krzysztof guzek gcb presentation itaipu event eng_reduzida_cd
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© A
BB L
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Krzysztof Guzek
20 years Itaipu / 50 years HVDC anniversary
Generator Circuit Breakers:Products and applications
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ABB High Current SystemsABB High Current SystemsABB High Current Systems
Manufacturing and design in Zurich, Switzerland94 EmployeesRevenues: over 70 MUS$ p/aDeliveries: 280 - 300 GCB's p/aMarket share: >70%
November 2004:More than 3000 GCB‘s with SF6 technology (since 1985) orderedMore than 2,850 ABB GCB’s (SF6) in operation worldwide
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Generator Circuit Breaker Factory
View on the View on the assembly line assembly line in Zurichin Zurich
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Generator Circuit Breaker
HV-CBGCB
Where is the GCB?
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Where is the GCB in the power plant layout? Where is the GCB in the power plant layout?
without without Generator Generator Circuit BreakerCircuit Breaker
with with Generator Generator Circuit BreakerCircuit Breaker
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A history of ABB Generator Circuit Breaker #1
1954:1954:GCB type DBGCB type DB
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ABB Generator Circuit Breaker # 2
1969:1969:GCB type DRGCB type DR
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ABB Generator Circuit Breaker # 3
1985:1985:GCB type HEKGCB type HEK
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ABB Generator Circuit Breaker # 4
1995:1995:GCB type HECGCB type HEC
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ABB Generator Circuit Breaker # 5
2000:2000:GCB type HEC 7/8GCB type HEC 7/8
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ABB Generator Circuit Breaker # 6
20032003GCB type HECSGCB type HECS
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Portfolio 2005Portfolio 2005
HECPS 3/5HECPS 3/5
HGI 3HGI 3
6.36.3 88 2828
Sho
rtS
hort
Circ
uit C
urre
ntC
ircui
t Cur
rent
in k
Ain
kA
5050
6363
160160
UnUn = 24kV= 24kV
UnUn = 21kV= 21kV
1313
130130
210210
100100
8080
HECSHECS--80,100,13080,100,130HECI 3/5RHECI 3/5R
1818Nominal Nominal CurrentCurrent in kAin kA
f.c.f.c.HECSHECS--130130
HEC 7/8HEC 7/8UnUn = = 25.2 25.2 -- 30kV30kV
HGI 2HGI 2UnUn = 17.5kV= 17.5kV
140140
2323
HEC 7SHEC 7S
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Type HECS Generator Circuit Breaker
Generator Circuit Breaker System
hydraulic spring drive with disc spring energy storage
Maintenance free up 20 years or 20'000 CO
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Switching Operation
Synchronizes Generator with the gridSynchronizes Generator with the grid
Conducts and switches Generator Nominal CurrentConducts and switches Generator Nominal Current
Switches ShortSwitches Short--circuit Current feeder from gridcircuit Current feeder from grid
Switches ShortSwitches Short--circuit Current feeder from generator(s)circuit Current feeder from generator(s)
Switches outSwitches out--ofof--phase current (up to 180°) phase current (up to 180°)
Switches all asymmetrical currents (till 130% asymmetry)Switches all asymmetrical currents (till 130% asymmetry)
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Impact of using a GCB
Station transformer and HV-switchbay can be omitted
Aux. supply can be drawn directly from unit transformer
Automatic change - over equipment is not required
Division of responsibility clearly defined
Lower installation costs
G2 G3 G4
GCB1
G1
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Impact of using a GCB in power layout
Fewer switching operations (lower likelihood of switching errors)
Rapid interruption of generator-source short circuit current
Rapid disconnection of generator in case of short timeunbalanced load
Higher availability of the power plant
Lower support costs
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GCB applications and ABB services
In: all type of power plants
For: new power plants, replacement and retrofit
Offer: customised solutions
Standards: ANSI and IEC
Service: world wide 24 hours
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Optimizing power plantsOptimizing power plants
Layouts with Generator Circuit Breakers are...
...economical
...technically safe
...reliable
...compact
...approved
...maintenance free
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