Maximum Acceptable Tan Delta Value of 132KV SF6 Circuit Breaker

If I recall correctly, calculating a tan-delta (or insulation power factor) value of an SF6 circuit breaker means very little, because the leakage currents (usually in microamps!) are usually so small small that even slight measurement errors cause large variation in calculated results. The better measure of condition is to compare test values between the poles of the breaker, and with values from comparable breakers.

Thanks a lot for your reply. May I get typical maximum acceptable tan delta value for above mentioned 132 kv sf6 circuit breaker.

rashid

IT can be from 10pf to 10 micro farad depending upon features which are not in itsef binding but are design factor dependent.