Current transformer damage

[alisha]

Could it be disbalance of load on generator reason for damage one of the current transformer in protection loop?

 

[Marvo]

I don't see how an unbalanced load could damage a CT. Can you give us a circuit diagram and more information on the damage to the transformer?

 

[alisha]

Please find wiring dagram.

 

[alisha]

Generator is 350 KVA and usual load about 50% but recently disbalance appeared probably because load bank failure, we observed difference in phase current and it were about LI-200A L2-200A and L3-100A and burned transformer was on phase L3 reviled it later after ACB trip by multifunctional relay.

 

[alisha]

Thanks Elena and what do you think could reason of CT damage?
Existing current transformer manufacture ‘’Frer’’ type TA0008800K01 Ratio 800/1 A 0.72-3kV 5P15 M0503 resistance secondary winding 11 Ω but failed CT was 5.6Ω

 

[Knobhead]

Have sent you a PM

 

[alisha]

Did you send me any files?

 

[Knobhead]

No, I sent a web address

 

[alisha]

thanks i have registered already