550kVGIS

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Ref. No.GIS550(P1)H1-C

550kV 50/63kA

SF6 GAS INSULATED SWITCHGEAR

EQUIPPED WITH SINGLE BREAK GCB

GISTYPE : IFT

(GCB TYPE:MFPT-500-63L)

TOKYO, JAPAN

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Ref. No. GIS550(P1)H1-C

page 1 of 16 Jointly owned by Hitachi Ltd., Fuji Electric Co., Ltd. and Meidensha Corporation

1.1 Superb Characteristics of GISOver 35 years of successful experiences, GIS have

become the prevailing substation design due to their

superb characteristics raised as follows.

Small Space:550-kV GIS designs take only 4-5% of the spacerequired by conventional open-air type switchyard.

Environmental Adaptability:GIS is suitable for installation almost anywhere, urban

or rural areas, indoor or outdoor,seashore, mountainous

areas, tropical or desert climate conditions.

Ultimate Safety Design:All high-voltage parts are totally encapsulated in thegrounded metal enclosures which secures ultimate

safety to the workers and engineers.

High Reliable and Stable Operation:Since all high voltage parts are sealed inside of inertSF6 gas atmosphere, highly reliable and stable

operation of the substation can be secured, regardless ofclimatic or environmental disturbance of the location.

Earthquake Proof Design:

This feature assures many customers in seismic areasfrom chatastophic damage of the entire switchyard,once a severe earthquake strikes the area.

Extended Maintenance Intervals:

Reliable and stable operation means extended

maintenance intervals.

1.2 Features of JAPAN AE POWER

Gas Insulated Switchgear

1.2.1 Compactness

JAPAN AE POWER offers a choice of standard

isolated-phase GIS. One breaks GCB for 550kV

rating makes significant contribution to this feature

1.2.2 Reliability

JAPAN AE POWER 550kV GIS have proven their

high performance and reliability over more than 27

years and 42 bays in this ratings field operation.

1. DESIGN CONCEPT

This feature includes few gas leakage rate for many

years, but even in the event of a total SF6 gas pressure

loss, JAPAN AE POWER GIS still effectively insulates

the switchgear at nominal system voltage.

1.2.3 Quality

All JAPAN AE POWER GIS are pre-assembled and

tested in the manufacturing plant to secure high quality

level in each product.

1.2.4 Easy Maintenance

Breaker contacts replacement is the most difficult work

in the maintenance program. In JAPAN AE POWER

GIS design, hand holes being provided in the breakertanks give direct access to the breaker contacts. There

is no need to disassemble the circuit breaker out of GIS

assembly, or to employ special tools or a mobile crane

for such purpose.

1.2.5 Environmental Adaptability

JAPAN AE POWER GIS is the most suitable GIS to be

adapted to any particular location because of their

compactness and low profile design.

1.2.6 Significant Savings in Installation Time andCost

JAPAN AE POWER GIS are assembled and tested in

the manufacturing plant and shipped to the site with

fewer disassembly for shipment. This approach

minimizes the number of on-site assembly and

connections, which means significant savings in

installation time and cost.

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2. TYPE & RATING

2.1 Typical 550 kV GIS Construction

A low profile design in which the circuit breakers are located horizontally benefits the customers for easy access to

the breaker, reduced breaker vibration, and safe installation work. This configuration is able to satisfy customerrequirements for any type of external connection without altering the basic GIS bay module.

2.2 Rating (Applicable standard : IEC)

Rated voltage (kV) 550

Type; CB/DS/ES/CT/VT/LA /Main Busbar Isolated-phase type

Rated interrupting current (kA) 50 / 63

Rated lightning impulse withstand voltage (kVp) 1675

Rated power-frequency withstand voltage (kV) 740

Rated normal current (A) 2500 / 3150 / 4000 / 6300Rated short-time current carrying capability (kA) 50 / 63

Rated duration of short circuit current (sec.) 3

CB 0.6Rated pressure ofcompressed SF6gas (MPaG) BUSBAR/DS/ES/CT/VT/LA 0.6

Arrangement

Bay dimensions; Length/Width/Height (approx. m) Approx. L 35 / W 36 / H 10.0

CB Hydraulic

DS Motor

Operating

Mechanism;

ES/HSES Motor / Motor Spring / Manual

CB

CT CT CT CTCT

CB

BUS

CB

BUSDS/ESDS/ESDS/ESDS/ESDS/ES DS/ES

CT

page 2 of 16

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page 3 of 16

A A

DG

B

TR

BB

3. ARRANEGMENT

3.1Typical Arrangement of 550kV GIS (for 1 1/2 CB Connection)

VIEW A-A

GIB

CB

TR

BG

GIB-Bushing Connection

VIEW B-B

BUSDS/ES DS/ES DS/ESDS/ES DS/ES DS/ES

BUS

CT

CB CB

CT CTCTCTCT

CB

BUS

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page 4of 16

3. ARRANEGMENT

3.2Typical Arrangement of 550kV GIS (for Double Bus Connection)

VIEW C-C

DS

CT

A-BUS

B-BUSB-BUS

CB

A

A-BUSA-BUS

CT

B

VT

DS

CT

C

VT

A

B-BUS

A

HSES

B

B

VT

C

C

VTA

B

C

CB

DS

ESES

BG

CTCT

ES

LCP

B-BUS A-BUS

A

B

C

A

B

C

DS DSES

CBLCP

CT

ES

ES

DS DS

HSES

LCP

BG

VT

VT

HSESDSDS

ESES

ES

VIEW A-A

VIEW D-DVIEW B-B

DS

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page 5 of 16

4. MODULAR COMPONENTS

4.1 Gas Circuit Breaker

Spacer

InsulatedNozzle

Moving

Arcing Contact

Stationary

Arcing ContactShield Puffer

Piston

Puffer

Cylinder

Current

Collector

Main

Contact

Conductor Conductor

Insulated

Operating Rod

Construction of Interrupter

(a) Closed Position (b) Open PositionShield

Spacer

Supporting

InsulatorFixing Side

Interrupter

Moving Side

Interrupter

Current

Transformer

Enclosure

Conductor

Conductor

Current

Transformer

Hydraulic Operating Box

Construction of GCB

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4.1.1 High Power Current Interruption

550kV 50/63kA GCB Type MFPT-500-63L, HAR has an interrupter with one break per pole.

This interrupter design has various unique and well-experienced features as shown below.

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(a) SF6 gas is compressed with the motion of the puffer cylinder to the right. (b) Then, it is effectively released

from the insulating nozzle and exhausted from holes on the moving contact simultaneously when the gas pressure

inside the puffer cylinder reaches the level high enough to extinguish the arc and finally the moving contact comes to

the position to have sufficient distance from the stationary contact against lightning and surge voltages.

1) Synchronized Axial Gas Blasting

Puffer Cylinder

CoverPuffer Piston

Contact

Stationary Contact

Main Contact

Nozzle

NO TRANSIENT GAS

PRESSURE DROP

OPTIMUM GAS FLOW

EFFECT

UNIQUE NOZZLE DESIGNSYNCHRONIZED AXIAL

LAVAL NOZZLEGAS BLAST

OPTIMUM AXIAL GAS

FLOW CANAL

OPTIMUM GAS BLAST

TIMING

OPTIMUM PUFFER

VOLUME AND

OPENING SPEED

PUFFER PRESSURE

LOW FIELD STRESS

IMPROVED GAS FLOW

STEP TYPE STATIONARY

CONTACT

HIGH ARC-RESISTANT

NOZZLE MATERIAL

UNIQUE NOZZLE

MATERIAL

Hollow of Moving Contact and

Puffer Cylinder ShaftNozzle

Interruption

Puffer PistonStationary

Contact

InterruptionArc

Moving Contact

Puffer Cylinder

(a) Initial Stage (b) Intermediate Stage

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2) Laval Nozzle

With the Synchronized Axial Gas Blast, gas flow to the hollow of the moving contact is not so strong compared to theflow to the stationary contact.

With the Laval Nozzle, gas flow to the stationary contact is controlled while effective gas flow to the hollow of themoving contact can be secured.

3) Unique Nozzle Design

Through SF6 gas flow analysis in the nozzle, the most optimum nozzle configuration is selected.

(a) Existing Design (b) Advanced Design

SF6 Gas Flow Analysis in the Nozzle

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(a) With the existing design, gas pressure in the gap between the nozzle and stationary contact, where the maximum

dielectric field appears, reaches to high. (b) With the advanced nozzle design, it reaches to the highest.

With single break per pole design, the recovery voltage across the moving and stationary contacts becomes almost

twice compared with double breaks per pole design. High-speed operating mechanism and optimum interrupter

configuration design are the keys to satisfy the primary requirement. Secondary requirement is to keep the samedielectric recovery even after high current interruptions. Deterioration of dielectric recovery characteristic after high

current interruption can drastically be improved by adoption of Teflon with boron-nitride composite.

NOZZLE

1.1 1.3

Nozzle

0.6

Stationary Contact

Nozzle

1.1

1. 0

1.3

Stationary Contact

4) High charging Current Interruption Capability

Dielectric recovery

characteristics

(Advanced Nozzle)

Dielectric recovery

characteristics

(Existing Nozzle)

Applied voltage

Moving

Contact

Stationary

Contact

Nozzle

Voltag

e

(1 Break per pole)

RESTRIKE

Applied voltage

(2 Break per pole)

Metallic Shield

Stroke

Dielectric Recovery Characteristics

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(a) Existing Nozzle (b) Advanced Arc-Resistant Nozzle(Teflon with Boron-nitride)

Nozzle After Certain Full Short Circuit Current Interruptions

5) Step Type Stationary ContactWith the step type stationary contact, the gap between the nozzle and stationary conductor becomes bigger when the

stationary contact gets away from the nozzle resulting in low field stress and improved gas flow.

4.1.2 Hydraulic Operating Mechanism

The hydraulic operating mechanism consists of (1) Oil pump unit for pressure generator, (2) Accumulator containingthe pressurized oil which is discharged to the operating piston cylinder, (3) Operating piston which drives the moving

contact of the breaker and (4) Operating valves which control the oil flow back and forth to the operating piston

cylinder. The operating piston cylinder and associated operating valves are immersed in oil to reduce the number of

oil pipe connections among the related components, resulting in little external oil leakage.

Oil Tank

Solenoid

Pilot Valve

Oil Pump/Motor

Open-Close Indication

Oil Gauge

Heater

Oil Pressure Gauge

Hydraulic Operating Mechanism(for Independent Pole Operation)

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1) GOOD FEATURE

1. Oil immersed type design enables to minimize number of oil pipes reducing significant potential for external oilleakage.

2. Simple, compact and reliable mechanism design provides the following features.a) One oil pump system common to three phases

b) Solenoid driver instead of electro magnetic release hook type driver

c) One side rod type operating piston instead of both side rod type3. Hydraulic Anti-pumping mechanism is provided to ensure safe operation of the breaker.

N2

N2

Change-over ValveOil GaugeHigh-pressurepipingOil Pressure Gau e

Hydraulic Cylinder

Closing choke

Operating Piston

Manihold

Accumulator

Operating Oil

Opening Pilot Valve Anti-pumping piston Closing Pilot valve

Pilot Valve

Air Breather

Oil immersed type Hydraulic

Operating Device

Suction FilterOil Pumpmagnetic separator

In-line Filter

External case

Stop Valve

High pressure Pressure Switch Relief Valve

Low pressure MotorCheck Valve

Construction of Hydraulic Operating MechanismSpecification of Hydraulic Operating Mechanism

Rated Pressure 31.5 MPaG

Operating Duty Cycle O - 0.3 s - C O 3 min. - C O

Accumulator Volume 60 lit. / phase

Oil Pump

Capacity

Charging up time

Replacing Time

1.5kW

Less than 1.5 min. for 1 CO

Less than 10 min. (From 0 to 31.5 MPaG)

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2) Operation

1. Closing OperationOn the picture , when a closing command is given to the closing solenoid, the solenoid operates and opens theclosing pilot valve. The following opens the Amplification Valve, Then, the main control valve control chamber A ishigh pressurized and the main control valve moves downward to the closed position. Since the operating cylinder

chamber B also becomes high pressurized, the operating piston moves to the right for the breaker to close.On the picture , the contact of trip-free contactor, which is energized through the auxiliary switches driven by the

operating piston, interrupt the closing command of control circuit. The closing solenoid is then reset first. The

pilot valve and the Amplification Valveare also reset. The mechanism is in completely closed position (on the

picture ).

2. Opening OperationOn the picture , when an opening command is given to the opening solenoid, the solenoid operates and opens

the opening pilot valve. The following opens the Amplification Valve, Then, high pressurized oil in the Main control

valve control chamber A is released and the Main control valve moves upward to the open position. Since theoperating cylinder chamber B also becomes low pressure, the operating piston moves to open the breaker, the

auxiliary switches driven by the operating piston interrupt the opening command of the control circuit. TheOpening Amplification Valve and the opening pilot valve are reset by their springs. Then, the mechanism is in

completely open position (on the picture ).

Completely Closedposition

Opening Stage

Opening Stage

Closing Stage

Main control valve

control chamber AClosing Stage

O enin Sta e Completely Open Position

Closing Stage

High Pressure

Low Pressure

Oil Pump

AccumulatorOpening Solenoid in operation

OpeningPilotValveopens

Main control valve

moves to open position

Opening

Amplification Valve

opens

The Operating piston

movers to open positionOperating Cylinder chamber C

Operating piston opening

operation is completion

Opening Pilot Valve

Opening Amplification

Valve resets

Closing

Amplification Valve

opensMain control valve

control chamber A

Main control valve

moves to closed position

Closing Solenoid inoperation

Closing Pilot Valve

opens

The Operating pistonmovers to closed position

Operating Cylinder

chamber B

Operating Cylinder chamber C

Operating piston closingoperation is completion

Closing Pilot Valve resets

Closing Amplification

Valve resets

OPEN command

CLOSE command

Medium Pressure

Operating Cylinder chamber B

Accumulator

Oil Pumpresets

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4.2 Isolators (Disconnecting Switch)The isolators are motor operated. The basic design supports only no-load switching operation, but optional devices

for interrupting capacitive charging current and transformer magnetization current may be added. A mechanicalindicator driven by the operating mechanism provides a visual means to check the isolator position.

page 11 of 16

Cross Section of Earthing Switch

Cross Section of Disconnecting Switch (with Earthing Switch)

High Speed

Earthing Switch

Tulip Contact

Moving

Conductor

Fixed

Contact

Spacer

Insulated

Operating Rod

Current Collector

Conductor

Operating Lever

Maintenance

Earthin Switch

4.3 Earthing Switches (Grounding Switches)Earthing switches are operated by a motor, a motor charged spring or manual, accordingly to the specification.

Earthing switches can be provided on the GIS at any required position. There are two different types of earthingswitches, each with its own particular function: the maintenance earthing switch, and the high-speed earthing switch

for insertion into a circuit that has been accidentally energized. Both designs are fully capable of resisting short-circuit fault currents at their fully engaged positions. The earthing switches can be used as primary probingterminals for checking voltage and currents. It is therefore possible to check the current transformer ratio and

contact resistance without draining SF6 gas. A mechanical indicator driven by the operating mechanism provides avisual means to check the isolator position.

Shield

Insulating Rod Insulator Earthing Bar

Operating Lever

Fixed

Contact

Moving

ConductorCurrent

Collector

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4.4 Busbars

page 12 of 16

Cross Section of Lightning Arrester

Lightning Arrester

JAPAN AE POWER 550kV GIS uses single-phase

segregated-enclosure type busbars as its standard design

in order to meet with broader choice of the customers.Tulip type slide-in connectors are provided at the

connection part. This feature makes on-site busbarconnection work be easy and correct.

4.5 Lightning Arresters (Surge Arresters)A lightning arrester is a device designed to protectelectrical apparatus from high transient voltage andregulate the duration and amplitude of follow current.

JAPAN AE POWER uses Zinc Oxide LightningArrester (ZLA), which satisfy the both requirements by

the characteristics of the zinc-oxide elements.

Enclosure S acer

Conductor

Spacer

Supporting

Insulated Rod

Tulip Contact

Tank

Shield

SF6 Gas

ZnO Element

Absorbent

Conductor

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4.6 Voltage TransformersJAPAN AE POWER uses wound-type voltagetransformers in SF6 gas insulation. These compact

models can be provided to the GIS at any properposition accordingly to the specification. VT design

considers and able to resolve system design concernssuch as overvoltage problems caused by ferro resonance

and excessive discharging current problems through theVT windings by the trapped charge in the transmission

lines.

Cover Plate

page 13 of 16

Cross Section of Current Transformer current transformer

Voltage Transformer

4.7 Current TransformersThe current transformers are ring core type. They aresurrounded by a grounded metal enclosure and shielded

from the high-voltage conductors. This design alsoprotects them from the effects of enclosure current.

Spacer

Conductor

Terminal

Tulip ContactPlate

EnclosureCurrent

Transformer

Secondary Coil

Shield

Conductor

S acer

Primar Coil

Enclosure

Terminal Box

Iron Core

Adapter Flange

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4.8 Interface

4.8.1 Gas to Air BushingsConnecting GIS to overhead lines requires porcelain or polymer gas to air bushings. The shape and length ofthose bushings are determined by the voltage level and pollution condition.

Upper Shield

page 14 of 16

Conductor

Terminal Pad

Bushing

Insulator

(Porcelain)

Tulip Contact

Inner Shield

Conductor

EnclosureSupport

Porcelain Type Polymer Type

Terminal Pad

Conductor

Tulip Contact

Inner Shield

Enclosure

Support

Bushing

Insulator

(Polymer)

Conductor

Upper Shield

Porcelain T e Polymer Type

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4.8.2 Cable Connections 4.8.3 Transformer BushingsThe cable manufacturer supplies the cable sealing endfor the cable connection to the GIS. JAPAN AE

POWER provides the necessary cable box, end coverand connection.

GIS connected directly to a transformer requires

transformer bushings to keep the switchgears SF6gas separate from the transformer insulating oil.Although these bushings are normally part of the

transformer manufacturers scope, JAPAN AEPOWER is capable of supplying them if necessary.

There should also be a bellows near the transformerbushing to compensate for alignment gaps and to

absorb excess vibration.

page 15 of 16

Conductor

Tulip Contact

Bellows

S acer

Removal Link

ConductorEnclosure

Power Cable

Tulip Contact

Transformer

Enclosure

Transformer

Bushing

Removal Link

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Ref. No.GIS550(P1)H1-C

page 16of 16

5. EXPERIENCE RECORD

GIS/GCS with first single break 550kV GCB had been supplied and energized in 1995 at TEPCOs Shin-ImaichiSwitching Station. Since then, 68 breaker units have been supplied to 14 substations for 550kV GIS applications.

Attached are some of the products photos taken in the field.

550kV 63kA GIS for Shanghai CaojingPower Plant (China)

550kV 50kA GIS for Tohoku Electric Power Co.,Kamikita S.S.

550kV 63kA GIS for Shanxi Xilongchi ,Pumped Storage Power Station Project(China)

550kV 50kA H-GIS for Shangdong Electric Power,Yuncheng S.S. (China)

550kV 63kA GIS for Tokyo Electric Power Co.,Higashi Gunma S.S.

550kV 50kA GIS for Hokuriku Electric Power Co.,Minami-Fukumitsu S.S.

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The Right Solution in Power Transmission and Distribution8-3 Nishi-shimbashi 3-chome, Minato-ku, Tokyo 105-0003 Japan

Phone : +81-3-5406-3400 FAX : +81-3-5406-3404

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550kVGIS