INSULATION-DEGRADATION DETECTING DEVICE

摘要

Disclosed is an insulation-degradation detecting device without having a problem of voltage drift capable of quickly returning to a measurable state even when a disturbance voltage is applied. Since current injection to a fixed voltage and current drawing to a fixed voltage are performed, the problem of voltage drift does not occur even when there is an imbalance between injected current and drawn current. Moreover, even when a high disturbance voltage is applied from a side of an insulating capacitor adjacent to a DC power source, current drawing (or current injection) to the fixed voltage is performed during a cycle immediately after the disturbance voltage application, resulting in quick return to the original measurable state.