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GCB
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B.Al
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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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