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l rig

hts

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rved

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GCB HistoryLech SkrobalaBU High Current Systems

Zrich / Switzerland

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GCB in Power Plant

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ABB Generator Circuit-Breakers around the Globe

As of Mai 2005

172146

982141

1928

DRDRTE36.150

DBAS

487

Airblast

532314392

43462

3117

HEC, HECIHEF, HEK

HEIHGC

HGCSHGF, HGI

1173

201HECS

SF6

1954 -1993DB

1969 - 1998DR+E36 1984 - 1995HEK

1992 -HGI

1998 - 2003HGC3

New Technology

Air Blast - SF6

1995 - 2003HEC

HECS 2003 -

New

Interru

pter

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-The Old GCB

70 000UNITS

Type DB AIRBLAST CIRCUITType DB AIRBLAST CIRCUIT--BREAKERBREAKER

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-The Big One

AIRBLAST GENERATOR CURCUITAIRBLAST GENERATOR CURCUIT--BREAKERBREAKERType DR 36 u 1750 DType DR 36 u 1750 D

Ratings: 36 kV; 24000 A; 200 kARatings: 36 kV; 24000 A; 200 kA

Cover and side panels removedCover and side panels removed

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-1985: The first Delivery in SF6 Technology

TYPE HEK 3 CIRCUITTYPE HEK 3 CIRCUIT--BREAKERBREAKER

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-Worldwide SF6 Generator Circuit-Breaker Type H

895

794

100

100

924

26

WorldUnknown 77 2916

As of Mai 2005

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SF6 Generator Circuit-Breakers HEC 7, HEC 8, HECS Worldwide

3

2654

8

4

77

32765 WorldUnknownAs of Mai 2005

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-Range of Generator Circuit Breakers / High Current Systems

HEC 3HEC 3--88

HGC 3HGC 3

HGCSHGCS

160

63

50

4500 7500 28000Load Current in A

Shor

t Circ

uit C

urre

ntin

kA

HGI 2-3

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Range of Generator Circuit Breaker Systems

HEC 3-8 (HEI 3-5)

HGI 2

HGI 3/ HGC-3

Load CurrentLoad Current in Ain A6300A6300A 7700 (8000)7700 (8000) AA 28000 A28000 A

Shor

t Circ

uit C

urre

ntSh

ort C

ircui

t Cur

rent

in k

Ain

kA

5050

6363

160160

Un = 17.5kVUn = 17.5kV

Un = 24 - 30kVUn = 24 - 30kV

Un = 21kVUn = 21kV

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Range of Generator Circuit Breakers

For power of the unit:For power of the unit:

up toup to 80-80-100 100 MW:MW: HGI2HGI2up to 150-180MW:up to 150-180MW: HGI 3, HGC 3HGI 3, HGC 3up to 300-400 MW: up to 300-400 MW: HEC 3, HEC 5, HECI 3, 5HEC 3, HEC 5, HECI 3, 5up to 400-600 MW: up to 400-600 MW: HEC 4, HEC 5 (with cooling unit)HEC 4, HEC 5 (with cooling unit)up to 1000-1600 MW:up to 1000-1600 MW: HEC 7/8HEC 7/8

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Summary of main technical parameters

TypeType [kV][kV] [A] [A] [[kA]kA]HGI2HGI2 17.517.5 6300 6300 5050HGI 3HGI 3 17.517.5 80008000 6363HGC 3HGC 3 1717.5.5 75007500 6363HEC 3HEC 3 2424 12 00012 000 100100HEC 4HEC 4 2424 13 00013 000 100100HEC 4 HEC 4 f.cf.c 2424 24 000*) 24 000*) 100100HEC 5HEC 5 2424 12 00012 000 120120HEC 6HEC 6 2424 13 000 13 000 120120HEC 6 HEC 6 f.c.f.c. 2424 24 000*)24 000*) 120120HEC 7HEC 7 3636 24 00024 000 160160HEC 8HEC 8 3636 28 000**)28 000**) 160160

*) *) with forced coolingwith forced cooling **)**) with enhenced convectionwith enhenced convection

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Range of Generator Circuit Breakers

For power of the unit:For power of the unit:

up toup to 80-80-100 100 MW:MW: HGI2HGI2up to 150-180MW:up to 150-180MW: HGI 3, HGC 3HGI 3, HGC 3up to 300-400 MW: up to 300-400 MW: HEC 3, HEC 5, HECI 3, 5HEC 3, HEC 5, HECI 3, 5up to 400-600 MW: up to 400-600 MW: HEC 4, HEC 5 (with cooling unit)HEC 4, HEC 6 (with cooling unit)up to 1000-1600 MW:up to 1000-1600 MW: HEC 7/8HEC 7/8

HECS

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1998: HEC 7/8 World Biggest in SF6 Technology1998: HEC 7/8 World Biggest in SF6 Technology

G Tx

Aux Tx1 23 4

5

6 7 8 9

10 11

12 13

14

15 16

1 Circuit breaker2 Disconnector3, 4 Earthing switches5 Short-circuiting/braking switch6...9 Voltage transformers

10, 11 Current transformers12, 13 Protective capacitor14 Surge arrester15, 16 Terminals (limits of supply)

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Generator Circuit Breaker Type HEC 7/8Generator Circuit Breaker Type HEC 7/8

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Size of HEC 7/8 Chamber

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Typical Electrical Layouts of Power Plants

G

EHV

MT

UTSS

GenCB

SFC

Example of layouts

for gas turbine power plantsA without generator circuit-breaker

B with generator circuit-breaker

G

EHV HV

MT

STSS

SFC

AUX

A B

Abbreviations

M /U /S T Main / Unit / Station transformer

GenCB Generator circuit-breaker

SS Starting switch

SFC Static frequency converter

EHV Transmission system

HV Sub-transmission system

AUX Generator auxiliaries

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Transformer Failures without GCB

Fault Current

Is + Ig

IgIg

tens of msinterruption by HV

circuit-breaker

seconds

Ig Is

Main Transformer

HV - Bus

t

G

Fast-deexcitation of generatortakes seconds

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Transformer Failures with GCB

Fault Current

Is + Ig

IgIg

tens of ms

interruption by HVcircuit-breaker

seconds

Ig Is

Main Transformer

HV - Bus

t

G

interruption byGenCB

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Pressure Rise in a Transformer

full winding shortedgenerator side

full winding shortedHV side

tank withstand pressure fault to tank from HV winding

shorted winding

tap changer contact fault

HV-Circuit-Breaker GCB

t (ms)

2.5

2.0

1.5

1.0

0.5

50 100 150 200 250

over

pres

sure

(bar

)

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Transformer Explosion in GermanyTransformer Explosion in Germany

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Split Generator ShaftSplit Generator Shaft

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