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khvyas1983
Member

Join Date: Sep 2010
Posts: 7

Requirement of Generator Circuit Breaker

10/23/2010 7:26 AM

What is the requirement of generator circuit breaker in power plant? Can't generator be tripped directly by switchyard bay breaker? In my previous company there was not GCB, generator was directly connected to grid with GT + switchyard breaker. While, in my present company, there is a Generator + GCB + GT + switchyard breaker scheme.

What is the criteria that GCB should be there in design or not?
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Anonymous Poster
#1

Re: Requirement of Generator circuit breaker

10/23/2010 7:41 AM

caution/protection/maintenance/isolation/designing.
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: Requirement of Generator Circuit Breaker

10/24/2010 7:38 AM

Even though it is called a "Circuit Breaker", it can only be used as a switch-cum-isolator as it does not have any short-circuit making and/or short circuit breaking capacity. It is more used as an isolator.
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pcchatur
Power-User

Join Date: Mar 2010
Location: BHOPAL, INDIA
Posts: 201
Good Answers: 20
#3

Re: Requirement of Generator Circuit Breaker

10/24/2010 2:51 PM

Where the generator is connected to GT with circuit breaker in between, auxiliary power for power station can be drawn from the grid through GT (back charging) while keeping the generator isolated during any shut down.
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bsekhar
Associate

Join Date: Jun 2010
Location: INDIA
Posts: 27
Good Answers: 1
#4

Re: Requirement of Generator Circuit Breaker

10/24/2010 11:39 PM

IT DEPENDS ON THE USAGE AND APPLICATION.

FOR LARGE UMPPS THERE IS NO GCB.

IF THERE IS A GCB FOR SMALLER GT BASED PLANTS UPTO 200MW SINGLE UNIT THE AUXILLARY TRANSFORMER CAN BE SAVED .

BASICALLY IT OFFERS A LOT OF ADVANTAGES AND FLEXIBILITY IN CASE YOU HAVE A GCB.

AS FOR EXAMPLE IN INDIA TATA MUNDRA 5X800MW UNITS ALSO GCB IS USED.

__________________
 S BHATTACHARYA
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rajakumar1985
Participant

Join Date: Jun 2011
Posts: 2
#5
In reply to #4

Re: Requirement of Generator Circuit Breaker

07/20/2011 1:10 AM

dear sir,

my name is deen iam working in thermal power palnt as a AE.,, i need GCB operation and scheme.,, can u //.

if u can.,, forward to <email removed>

thanking you

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Anonymous Poster (1); bsekhar (1); electricalexpert65 (1); pcchatur (1); rajakumar1985 (1)

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