Hi experts! I have hipot tested a 1000pF UR4LL vacuum capacitor today. It did clunk a couple of times at approx 4 kV and then it settled down. The it clunked a couple times at 8 kV and settled down.
OM: I have a commercial Hipot tester which can be varied from 0 to 9kv. I tested several vac variables I have and here are the leakage results. 1. 1000pf @ 5kv. 1ua at 5kv, 5ua @ 7.5kv. 2. 1000pf @ 3
Looks like mine behaves similar to your number 4. Several sources state that the clunks are OK to get rid of impurities as long as there is not too many clunks heard. Another cap of similar type, how
Is your Hi-Pot tester a DC tester or does it have some AC on it? The reactance of 1000pF at 50Hz is 3.2M ohm and a 10kV rms (14kV peak) AC only Hi-Pot would result in 3.1mA due to the capacitive reac