Control

Generator Circuit Breaker

A

Thread Starter

Anonymous

Why is GCB placed after GT and not in between Generator and Generator transformer(GT)?
 
B

Bala

It is not in all the cases GCB is mounted after GT. When the generator size is less say 5 MW then we can have GCB 500A breaker for 13.8kV (5x1000/1.732x13.8). However when the Generator size is high say 500MW then the GCB current rating is as high as 12000A at 25kV (500 x 1000/1.732x25). Huge size. Generator will have filed breaker. For any fault between generator and GT, GCB, field breaker will be trip and tripping sequence differs taking into consideration mechanical system turbine etc.
 
A

Anonymous

Dear Bala,

Thank you very much for your reply. Now I've got a somewhat clear idea about GCB. If you know more about it, you can send it to me. (priyamanavan_gy @ zapak. com)

Thank you.
 
You must log in or register to reply here.
Thread starter Similar threads Forum Replies Date
M Generator Circuit Breaker low SF6 pressure in close position Power Generation 11
S When 2 out of 3 poles of the circuit breaker of a Generator are closed Power Generation 3
K problem with hydraulic spring operating mechanism generator circuit breaker Power Generation 6
S Short Circuit level for delta run of single phase Generator Transformer Power Generation 0
S Sizing grounding transformer connected for delta side of Generator transformer when Generator circuit breaker is open Power Generation 17
Similar threads
Generator Circuit Breaker low SF6 pressure in close position
When 2 out of 3 poles of the circuit breaker of a Generator are closed
problem with hydraulic spring operating mechanism generator circuit breaker
Short Circuit level for delta run of single phase Generator Transformer
Sizing grounding transformer connected for delta side of Generator transformer when Generator circuit breaker is open

You May Also Like

Top