The insulation resistance test is a direct current evaluation test of the insulation and gives a reliable indication of the presence of moisture, contamination, or breakdown in the insulation. This test also establishes a benchmark for future comparative tests.
Leakage Current Test (On-Line)
Primarily designed for MOSA (Metal Oxide Surge Arresters), this test uses HFCT connected online to the MOSA ground using Doble’s LCM500
PD defined is a localized dielectric breakdown within a small portion of an electrical insulation system under stress of high voltage, which does not bridge the space between two conductors. Partial Discharge is not yet a complete failure of the insulation, however, it is an indication of what is to come. PD testing determines the presence, and locates PD activity within a system.