The way I understand things is that A HiPot test is a Destructive Test. Meaning That if it Fails and the Milliammeter Pegs then you have "Punched through the insulation" We Have only used A HiPot tester on High Voltage Cables (5 to 15Kv) I've Personally only used it twice. The last time I HiPotted the wind was blowing and the other end of the cable was exposed and I could tell the wind gusts by the milliamp readings. (the manual says to use "SaranWrap" and cover the ends to the cable under test to reduce Corona Loss But it Blew off and it was a slow 7 mile trip to get to the other end of the HV Cable)
I Use a 500 Volt Megger allot, Mostly for checking motor windings. One Customer asks us to test their cooling tower motors yearly. If you have moisture in the windings it will probably fail shortly
Most of us use the old style Biddle AVO hand crank meggers. I Prefer them to fancy digital Meggers, It's like a wiggy compared to a Multimeter.
J Spade
