Generator trips on V/f protection in isochronus mode

H

Thread Starter

hazim

please give your advise.

we have gas turbine generator type GE frame 5 with excitation prismic A10. our problem is when we operate generator in isochronus mode and our load reach 15 mw, 10 mvar the excitation increased the voltage value to 11.8 kv and generator protection tripped on v/f protection.

pls help me to solve the problem
 
Hazim,

When did this problem start?

What is the frequency when the generator breaker trips?

What is the rated generator terminal voltage?

Is there some large motor/reactive load being started when the V/Hz protection operates?
 
> we have gas turbine generator type GE frame 5 with excitation prismic A10. our problem is when we operate generator in
> isochronus mode and our load reach 15 mw, 10 mvar the excitation increased the voltage value to 11.8 kv and generator
> protection tripped on v/f protection.

decreasing mvar below 5mvar according capability curve
 
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