Importance of Pre-Fault Time Setting in Relay Testing The pre-fault time setting in relay testing is important in certain scenarios. Here's when it is important and when it is not: When it is important: Testing self-powered relays: In some applicatio

VLF hipot and VLF testing is as simple as an AC hipot on lower frequency output (at 0.1 Hz). The only way to field test high capacitance loads with AC voltage, like cables and motors/generators, is to use a VLF AC hipot. Lower the frequency, Lower w