6 serves for insulation purposes only. All gas compartments are sectionalized by means of
gastight partition insulators.
All compartments of an SF6 gas-insulated switchgear installation are filled with SF6 gas of a de
fined gas density. Each individual gas compartment is equipped with studs for connection of a
gas density relay and non-return gas filling devices. Thus, all maintenance works on the gas
compartments, such as taking gas samples or regenerating gas, can be performed without any
loss of gas. The gas density is supervised by means of temperature-compensated gas density
relays.

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2. Product description

The SF6 gas equipment consists of:

̶ gas coupling
̶ density monitor
̶ adsorption filters
̶ pressure relief device

2.3.1. Gas coupling

For the filling of SF6 gas self-closing gas couplings are mounted to each gas compartment.
The gas coupling allows independent filling, emptying and evacuation of a gas compartment.

2.3.2. Gas density monitor

2
3
4

5
6

Fig. 2: Density monitor - schematic diagram

1 Density indicator (optional) 2 Micro-switches

3 Switch rod 4 Reference gas compartment
5 Metal bellows 6 Gas-filled compartment of installation

2.3.2.1. Function

Density of SF6-gas
NOTICE
Density of the SF6-gas is correctly displayed if there are no temperature differences between
gas compartment and density indicator. These conditions may not be fulfilled when the con
ductors of the product are energized.

Density monitors for SF6 gas supervise the gas density of each gas compartment of the switch
gear installation. The actual state of gas density can be monitored at the density indicator.
Control signals are transmitted via the micro-switches and provide status information about the
gas density for defined density ranges. Changes in gas density can generate alarm and block
ing signals according to the defined density ranges. The micro-switches are factory-set at
dropping density and must be evaluated for switchgear interlocking: The signals are available
at the interfaces of the operation mechanism.
The density monitor mechanically compares the defined gas density of a reference gas com
partment to the gas density of the gas compartment. Both compartments are enclosed by a
bellows system and therefore have a variable volume. A switch rod mounted to the bellows

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 2. Product description

system of the gas compartment connected to the gas compartment reacts to density differen
ces between the two compartments and galvanically actuates isolated micro-switches and a
visual density indicator.

2.3.2.2. Design
p
The density monitor is available in the following versions:
̶ without outdoor hood (indoor type)
̶ with outdoor hood (outdoor type)
Depending on the version, density monitors are equipped with a variable number of contacts.
Pressure comparison is provided by a metal bellow, which separates the SF6 gas compartment
of the installation from the reference gas compartment. The movement of the bellows actuates
micro switches via operating rod. The micro switches trigger the relevant indications through
different switching points.
Micro switches are connected to the pluggable terminal block contact via a printed circuit
board.
The movement of operating rod is indicated via a meter movement on a display visible from
the outside. For example as long as the pointer remains in the GREEN range of the scale, the
gas density is adequate. The transition GREEN-RED is set to the lowest switching point
(alarm).

2.3.2.3. Technical data

Data Value Unit
Ambient temperature -40 - +80 °C
Weight 1.1 kg
Tab. 3: Technical data - gas density monitor

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.3.3. Pressure relief device

2
3

6
5
4

Fig. 3: Pressure relief device (example)

1 Exhaust 2 Intermediate ring

3 Cross-over flange 4 Flange
5 Bursting disk (inside) 6 Protection cover (inside)
7 Cover

2.3.3.1. Function

Breaking bursting disk

DANGER
Switching operations with insufficient SF6 gas density may cause an electrical flashover and
breaking of a bursting disk within a pressure relief device. Breaking of a bursting disk releases
hot SF6 gas which may cause burns, releases solid and gaseous decomposition products of
SF6 gas which have toxic and corrosive properties.

4 Only operate the switchgear installation if the density of SF6 gas indicated at the density
monitors is in the operating range.

4 If the number and or nature of switching operations exceed the limits given within this
document, any further operation may cause bursting of a pressure relief device.

4 Observe the maintenance schedule to keep the product in its functional condition.

The pressure relief device has the task of initiating pressure relief if the gas pressure in the gas
compartments rises above the permitted pressure value. An increase of gas pressure may be
caused by an internal arc fault but never during normal operation of the switchgear.

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2.3.3.2. Design
Any separate gas compartment consisting of gas-insulated switchgear components is equip
ped with a pressure relief device. The pressure relief device is a safety element for the enclo
sures of SF6 switch systems. On the rare occasion of an internal arc, the gas pressure in a
compartment may increase to a level equal to the bursting pressure of the bursting disk. This
will trigger the pressure relief device followed by gas escaping through the exhaust. The pro
tective cover and cover plate protects the pressure relief device against accidental mechanical
damage from outside and from environmental conditions in the case of outdoor installations.
An adsorber is installed in every gas compartment to withdraw moisture from the SF6 gas.
Moisture in the SF6 gas may origin from diffusion into the gas compartment or moisture of built
−in components. The adsorber material is enclosed in a filter cage.
The pressure relief device contains an adsorber. The adsorber gathers moisture in the gas
compartment and thus maintains the quality of the SF6 gas.

2.3.3.3. Technical data

Data Value Unit
Bursting pressure (circuit-breaker) 1150 kPa rel 20°C
Bursting pressure (installation) 1150 kPa rel 20°C
Triggering precision ± 10 %
Diameter 102 mm
Weight 10 kg
Tab. 4: Technical data - pressure relief device

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

2.4. Busbar

2.4.1. Function
The busbar distributes the current within the switchgear. A busbar system is composed of the
individual busbar segments of each feeder. All busbars feature a single-phase enclosure
throughout the substation.
The gas-insulated switchgear can also be arranged as single busbar or double busbar, in an
H-circuit, as ring bus or in form of a 1½ breaker arrangement.

2.4.2. Design
The busbar conductors of each feeder are mounted on the gastight partition insulators that
separate the individual feeders. The busbar modules have a telescopic transversal installation
module for easier extensions. A spring-loaded lateral disconnecting element in the busbars is
used for compensating any pressure-related forces and changes in length induced by temper
ature gradients in long busbars.
The busbar conductors are interconnected by means of contact plugs in any standard connect
ing piece. Length variations due to temperature gradients, e.g. between the enclosure and the
individual conductors, are compensated in the plugs and will not cause any mechanical stress
on the insulators.

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2. Product description

2.5. Circuit-breaker

1 2 3 4 3

9 5 5
6 8 7 6

Fig. 4: Circuit-breaker section view (example)

1 Operating mechanism 2 Pressure relief device

3 Partition insulator 4 Metal enclosure
5 Earthing connection (example) 6 Support steel structure (example)
7 SF6 gas 8 Interrupting chamber
9 Connections for equipment on enclosure

2.5.1. Function
At the core of the switchgear system is the circuit-breaker with one chamber and an optimized
an compact layout.
̶ The circuit-breaker interrupts load currents and short-circuit currents.
̶ The circuit-breaker carries the load current and short-circuit currents for a short time.
̶ The circuit-breaker interrupts currents under out-of-phase conditions.
̶ The circuit-breaker manages the switching sequences O-CO or CO-CO.
̶ The circuit-breaker performs single phase auto-reclosing and single/three phase short-cir
cuit interruption.
The circuit-breaker uses the double-motion puffer TM operating principle. At high currents, the
pressure inside the puffer increases rapidly due to rising temperatures. This closes the puffer
valve. The energy needed now to extinguish the arc is produced by the arc itself. At low cur
rents, the puffer valve remains open and the circuit-breaker acts as a puffer breaker.
Double-motion puffer TM interrupters require far less operating energy than single-motion puffer
interrupters. Arcing contacts on both sides of the breaker are coupled by a gear and move in
opposite directions (double-motion), which minimizes mechanical reaction forces and further
reduces the necessary drive energy.

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 2. Product description

Operating principle

A B

5, 6
C D

9 8 7 4 3 2 1

Fig. 5: Functional principle of the interrupting chamber

1 Contact pin 2 Contact finger

3 Insulating nozzle 4 Contact ring
5 Auxiliary nozzle 6 Finger contacts
7 Puffer cylinder 8 Stationary puffing piston
9 Exhaust
A Switch position ON B Break movement
C Arc extinction D Switch position OFF

The schematic diagram shows the operating principle of a single interrupting chamber with the
puffer piston principle.
In the initial position (A) of the interrupting chamber in the rest position of switch position ON,
the contact ring (4) and the contact finger (2) form a single conducting unit.
During a break movement (B), the contact ring (4) separates from the contact fingers (2). The
gas volume in the puffing cylinder (7), which is traveling backwards, is continually reduced
through the stationary puffing piston (8) and the pressure of the enclosed gas is thereby in
creased until the arcing finger contacts (6) also separate from contact pin 1.
As a result of the separation (C), an electric arc is drawn out, which creates a further pressure
increase of the gas in the puffing cylinder (7) due to the effect of local heating from the short-
circuit current. Due to the increased pressure, the compressed gas flows along the electric arc
through the insulating nozzle (3), or in the other direction through the auxiliary nozzle (5). The
flow and the heat conducting ability of the SF6-gas drain the energy from the electric arc, and
thereby cause it to extinguish at the current zero transition.
The interrupting chamber is in the rest position of the OFF switch position (D).

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2. Product description

2.5.2. Design
The circuit-breaker consists of three single-phase breaker poles. Each pole consists of the op
erating mechanism, the interrupting column with one interrupting chamber and the enclosure
with the basic support structure.

2.5.3. Technical data

Data Value Unit
Height 1200 mm
Length (inclusive operating mechanism) 4557 mm
Width (without operating mechanism) 640 mm
Weight (inclusive operating mechanism) 932 kg
Gas volume 806 dm3
Tab. 5: Technical data - circuit-breaker

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2.6. Circuit-breaker operating mechanism

1 2 3

Fig. 6: Circuit-breaker operating mechanism (example)

1 Viewing port for the spring tension indicator 2 Disc spring column (inside)
3 Cover 4 Flange to operating piston, attached to the op
erating linkage
5 Position indicator 6 Viewing port for oil control

2.6.1. Function
The spring operating mechanism is composed of a charging system, an energy storage with
disk spring stack, an independent actuator piston and control valves, and auxiliary switches
and position indicators. A hydraulic energy control system is integrated within a compact and
sealed block that does not require any external piping.

Charging
A pump moves oil from the low-pressure oil reservoir to the high-pressure side of the energy
storage piston and compresses the disk spring stack. A micro switch stops the pump when the
disk spring stack is fully-charged.

Close operation
A magnetically-operated change-over valve initiates the close operation and connects the
high-pressure side of the energy storage piston to the actuator piston. Both sides of the actua
tor piston are connected to the high-pressure reservoir. Due to the different areas of both sur
faces of the actuator piston, the circuit-breaker closes and stays in a closed position.

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2. Product description

Open operation
the trip coil operates the change-over valve and connects the actuator piston to the low-pres
sure reservoir. The circuit-breaker opes and stays in an open position due to the difference in
pressure.

2.6.2. Design
The circuit-breaker uses a spring operating mechanism for operation. The mechanism com
bines the non-wearing properties of a hydraulic system with the robustness of mechanical
spring operating mechanisms.
This hydraulic spring operating mechanism combines a hydraulic drive with mechanical energy
storage in a set of heavy-duty disk springs. The disk springs are hydraulically charged to store
the drive energy. The contacts of the circuit-breaker are switched on respectively off by means
of a hydraulic cylinder. The hydraulic block features a closed loop for the hydraulic oil. Thus, it
has no operating mechanisms external hydraulic piping.

2.6.3. Technical data

For technical data refer to the operating manual of the operating mechanism.
For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.7. Disconnector-earthing switch

4
5

Fig. 7: Disconnector/earthing switch module (example)

1 Interface for drive 2 Enclosure

3 Insulator 4 Connection for equipment on enclosure
5 Moving contact system (inside)

2.7.1. Function
The disconnector-earthing switch is based on a modular design and features a single-phase
aluminum enclosure. It has identical components for all variants and incorporates an insulating
gap for the disconnector and one for the earthing switch.
The earthing switch connects isolated sections of the switchgear to the ground to protect per
sonnel during maintenance and assembly work.
disconnectors provide a safe insulating gap to isolate sections with different potential, for ex
ample busbar disconnectors, which isolate a feeder.
The positioning of the insulating distance in the centre of the enclosure makes the disconnec
tor highly reliable and provides an optimal dielectric shielding of the arc and the contacts.
The operating mechanims for the disconnector-earthing switch consits of housing and cover,
connectors for bay control, electronically controlled motor, intermediate gear unit, position en
coder and separate position indicators for earthing and disconnector contacts, control unit in
cluding interface module.

2.7.2. Design
A combined disconnector/earthing switch is incorporated between a busbar module and a cir
cuit-breaker and at the exit side of a bay. The drive mechanism and the mechanical linkage for
this disconnector/earthing switch is mounted directly on the gas-insulated switchgear enclo
sure.

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The motor works simultaneously on the three moving contacts via a common linkage, a gear
and an isolating rod. Depending on the direction of rotation, the contacts move either into the
disconnecting or the earthing or the neutral position. A separate hand crank allows the manual
operation of the combined disconnector/earthing switch.
The disconnector / earthing switch features different connecting variants. It can be equipped to
be either a combined disconnector / earthing switch or a disconnector or earthing switch only.
Furthermore, it features different connecting variants to give an overall of 8 different switchgear
variants in the same enclosure with the same drive.

2.7.3. Technical data

Data Value (max.) Unit
Lenght 1008 mm
Diameter 484 mm
Weight 183 kg
SF6 volume 219 dm3
Tab. 6: Technical data - disconnector-earthing switch

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.8. Fast-acting earthing switch

Fig. 8: Fast-acting earthing switch (example)

1 Hand crank cover 2 Fast-acting earthing switch drive (enclosure)

3 Earth connection (outside SF6-gas) 4 Enlosure connecting element

2.8.1. Function
Fast-acting earthing switches are able to ground induced currents on overhead lines, dis
charge larger capacitances such as cables, and provide safety when the opposite end of a line
is not properly de-energized.
̶ Fast-acting earthing switches earth sections of the live parts for protection of personnel dur
ing maintenance and overhaul work.
̶ Fast-acting earthing switches provide short-circuit current making capability.
̶ Fast-acting earthing switches provide short-circuit current carrying capacity in closed posi
tion.
̶ Fast-acting earthing switches switch induced capacitive and inductive currents.
̶ Fast-acting earthing switches allow insulated access to the conductors for measuring pur
poses.
The fast-acting earthing switch includes a spring operated mechanism, which is either charged
by a motor or by a hand crank. The operating mechanism of the fast-acting earthing switch is
located in the equipment itself and controlled via the control cubicle.

Close operation
In the open position the fast-acting spring attached to the opposite side of the drive shaft is
precharged. For closing operations the rotary movement of the drive shaft releases the fast-
acting spring mechanism and moves the moving contact to the closed position.

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2. Product description

Open operation
For opening operation the rotary movement of the drive shaft opens the moving contact and
simultaneously precharges the fast-acting spring mechanism for the next fast closing operation
of the moving contacts.

2.8.2. Design
The fast-acting earthing switch consists of:
̶ three metal phase enclosures
̶ two connecting tubes
̶ a spline shaft
̶ three moving earthing contacts
̶ fixed earthing contacts (mounted inside a disconnector or connection piece)
The fast-acting earthing switch can be mounted to the bottom of the disconnector module or
different connection pieces. Each vertically arranged moving contact of the earthing switch is
housed within a metal phase enclosure. The metal enclosures are connected by hollow metal
tubes encapsulating a common drive shaft for the moving contacts. Rotary movement of the
drive shaft actuates the moving contacts via an actuating lever. The drive shaft is connected
on one side to the drive via an operating linkage. The fixed earthing contact of the fast-acting
earthing switch is mounted inside the disconnector or different connection pieces. It is attached
to the holder for the moving contact of the disconnector.

2.8.3. Technical data

Data Value Unit
Height mm
Length (3 poles) mm
Width mm
Weight (inclusive operating mecha 142 kg
nism)
SF6 gas volume 109 dm3
Tab. 7: Technical data - fast-acting earthing switch

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.9. Connecting elements

1 2

4
7

Fig. 9: Connecting element (example)

1 Attachment flange 2 Housing

3 Flange 4 Contact support
5 Insulator 6 Conductor (inside)
7 Flange

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2. Product description

2 3 4
1

7
8

Fig. 10: Connecting element (example)

1 Flange 2 Housing
3 Attachment flange 4 Connections for equipment
5 Flange 6 Contact support
7 Insulator 8 Connections for equipment

Fig. 11: Connecting element (example)

1 Flange 1 2 Housing
3 Flange 2 4 Base insulator

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 2. Product description

4 2

Fig. 12: Connecting element (example)

1 Flange 1 2 Base insulator

3 Housing 4 Flange 2

5 3

Fig. 13: Connecting element (example)

1 Flange 1 2 Base insulator

3 Flange 2 4 Housing
5 Flange 3

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2. Product description

1
6

5 2

Fig. 14: Connecting element (example)

1 Current connection 2 Flange 1

3 Base insulator 4 Flange 2
5 Flange 3 6 Flange 4

2.9.1. Function
Connecting elements enable the switchgear to be customized to fit project requirements. There
are connecting elements in various shapes and sizes including elbow joints, t-elements, and
straight sections.

2.9.2. Design
The enclosure of the connection piece is bolted onto adjacent installation components with its
standard flanges. Open or closed insulators support the current-carrying parts arranged inside
the housing. The conductor is supported by the contact support, which is shielded by the
shield. Length, configuration and number of connection pieces are specified according to the
configuration of the installation. Specific variants of the connection piece having a rotating
flange or attachment possibilities for e.g. pressure relief device are available. The connecting
piece usually forms a common gas compartment with other installation components.

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2.9.3. Technical data

Data VW3 Value VT3 Value VX3 Value Unit
Installation length 615 720 720 mm
Height - - - mm
Length - - - mm
Width - - - mm
Weight per unit 57 88 100 kg
SF6 gas volume 85 127 143 dm3
Tab. 8: Technical data - connection piece

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.10. Separable connector

Fig. 15: Separable connector (example)

1 Flange 2 Current connection

3 Flange 4 Cylinder housing
5 Sliding housing 6 Insulator

2.10.1. Function
The separable connector is mounted between two installation components as a laterally re
movable connecting element, for example in a busbar section between two bays. This enables
the dismantling of the busbar between two bays without moving the bays. Dismantling is possi
ble lateral to the busbar axis.
The separable connector enables the opening and removal of connecting busbars on expand
ing the installation or on overhaul with a minimum of time and labor.
The separable connector provides a certain compensation for assembly tolerances. The maxi
mum permissible assembly tolerances between two parts of the installation are:
̶ Difference in length: ±10 mm
̶ Angular deviation: radial 1.5 mm, 0°

2.10.2. Design
The enclosure of the separable connector consists of an axial compensator and a cylinder
housing, which are telescoped in each other. Current connectors are attached to the axial
compensator and cylinder housing to carry the enclosure current. The separable connector
forms a common gas compartment with other installation components which need to have a
gas connection for gas filling, a density monitor for monitoring the gas density and a pressure
relief device.

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2.10.3. Technical data

Data Value Unit
Installation length 720 mm
Difference in length ± 10 mm
Angular deviation ±0 °
Weight per unit 100 kg
Gas volume 83 dm3
Tab. 9: Technical data - separable connector

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.11. Separable connector with integrated axial compensator

3
2 4
1

9 6

7
8

Fig. 16: Separable connector with integrated axial compensator (example)

1 Tie bar 2 Sliding section of enclosure

3 Guiding cylinder 4 Stud bolts
5 Flange 6 Current connection
7 Rubber bellow 8 Flexible current connection
9 Flange

2.11.1. Function
The separable connector with integrated axial compensator is mounted between two installa
tion components as a laterally removable connecting element, for example in a busbar section
between two bays. This enables the dismantling of the busbar between two bays without mov
ing the bays. Dismantling is possible lateral to the busbar axis.
The separable connector with integrated axial compensator enables the opening and removal
of connecting busbars on expanding the installation or on overhaul with a minimum of time and
labor.
The separable connector with integrated axial compensator provides a certain compensation
of mounting tolerances and thermally expansion of busbars. The maximum allowable deviation
between two parts of the installation are:
̶ Difference in length: ±13 mm
̶ Axial mounting tolerance: ±2 mm
̶ Angular deviation: ±1°

2.11.2. Design
The enclosure of the separable connector with integrated axial compensator consists of an ax
ial compensator and a cylinder housing, which are telescoped in each other. The tie bars draw
together the two enclosure elements and thus counteract the gas pressure forces in the axial
direction. The forces on the structure are reduced to a minimum. Current connectors are at
tached to the axial compensator and cylinder housing to carry the enclosure current. The sepa

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 2. Product description

rable connector with integrated axial compensator forms a common gas compartment with oth
er installation components which need to have a gas connection for gas filling, a density moni
tor for monitoring the gas density and a pressure relief device.

2.11.3. Technical data

Data Value Unit
Installation length 720 mm
Difference in length ± 13 mm
Axial mounting tolerance ±2 mm
Angular deviation ±1 °
Weight per unit 170 kg
Gas volume 83 dm3
Tab. 10: Technical data - separable connector with integrated axial compensator

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.12. Parallel compensator

8 2

7
3

5 6 5

Fig. 17: Parallel compensator (example)

1 Threaded rod 2 Flange

3 Contact support 4 Insulator
5 Sliding housing 6 Housing
7 Conductor 8 Flange

2.12.1. Function
The parallel compensator unit is mounted between two installation components to cope with
parallel tolerances which may occur, for example when connecting a transformer.
This allows tolerances between the two components during installation or during operation.
The maximum allowable tolerances are:
̶ Angular deviation: ±3°

2.12.2. Design
The enclosure of the parallel compensator consists of two flange housings and a tubular hous
ing. The two flange housings support by means of O-rings, the tubular housing, which is cen
tered in the axial center position by compression springs. The enclosure is held together by
threaded rods. The flange housings are bolted to the adjacent installation components.
Open or closed insulators support the current-carrying parts arranged inside the housing. The
conductor is supported by the contact supports, which are bolted to the insulators.
The current conductors are attached to the flange housing and to the tubular housing to carry
the enclosure reverse current.

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2.12.3. Technical data

Data Value Unit
Installation length (fixed) 720 mm
Installation length (size minimum) 820 mm
Installation length (size maximum) 3930 °
Weight per unit (fixed) 123.5 kg
Weight per unit (size minimum) 99.3 kg
Weight per unit (size maximum) 452 kg
Gas volume (fixed) 79 dm3
Gas volume (size minimum) 99.3 dm3
Gas volume (size maximum) 452 dm3
Tab. 11: Technical data - parallel compensator

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.13. Current transformer

1
2

Fig. 18: Current transformer (example)

1 Flange 2 Insulator
3 Current transformer 4 Terminal box
5 Flange

2.13.1. Function
Current transformers provide metering, control, and protection functions.
Current transformer parameters such as burden, ratio, accuracy class and transient perform
ance are set to meet specific project requirements. Multi-ratio transformers provide different ra
tios selectable by taps.

2.13.2. Design
The current transformer is a ring-core type. The ring-cores are mounted concentrically to the
primary conductor tube, so that the secondary windings are interlinked magnetically with the
primary current and are insulated from high voltage.
The current transformers are connected to various types of protection and measuring equip
ment and the specific requirements are accordingly multiple. In principle the current transform
ers can be assigned to two applications: Measuring and Protection. For both applications, in
ternational standards for its accuracy class are defined.
The primary conductor tube is situated in the gas compartment of the enclosure. The cores are
situated outside the gas compartment on the ring-core support and are at earth potential. The
core support flanges protect the cores from earthing arcs. This design provides an exceptional
reliability since the insulating medium gas is not subject to aging.

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The current transformer has the task of converting the primary current into a proportional sec
ondary current of the same phase and frequency. These secondary currents are required in
the installation for the purposes of protection and measurement.
The ring-core support is part of the gas-insulated switchgear enclosures. The phase return cur
rent is prevented from flowing inside the ring cores by means of an insulation. Sheet casing
carries the enclosure return current and protects the cores from contamination and damage.
The ring cores are mounted on the ring-core support. As the secondary windings are located
outside the gas compartment, no secondary leads through the gas-insulated switchgear enclo
sure are necessary. The connecting wires of the secondary windings are collected in a com
mon weatherproof terminal box.

2.13.3. Technical data

Data Value (max. depending on type) Unit
Height 1080 / 720 mm
Diameter 710 mm
Weight per pole max. 600 kg
Gas volume 73 / 111 dm3
Tab. 12: Technical data - current transformer

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2.14. Voltage transformer

3 4

Fig. 19: Voltage transformer (example)

1 Flange 2 Housing
3 Pressure relief device 4 Secondary terminal box
5 Primary terminal

2.14.1. Function
Voltage transformers provide metering, control, and protection functions.
Inductive voltage transformers are low power transformers in which the secondary voltage is
proportional to and in phase with the primary voltage within the specified voltage range. The
voltage transformer of the gas-insulated switchgear transforms the high voltage to be meas
ured into a secondary voltage that can be fed to measuring and protective devices. At the
same time, the primary and the secondary windings are galvanically separated from each oth
er.

2.14.2. Design
The enclosure of the voltage transformer consists of a housing and base plate, which are bolt
ed together.
The gas compartment contains the voltage transformer unit. This consists of an iron core car
rying the primary and the secondary winding.
The high-voltage electrode embedded in the insulator is connected to the high-voltage connec
tion on the transformer side via a flexible conductor.

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The insulator seals the gas compartment of the voltage transformer against the gas compart
ment of adjacent components. Thus, the voltage transformer has its own, enclosed gas com
partment.
̶ Gas filling is done via the gas connection
̶ Gas density monitoring is done using the density monitor
̶ Pressure relief is assumed by the pressure relief device, which is mounted on the base
plate. Its bursting pressure is adapted to the operating pressure of the installation.
The secondary windings and the output conductor of the primary winding on the low-volt
age side (end of primary winding) are led out of the gas compartment through a gastight
multiple bushing, into the splash-proof terminal box. In the terminal box, they are connect
ed to a terminal block. The terminal block provides connections for protective and measur
ing equipment.
The terminal blocks are mounted on an earthing bus. Specific earthing terminals serve to
earth the secondary circuits and the end of the primary winding that is marked according
to VDI standard with X, according to IEC standard with N. The terminal designations are
given on the diagram plate inside the cover of the terminal box.

2.14.3. Technical data

Data Value (max.) Unit
Height 1420 mm
Diameter 790 mm
Width - mm
Depth - mm
Weight per pole 600 kg
Gas volume 370 dm3
Tab. 13: Technical data - voltage transformer

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.15. Surge arrester

2 3

4
1 5
6
7

Fig. 20: Surge arrester (example)

1 Transport cover 2 Insulator

3 Surge arrester 4 Pressure relief device
5 Bushing segment 6 Density monitor gas coupling
7 Ground terminal

2.15.1. Function
Surge arresters are fully-enclosed metal components that limit switching and lighting over-vol
tages. The gas-insulated switchgear is equipped with gas-insulated metal-oxide surge arrest
ers.
Surge arrester parameters such as discharge classes are set to meet project-specific require
ments.

2.15.2. Technical data

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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 2. Product description

2.16. Insulator

1
2

Fig. 21: Support insulator (example)

1 Insulator 2 Ring
3 Conductor connection 4 Through holes

1 2
3

Fig. 22: Partition insulator (example)

1 Insulator 2 Ring
3 Conductor connection

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2. Product description

2.16.1. Function
The gas-insulated switchgear is sectionalized into individual gas compartments by means of
gastight partition insulators. By this, the impact of extensions or internal faults on the overall
installation is reduced to a minimum, and control, supervision and maintenance are greatly
eased. All flange connections are sealed by means of age−resistant O-rings. Due to the gas
tight design of the insulator no gas leakage between components can occur.
Support insulators are used to mechanically support the conductors. They are mainly used for
long busduct connections.

2.16.2. Technical data

Data Value, Unit
Diameter 550 mm
Weight per unit 24.9 kg
Tab. 14: Technical data - partition insulator

Data Value, Unit

Diameter 550 mm
Weight per unit 20.9 kg
Tab. 15: Technical data - support insulator

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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 2. Product description

2.17. Adapter

1 2 3 4

Fig. 23: Adapter (example)

1 Insulator 2 Flange
3 Reduction piece 4 Flange

2.17.1. Function
The adapter is a rigid current connection. It is used to connect components of different ELK
product families, having different phase spacing. For this purpose the adapter consists of three
pieces for the three phases, one straight piece for the center phase and two double−bent
pieces for the outer phases. Each adapter−piece provides two standard flanges for the con
nected ELK products.

2.17.2. Design
Each adapter−piece consists of:
̶ a metal enclosure encapsulating
̶ a connecting conductor mounted between
̶ one partition insulator for the actual product
̶ one partition insulator for the connected product
̶ gas equipment

2.17.3. Technical data

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.18. Local control cubicle

Fig. 24: Local control cubicle (example)

2.18.1. Function
The local control cubicle (LCC) includes all required functions for the control, signaling and in
terlocking of the gas-insulated switchgear bay. The devices are connected by means of de
vice-specifically coded multiple connector plugs that can not be mixed-up among each other.

2.18.2. Design
The LCC is usually integrated and located on top of the operating mechanism housing. As an
integral part of the gas-insulated switchgear, the LCC is wired, factory-tested and shipped to
gether with the bay as one transport unit.
For special purposes there is a stand-alone control cubicle (SCC) which is located outside of
the bay. Connections from the density monitor, operating mechanisms, and drives are wired
via the operating mechanism cabinet. Current and voltage transformers are the only compo
nents which are directly connected to the SCC.
Connections from the LCC/SCC's prepared terminal blocks to dedicated protection cubicles,
control systems, power supply, and inter-bay wiring are done on site.

2.18.3. Technical data

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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 2. Product description

2.19. End cover

4 5 2
3

Fig. 25: End cover overview (example)

1 Cover 2 Connection for equipment on enclosure

3 Connection for equipment on enclosure 4 Connection for equipment on enclosure

2.19.1. Function
The end cover serves as a cover to shut gas compartments tightly. It is employed in different
sizes and shapes and can be equipped with gas equipment and equipment on enclosure.

2.19.2. Design
The end cover is employed in different sizes and shapes, as
̶ Small flat cover, without attachment possibilities
̶ Large flat cover, without attachment possibilities
̶ Large attachment cover, with attachment possibilities (e.g. density monitor, pressure relief
device, service and monitoring equipment)

2.19.3. Technical data

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.20. Bushing

4 5 6

1 2

Fig. 26: Bushing (example)

1 Conductor support 2 Contact tube

3 Bushing 4 Gas end plate
5 Shield 6 Current connection (not shown)

2.20.1. Function
SF6-to-air bushings are designed for the insulation of electric conductors which carry currents
at high voltage through a grounded housing. Bushings serve as links for the current transfer
between the gas−insulated switchgear and the air−insulated components of the open−air
transmission line or to air-oil bushings on power transformers. They have the task of transfer
ring the current with low losses and simultaneously of ensuring the dielectric strength both in
the gas compartment and in the air under the most extreme environmental conditions.
Bushing parameters such as creepage distance, length, and shape are set to meet specific
project requirements.

2.20.2. Design
The bushings can be carried out with composite housings as well as with porcelain housings.
The gas-insulated composite bushings with silicone sheds are characterized by simple con
struction and excellent resistance against external contamination.

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 2. Product description

2.20.3. Technical data

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.21. Cable-termination

Fig. 27: Cable termination (example)

1 Connection piece enclosure (example) 2 Enclosure

3 Cable termination provided by cable supplier 4 Transport protection cover
(inside)
5 Current connection (inside)

2.21.1. Function
The cable-termination is the direct connection (current transmission) between the gas-insulat
ed switchgear and the high voltage cable. The cable-termination enables the disconnection of
the gas-insulated switchgear from the high voltage cable (isolating distance) for testing the
gas-insulated switchgear or the high voltage cable.

2.21.2. Design
The enclosure of the cable connection forms a common gas compartment with other installa
tion components. The gas connection, the density monitor and the pressure relief device are
located at one of the adjacent components.
The interface complies with the IEC requirements for fluid-filled or dry-type cable terminations.
The scope of supply includes all items of the cable-termination and all necessary mounting
parts, but not the cable connection itself. The base plate (transport protection) of the enclosure
is removed on-site when mounting the cable termination.
Due to the variety of cable suppliers, there are different types of cable connections available.

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 2. Product description

2.21.3. Technical data

Data Value Unit
Rated voltage 420 kV
Rated power frequency withstand 650 kV
voltage, 1 min.
Rated lightning impulse withstand 1425 kV
voltage, 1.2/50 µs
Rated switching impulse withstand 1050 kV
voltage, 250/2500 µs
Rated frequency 50/60 Hz
Rated current 3150 A
Minimal pressure 450 kPa abs, 20°C
Maximal DC voltage for cable test, 770 kV
15 min.
Gas volume 348 dm3
Tab. 16: Technical data - cable connection

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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2. Product description

2.22. Transformer connection

7 3

4
6

Fig. 28: Transformer connection (example)

1 Connection piece enclosure (example) 2 Reduction piece

3 Conductor flange compensator 4 Enclosure
5 Flange to transformer bushing 6 Spring element
7 Bellow

2.22.1. Function
Transformer connections link power transformers directly to the switchgear via gas-insulated
bus ducts. Vibrations, thermal expansion of the transformer and switchgear, as well as move
ments resulting from the settling of foundations, are compensated by bellows and expansion
joints. A removable high-voltage conductor link isolates the transformer for testing.

2.22.2. Design
The enclosure of the transformer connection forms a common gas compartment with other in
stallation components. The gas connection, the density monitor and the pressure relief device
are located at one of the adjacent components.

2.22.3. Technical data

Data Value Unit
Installation length 1530 mm
Weight per unit 324 kg
Gas volume 374 dm3
Tab. 17: Technical data - transformer connection

For the project specific technical data and performance characteristics refer to the document
Project specific data or the List of rating plates (Project specific documents [} 12]).

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 3. Safety information

3. Safety information
The safety instructions in this section must be read and understood by all readers. This section
provides safety messages that apply to the general use of the product and multiple sections of
the document. Further safety instructions are assigned to the sections, where they are applica
ble.

3.1. Product safety

The production of the product complies with valid international standards, dangerous situations
might nevertheless arise.
The product must only be used in a faultless condition, under consideration of the operating
instructions and the project specific documents. Operation and operating of the product must
only be carried out by trained Routine Operation/Maintenance technicians.
Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.
̶ Important information about this document [} 9]
̶ Project specific documents [} 12]
̶ Obligations of the plant officer and operating company [} 64]
̶ Intended use [} 16]

3.2. Hazardous areas

Definition of hazardous areas

Hazardous areas are not only defined by their dimensions but also by the life cycle itself, as
they vary during the product life cycle according to:
̶ the location of the product
̶ the energization status of the product

Hazardous areas during operation

When in operation, the switchgear can switch at any time. Protective covers must not be re
moved during operation!

Procedure

1. Observe all safety warnings in these instructions.

2. Pay particular attention to the following components:

housing of the product, cover of the hydraulic spring storage drive, bursting disk

3.3. Product specific hazards

Due to plant specific conditions the resultant risks cannot generally be specified and the risks
can vary from plant to plant.

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3. Safety information

Hazardous voltages
DANGER
In case of internal failures in conjunction with failure of the protection system hazardous voltag
es are present at all components of the installed product. Electric flashover, transient overvolt
age, excessive temperatures, and toxic SF6 decomposition products might lead to fatal injuries.

4 Operation, maintenance and repair must be carried out by trained and certified personnel
only.

Breaking bursting disk

DANGER
Switching operations with insufficient SF6 gas density may cause an electrical flashover and
breaking of a bursting disk within a pressure relief device. Breaking of a bursting disk releases
hot SF6 gas which may cause burns, releases solid and gaseous decomposition products of
SF6 gas which have toxic and corrosive properties.

4 Only operate the switchgear installation if the density of SF6 gas indicated at the density
monitors is in the operating range.

4 If the number and or nature of switching operations exceed the limits given within this
document, any further operation may cause bursting of a pressure relief device.

4 Observe the maintenance schedule to keep the product in its functional condition.

Hazardous supply voltages

WARNING
Assemblies of the product are energized with hazardous voltages. Contact with live parts can
lead to death or severe injuries.

4 Do not remove any protective covers if an assembly is energized.

Noise along with switching operations

CAUTION
The hydro-mechanical spring operating mechanism can operate at any time. Unexpected
switching operations can cause hearing damages.

4 Wear hearing protection during operation.

Hot surfaces
CAUTION
During operation of the product the surfaces of the enclosure can gradually heat up to the
maximum temperature of 70°C.

4 Take care when touching the enclosure at any time.

3.4. SF6 gas hazards

Shortage of oxygen
WARNING
SF6 gas is heavier than air and will accumulate underfoot or in unventilated rooms of lover lev
els where it will displace atmospheric air, with the result that people entering these rooms can
be endangered by unconsciousness and suffocation.
Gas masks do not protect against shortage of oxygen!

4 Check rooms which can be contaminated with SF6 gas before entering.

4 If the safety of the room atmosphere cannot be established, self-contained breathing

equipment must be used.

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 3. Safety information

Solid and gaseous products of decomposition

WARNING
Arcing induced in SF6 gas switching operations leads to the formation of solid and gaseous
products of decomposition. The solid decomposition products form aggressive acids when
coming into contact with atmospheric humidity or water and on contact with the body, especial
ly skin and eyes. Because products of decomposition can be present, used gas must be con
sidered as potentially toxic and corrosive.

4 Observe the procedures for storage, transportation, and the use of filling equipment.

4 Wear the personal protective equipment: respirator mask (self-contained breathing equip
ment if necessary), protective overall, protective gloves, safety shoes, safety glasses.

Greenhouse effect of SF6 gas

NOTICE
SF6 gas contributes to the greenhouse effect.

4 Observe the instructions for handling and storage.

4 Avoid the release of any SF6 gas into the atmosphere.

Products of decomposition
NOTICE
The gaseous decomposition products of SF6 gas are largely adsorbed by the installed filters
within a few hours of normal operation. The solid decomposition products, so-called switching
dust, mainly metal fluorides and tungsten oxifluorides, form aggressive acids when coming into
contact with atmospheric humidity or water.

4 Switching dust and its products of reaction must not escape into the environment.

4 Switching dust and its products of reaction must be appropriately disposed, if necessary
by a professional company.

4 Wear the personal protective equipment: respirator mask (self-contained breathing equip
ment if necessary), protective overall, protective gloves, safety shoes, safety glasses.

3.5. Requirements for working with SF6 gas

̶ To prevent any incidents the recommendations given in IEC 60376, IEC 60480, and IEC
61634 must be followed.
̶ Observe safety concepts and legislatory regulations (Safety recommendations and standard
procedures [} 62]).

3.5.1. Requirements on the staff

Staff working with SF6 gas-insulated switchgear must:
̶ be familiar with health and safety concerns for SF6 gas
̶ be familiar with the characteristics and the handling of SF6 gas
̶ have been trained in risk avoidance for all aspects in handling of SF6 gas
̶ be familiar with the handling and disposal of decomposition products of SF6 gas
̶ have access to personal protective equipment
̶ be familiar with necessary first aid measures

3.5.2. Requirements on the working environment

Requirements on the working environment in which SF6 gas-insulated switchgear is worked
on.

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3. Safety information

̶ The working environment must be well-ventilated.

̶ The working environment must be dust-free.
̶ The working environment must have an air humidity of less than 70%.

3.5.3. Handling and storage requirements

Heated pressurized gas containers
DANGER
Excessive warming of pressurized gas containers during storage and transport can result in
explosion.

4 Follow the supplier’s instructions and observe the following conditions for storage and
transportation:

4 Store gas container in a dry, well-ventilated room.

4 Store gas container separately from inflammable or explosive materials.

4 Do not expose gas container to direct sunlight.

4 Observe the maximum ambient temperature of 50° C to which the containers can be sub
jected.

4 Take into account the design pressure and the SF6 gas density.

4 Always secure the valve with a protective cap or protective shroud.

4 Store the pressurized container above floor level to avoid contact with moisture.

4 If the pressurized container is stored upright: the valve must be at the top. Secure the gas
container against falling.

3.6. Working with SF6 gas

Due to legislative or international regulations and laws, persons working with SF6 gas can be
obliged to prove that they are familiar with health and safety concerns for SF6 gas and have
been trained in risk avoidance for all aspects in handling of SF6 gas.
This proof will be confirmed by national or international authorities by a personalized certifi
cate.

3.6.1. Reclaiming gas

Expanding gas
CAUTION
Contact with expanding gas during reclaiming can result in frostbite.

4 Carefully observe the instructions for storage, transportation and the use of filling equip
ment.

4 Wear the personal protective equipment.

3.6.2. Filling with gas

Expanding gas
CAUTION
Contact with expanding gas during reclaiming can result in frostbite.

4 Carefully observe the instructions for storage, transportation and the use of filling equip
ment.

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 3. Safety information

4 Wear the personal protective equipment.

Overpressure
NOTICE
Filling the gas compartments without overpressure limitation can destroy the pressure relief
device and the switchgear equipment.

4 Only fill SF6 gas with a valve which is equipped with an overpressure limitation.

3.7. Product protection

Fragile equipment
NOTICE
The equipment or parts thereof can be damaged by your weight.

4 Do not step on protruding parts of the equipment.

4 Do not step on any components of the installation.

Insufficient gas density

NOTICE
In addition to insulating and quenching functions an adequate gas density is necessary to ab
sorb mechanical forces. Operations with insufficient gas density damage the mechanics of the
circuit-breaker even if no loads are switched.

4 Only operate the product if the gas density is within the operating range.

Pollutants and moisture

NOTICE
Pollutants and moisture might damage the product.

4 Do not expose the product to environmental conditions incompatible with those specified
in the project specific documents.

4 Do not unpack the product unless adequate environmental conditions can permanently be
provided.

4 Pack the product if it is already unpacked and adequate environmental conditions cannot
permanently be provided.

3.8. Product safety signs

3.8.1. Protective earth sign

The sign for protective earth connection indicates possible earthing points.
The earthing points are marked at the circuit-breaker supports.
Bay support structure (if applicable) and circuit-breaker support must be earthed separately.
Further earthing points for components, which are not mounted to the bay (for example ca
ble connection, connecting elements or bushings) are given in the documents of the respec
tive project.

Fig. 29: Protective earth sign

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3. Safety information

3.8.2. Hazardous voltages sign

High voltage signs indicate that hazardous voltages are present inside of the product enclo
sure. If parts of the enclosure are opened or removed, electric flashover to personnel and
objects can lead to death.

Procedure
4 Do not open or remove any parts of the enclosure if they are energized.

3.8.3. Arc appearance sign

Fig. 30: Hazardous voltages sign

Switching operations may produce arcs. During visual inspection of the position of a switch
ing element it may be operated and thus produce an arc. Looking into an arc can perma
nently impair the eyes and the ability to see!
Arc appearance symbols are placed on viewing ports of the gas-insulated switchgear.
Viewing ports are provided for disconnectors and earthing switches. They allow visual
checking of the actual position of each switching element. To protect the inspection glass of
the viewing port the glass is protected by a removable cover.
Fig. 31: Arc appearance sign

Procedure

1. Do not look through a viewing port when the switching element is operated!

2. De-energize and earth the switching element before looking through a viewing port.

3.9. Safety recommendations and standard procedures

To avoid electrical hazards ABB recommends to comply with the “seven safety rules” for
working on electric installations. To avoid hazardous situations ABB recommends to install
standard procedures such as a suitable “permit to work system” with regular reviews and au
dits.

3.9.1. Safety first

̶ I give full attention to my work and do not rush.
̶ I observe the safety rules according to EN 50110 (7 steps that save lives [} 63]).
̶ I know all relevant health and safety rules and observe these at all times.
̶ When performing new or routine tasks I ask myself: “Is this safe?”, and discuss them with
my colleagues.
̶ I make my supervisor aware of hazards, behaviors, and barriers that prevent me or other
persons from working safely.
̶ I pay attention to my safety and the safety of my colleagues.
̶ I take the safety advice of my colleagues and supervisors seriously.
̶ As a supervisor, I make sure that my employees and other persons work safely, and sup
port them in doing so.
̶ My own behavior is a model for safe and reliable working.

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 3. Safety information

3.9.2. 7 steps that save lives

The system (installation) must be regarded as being under voltage during checking if the
system is free of voltage, and during earthing and short-circuiting (Protective Precautions).

3.9.2.1. Clearly identify the work location

̶ Identify safe working areas throughout the course of planned work. A sufficient number of
warning labels, all necessary schematics and plans must be available in order to clearly
identify and mark the locations.
̶ Attach warning labels to all neighboring installation parts (to be removed after the works
have been carried out).
̶ Check again that the correct work location has been identified.

3.9.2.2. Switch off the voltage supply and disconnect all sites
̶ Disconnect all possible sources of supply.
̶ Provide proper electrical clearance as required by interlocking rules. Mark e.g. main cir
cuits and control circuits with appropriate tags.

3.9.2.3. Protect against re-connection

̶ Safeguard disconnecting devices against unauthorized re-connection.
̶ Block off live parts with a marker tape.
̶ Mark locks and circuit-breakers with warning labels.
̶ Keep keys in a secure place.

3.9.2.4. Verify that the installation is dead

̶ Use a proper test instrument (observe voltage level).
̶ Check the functions of the test instrument before testing.
̶ During the test: Take precautionary measures to keep clear of the connections.
̶ Measure all phases against earth.
̶ Re-check the functions of the test instrument after the test.

3.9.2.5. Carry out earthing and short-circuiting

̶ In high voltage systems: Earth the equipment by a fully rated earth switch and short-cir
cuit.
̶ Earthing and shorting for low voltage systems can be dispensed with. However only if
there is no risk of voltage transmission (capacitive and inductive) or backfeed (e.g. stand-
by unit).

3.9.2.6. Protect yourself against adjacent live parts

̶ Block off neighboring live parts with screens, insulating mats or spacer grids in order to
prevent unintended contacts.

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3. Safety information

3.9.2.7. Issue a permit to work

̶ The plant officer and operating company signs the permit to prove that the equipment is
handed over in a safe condition.
̶ The person receiving the permit (certified technician) signs the permit to confirm that he /
she has understood the content, he / she is responsible to keep a safe work location.
̶ The permit to work only expires after it is canceled. Clearance and cancellation must be
signed by the person receiving the permit and the plant officer and operating company
(Permit to work system [} 64]).

3.9.3. Permit to work system

The permit to work system represents a written and formalized process to reduce risks.
The permit must at least specify:
̶ the persons responsible for the overall permit and for individual steps of the permit to
work
̶ the time for which the permit is valid
̶ any permitted time extension to complete the work
̶ details of the work to be carried out
̶ where the work must be carried out
̶ any limitations on the work, the work location, or the equipment
̶ details of the controls and precautions required
̶ emergency procedures
̶ the individual responsibilities
̶ how the permit is to be canceled

3.10. Obligations of the plant officer and operating

company
Legislatory regulations and guidelines of the plant officer and operating company regarding
work safety and accident prevention must be strictly observed. The plant officer and operat
ing company must ensure that all valid safety requirements are met at any time. The obser
vation of the valid applicable standards must be ensured. The allocation of rights and duties
for self-dependent realization of tasks is the responsibility of the plant officer and operating
company. Manual operation and operating of the product must be carried out by Routine Op
eration/Maintenance technicians.
It is not allowed to modify the product.
Inform ABB about malfunctions and damages of the product.
ABB Switzerland Ltd
High Voltage Products
Brown Boveri Strasse 5
CH-8050 Zurich / Switzerland
Hotline 24 hours service: +41(0)844 845 845
Telphone business hours: +41 58 588 31 86
Telefax: +41 58 588 17 22
E-Mail: gis.service@ch.abb.com

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 3. Safety information

3.10.1. Minimization of residual risks

Despite technical and design measures residual risks remain. ABB recommends to establish
a standard procedure by implementing an access authorization scheme, including:
̶ physical means, such as barriers with warning signs
̶ systematic means, such as permit to work, safety precautions, the seven safety rules
̶ personnel means, such as personal protective equipment, training, skills, knowledge

3.10.2. Safety precautions

Electromagnetic radiation
WARNING
Low frequency electromagnetic radiation can cause malfunction in cardiac pacemakers, which
can lead to death.

4 Persons wearing cardiac pacemakers must not be admitted.

Electromagnetic radiation
CAUTION
Low frequency noise signal can cause malfunction in hearing aid devices.

4 Persons wearing hearing aids must turn off the hearing device.

ABB recommends to establish an access authorization scheme.

̶ Access for authorized personnel only
̶ Access for reasons of health: persons with devices sensitive to electromagnetic interference
(cardiac pacemakers, hearing aids, and so on) must not stay nearby the product.

3.10.3. Safety measures

ABB recommends to establish a standard procedure by implementing safety requirements and
precautions. The standard procedure must include regular and repeated training of personnel.

3.10.4. Personnel instructions

The allocation of rights and duties for self dependent realization of tasks is the responsibility of
the plant officer and operating company. The operating instructions must be read and under
stood.

3.10.5. Personal protective equipment

Personal protective equipment must be used in addition to other practicable control means
when all other means of preventing or controlling the risk are insufficient. The legal regulations
for occupational health and safety plus the guidelines of the plant officer and operating compa
ny apply.
The plant officer and operating company must provide personal protective equipment.
̶ respirator mask; if necessary self-contained breathing apparatus (for example for gas han
dling)
̶ safety helmet
̶ protective overall
̶ protective gloves

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3. Safety information

̶ safety shoes
̶ safety glasses
̶ hearing protection
̶ safety system for work at height

3.10.6. Emergency information

Legislatory regulations and the guidelines of the plant officer and operating company for occu
pational health and safety apply.

3.10.7. First aid

The directives of the plant officer and operating company for first-aid-measures are effective.

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 4. Operating elements

4. Operating elements
Operating elements for the normal operation are only located on the local control cubicle.
Operating elements of the local control cubicle are described in a separate document for the
control cubicle (Project specific documents [} 12]).
Operating elements for local operation of switching elements are located at the drives.

4.1. Fast-acting earthing switch

1 2

48

Fig. 32: Fast-acting earthing switch; cover

1 Fast-acting earthing switch drive 2 Hand crank cover

3 Cover 4 Padlock locking the cover
5 Position indicator

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4. Operating elements

1 2 3

48

6 5 4

Fig. 33: Fast-acting earthing switch operating elements

1 Locked position 2 Selector switch

3 Position for electrical control 4 Hand crank operation to open contact (coun
ter-clockwise)
5 Hand crank operation to close contact (clock 6 Hand crank opening
wise)
7 Position for manual operation

68 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 4. Operating elements

1 2

6 M

48

4 3

Fig. 34: Selecting operation mode

1 Selector switch 2 Remote position

3 Turn direction 4 Hand crack insertion
5 Earthing position 6 Locked position

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 69 / 140
4. Operating elements

4.2. Disconnector-earthing switch

1 2

8
7 3
6 4

Fig. 35: Operating elements (example)

1 Position for manual operation of the discon 2 Position for electrical control (optional)
nector
3 Hand crank operation to close earthing switch 4 Hand crank operation to close disoconnector
contact (clockwise) contact (counter-clockwise)
5 Hand crank opening 6 Hand crank operation to open disconnector
contact (clockwise)
7 Hand crank operation to open earthing switch 8 Position for manual operation of the earthing
contact (counter-clockwise) switch
9 Blocking position

70 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 5. Indicating elements

5. Indicating elements

5.1. Viewing port for the switching position

1
2
3

Fig. 36: Inspection window for the switching position (example)

1 Inspection window with blind plug - disconnec 2 Arc appearance symbol on inspection window
tor (example)
3 Viewing port - open contact (example) 4 Viewing port - closed contact (example)
5 Inspection window with blind plug - earthing
switch (example)

Arc appearance during visual inspection

WARNING
Switching operations may produce arcs. During visual inspection of the position of a switching
element the switching element could be operated and thus produce an arc. Looking into an arc
can permanently impair the eyes and the ability to see!

4 Arc appearance symbols are placed on viewing ports of the Gas Insulated Switchgear. Do
not look through a viewing port when the switching element is operated!

Viewing ports are provided for disconnectors and earthing switches. They allow visual check
ing of the actual position of each switching element. To protect the inspection glass of the
viewing port the glass is protected by a removable cover.

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 71 / 140
5. Indicating elements

5.2. Gas density monitor

1 2

Fig. 37: Density indicator of the density monitor (example)

1 Range for operating density 2 Pivoting indicator needle

3 Display for density indication 4 Range for blocking density
5 Range for alarm density

A gas density monitor is available for each gas compartment. It is provided with a circular ar
ranged indication field displaying the relevant ranges of gas density. The actual gas density
within a gas compartment is indicated by a pivoting indicator needle.
The change from one density range to the next marks the switching points for blocking and
alarm density. The switching points correspond to the settings of dropping density for the micro
switches at the critical pressure values in kPa abs. at 20 °C.
Within the green range the position and value for the rated filling pressure is marked.
Gas pressure varies by temperature, gas density does not. If the ambient temperature for the
measurement is not taken into consideration, this might lead to a wrong filling pressure. Al
ways take into consideration the ambient temperature (shade) for the measurement according
to the table for temperature correction.
The gas density is displayed on the gas density monitor as follows, if not otherwise specified
(Project specific documents [} 12]).

Color indication Gas density

Indication range GREEN Operating range
Indication range GREEN (YELLOW) Operating range. Gas density has fallen below alarm
density.
Indication range RED Blocking range. Gas density has fallen below minimum
functional density. Switching elements within a gas
compartment must not be operated.

72 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 5. Indicating elements

5.3. Spring indicator

1 2

Fig. 38: Inspection window for the spring travel of the operating mechanism (example)

1 Indicator for tensioned hydraulic spring operat 2 Indicator for untensioned hydraulic spring oper
ing mechanism ating mechanism
3 Indicator strip which marks the actual extend to
which the hydraulic spring operating mecha
nism is charged.

The indicator for the spring travel is visible through an inspection window in the housing of the
hydraulic spring operating mechanism. The position of a white adhesive strip attached to one
of the springs shows to what extent the hydraulic spring operating mechanism is charged.

5.4. Oil gauge glass

Fig. 39: Inspection window for the filling level of hydraulic oil of the operating mechanism (example)

1 Filling level of hydraulic oil 2 Hydraulic oil

The oil filling level can be observed in a gauge-glass, visible through an inspection window in
the housing of the hydraulic spring operating mechanism. If the hydraulic oil is visible in the oil
gauge glass with a fully tensioned disc spring assembly, there is enough hydraulic oil available
to perform the switching operations.

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 73 / 140
5. Indicating elements

5.5. Position indicator for the circuit-breaker

1 2

O
O

Fig. 40: Position indicator of the operating mechanism in its two switching positions (example)

1 Position indicator for the circuit-breaker in 2 Position indicator for the circuit-breaker in open
closed position position

The hydro-mechanical spring operating mechanism has an indicator which shows the switch
ing position of the circuit-breaker. The circuit-breaker can be either in the CLOSE or OPEN po
sition.
Position indicators show the contact position of a switching element. The contact position of
the connected switching element is displayed as follows, if not otherwise specified concerning
position designation and color.
Indicator Status Circuit-breaker switching status
I ON CLOSE
O OFF OPEN

74 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 5. Indicating elements

5.6. Position indicator for the disconnector-earthing switch

1
1

Fig. 41: Location of position indicator in a standard GIS bay (example)

1 Position indicator for disconnector-earthing

switch (example)

2 3

O
O

Fig. 42: Position indicator of the operating mechanism in its two switching positions (example)

1 Position indicator for disconnector (optional) 2 Position indicator for the switching element in
closed position
3 Position indicator for the switching element in 4 Position indicator for earthing switch
open position

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 75 / 140
5. Indicating elements

The operating mechanism for disconnector and earthing switches has an indicator which
shows the switching position. The switching element can be either in the CLOSE or OPEN po
sition.
Position indicators show the contact position of a switching element. The contact position of
the connected switching element is displayed as follows, if not otherwise specified concerning
position designation and color.
Indicator Status Switching status
I ON CLOSE
O OFF OPEN

76 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 5. Indicating elements

5.7. Position indicator for fast-acting earthing switch

Fig. 43: Location of position indicator in a standard GIS bay (example)

1 Position indicator for fast-acting earthing switch

(example)

O
3 O

Fig. 44: Position indicator for switching elements (example)

1 Position indicator 2 Position indicator in CLOSE position (example)

3 Position indicator in OPEN position (example)

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 77 / 140
5. Indicating elements

78 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

6. Operation
This section gives an overview according to the operational modes and describes the proce
dures for manual handling of disconnectors and earthing switches. It is addressed to the plant
office, operating company and certified technicians.
Correct execution of work is the responsibility of the plant officer, operating company. The
plant officer and operating company assigns the personnel according to the operating modes.

6.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.

Hazardous voltages
DANGER
In case of internal failures in conjunction with failure of the protection system hazardous voltag
es are present at all components of the installed product. Electric flashover, transient overvolt
age, excessive temperatures, and toxic SF6 decomposition products might lead to fatal injuries.

4 Operation, maintenance and repair must be carried out by trained and certified personnel
only.

Opening bursting disk

DANGER
Any switching operation of a switching element with insufficient gas density may cause a flash
over and the bursting disk in a pressure relief device to open. Extremely hot gas under high
pressure is then suddenly released and might lead to fatal injuries.

4 Keep away from the exhaust of the pressure relief device.

4 Only operate switching elements if the gas density is in operating range.

4 Before carrying out repair work, execute the required safety steps.

6.2. Operation modes

The following operating modes must be considered:
̶ REMOTE from the plant main control desk
̶ LOCAL from the local control cubicle

6.2.1. REMOTE operating mode

Minimum qualification for assigned personnel operating in REMOTE operating mode is Rou
tine Operation/Maintenance Technician (Target groups [} 10]).
In REMOTE position all switching operations are controlled from the main control desk. Event
and alarm signals are relayed to the main control desk via the control cubicle.
Detailed description of operation in the REMOTE operating mode is not part of this document.
The information is provided by the plant officer and operating company.

6.2.2. LOCAL operating mode

Minimum qualification for assigned personnel operating in LOCAL operating mode is Routine
Operation/Maintenance Technician (Target groups [} 10]).

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 79 / 140
6. Operation

In LOCAL position the control from the main desk is disabled. In LOCAL position the connect
ed switching elements such as the circuit-breaker can be switched via pushbuttons on the local
control cubicle.
Detailed description of operation in the LOCAL operating mode is not part of this document.
The information is provided by the plant officer and operating company and in the document of
the local control cubicle (Project specific documents [} 12]).

6.3. Motor operation of the switching elements

Settings for motor operation:
̶ Contact position of the connected switching element: CLOSE or OPEN
̶ Mode selector secured by padlock in motor operation position.
During motor operation the mode selector is in the motor operation mode. The connected
switching element can be controlled REMOTE from the substation main control desk or LO
CAL from the local control cubicle. During motor operation it is not possible to change settings
of the mode selector of the drive.

6.4. Manual operation of the circuit-breaker operating

mechanism
It is possible to trigger the circuit-breaker by hand via the hand plungers of the pilot valves of
the operating mechanism. A manual triggering serves only to check the reliability performance
in case of servicing or maintenance work at a dead circuit only, and does not represent any
normal operational case.
Description of the manual operation is not part of this document, it is described in the docu
ment for the operating mechanism (Project specific documents [} 12]).

6.5. Manual operation of the disconnector-earthing switch

6.5.1. Accessing the operating panel

Use of hand crank
WARNING
Interlocking is inactive with override switch in ON position. Manual operation of switches that
are connected to high voltage may cause severe damage of the switchgear.

4 Prior to manual operation of a switch secure against reclosing.

4 Isolate the manually operated switching device from high voltage and secure against re
connecting.

4 Check the position indicators and viewports and verify that the interlocking conditions are
fulfilled and the switch is not connected to high voltage.

4 Move the switch always to its final position.

80 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

1 1 1 2 3

1 5 1 1 4 6 7 8

Fig. 45: Operating panel; cover closed (left), cover open (right)

1 Screw fixing the cover 2 Position indicator

3 Disconnector-earthing switch drive 4 Cover
5 Padlock locking the cover 6 Padlockable hinge locking the mode selector
for earthing switch
7 Padlockable hinge locking the mode selector 8 Operating panel for manual operation
for disconnector swich

Prerequisites
ü Manual operation of the drive must only be performed for maintenance or repair purposes.
ü Permit to work granted by the plant officer and operating company.
ü Prevention of motorized operation
ü Operating elements: Mode selection lever, padlock and key for padlock, hand crank
ü Optional: At the local control cubicle key switch for operating mode switched from RE
MOTE to LOCAL control.

Procedure

1. Open the padlock locking the cover (5) with the key and remove the padlock. Keep for later
reuse.

2. Loosen the screws (1) and remove the cover (4). Keep for later reuse. The Cover is loss-
secure fixed to the housing.
ð The motor supply circuit of the drive is disabled. A signal is released indicating that the
cover has been removed. The access to the hand crank insertion hole is blocked.
Manual operation is not possible, since the mode selection lever is locked by the
hinge in the position for electrical control.

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6. Operation

6.5.2. Changing to manual operation mode of the

disconnector

1 2 3

Fig. 46: Settings on the operating panel for hand crank operation of the disconnector

1 Padlockable hinge locking the mode selector 2 Mode selection lever set to manual operation
for earthing switch mode of the disconnector
3 Padlockable hinge released for setting the
mode selector to manual operation mode of the
disconnector

Procedure

1. Remove the padlock and swivel the lever (3) in the open position.

2. Turn mode selector (2) counter-clockwise to the manual operation mode of the disconnec
tor.
ð Motor operation is disabled.
ð In the manual position the drive can only be operated by hand crank.

3. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

82 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

6.5.3. Opening the disconnector

Fig. 47: Settings on the operating panel for hand crank operation of the disconnector

1 Mode selection lever in manual operation mode 2 Hand crank

of the disconnector
3 Hand crank opening

Prerequisites
ü Changing to manual operation mode of the disconnector [} 82]
ü Hand crank

Procedure

1. Insert the hand crank (2) into the hand crank opening (3).

2. Turn the hand crank clockwise to the OPEN position of the disconnector.
Torque 15 Nm
Approx. 24 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for disconnector and earthing
switches (Viewing port for the switching position [} 71]).

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

5. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

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6. Operation

6.5.4. Closing the disconnector

Fig. 48: Settings on the operating panel for hand crank operation of the disconnector

1 Mode selection lever in manual operation mode 2 Hand crank

of the disconnector
3 Hand crank opening

Prerequisites
ü Changing to manual operation mode of the disconnector [} 82]
ü Hand crank

Procedure

1. Insert the hand crank (2) into the hand crank opening (3).

2. Turn the hand crank counter-clockwise to the CLOSE position of the disconnector.
Torque 15 Nm
Approx. 24 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for disconnector and earthing
switches (Viewing port for the switching position [} 71]).

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

5. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

84 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

6.5.5. Changing to blocking mode

1 2 3

Fig. 49: Settings on the operating panel for blocking mode

1 Padlockable hinge locking the mode selector at 2 Mode selector in blocking mode
blocking position
3 Padlockable hinge locking the mode selection 4 Blocking pin
lever for disconnector

The blocking pin (4) avoids a direct selection of manual operation of the earthing switch.

Procedure

1. Remove the padlock and swivel the hinge (1) in the open position.

2. Turn mode selector counter-clockwise to the blocking mode (2).

ð In the blocking position no switching operation can be done. The disconnector and
earthing switch are blocked at the present position. The operating mechanism is me
chanically blocked against motor and manual operation.

3. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 85 / 140
6. Operation

4. Option: Closing the operating panel for maintenance [} 86].

6.5.6. Closing the operating panel for maintenance

1 1 1 2 3

1 5 1 1 4 6 7

Fig. 50: Settings of the operating panel during maintenance; cover closed (left), cover open (right)

1 Screw fixing the cover 2 Position indicator

3 Disconnector-earthing switch drive 4 Cover
5 Padlock locking the cover 6 Padlockable hinge locking the mode selection
lever
7 Padlockable hinge locking the mode selection
lever

Prerequisites
ü Manual operation of the drive must only be performed for maintenance or repair purposes.
ü Permit to work granted by the plant officer and operating company.
ü At the local control cubicle: key switch for operating mode switched from REMOTE to LO
CAL control.
ü At the local control cubicle: key switch for INTERLOCKING OVERRIDE switched to ON
position.
ü Prevention of motorized operation
ü Operating elements: Mode selection lever, padlock and key for padlock, hand crank

86 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

Procedure

1. Open the padlocks locking the mode selection lever (6, 7) with the key and remove the pad
locks. Keep for later reuse.

2. Put the cover (4) back on the housing and fix the screws (1). The Cover is loss-secure fixed
to the housing.

3. Close the padlock locking the cover (5) with the key. Keep for later reuse.

6.5.7. Changing to manual operation mode of the earthing

switch

1 2 3

Fig. 51: Settings on the operating panel for hand crank operation of the earthing switch

1 Padlockable hinge locking the mode selection 2 Mode selection lever in manual operation mode
lever in locked position of the earthing switch
3 Padlockable hinge locking the mode selector 4 Blocking pin
for disconnector swich

It is not possible to directly work the manual operation mode of the earthing switch without hav
ing worked the disconnector mode. The clockwise rotation of the mode selector towards the
manual operation position of the earthing switch is blocked by a pin (4).

Procedure

1. Remove the padlock and swivel the hinge (1) in the open position.

2. Turn mode selector counter-clockwise to the manual operation mode of the earthing switch
(2).
ð Motor operation is disabled.
ð In the manual position the drive can only be operated by hand crank.

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6. Operation

3. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

6.5.8. Opening the earthing switch

4 2

Fig. 52: Settings on the operating panel for hand crank operation of the earthing switch

1 Mode selection lever in manual operation mode 2 Hand crank

of the earthing switch
3 Hand crank opening 4 Padlockable hinge

Prerequisites
ü Opening the disconnector [} 83]
ü Changing to manual operation mode of the earthing switch [} 87]
ü Hand crank

Procedure

1. Insert the hand crank (2) into the hand crank opening (3).

2. Turn the hand crank counter-clockwise to the OPEN position of the earthing switch.
Torque 15 Nm
Approx. 24 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for disconnector and earthing
switches (Viewing port for the switching position [} 71]).

88 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

5. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

6.5.9. Closing the earthing switch

4 2

Fig. 53: Settings on the operating panel for hand crank operation of the earthing switch

1 Mode selection lever in manual operation mode 2 Hand crank

of the earthing switch
3 Hand crank opening 4 Padlockable hinge

Prerequisites
ü Changing to manual operation mode of the earthing switch [} 87]
ü Hand crank

Procedure

1. Insert the hand crank (2) into the hand crank opening (3).

2. Turn the hand crank clockwise to the CLOSE position of the earthing switch.
Torque 15 Nm
Approx. 24 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for disconnector and earthing
switches (Viewing port for the switching position [} 71]).

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

5. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

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6. Operation

6.5.10. Changing to motor operation mode

1 2 3

Fig. 54: Settings on the operating panel for automatic operation of the disconnector-earthing switch

1 Padlockable hinge locking the mode selection 2 Mode selection lever in motor operation mode
lever in locked position
3 Padlockable hinge locking the mode selection
lever for disconnector

Procedure

1. Turn mode selector clockwise to the motor operation mode (2).

ð In the position for motor operation all switching operations are electrically controlled
from the local control cubicle or the main control desk (standard position).

2. Option: Swivel the hinge backwards and attach padlock.

ð The mode selector is blocked.

90 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

3. Closing the operating panel [} 91]

6.5.11. Closing the operating panel

1 1 1 2 3

1 5 1 1 4

Fig. 55: Settings of the operating panel for motor operation; cover closed

1 Screw fixing the cover 2 Position indicator

3 Disconnector-earthing switch drive 4 Cover
5 Padlock locking the cover

Prerequisites
ü The cover (4) can be re-attached at any position of the mode selector in order to freeze
the actual position.
Preferably, the mode selector is set to blocking mode (Changing to blocking mode [} 85])
or motor operation mode (Changing to motor operation mode [} 90])

ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 91 / 140
6. Operation

Procedure

1. Put the cover (4) back on the housing and fix the screws (1). The Cover is loss-secure fixed
to the housing.

2. Close the padlock locking the cover (5) with the key. Keep for later reuse.

3. Optional: At the local control cubicle key switch for operating mode switched from LOCAL
to REMOTE control.

4. Clear the permit to work (Permit to work system [} 64]).

5. Return the hand crank and the key for the padlock to the plant officer / operating company.

6.6. Manual operation of the fast-acting earthing switch

6.6.1. Accessing the operating panel

Use of hand crank
WARNING
Interlocking is inactive with override switch in ON position. Manual operation of switches that
are connected to high voltage may cause severe damage of the switchgear.

4 Prior to manual operation of a switch secure against reclosing.

4 Isolate the manually operated switching device from high voltage and secure against re
connecting.

4 Check the position indicators and viewports and verify that the interlocking conditions are
fulfilled and the switch is not connected to high voltage.

4 Move the switch always to its final position.

92 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

1 2

48

Fig. 56: Operating panel; cover closed

1 Fast-acting earthing switch drive 2 Cover

3 Operating panel for manual operation 4 Padlock locking the cover
5 Position indicator

Prerequisites
ü Manual operation of the drive must only be performed for maintenance or repair purposes.
ü Permit to work granted by the plant officer and operating company.
ü Prevention of motorized operation
ü Operating elements: Mode selection lever, padlock and key for padlock, hand crank
ü Optional: At the local control cubicle key switch for operating mode switched from RE
MOTE to LOCAL control.

Procedure

1. Open the padlock locking the cover (4) with the key and remove the padlock. Keep for later
reuse.

2. Loosen the screws and remove the cover (2). Keep for later reuse. The cover is loss-secure
fixed to the housing.
ð The motor supply circuit of the drive is disabled. A signal is released indicating that the
cover has been removed. The access to the hand crank insertion hole is blocked.
Manual operation is not possible, since the mode selection lever is locked by the
hinge in the position for electrical control.

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6. Operation

6.6.2. Changing to manual operation mode of the fast-acting

earthing switch

1 2
3

4
90°

48

Fig. 57: Settings on the operating panel for hand crank operation of the fast-acting earthing switch

1 Mode selector opening 2 Selector motor operation mode position

3 Hand crank 4 Selector manual operation mode position of the
fast-acting earthing switch

Procedure

1. Insert the hand crank (3) into the mode selector opening (1).

2. Turn mode selector clockwise to the manual operation mode position (4) of the fast-acting
earthing switch.
ð Motor operation (2) is disabled.
ð Access to the hand crank insertion hole is unblocked.
ð In the manual position the drive can only be operated by hand crank.

94 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

6.6.3. Opening the fast-acting earthing switch

48

3 2

Fig. 58: Opening the fast-acting earthing switch

1 Hand crank 2 Fast-acting earthing switch opening

3 Hand crank opening

Prerequisites
ü Changing to manual operation mode of the fast-acting earthing switch [} 94]
ü Hand crank (1).

Procedure

1. Insert the hand crank into the hand crank opening (3).

2. Turn the hand crank counter-clockwise to the OPEN position of the fast-acting earthing
switch (2).
Torque 15 Nm
Approx. 48 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for fast-acting earthing switches
(Viewing port for the switching position [} 71]).

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6. Operation

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

6.6.4. Closing the fast-acting earthing switch

48

3 2

Fig. 59: Closing the fast-acting earthing switch

1 Hand crank 2 Closing mode position of the fast-acting earth

ing switch
3 Hand crank opening

Prerequisites
ü Changing to manual operation mode of the fast-acting earthing switch [} 94]
ü Hand crank (1)

Procedure

1. Insert the hand crank into the hand crank opening (3).

2. Turn the hand crank clockwise to the CLOSE position of the fast-acting earthing switch (2).
Torque 15 Nm
Approx. 48 turns
ð The position indicator changes its status. In order to visually check the actual position
of each switching element, viewing ports are provided for fast-acting earthing switches
(Viewing port for the switching position [} 71]).

3. Turn the hand crank back by half a rotation to release tension from gear.

4. Remove the hand crank. Keep for later reuse.

96 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

6.6.5. Changing to blocking mode

1
2

4 M

3 90°

48

Fig. 60: Settings on the operating panel for blocking mode

1 Mode selector opening 2 Hand crank

3 Manual operating mode position 4 Blocking mode position

The blocking pin (4) avoids a direct selection of manual operation of the earthing switch.

Procedure

1. Insert the hand crank (2) into the mode selector opening (1).

2. Turn mode selector clockwise to the blocking mode (4).

ð In the blocking position no switching operation can be done. The fast-acting earthing
switch is blocked at the present position. The drive is mechanically blocked against
motor and manual operation (3).

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6. Operation

3. Option: Closing the operating panel for maintenance [} 98].

6.6.6. Closing the operating panel for maintenance

1 2

4 3

Fig. 61: Closing the operating panel for maintenance; cover closed (left), maintenance cover (right)

1 Fast-acting earthing switch drive 2 Maintenance cover

3 Screw fixing the cover 4 Padlockable hinge locking the cover
5 Padlock

Prerequisites
ü Manual operation of the drive must only be performed for maintenance or repair purposes.
ü Permit to work granted by the plant officer and operating company.
ü At the local control cubicle: key switch for operating mode switched from REMOTE to LO
CAL control.
ü At the local control cubicle: key switch for INTERLOCKING OVERRIDE switched to ON
position.
ü Prevention of motorized operation
ü Operating elements: Mode selection lever, padlock and key for padlock, hand crank

98 / 140 ELK-3 420 kV | ABB Operating Instructions (1HC0038807 E01 eng AK)
 6. Operation

Procedure

1. Put the maintenance cover (2) back on the housing and fix the screws (3). The cover is
loss-secure fixed to the housing.

2. Close the padlock (5) locking the maintenance cover with the key. Keep for later reuse.

6.6.7. Changing to motor operation mode

1 2
3

5 M
4
180°

48
3

90°

Fig. 62: Settings on the operating panel for motor operating mode position of the fast-acting operating switch

1 Mode selector opening 2 Selector motor operation mode position

3 Hand crank 4 Selector manual operation mode position of the
fast-acting earthing switch
5 Blocking mode position

Procedure

1. Insert the hand crank (3) into the mode selector opening (1).

2. Turn mode selector counter-clockwise to the motor operation mode (2).

ð In the position for motor operation all switching operations are electrically controlled
from the local control cubicle or the main control desk (standard position).

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6. Operation

3. Closing the operating panel [} 100]

6.6.8. Closing the operating panel

11 22

33
44

Fig. 63: Fast-acting earthing switch drive; cover closed

1 Fast-acting earthing switch drive 2 Cover

3 Screw fixing the cover 4 Padlock locking the cover

Prerequisites
ü The cover (2) can be re-attached at any position of the mode selector in order to freeze
the actual position.
Preferably, the mode selector is set to blocking mode (Changing to blocking mode [} 97])
or motor operation mode (Changing to motor operation mode [} 99])

Procedure

1. Put the cover back on the housing and fix the screws (3). The cover is loss-secure fixed to
the housing.

2. Close the padlock locking the cover (4) with the key. Keep for later reuse.

3. Optional: At the local control cubicle key switch for operating mode switched from LOCAL
to REMOTE control.

4. Clear the permit to work (Permit to work system [} 64]).

5. Return the hand crank and the key for the padlock to the plant officer / operating company.

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 7. Maintenance

7. Maintenance
This section is addressed to the plant officer and operating company and certified technicians.
The section gives an overview of the maintenance concept and the maintenance work re
quired. A maintenance plan is provided which enables the planning of tasks to be carried out to
retain the product in its functional state.
The appropriate planning of maintenance is the responsibility of the plant officer and operating
company.

7.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.
We recommend to follow the given maintenance intervals to prevent a wear out failure which
can lead to a critical fault.

7.2. Maintenance plan

Maintenance is intended to retain the product in its safe and functional condition and reduce
the risk of unexpected down times of the switchgear within the substation.
The maintenance plan covers:
̶ scheduled maintenance based on
time intervals (Scheduled maintenance based on time intervals [} 102])
lifetime criteria for components (Scheduled maintenance according to mechanical criteria
[} 111])
̶ unscheduled maintenance due to
alarm signals (Status and alarm signals [} 101])
malfunction or damage (Unpredictable events [} 102])
Maintenance is intended to:
̶ ensure a qualified service for the product against predictable and unpredictable events for
product lifetime
̶ ensure the knowledge to service the product for product lifetime
̶ maximize the time the product is in operation
̶ keep the costs for maintenance predictable

7.2.1. Unscheduled maintenance

7.2.1.1. Status and alarm signals

Hazardous operating conditions

DANGER
Safety relevant status and alarm signals are delivered by the monitoring systems for gas den
sity and status of the operating mechanisms for the switching elements of the switchgear sys
tem. Operating the product under hazardous operating conditions can lead to malfunction of
the system.

4 Strictly avoid hazardous operating conditions.

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7. Maintenance

Hazardous operating conditions Consequences

Gas density below the minimum functional density: An interrupting chamber can explode if currents are
switched off beyond. Operations with insufficient gas
density damage the mechanics of the circuit-breaker
even if no currents are switched.
Spring travel of the disc springs of the hydro-mechani The circuit-breaker will not switch reliably.
cal spring operating mechanism below the thresholds
for closing and opening operations:
If the product is operated in combination with the con Switching is blocked at hazardous operating conditions.
trol cubicle of ABB: The corresponding failure is indicated on a signal board
at the control cubicle
Tab. 18: Hazardous operating conditions

Status signal Consequences

GREEN Gas density in operating range
GREEN/YELLOW Gas density in operating range - low density
RED Gas density in blocking range.
Tab. 19: Status signals for evaluation

Evaluating systems for status signals are not part of the product. The availability of such sys
tems depends on the project specific configuration. The complete set of status signals is avail
able only in combination with a control cubicle of ABB.

7.2.1.2. Unpredictable events

̶ Mechanical damage of components
̶ Breaking of a bursting disk in a pressure relief device
̶ Sudden gas leakage
̶ Failure of switching operations due to
̶ Problems with the operating linkage
̶ Operating mechanism does not react to control signals
̶ Loss of oil of the operating mechanism
̶ Loss of earthing connections

7.2.2. Scheduled maintenance based on time intervals

The intervals are given as maxima. The actual intervals have to be defined by the plant officer
and operating company.
Every Part of installation Activity
5 years GIS plant Visually check all parts [} 104]
5 years Rating plates (especially with out Check visually all rating plates
door installations) [} 104]
5 years Static elements of GIS plant (espe Check static elements [} 104]
cially with outdoor installations)
5 years Flanges (especially with outdoor in Treat outdoor flanges with silicon
stallations) grease [} 104]
5 years Gas compartments Check gas density and gas pressure
[} 104]
5 years Gas compartments Measure the dew point [} 105]
5 years Gas compartments Measure the gas percentage [} 106]
5 years Density monitors Test the density monitor [} 106]
5 years Control cubicle Check anti-condensation heaters in
local control cubicle [} 107]

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 7. Maintenance

Every Part of installation Activity

5 years Operating mechanism, operating Check anti-condensation heaters in
mechanism housing operating mechanism and operating
mechanism housing [} 107]
5 years Crcuit-breaker, fast-acting earthing Check end position of switching ele
switch, maintenance earthing switch, ments [} 108]
disconnector
5 years Crcuit-breaker, fast-acting earthing Carry out a switching operation
switch, maintenance earthing switch, [} 109]
disconnector
Occasionally Operating mechanism Control the oil level according to the
operating instructions of the hydro-
mechanical spring operating mecha
nism (Project specific documents
[} 12]).
Occasionally Operating mechanism Analyse the pump counter state ac
cording o the operating instructions
of the hydro-mechanical spring oper
ating mechanism (Project specific
documents [} 12]).
5 years (2.5 years for outdoor condi Operating mechanism Visually check the operating mecha
tions) nism (corrosion, loose parts or wir
ing).
5 years (2.5 years for outdoor condi Operating mechanism Check the length of the carbon
tions) brushes according to the operating
instructions of the hydro-mechanical
spring operating mechanism (Project
specific documents [} 12]).
Occasionally Pressure relief device (especially Check pressure relief device for
with outdoor installations) damage [} 109]
Occasionally Voltage transformer, current trans Check connections and fixing
former, surge arrester screws periodically for loosening. If
necessary retighten according to
ABB instructions.
Tab. 20: Maintenance table

See also
2 Check visually all parts [} 104]
2 Check visually all rating plates [} 104]
2 Check static elements [} 104]
2 Treat outdoor flanges with silicon grease [} 104]
2 Check gas density and gas pressure [} 104]
2 Measure the dew point [} 105]
2 Measure the gas percentage [} 106]
2 Test the density monitor [} 106]
2 Check anti-condensation heaters in local control cubicle [} 107]
2 Check anti-condensation heaters in operating mechanism and operating mechanism hous
ing [} 107]
2 Check pressure relief device for damage [} 109]
2 Carry out a switching operation [} 109]
2 Check end position of switching elements [} 108]
2 Project specific documents [} 12]

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7. Maintenance

7.2.2.1. Check visually all parts

Procedure

1. Check all parts for damage.

2. In case of any problems, please contact ABB (Customer support [} 9]).

7.2.2.2. Check visually all rating plates

Procedure

1. Check rating plates (especially with outdoor installations) for legibility.

2. Clean or replace if necessary.

3. In case of any problems, please contact ABB (Customer support [} 9]).

7.2.2.3. Check static elements

Procedure

1. Check static elements for corrosion. Any beginning corrosion and damaged paintwork must
be repaired.

2. Check screws at connections and retighten if necessary.

3. In case of any problems, please contact ABB (Customer support [} 9]).

7.2.2.4. Treat outdoor flanges with silicon grease

As a protection against corrosion, all flange joints and other sealing positions to the gas com
partment can be greased through lubricating nipples.

Prerequisites
ü grease gun

Procedure

1. Treat all flanges with the appropriate grease according to ABB instructions.

2. Inject grease with the grease gun under an increased pressure of 70-75 bar into the gaps of
the specified interfaces/lubrication nipple until it emerges at the loosened screw/flange.

3. Remove superfluous grease.

4. In case of any problems, please contact ABB (Customer support [} 9]).

7.2.2.5. Check gas density and gas pressure

Wrong pressure measuring

DANGER
Gas pressure varies by temperature, gas density does not. If the ambient temperature for the
measurement is not taken into consideration, this might lead to a wrong filling pressure. Any
switching operation with insufficient gas density may cause breaking of a bursting disk in a
pressure relief device. Breaking of a bursting disk releases hot gas which may cause burns,
releases decomposition products of gas which have toxic and corrosive properties.

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 7. Maintenance

4 Always take into consideration the ambient temperature (shade) for the measurement ac
cording to the table for temperature correction.

4 Only operate the switchgear installation if the gas density indicated at the density monitors
is in the operating range.

Prerequisites
ü Gas handling instructions
ü Analog or digital pressure gauge
ü Table for temperature correction (Nominal filling pressure - temperature overview [} 114])

Procedure

1. Prepare the pressure gauge according to the manufactures operating instructions.

2. Connect the pressure gauge to the gas compartment.

3. Check the gas density and gas pressure.

4. Compare the measured values according to the table for temperature correction.

5. If any deviations occur or values are exceeded, please contact ABB (Customer support
[} 9]).

6. If necessary replenish gas according to ABB instructions.

7.2.2.6. Measure the dew point

Incorrect measurement
NOTICE
Humidity present in insulation materials diffuses only very slowly and is absorbed by the gas.
Measurements taken too early after filling to nominal filling pressure might result in incorrect
humidity values.

4 Take the measurement at least 2-3 weeks after the gas filling to nominal filling pressure.

Prerequisites
ü Gas handling instructions
ü Dew point measurement instrument with gas pump back into the measured gas compart
ment (no gas is released into the atmosphere while measurements are taken).
ü Gas filling to nominal filling pressure 2-3 weeks before this measurement.

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7. Maintenance

Procedure

1. Prepare the measurement instrument.

2. Connect the instrument to the gas compartment.

3. Carry out measurement according to the operating instructions of the measurement instru
ment supplier.

4. Some instruments available measure the dew point/freezing point of the gas in °C. Howev
er, the limit values for the switchgear are defined in moisture values such as ppmw. Con
vert the measured values in °C to ppmw (Conversion of dew point into humidity [} 115]).

5. Compare recorded value with limit values. limit values for circuit-breaker and voltage trans
former compartments: < 50 ppmw limit values for all gas compartments: < 90 ppmw

6. If the moisture content is above the defined limit values the gas must be dried via drying
filters, either installed in the reclaimer or using additional external drying filters, and meas
ured again after 2-3 weeks.

7.2.2.7. Measure the gas percentage

Gaseous decomposition products

NOTICE
A reduced percentage of pure SF6 gas inside a gas compartment can lead to a diminished dia
lectrical withstand capability and creates gaseous decomposition products between SF6 and
nitrogen (N2) or oxygen (O2).

4 Keep the percentage of pure SF6 gas among other gases inside a gas compartment higher
than 97%.

Prerequisites
ü SF6 gas handling instructions
ü SF6 gas percentage measurement instrument with gas pump back into the measured gas
compartment (no SF6 gas is released into the atmosphere while measurements are taken)

Procedure

1. Prepare the measurement instrument.

2. Connect the instrument to the gas compartment.

3. Carry out measurement according to the operating instructions of the measurement instru
ment supplier. The percentage of pure SF6 gas among other gases inside a gas compart
ment must be higher than 97%.

4. If the SF6 gas percentage is lower than 97% the SF6 gas has to be reclaimed and replaced
by new SF6 gas according to ABB instructions.

5. Please contact ABB (Customer support [} 9]).

7.2.2.8. Test the density monitor

Prerequisites
ü Density monitor test device
ü Test gas: dry air, nitrogen or air from a pump or compressor. SF6 must not be used as test
gas!

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 7. Maintenance

Procedure

1. Demount the density monitor.

2. Expose the density monitor during 4 to 5 hours to constant environmental conditions.

3. Mount the density monitor to the gas connection.

4. Connect the terminal of the density monitor to the control box.

5. Let the test gas flow into the buffer volume of the test device until the manometer shows a
value of approximately 100 kPa above the trigger value.

6. Let the test gas flow out of the buffer volume until a pressure of ~20 kPa above the nominal
value of the micro switch is reached.

7. Read the temperature from the thermometer. The temperature should be as near as possi
ble to the temperature of the test gas.

8. Look-up the switching value and note it in the protocol (Nominal value of the gas density
sensor [} 116]).

9. Let the test gas flow out of the buffer volume in a speed that every 1 kPa can be read at the
manometer.

10.The activation of the diode shows the closing of the corresponding micro-switch. Note the
pressure at the switch point.

11.Further lower the pressure until all the micro switches are switched.

12.If the switches show a deviation of more than 10 kPa from the nominal value, the complete
density monitor needs to be sent back to the supplier.

13.Please contact ABB (Customer support [} 9]).

7.2.2.9. Check anti-condensation heaters in local control cubicle

The local control cubicle is equipped with anti-condensation heaters to prevent humidity and to
allow all components to function properly.

Prerequisites
ü Operating instructions of the local control cubicle

Procedure

1. Press the test lamps on the dedicated local control cubicle panel. The heater test lamps in
dicate the healthy condition of the heaters when pressing the heater test push button.

2. For detailed instructions see the operating instructions of the local control cubicle.

7.2.2.10. Check anti-condensation heaters in operating mechanism and operating

mechanism housing
The operating mechanism and operating mechanism housings are equipped with anti-conden
sation heaters to prevent humidity and to allow all components to function properly.

Prerequisites
ü Operating instructions of the hydro-mechanical spring operating mechanism (Project spe
cific documents [} 12])
ü Operating instructions of the local control cubicle (Project specific documents [} 12])

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7. Maintenance

Procedure

1. Make sure that the power supply is turned on.

2. Check if the heater is warm.

3. If the heater does not function, the heating plate might be defective and has to be replaced.

4. Please contact ABB (Customer support [} 9]).

7.2.2.11. Check end position of switching elements

Arc appearance during visual inspection

WARNING
Switching operations may produce arcs. During visual inspection of the position of a switching
element the switching element could be operated and thus produce an arc. Looking into an arc
can permanently impair the eyes and the ability to see!

4 Arc appearance symbols are placed on viewing ports of the Gas Insulated Switchgear. Do
not look through a viewing port when the switching element is operated!

2 3 4

Fig. 64: Checking the end position of switching elements (example)

1 Viewing port 2 Moveable contact in CLOSED position

3 Moveable contact in undefinied position 4 Moveable contact in OPEN position

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 7. Maintenance

Procedure

1. Check end positions through the provided viewing ports. The moveable contact of the
switching element has to be either in CLOSED or OPEN position. Any undefined position
can seriously damage the product and has to be strictly avoided!

2. In case of any problems, please contact ABB (Customer support [} 9]).

7.2.2.12. Carry out a switching operation

Procedure
4 To test the drive function carry out a switching operation.

7.2.2.13. Check pressure relief device for damage

Opening bursting disk

DANGER
Any switching operation of a switching element with insufficient gas density may cause a flash
over and the bursting disk in a pressure relief device to open. Extremely hot gas under high
pressure is then suddenly released and might lead to fatal injuries.

4 Keep away from the exhaust of the pressure relief device.

4 Only operate switching elements if the gas density is in operating range.

4 Before carrying out repair work, execute the required safety steps.

The protective cover and cover plate secures the pressure relief device against accidental me
chanical damage from outside and from weather in the case of outdoor installations.

Fig. 65: Pressure relief device (example)

1 Cover 2 Pressure relief device

3 Bursting disk (inside)

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7. Maintenance

Procedure

1. Keep a safety distance of at least 5 meters from each pressure relief device during opera
tion.

2. Check cover of pressure relief device for damage. In case of damage the whole pressure
relief device has to be replaced.

3. Please contact ABB (Customer support [} 9]).

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 7. Maintenance

7.2.3. Scheduled maintenance according to mechanical

criteria
Terminals at the local control cubicle are provided to forward signals of switching operations of
all switching devices to external operation counters.
Switching device No. of operations
Circuit-breaker 10000 CO
Disconnector 5000 CO
Maintenance earthing switch 10000 CO
Fast-acting earthing switch 1000 / 2000 (drive) CO
Tab. 21: Scheduled maintenance according to mechanical criteria

Prerequisites
ü It is the responsibility of the plant officer and operating company to count close-open oper
ations of the switching devices. Automated recording is possible by connecting the status
signals of the corresponding operating mechanisms to counters.

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7. Maintenance

Procedure

1. Check close-open operations of the switching devices.

2. When the recorded number of mechanical operations reaches the admissible maximum
number of switching operations the maximum lifetime of the switching device has been
reached.

3. Please contact ABB (Customer support [} 9]).

7.2.4. Scheduled maintenance according to the breaking

capability of the circuit-breaker

Fig. 66: Quantity of admissible breaking operations

The diagram refers to three-phase breaking operations. For single-phase breaking operations,
the value can be estimated to be 50% of the three-phase value.

Prerequisites
ü It is the responsibility of the plant officer and operating company to record the switched
current for each breaking operation of the circuit-breaker.

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 7. Maintenance

Procedure

1. Check the recorded current for each breaking operation of the circuit-breaker.

2. Calculate the reached percentage of the admissible breaking operations according to the
following formula: Sum of (Switched current kA)2 < 20 x (63 kA)2

3. When the percentage of the admissible number of breaking operations reaches 80%, it is
time to plan the next inspection.

4. Please contact ABB (Customer support [} 9]).

Example
30 x (0.4 kA)2 = 4.8
40 x (10 kA)2 = 4000
1 x (63 kA)2 = 3969
Sum = 7973.8
100/79’380*7973.8 = 10%
The circuit-breaker has reached approximately 10% of the admissible breaking operations.

7.3. Technical data

7.3.1. Pressure of gas-insulated switchgear

Data Value Unit
Minimal pressure - circuit-breaker 600 kPa abs 20°C
Minimal pressure - switching mod 450 kPa abs 20°C
ules
Minimal pressure - passive modules 450 kPa abs 20°C
(indoor)
Minimal pressure - passive modules 450 kPa abs 20°C
(outdoor)
Rated filling pressure - circuit-break 680 kPa abs 20°C
er
Rated filling pressure - switching 580 kPa abs 20°C
modules
Rated filling pressure - passive mod 530 kPa abs 20°C
ules (indoor)
Rated filling pressure - passive mod 530 kPa abs 20°C
ules (outdoor)
Tab. 22: Pressure in the gas-insulated switchgear

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7. Maintenance

7.3.2. Nominal filling pressure - temperature overview

Temperature in Nominal filling pressures in kPa abs at 20° C
°C
-20 632 572 556 533 510 479 440 400 384 352 128
-18 640 578 563 539 516 484 444 404 388 355 129
-16 647 585 569 545 521 489 449 408 392 359 130
-14 655 591 575 551 527 494 453 412 395 362 131
-12 662 598 582 557 533 500 458 416 399 365 133
-10 670 605 588 563 538 505 463 420 403 369 134
-8 678 611 594 569 544 510 467 424 407 372 135
-6 685 618 601 575 549 515 472 428 411 376 136
-4 693 624 607 581 555 520 476 432 415 379 137
-2 700 631 613 587 560 525 481 436 419 383 138
0 707 637 619 593 566 530 485 440 422 386 139
+2 715 643 625 598 571 535 490 444 426 390 140
+4 722 650 632 604 577 540 494 448 430 393 141
+6 729 656 638 610 582 545 499 452 434 396 142
+8 737 662 644 616 588 550 503 456 438 400 144
+10 744 669 650 622 593 555 508 460 441 403 145
+12 751 675 656 627 599 560 512 464 445 407 146
+14 758 681 662 633 604 565 517 468 449 410 147
+16 766 688 668 639 609 570 521 472 453 413 148
+18 773 694 674 644 615 575 526 476 456 417 149
+20 780 700 680 650 620 580 530 480 460 420 150
+22 787 706 686 656 625 585 534 484 464 423 151
+24 794 712 692 661 631 590 539 488 467 427 152
+26 801 719 698 667 636 595 543 492 471 430 153
+28 808 725 704 672 641 600 548 496 475 433 154
+30 815 731 710 678 647 604 552 499 479 437 155
+32 822 737 716 684 652 609 556 503 482 440 156
+34 829 743 722 689 657 614 561 507 486 443 158
+36 836 749 727 695 662 619 565 511 490 447 159
+38 843 755 733 700 667 624 569 515 493 450 160
+40 850 761 739 706 673 629 574 519 497 453 161
+42 857 767 745 711 678 633 578 523 501 456 162
+44 864 773 751 717 683 638 582 526 504 460 163
+46 871 779 757 722 688 643 586 530 508 463 164
+48 878 785 762 728 693 648 591 534 511 466 165
+50 885 791 768 733 699 652 595 538 515 470 166
Tab. 23: Nominal filling pressure in kPa abs at 20° C

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 7. Maintenance

7.3.3. Conversion of dew point into humidity

SF6 gas dew point in °C / moisture values in ppmW
Dew point Moisture Dew point Moisture Dew point Moisture
°C ppmw °C ppmw °C ppmw

-60 1 -32 38 -4 539

-59 2 -31 42 -3 587
-58 2 -30 47 -2 638
-57 2 -29 52 -1 694
-56 2 -28 57 0 754
-55 3 -27 64 1 810
-54 3 -26 70 2 871
-53 3 -25 78 3 935
-52 4 -24 86 4 1003
-51 4 -23 95 5 1076
-50 5 -22 105 6 1153
-49 5 -21 115 7 1235
-48 6 -20 127 8 1322
-47 7 -19 140 9 1415
-46 8 -18 154 10 1513
-45 9 -17 169 11 1618
-44 10 -16 186 12 1728
-43 11 -15 204 13 1845
-42 13 -14 223 14 1969
-41 14 -13 245 15 2101
-40 16 -12 268 16 2240
-39 18 -11 293 17 2387
-38 20 -10 320 18 2542
-37 22 -9 350 19 2706
-36 25 -8 382 20 2880
-35 27 -7 417
-34 31 -6 454
-33 34 -5 495
Tab. 24: Conversion of dew point into humidity

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7. Maintenance

7.3.4. Moisture, percentage and decomposition products –

limit values
Limits values
Measurements
Gas compartment with nominal filling pres Gas compartment to nominal filling
sure pressure
680, 700 and 780 kPa abs 420, 460, 480, 530, 620 kPa abs

Percentage of SF6 > 97 % > 97 %

Decomposition products < 250 ppmv < 25 ppmv
(SO2 + SOF2) Exception:Voltage transformer:
< 25 ppmv
Values for moisture in < 50 ppmw < 90 ppmw
operation

conversion: ppmv : ppmw = 8.1:1

7.3.5. Nominal value of the gas density sensor

Fig. 67: Nominal value of the gas density sensor

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 7. Maintenance

7.3.6. Tightening torques

The tightening torques consider the bolt material of quality 8.8, A4-70 and A2-70, thread size
and material of the nut thread.
Thread size Nut thread in aluminum Nut thread in steel Unit
M4 2 3 Nm
M5 4 6 Nm
M6 5.5 10 Nm
M8 13 22 Nm
M 10 24 42 Nm
M 12 42 70 Nm
M 16 90 160 Nm
M 20 160 300 Nm
M 24 230 420 Nm
Tab. 25: Standard tightening torques

Special tightening torques must be considered for support- and partition insulator, transport
cover, equipment on enclosures and pressurized bolts according to ASTM-standards. Contact
ABB for further information.

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7. Maintenance

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 8. Packaging

8. Packaging
This section is addressed to the plant officer and operating company.
It describes ABB’s packing of the product, its assemblies, spare parts, and or operating ma
terials and provides information on maintaining the proper condition of the product in a
packed condition and professional packing procedures.
Original packing of the product is in the responsibility of ABB. Re-packaging for storage or
transport is in the responsibility of the plant officer and operating company.

8.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.

8.2. Purpose and selection of the packaging

ABB’s packaging meets modern cargo handling standards.
The expected mechanical stress and environmental demands during storage and transport
require packaging which provides sufficient protection to maintain the usability of the prod
uct.
̶ The packaging must provide sufficient protection against mechanical stress and damage
caused by: stacking pressure, acceleration, impact, vibration
̶ The packaging must provide sufficient protection against corrosion resulting from the ef
fects of the weather such as: air humidity, extreme temperatures, high salinity of the air,
sand storms
̶ The packaging must provide sufficient protection against environmental impacts such as:
industrial gases, precipitation containing pollutants
̶ Corrosion protection is applied according to valid standards. The type of corrosion protec
tion depends on the mode of transport and the required protection period.

8.3. General requirements

If the product was already in operation

̶ Ensure that decommissioning was professionally performed. Decommissioning must be
performed by ABB.
̶ Ensure that gas filling is reduced to transport pressure.

Securing and padding

̶ Only non-hygroscopic materials such as plastic scraps, polyurethane chips or polystyrene
beads are used as filling and stuffing materials; wood shavings or similar are not suitable!
̶ Contact surfaces between wood and bright metal are isolated with chemically neutral
films to prevent the corrosive effect of wood acids on the metal.
̶ The packed goods are padded with foam rubber or rubber buffers.

Boxes and crates

̶ The floors are constructed to permit any water entering the crates to drain away.

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8. Packaging

̶ The openings are dimensioned in a way that they do not close over when the wood swells
up.
̶ A water barrier is fitted to the lids to prevent the formation of water pockets.
̶ The moisture content of the planks and wood must not exceed 18 %.
̶ The boxes and crates are suitable for the intended purpose and sufficiently stable. They
comply with the required load capacities.

8.4. Hazardous goods

Procedure

1. Any goods classed as hazardous are packed in accordance with the international hazard
ous goods regulations and loaded separately if necessary.

2. Prescribed packaging and containers are used.

3. The crates are marked with the necessary labels for identification of hazardous goods.

4. Hazardous goods certificates are enclosed with the consignments.

8.5. Corrosion protection up to 12 months

For corrosion protection up to 12 months the VCI (volatile corrosion inhibitor) method is
used.

Prerequisites
ü There must be no cross-ventilation.
ü It is not necessary to seal the product airtight.

Procedure
4 Cover the packed good fully with a polyethylene VCI-foil.

8.6. Corrosion protection up to 24 months

For corrosion protection up to 24 months the VCI (volatile corrosion inhibitor) method is
used.

Prerequisites
ü There must be no cross-ventilation.
ü It is not necessary to seal the product airtight.

Procedure

1. Protect all hermetically sealed hollows with VCI-foam.

2. Cover the packed good fully with a polyethylene VCI-foil.

8.7. Corrosion protection exceeding 24 months

For corrosion protection exceeding 24 months the desiccant method is used.

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 8. Packaging

Procedure

1. Fully seal the packed good with a polyethylene VCI-foil with an aluminium-vapour-barrier.

2. Place a desiccant within each enclosure.

3. Fit a moisture indicator with a window to monitor the relative air humidity inside the pack
aging. The measuring scale must range from 30 to 50 % or 30 to 80% relative air humidi
ty. A viewing port, covered by a hinged cover, must be provided at the position of the indi
cator.

8.8. Marking the packaging

ABB’s packaging provides the following information.

Prerequisites
ü The identification marks comply with internationally valid regulations, lettering written in
upper case characters.
ü As a minimum the crate must have the following shipping marks: crate number, order
number, complete address of the recipient, complete address of the sender, gross
weight, and dimensions.

Procedure

1. Attach the packing list to the outside of the crate.

2. Attach cautionary and handling instructions, highlighted with suitable symbols.

3. Provide crate with attachment points.

4. Mark heavy crates and crates with an off-center of gravity or top heaviness with a correct
ly positioned center of gravity symbol and an additional labeling “CENTRE OF GRAVI
TY”.

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8. Packaging

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 9. Storage

9. Storage
This section is addressed to the plant officer and operating company. It describes the necessa
ry steps for storing the product, its assemblies, spare parts, and operating materials over a
specific period of time. Inspection of received goods, warehouse organization and warehouse
management are the responsibility of the plant officer and operating company and therefore
not dealt with in this document.
The correct execution of the work is the responsibility of the plant officer and operating compa
ny.

9.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.

9.2. Storage classification

Storage conditions are classified in order to protect the product from being damaged.

A B C

F
D
E

Fig. 68: Storage classification

A Air−conditioned storage building B Storage building

C Shelter roof D Tarpaulin
E Unprotected outdoor storage F Container

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9. Storage

9.3. General requirements on types of storage

Environmental condition A B C D E F
If not stated otherwise, product remains in original pack ● ● ● ● ● ●
ing
Covered by shelter roof, protection against rain and snow ● ● ● ●
Fully enclosed ● ●
With temperature control according to the required stor ● ●
age temperature
Storage in refrigerated room ●
With temperature control to prevent condensation ● ●
Protection against rats, insects etc. ● ● ●
With ventilation ●
With tarpaulin at minimum 400 mm above the product, ●
sloped for water shedding
With possibility for ventilation (open containers) ●
Good drainage required ● ●
Containers respectively products to be stored at mini ● ●
mum 200 mm above the floor
No standing water on the product ●
Tab. 26: General requirements on types of storage

9.4. Storage requirements for parts and material

Parts Material, Finish General instruc Storage classifi Inspections dur Checks before
tions cation ing storage use
Gas-insulated Store in the origi F, C Contact ABB for
switchgear bays nal packing. Instructions of in
and subassem stallation and
If storage period
blies commissioning.
is longer than 1
month, connect
the heating in the
drive mecha
nisms.
Control cabinets Electrical equip Store in the origi B Measure humidity Touch up any
ment nal packing. every 6 months. damages to the
paint finish.
If storage period If relative humidi
is longer than 1 ty ex ceeds 60 %,
month, connect renew drying
the heating in the agent.
control cabinets.
Bushings Porcelain, Silicon Do not bend dur B Check every 12 Clean the surfa
ing storage. months whether ces with Rivolta
all parts are dry; if MTX forte.
Bushings with
not, refer to
sealing rings −
"Checks before
refer to rubber
use" .
parts below.
Make sure that
Refer to the in
the parts are not
structions on the
subject to stress
packing.
of any kind.

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 9. Storage

Parts Material, Finish General instruc­ Storage classifi­ Inspections dur­ Checks before
tions cation ing storage use
Flat gaskets, o- Rubber Store in the origi B Check elapsed If necessary,
rings, o-seals, nal packing. storage time. clean with soap
sealing rings and water or a
Protect from com Check surfaces
solution of 1.5 %
pression, tension for scoring or
soda in water.
and twisting. scratches.
Rinse with clear
Protect from di Check the condi
water after clean
rect sunlight and tion of the vulcan
ing. NOTICE! En
artificial light with ized joints.
sure that the wa
a high ultra violet
ter temperature is
contents.
equal to the am
Do not store to bient tempera
gether with cop ture.
per, manganese
metals or plastic
foils.
Steel sections Hot dipped Material must be E Check tarpaulins Remove the
galvanized stored on beams for damages and white rust preven
raised at mini replace, if neces tive coating.
mum 30 cm sary.
above the floor.
Remove any rus
ty binding wires.
Bolts, Nuts Stainless steel Store in the origi B
nal wooden and
cardboard boxes.
Silver plated alu Galvanic and B Check elapsed Remove the
minum and cop special pro ces storage time. transport packing.
per ses
Randomly check Degrease the sil
silver plated sur ver plated surfa
faces. ces with Rivolta
MTX forte. Fully
Check cycle: ev
remove all re
ery 6 months in
maining spots
the first year, ev
and marks.
ery 12 months
thereafter. Grease the con
tact surfaces with
Check 6 months
acid free petro
prior to use.
leum jelly (Vase
line) and protect
them with crepe
paper.
Castings, sheet Aluminum D Check for water Follow the manu
metal, sections penetration after facturer's instruc
and tubes made heavy rain fall. tion.
from aluminum
Check tarpaulins
for damages and
replace, if neces
sary.
Paints, lacquers, Do not store next A Randomly check
thinners, harden to any heat six months prior
ers source. to use.
Tab. 27: Storage requirements for parts and material

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9. Storage

9.5. Protection recommendations against environmental

conditions
Environmental condition A B C D E F
Pressure from stacking and/or excessive firmness of the ● ● ● ● ● ●
packing material
Mechanical damage ● ● ● ● ● ●
Rain and snow ● ● ● ●
Salty air ● ● ● ●
Extreme temperatures (beyond the permissible range) ● ● ●
Detrimental humidity ● ● ●
Temperatures supporting condensation ● ●
Dust pollution ● ●
Temperatures below −5 °C ●
Tab. 28: Protection recommendations against environmental conditions

9.6. Product storage example

Environmental condition A B C D E F
Instruments (electrical and electronic) or similarly sensi ●
tive products
Paints ●
Robust switchgear ●
Less sensitive material ●
Aluminum parts ●
General outdoor material ●
Hot dipped galvanized material ●
Epoxy cast resin ●
Tab. 29: Protection recommendations against environmental conditions

9.7. Storage
Moist desiccant
NOTICE
The storage period of the desiccant is max. 24 months! The desiccant might get moist and pro
motes corrosion of the product.

4 Observe storage period.

4 If the storage period is expected to exceed 24 months, a moisture indicator with window
must be provided in the packaging for monitoring purposes.

4 If the air humidity exceeds 50% the desiccant must be replaced.

Prerequisites
ü Storage is the responsibility of the plant officer and operating company.
ü The ambient conditions during storage must be taken into account (Project specific docu
ments [} 12]).
ü The stored goods must be adequately packed (Packaging [} 119]).
ü The safety and handling information attached to the packaging must be observed (Mark
ing the packaging [} 121]).

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 9. Storage

ü The storage period is limited according to the type of corrosion protection (Packaging
[} 119]).
ü The instructions of the supplier of hazardous goods must be observed.
ü The storage space must be arranged to accommodate the size of the packed product, its
elements and spare parts. Each individual stored element must be freely accessible for in
spection purposes. Take the following factors into account: size, weight, required ground
bearing capacity, distance to neighboring devices.
ü Physical conditions for storage must be observed (Project specific documents [} 12]).
ü The stored goods are marked during packaging (Marking the packaging [} 121]).

Procedure
4 Choice of the storage method must be based on the purpose of storage. The product, its
elements and spare parts must be packed for their protection (Packaging [} 119]).

9.8. Maintenance during storage

Damaged packaging
NOTICE
Damaged packing results in a reduced protection against corrosion, environmental impacts,
mechanical stress, and damage.

4 Check the packaging condition regularly.

Procedure

1. Inspect at least annually the condition of the packaging and corrosion protection of the stor
ed goods.

2. If necessary replace the damaged packaging elements.

3. During storage periods of more than 24 months, check the moisture indicator regularly.

4. If the air humidity exceeds 50% the desiccant must be replaced.

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9. Storage

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 10. Transport

10. Transport
This section is addressed to the plant officer and operating company.
It describes the necessary steps for transporting the product. Depending on the destination the
shipping mode is selected either by road, rail, sea or air. Correct execution of the original
transport is in the responsibility of ABB. Transport after decommissioning is the responsibility
of the plant officer / operating company.

10.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.
During transport of heavy loads situations can occur which endanger personnel, goods and
equipment.

Falling loads
WARNING
If suspended or elevated loads fall down, fatal injury and damage to equipment can occur.

4 Use the personal protective equipment.

4 Cordon off hazardous areas.

4 Keep the working area free.

4 Persons must not stand below suspended or elevated loads.

4 Ensure that loads are correctly secured.

4 Only use faultless hoisting gear and auxiliary material which have sufficient bearing ca
pacities and which are approved for the loads.

4 Only lift the product by the attachment points provided.

4 Ensure that the hoisting gear and cranes are used correctly.

4 Transport the product horizontally.

Transport on rollers or wheels

WARNING
If loads get out of control, fatal injury and damage to equipment can occur.

4 Use the personal protective equipment.

4 Only use faultless hoisting gear and auxiliary material which have sufficient bearing ca
pacities and which are approved for the loads.

4 Move loads slowly and carefully.

4 Avoid slipping or shifting of the loads.

10.2. Loading and lifting facilities

Loading and lifting facilities to prevent equipment and parts from being damaged during load
ing and lifting operations, the facilities shall be suitable for this purpose in terms of intended
applications and load-carrying capacities.
When moving or lifting packed equipment, make sure that no other than the fixing and hitching
points marked on the packaging are used.

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10. Transport

Switchgear bays and components that are not packed may be lifted at suitable hitching points,
provided that every precaution has been taken to prevent these parts from being damaged in
the process.
The shipping units’ center of gravity markings shall be taken into account to prevent the units
from tipping over.

10.3. Means of transportation

The means of transportation is selected so as to ensure that the shipping units will be subject
ed to the smallest possible amount of vibration. NOTICE! Any damage to the equipment must
be prevented by all means.

10.4. Forces and stresses during transportation

FL
FQ

FV

Fig. 69: Forces and stresses during transportation

The admissible forces on gas-insulated switchgear equipment are specified hereafter. During
loading and lifting operations higher values may occur.
Mode of transportation FL FV FQ Unit
Railway 4.0 0.5 0.4 g (acceleration due to
gravity)
Road 1.0 2.0 0.6 g
Ship 0.4 2.0 0.8 g
Aircraft 4.0 0.5 0.4 g
Tab. 30: Admissable forces and stresses during transportation

10.5. Transport with packaging

Prerequisites
ü The goods to be transported must be adequately packed.
ü The transport conditions must be taken into account.
ü Personnel executing the work must be trained in using hoisting gear.
ü Personnel executing the work must be trained in using transport equipment such as crane,
forklift truck, transport rollers, trolley.

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 10. Transport

Procedure

1. Only use hoisting gear with a sufficient bearing capacity.

2. Observe the permissible weight of the load and the safety instructions for the means of
transport.

3. Observe the transport marks. The transport crate is marked with internationally valid sym
bols (Marking the packaging [} 121]).

4. Loading with a crane: Attach the transport crate at the points provided. Lift the transport
crate horizontally.

5. Loading with a forklift truck: Lift the transport crate from below.

6. Secure the transport crate on the means of transport on all sides with a tensioning force
which is suitable for the overall weight of the product.

10.6. Transport without packaging

Maximum loading capacity
WARNING
The supporting steel structure can break into the loading surface of the transport vehicle.

4 If the product is loaded without a transport crate, the loading area must be suitable for car
rying the corresponding weight at the contact points of the transport supports.

4 To determine the localized weights see net weight indication on product’s rating plate or
see packing list.

Prerequisites
ü The goods to be transported must be adequately packed.
ü The transport conditions must be taken into account.
ü Personnel executing the work must be trained in using hoisting gear.
ü Personnel executing the work must be trained in using transport equipment such as crane,
forklift truck, transport rollers, trolley.

Procedure

1. If the product was already in operation, ensure that decommissioning was professionally
performed. Decommissioning must be performed by ABB.

2. Ensure that gas filling is reduced to transport pressure (Checking received goods).

3. For the means of transport observe the bearing capacity of the hoisting gear, the cargo
weight, and the localized weights at the contact points of the transport supports.

4. Lift the product and deposit it onto the loading area.

5. Ensure that the product remains secured to the lifting equipment and the crane until the
product is secured on the loading area.

6. Secure the product on the means of transport on all sides with a tensioning force which is
suitable for the overall weight of the product.

7. Slacken the weight on the crane and remove the lifting equipment.

8. Protect the transported goods against effects of weather and pollution with a tarpaulin.

9. Unload the goods in reverse sequence.

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10. Transport

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 11. Disposal

11. Disposal
This section is addressed to the plant officer and operating company. Correct execution of
work is the responsibility of the plant officer and operating company.

11.1. Safety instructions

Observe the general safety instructions. Legislative regulations, international standards, and
the guidelines of the plant officer and operating company regarding work safety and accident
prevention also apply.

11.2. Recycling and disposal

̶ Ensure that decommissioning of the product was professionally performed. Decommission
ing must be performed by ABB.
̶ The assemblies are disassembled by authorized personnel only according to ABB proce
dure and safety regulations.
̶ The equipment must always be collected separately or in material groups in accordance
with the classification of the equipment.
̶ For the disposal of material not mentioned in this document, contact ABB.
̶ Follow the local standards, rules and regulations for waste and disposal.

11.2.1. Oil
Several oil types can be recycled.
Take into account for differentiation purposes:

Prerequisites
ü ABB's information
ü duration of use
ü conditions under which the oil was used

Procedure
4 Collect and return recyclable oils to the supplier or a qualified dealer for processing.

11.2.2. Used oil

Procedure
4 Collect and return to the supplier or a qualified dealer for disposal.

11.2.3. Used SF6 gas

Pollution of water, air, and soil
NOTICE
SF6 gas has a severe greenhouse effect.

4 Observe all environmental protection legislation.

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11. Disposal

4 Comply with all laws and directives for correct handling of the equipment and material
groups.

4 Comply with the instructions of the supplier.

Procedure

1. Observe the safety instructions when handling SF6 gas.

2. Return used SF6 gas to the supplier or a qualified dealer for processing.

11.2.4. Decomposition products of SF6 gas

Handling decomposition products of the SF6 gas
WARNING
Electric arcs in SF6 atmosphere produce decomposition products. The decomposition products
form corrosive acids when they come into contact with water or air humidity.

4 Handle and neutralize decomposition products according to the SF6 gas handling guide of
ABB.

Procedure

1. Observe the safety instructions when handling SF6 gas.

2. Return the decomposition products and acids immediately to a qualified dealer for disposal.

11.2.5. Untreated paper

Procedure
4 Return non-coated paper, printed or plain, in bundles to an appropriate recycling plant.

11.2.6. Soiled paper

Procedure
4 Paper soiled with oil or other contaminants and coated paper must be disposed of in a fur
nace equipped with a filter.

11.2.7. Clean cardboard

Procedure
4 Return non-coated cardboard, also corrugated cardboard, printed or plain, to an appropri
ate recycling plant.

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 11. Disposal

11.2.8. Soiled cardboard

Procedure
4 Cardboard soiled with oil or other contaminants and coated cardboard must be disposed
of in a furnace equipped with a filter.

11.2.9. Untreated wood

Procedure
4 Dispose untreated wood at a shredding plant.

11.2.10. Treated wood

Procedure
4 Treated wood must be disposed of in a furnace equipped with a filter.

11.2.11. Plastic

Procedure

1. Plastic must be returned to an appropriate recycling plant.

2. Adhesive tape can be disposed of with normal waste.

11.2.12. Polystyrene
Packaging sections and polystyrene chips with the designation polystyrene and the code PS or
076. To further identify polystyrene: it breaks with a dry cracking sound when bent.

Procedure
4 Polystyrene must be returned to an appropriate recycling plant.

11.3. Disposal depots and authorities

Return to ABB
Materials can only be returned to ABB in special cases when this has been expressly agreed
upon.

Notification of authorities
The legislation and directives of the plant officer and operating company apply.

Notification of ABB
Notify ABB for statistical purposes.

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11. Disposal

ABB Switzerland Ltd

High Voltage Products
Brown Boveri Strasse 5
CH-8050 Zurich / Switzerland

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ABB Operating Instructions (1HC0038807 E01 eng AK) | ELK-3 420 kV 139 / 140
Contact us

© Copyright ABB 2015 1HC0038807 E01 eng AK

ABB Switzerland Ltd
High Voltage Products
Brown Boveri Strasse 5
CH-8050 Zurich / Switzerland
Phone: +41 58 588 31 86
Fax: +41 58 588 17 22

www.abb.com/highvoltage