FLASHING ON A METERING CB

[PUNGLU]

We have undertaken studies on the cause of flashing on a yellow phase spout. The latest having destroyed the 11kV indoor CB. The CB was installed for a client whose load is mostly compressors, airconditioners and freezers. What could be the likely causes and what remedies do you suggest. This is the third time the spout flashed and a solution must be found.

Thanks guys

 

[ScottyUK]

Can you post some photos of the damage? It could be any number of causes from the (lack of) information posted.


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If we learn from our mistakes I'm getting a great education!

 

[waross]

Could the problem be originating on the incoming feeders?
Something that imposes overvoltages on the yellow phase.
A faulty lightning arrestor somewhere upstream comes to mind.

Bill
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"Why not the best?"
Jimmy Carter