Capacitive charging current is one of the 3 leakage currents you are measuring with IR testing, it tends to decay pretty quickly as the cable is charged, we typically look at the capacitive element by calculating a DAR (Dielectric Absorbsion Ratio) which is determined by dividing the 60 second reading by the 30 second reading. Different ratios apply to different types of equipment but you should always have a DAR of at least 1.0 or more (>1.6 is excellent). >8.0 DAR however would usually means the insulation has become embrittled.
