Hi Pot Test Duration for Dist. C.B!!

[tmaly1]

We are hi-pot testing our 4.16 kV distribution circuit breakers at 15 kV (AC) for two-three minutes, I was reading the circuit breaker spec. manual and it says test the breakers for 5-20 seconds!!! I'm seeking your opinion for the reasonable testing duration in order not to deteriorate the breaker insulation integrity!! Thanks in advance for your help and participation.

 

[alehman]

In general, you should follow the manufacturer's recommendations. I don't think you would risk damaging the breaker unless the recommended test voltage is exceeded, if that's your concern.

What kind of breaker? What voltage? Were you testing pole-to-pole, pole-to-ground or across open contacts?