Krzysztof Guzek GCB Presentation Itaipu Event Eng_reduzida_cd

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Krzysztof Guzek

20 years Itaipu / 50 years HVDC anniversary

Generator Circuit Breakers:Products and applications

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

Generator Circuit Breaker Factory

View on the View on the assembly line assembly line in Zurichin Zurich

Generator Circuit Breaker

HV-CBGCB

Where is the GCB?

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

A history of ABB Generator Circuit Breaker #1

1954:1954:GCB type DBGCB type DB

ABB Generator Circuit Breaker # 2

1969:1969:GCB type DRGCB type DR


1985:1985:GCB type HEKGCB type HEK


1995:1995:GCB type HECGCB type HEC


2000:2000:GCB type HEC 7/8GCB type HEC 7/8


20032003GCB type HECSGCB type HECS

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

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

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)

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

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

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

Optimizing power plantsOptimizing power plants

Layouts with Generator Circuit Breakers are...

...economical

...technically safe

...reliable

...compact

...approved

...maintenance free

Krzysztof Guzek GCB Presentation Itaipu Event Eng_reduzida_cd

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