GAS INSULATED SWITCHGEAR

MODEL

HS-X (TYPE1)
12kV/24kV

Advanced environmentally
friendly switchgear
 Advanced environmentally friendly s
Mitsubishi Electric Corporation has designed and manufactured a substantial amount of
high quality switchgear all over the world. This vast experience was drawn on to produce
the next generation of advanced environmentally friendly switchgear, the ”HS-X”.

F lexible design - Suitable for many applications

Designed so that several orientations of cable terminations
(power and control) entry are available, makes it one of the
most flexible switchgear on the market.

S imple installation - Quick and easy

No gas processing is required during site installation and
commissioning, which simplifies planning and reduces time
required for installation, and maintains the high quality of
the switchgear during transportation.

U ser friendly - Simple operation

A simple layout of the operating mechanisms and mimic
diagram at the front of the panel leads to straightforward
operation. Additionally this reduces the chance of mal-
operation.

C ompact size - Space saving

The weight and required space for installation has been
reduced †1 by the use of solid insulated busbars and the
application of a multi-function relay.
†1 46% less space compared to Mitsubishi Electric existing GIS of the same ratings

E nergy saving - Reduction of running costs

The use of an electro-magnetic VCB operating mech-
anism reduces the required operation energy by
approximately 80% when compared to conventional
motor-spring operating mechanisms.

01 MITSUBISHI HS-X
y switchgear

H igh reliability - Years of trouble free operation

The reliability has been increased even further by the application of an
electro-magnetic vacuum circuit breaker (VCB) operating mechanism. With
fewer parts†2 the chances of failures occurring have decreased.
†2 35% less parts than conventional Mitsubishi Electric spring VCB operating mechanism.

S afe Design - Ensures operator’s safety

In the event of an internal arc, any arc fault gas will be directed
away from the operator (through the top of the panel). With the
benefit of GIS design concepts, there are no live parts exposed
inside the panel which ensures utmost safety for operators.

L ow maintenance - Reduction of maintenance costs

The circuit breaker’s advanced electro-magnetic operation does
not require maintenance for over 15 years†3. The circuit breaker
and disconnecting / earthing switch are hermetically sealed in a
tank and together with the application of original anti-oxidation
grease to the moving parts of the disconnecting / earthing switch
enable smooth long-term operation for 15 years or more.
†3 Under normal operation conditions according to IEC standard.

C O NT E NT S

RATINGS 03

FEATURES 04

COMPONENTS 05

SAFE OPERATION & USER FRIENDLY 07

HIGH RELIABILITY AND COMPACT SIZE 09

SWITCHGEAR ARRANGEMENT 11

FOUNDATION DRAWING 13

E
STANDARD & OPTIONAL SPECIFICATIONS 13
-
nvironmentally friendly - SF6 Free STANDARD ACCESSORIES 14
y
l Mitsubishi Electric Co. is the world leader in establishing compressed
dry air insulation technology based on the design and development OPTION 14
technologies of conventional SF6 switchgear. Under dry, clean and
compression, air has good insulation properties, which makes it
ideally suitable to be used as insulation for gas insulated switchgear.
(Dry air insulation is an option)
MITSUBISHI HS-X 02
 RATINGS

GENERAL
Standard IEC 62271-200†1
Rated voltage kV 12 24
Rated frequency Hz 50 / 60
Rated normal current of main busbars A 630 / 1250
Rated insulation levels LIWV kV (peak) 75 125
AC (1min) kV (rms) 28 50
Rated short-time withstand current kA 25
Rated duration of short-time current sec 3
Insulation medium SF6 / Dry air†2
Rated gas pressure †1 MPa-abs SF6 : 0.13 SF6 : 0.13
Dry air : 0.17 Dry air : 0.17
Alarm gas pressure †1 MPa-abs SF6 : 0.12 SF6 : 0.12
Dry air : 0.15 Dry air : 0.15
†1 : The application standard is for 630A rating with dry air only. Others are IEC 60298.
†2 : Insulation medium of dry air is an option and for 630A rating only.

VACUUM CIRCUIT BREAKER (VCB)

Standard IEC 622271-100
Rated voltage kV 12 24
Type of circuit breaker Vacuum
Rated short-circuit breaking current kA 25
Rated short-circuit making current kA 63
Break time cycles 3
Rated operating sequence O-1min-CO-3min-CO, O-0.3sec-CO-3min-CO, CO-15sec-CO
Type of operating mechanism Electro-magnetic

DISCONNECTING/EARTHING SWITCH (DS/ES)

Standard IEC 60129
Rated normal current (disconnecting switch) A 630 / 1250
Rated short-time withstand current kA 25
Operating mechanism (disconnecting switch) Manual †3
Operating mechanism (earthing switch) Manual
†3 : Motor operation is an option.

WIDE RANGE CURRENT TRANSFORMER (CT)

Standard IEC 60044-1
CT ratio †4 A 2000 / 5 or 600 / 5
Burden VA 5
Accuracy class 10P20 / Class 1.0
†4 : Transformer ratio can be adjusted in combination with MP multi-function relay.

EARTHED VOLTAGE TRANSFORMER (EVT)

Standard IEC 60044-2
Rated primary voltage V 11000 22000
Rated secondary voltage V 110
Rated tertiary voltage †5 V 110, 190
Burden (secondary / tertiary) †5 VA 50 / 50
Accuracy class 1.0 / 3P
†5 : Tertiary winding is an option.

LIGHTNING ARRESTOR (LA)

Standard IEC 60099-4
Type Zinc oxide
Rated voltage kV 12 24
Normal discharge current kA 5, 10

03 MITSUBISHI HS-X
FEATURES

Multi-function relay Moduled control circuit Solid insulated busbar

Mitsubishi “MP” relays are installed as Control devices and equipment and The busbar is independently solidly
standard. This relay combines pro- wiring are moduled. Functions are insulated for each phase, which eli-
tection, measurement and control readily interchangeable and the minates any chance of phase-to-phase
functions into one compact flush door enclosure of live parts provides a faults. Also no gas processing is required
mounted unit. Current transformer high level of reliability. during site installation or maintenance.
ratios are adjustable in combination
with the use of wide range current
transformers.

BUS

Test terminal (Option)

There is no need to disturb the cable
terminations in order to carry out high Three position switch
ES DS
voltage testing of cables. (Maximum The earthing switch is unified with
applicable voltage : DC20kV / 10min) the disconnecting switch.

VCB

Three position disconnecting Gas vessel

switch operating mechanism The circuit breaker, disconnecting
The operating mechanism is simple and earthing switch are hermeti-
making it user friendly and reduces cally sealed in the maintenance free
the chances of mal-operation. dry air or SF6 insulated gas vessel.

Electro-magnetic VCB
operating mechanism Plug-in termination (Option) Wide range current transformer
A reduced number of parts increases Reduces the time required for cable The ratios of the current transformers
the reliability of the VCB. Also, a termination work. Also cable volt- can be changed without physically
reduction in the required energy to age withstand testing can be easily changing the CTs in combination with
operate the VCB is achieved. performed by using a test terminal multi-function relay (MP), providing
without removing the cables. great flexibility.

Test terminal

IEEE 386 or DIN 47 636

Cable

MITSUBISHI HS-X 04
 COMPONENTS

Vacuum circuit breaker (VCB)

The VCB’s operating mechanism is an electro-magnetic type. As
the name implies, the electro-magnetic type of VCB is driven by
electro-magnets. The electrical power required is supplied by a
capacitor (see below for auxiliary power requirements).

The electro-magnetic VCB has the following features:

■ Reliability increase
The structure of the electro-magnetic operating mechanism is
more simple than that of the motor-spring operating mechanism,
and required 35% less parts which significantly reduces the
chances of failures.

■ Maintenance reduction
With the use of an electro-magnetic operating mechanism,
there is no need for major maintenance for over 15 years.†1
†1 : The service life of the capacitor should be 15 years under normal operation conditions.

■ Energy required reduction

The required energy is reduced by 80% (when compared to
conventional motor-spring operating mechanisms) by minimizing DC power supply
operation energy loss. Furthermore, noise during VCB operation
has been significantly reduced. “Close” push button
“Open” push button
JP Pat No. 4230246 “Close” charge completion lamp(LED)
Others, five patents in Japan and twenty-three patents in eight “Open” charge completion lamp(LED)
different countries (CN, HK, TW, KR, SG, DE, FR, US). Auxiliary power / control circuit
Electro-magnetic operating mechanism
“Closing” capacitor
“Opening” capacitor
Operation / indication unit
Vaccum circuit breaker (VCB)

Auxiliary power
Equipment Capacity Remarks
VCB Capacitor charging current DC 110V
Electrical-magnet I(A) (Open)I=5A,T=0.02 Sec
operation (Close)I=0.4A,T=3.5 Sec
T(S)

DS Control power DC 110V, 0.5A Other voltages are

(For motor available as an option.
operation)
Motor operation current DC 110V : I1=5A Option
I2(A) I1(A)
I2=1.5A

0.2(ms)

3(s)

05 MITSUBISHI HS-X
Three position switch
An earthing switch is unified with the disconnecting
switch. The earthing switch is manually operated
however the disconnecting switch is manually operated
with motor operation as an option.

Main circuit close position Disconnecting position Earthing position

Main busbar
The main busbar is independently and solidly insulated Earth screen Solidly insulated bus

for each phase. During main busbar connection no gas

Conductor
processing is required. Since the surface of the insulation
is earth screened, there is no chance of phase-to-phase Connection piece
short circuits.
Bushing for bus

Cross section of busbar

Plug in cable termination (Option)

Plug in type cable terminations make cable connection Test
terminal
work simple and efficient. IEEE or DIN standard plug in
type terminations are applicable.

IEEE 386 or DIN 47 636

: Out of scope

Cable

Arc pressure relief device

BUS Relief flap
Pressure relief devices are applicable for safety opera-
tion to prevent human injury in case of internal arc Arc flap

accidents. DS

FRONT
VCB

CABLE

Multi-function relay and wide range current transformer

Flush mounted type multi-function relay “MP” covers protection, control, measurement and communication functions. In
combination with the wide range CT, the CT ratios can be readily changed without the replacement of CTs.

■ Protection ■ Control
Overcurrent (50/51), CB control / Lock out / Remote operation.
Directional ground fault (67G), ■ Measurement
Ground fault (51G), A, V, W, Wh, Var, Varh, Hz, PF
Undervoltage (27), ■ Communication
Overvoltage (59), Modbus®RTU†1, CC-link, CDL protocols are
Ground fault overvoltage (64) available.
†1 : Modbus® is a registered trademark of Schneider Electric SA.

MITSUBISHI HS-X 06
 SAFE OPERATION & USER FRIENDLY

Safe operation
The surface of the solid insulation on the main busbars, voltage transformer, cable termination and gas vessel which is earthed,
prevents electric shocks even when accidental contact occurs while the panel is energized.

Earth shield
(Carbon film) Busbar (Copper)

Insulation material
(Silicon rubber)

0 d

Earth screen busbar

User friendly
The mimic diagram provides easy understanding of the VCB and DS / ES conditions. Mitsubishi HS-X provides easy operation and
prevents mal-operation by having a simple to understand and conveniently located (around eye level) operating mechanisms.

DS/ES shutter operation selector

ES operation mechanism with shutter
DS operation mechanism with shutter
ES condition indicator
VCB manual tripping mechanism with cover
Manual closing button with cover
Capacitor charged lamp
Gas densimeter
DS condition indicator
VCB operation counter
VCB condition indicator
Manual tripping button
Capacitor discharging button

A. Vacuum Circuit breaker

A-1 HS-X adopts an advanced electro-magnetic operation mechanism and
utilizes a capacitor to drive trip and close operation.
For maintenance purposes, the discharging method is simply two steps Capacitor
for close
as described below.

1 ) Turn off the control power (for trip / close).

Capacitor
for trip

2 ) Push the discharging button on the VCB operation mechanism until

the capacitor charged lamp turns off.

07 MITSUBISHI HS-X
A-2 The VCB mechanism provides simple operation from closed to opened condition by the use of a manual trip handle as
described below.

Open the cover Attach the adaptor Apply the handle Pull down the handle

B. Disconnecting / earthing switch

■ A three position switch ensures the DS and ES are not operated at the
same time.

■ By adopting a testing terminal on the ES provides the capability of

performing cable withstand testing without removing the main
power cables. ( Maximum applicable voltage: DC 20V 10min (SF6) )

Test terminal
■ The shutter operation key ensures that the DS / ES are operated
separately and also provides a locking function.

■ The DS / ES can easily operate by using the operation handle

DS / ES operation

C. Installation of busbar & cable termination

■ HS-X switchgear busbar are designed in a individual phase arrange-
ment that prevents faults between phases.

■ Since solid insulation busbars are used, no gas processing is required

during installation and commissioning.

■ Since the cable terminations are standard IEEE / DIN size, installation is
very easy.
Busbar arrangement

MITSUBISHI HS-X 08
 HIGH RELIABILITY AND COMPACT SIZE

Dry air insulation

In response to the increasing concern for the environment,
Mitsubishi Electric Co. has designed the HS-X range of
switchgear using dry air as the insulated medium instead of 24kV 36kV
2
the conventional SF6. As demonstrated by the graph on the
φ200mm
right, under compression, dry air has insulating characteristics Needle
100mm
that are more than sufficient to use as an insulated medium

Breakdown voltage V / Vo (pu)

SF6 Dry-air
for medium voltage gas insulated switchgear. 1.5
N2
JP Pat No. 4545362
Others, two patents in Japan.
1

Global warming potential (GWP) Condition: Lightning impulse voltage 1.2 / 50μs

Insulation medium GWP 0.5

0.0 0.05 0.07 0.1 0.15 0.2
Dry air 0
CO2 1
Pressure (MPa)
SF6 23900

Insulation characteristics of compressed air

(Vo : Breakdown voltage of air at 0.0Mpa)

Compact size
The compact size of the switchgear is achieved by the use of
suitably positioned insulating barriers within the hermetically
HS-X range
sealed vessel. The graph on the right demonstrates that the
breakdown voltage can be increased to more than double (or 2.5
A B
conversely the insulation clearance distance can be decreased
a
Needle
to less than half) of that when no barriers are used. 2 Barrier d
Breakdown voltage V / Vo (pu)

A : φ100mm
B : 300mm×300mm
（t=3mm）
HS-X requires 55% less †1 installation space when compared 1.5 d : 100mm
to its previous model. This allows for it to be installed in
many locations where space is limited.
1
†1 : Based on 10 panel arrangement and maintenance space.
Condition: Lightning impulse voltage 1.2 / 50μs
0.5

JP Pat No. 4146249

Others, one patent in Japan and four patents in four different 0
0 0.2 0.4 0.6 0.8 1
countries (CN, TW, KR, BR).

Barrier position (a/d)

Insulation characteristics of air with insulating barrier

(Vo : Breakdown voltage without barrier)

09 MITSUBISHI HS-X
 700 7000

700
400 6000

50
1650
EXISTING MITSUBISHI
PREVIOUS MITSUBISHI GIS
GIS

1020
HS-X

Space reduction of
55%

1000
MAINTENANCE SPACE †2
1500

MAINTENANCE SPACE †2 including

maintenance space

FRONT

FRONT
Unit : mm
†2 : Maintenance space required is recommendation only.

Mitsubishi long life grease

A specially developed long life grease is applied to the moving Oxidation stability test - Oxidation of grease is the main
parts of the operating mechanism of the Disconnecting / deterioration factor. As the graph above demonstrates
Earthing switch. This “Mitsubishi“ grease has been thoroughly Mitsubishi grease show very little oxidation (the pressure of
tested to guarantee smooth lubrication for over 15 years oxygen remains unchanged throughout the test).
without the need for reapplication, as demonstrated by the
test data results graphed below. The required maintenance IR spectrum of Mitsubishi grease - The IR spectrums of
time required is reduced dramatically. Mitsubishi grease before and after the oxidation stability test
are nearly identical, proving the grease characteristics remain
the same even after many years after it has been put into use.

0.8 100.0
Before oxidation stability test
Mitsubishi grease
80.
Transmittance（%）

0.7 Fluoride-based grease

60.
0.6
After oxidation stability test
Bentonite-based grease 40.
Pressure of oxygen（MPa）

0.5
20.
0.4
0
Lithium soap-based grease 3000 2000 1500 1000 500
0.3 Wave numbers（cm-1）
IR spectrum of Mitsubishi grease
Temperature : 150℃
0.2
Mass of grease : 72g
Lithium soap-based grease
0.1
Coefficient of friction

0.3

0.0 0.2
0 50 100 150 200
Heating time（hr）
0.1
0 10 20 30 Mitsubishi grease

Equivalent period under room temperature (Years)

-20 0 20 80
Oxidation stability test
Temperature（℃）
Coefficient of friction under low and high temperatures

Coefficient of friction - The coefficient of friction of Mitsubishi

grease remains consistently low, both under low and high tem-
perature conditions.

MITSUBISHI HS-X 10
 SWITCHGEAR ARRANGEMENT

Typical single line diagram

TR TR

VD VD
3×LA 3×LA

CT CT

VCB VCB

3×EVT DS / ES DS / ES 3×EVT

ES ES

DS / ES VCB

DS / ES DS / ES DS / ES DS / ES DS / ES DS / ES

VCB VCB VCB VCB VCB VCB

CT CT CT CT CT

Panel layout of above single line diagram

DS / DS / DS / DS / ES DS / ES DS / DS / DS / DS /
ES ES ES ES ES ES ES ES ES
VCB VCB VCB VCB 3×EVT VCB 3×EVT VCB VCB VCB VCB
CT CT CT CT CT CT CT CT
3×LA 3×LA

VD VD

E.BUS

600 600 600 600 600 600 600 600 600 600 600 600 1020

11 MITSUBISHI HS-X
Typical key single line & section view
Incoming panel Outgoing panel Bus section panel Bus EVT / LA panel

DS/ES DS/ES
DS/ES RL

Typical key single VCB VCB

line VCB
CT 3×LA
CT
VD
3×EVT

BUS BUS BUS BUS BUS

ES DS ES DS ES DS RL

Section view VCB VCB VCB

LA

EVT

Width (mm) 600 600 600×2 600

Depth (mm) 1020 1020 1020 1300
12 /
24kV Height (mm) 2000 2000 2000 2000
Weight (kg) 500 500 800 500
Heat value (J/S) 85 85 85 25
■ ♦: Insulator (gas barrier)
Note ■ Heat values indicated are for 630A.
■ For outdoor panels the depth and height are increased by 250mm and 350mm respectively.

Other section view (flexible design)

Cable entry Incoming panel
Incoming panel Incoming panel Bus EVT / LA panel
from top with bus EVT
with EVT / LA from bus duct with ES
(Indoor type only) (Indoor type only)
Bus

3×EVT
DS/ES DS/ES DS/ES
ES
DS/ES
Typical key single VCB
line VCB 3×LA
VCB VCB
3×LA
3×EVT
CT 3×EVT
CT
VD CT
VD

BUS BUS BUS BUS

BUS

ES DS ES DS ES DS ES DS ES

Section view VCB VCB VCB VCB

LA LA

EVT EVT

Width (mm) 600 600 600 †1 600

Depth (mm) 1300 1300 1020 †1 1300
12 /
24kV Height (mm) 2000 2000 2260 2000 2000
Weight (kg) 500 550 550 †1 550
Heat value (J/S) 85 85 85 †1 25
■ ♦: Insulator (gas barrier)
■ Heat values indicated are for 630A.
Note
■ For outdoor panels the depth and height are increased by 250mm and 350mm respectively.
■ Other type configration please contact MITSUBISHI ELECTRIC CO.
†1 : For these specification please contact MITSUBISHI ELECTRIC Co.
MITSUBISHI HS-X 12
 FOUNDATION DRAWING

Front side space for maintenance

1000 1020 †1 (1300) Rear space 50

290 (440) 325 350 (90) Front door Cover

50 (75)
100 (250) 80
100

55 (90)
FRONT
Foundation bolt†2

Floor
400

400

600
FRONT

50 (75)
55 Embedded channel base†2 350

1020
700

Hole for control cable Hole for main circuit cable Foundation bolt hole size 20 Cross-section view
and earthing cable
Side space

†1 : In case of top or rear cable entry, panel depth is requited 1300mm.

( ) means size of outdoor use.
†2 : Embedded channel base and foundation bolt are not supplied.

STANDARD & OPTIONAL SPECIFICATIONS

Item Standard specification Optional specification

Panel Installation location Indoor Outdoor
Panel thickness Enclosure (not including gas vessel) More than 2.0 mm -
Gas vessel Annual gas leakage rate Less than 0.5% weight per year -
Insulation medium SF6 Dry air †1
Low voltage compartment IP2X IP51
Bus bar chamber IP2X IP51
Degree of Gas Vessel IP65 -
protection Operating mechanism compartment IP2X IP51
Cable chamber IP2X IP51
Partitions between compartments IP2X IP4X
All surfaces except operating Munsell 5Y7/1 Specified color
Painting mechanism compartment
Operating mechanism compartment Munsell 5PB3.5/5 Specified color
Type 600V PVC insulated Specified type
General control circuit 1.25 mm2 or more Specified size
Size
VT, CT secondary circuits 2.0 mm2 Specified size
Panel wiring
Color General Yellow Specified color
Color VT and CT secondary circuits Yellow Specified color
Grounding Green Specified color
Main circuit cable entry Front bottom Rear top or bottom
Main circuit cable terminal Not supplied Specified type, size & specification
Cable
Main circuit cable gland Not supplied Specified type, size & specification
Control cable entry Front bottom Front top
Space heater Not supplied Specified type & specification
Auxiliary
Terminal block for control circuits Screw type Specified type
equipment
Name plates Acrylic plate Laminated plates or stainless steel
Multi-function MP + Wide range CT Specified type
relay
DS Operation Manual Motor
Test terminal At ES terminal Not supplied Supplied
†1 : Insulation medium of dry air is for 630A rating only.

13 MITSUBISHI HS-X
STANDARD ACCESSORIES

LV compartment key

Test plug

Shutter operation key

DS / ES operation handle

VCB manual trip handle

Gas adapter

OPTION
CBM (Condition Based Maintenance) System
CBM system is the maintenance system based on the equipment condition. It has two advanced points compared
to Time Based Maintenance system requires periodical maintenance.

1. Prevention of accidents by early detection of

malfunction
2. Reduction of life cycle cost

Example of maintenance Item CBM function unit

Without With
CBM function CBM function
Main periodical inspection item Items automatically
Major Class Part monitored by CBM
inspection
Major Minor Insulation,
Switchgear • Partial discharge monitoring †1
inspection inspection gas pressure †2

Condition Vacuum interrupter • Analysis of driving current

based (contact erosion,degree of vacuum) • Partial discharge monitoring †1
monitoring
(CBM) Electro-magnetic
• Analysis of driving current
operating mechanism
Minor Major VCB
inspection inspection Controller • Charge voltage of capacitor
Control circuit for drive • Analysis of driving current
Minor
inspection Control P.C.B. • CPU fault self-monitoring
Driving capacitor • Time properties of discharging
Visual Visual
inspection inspection †1 : There are cases when partial discharge monitoring cannot be applied, in some cases of
noise level from outside system of panel.
†2 : Gas pressure is monitored with gas densimeter.
Regarding periodical maintenance
For conditions not monitored by the CBM function, periodical inspections equivalent to those conducted
conventionally, including field,minor and major inspections, are required.

JP Pat No. 4682046

Others, two patents in Japan and thirteen patents in seven different countries (CN, HK, TW, KR, US, TH, DE).
MITSUBISHI HS-X 14
 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
www.MitsubishiElectric.com

Revised Publication, effective Jul. 2015.

Superseding Publication, A-199-4-C6718-E of Sep. 2012.
A-199-4-C6718-F HQ1507 Printed in Japan[IP] Specifications are subject to change without notice.