INSULATION DETECTOR AND ELECTRIC APPARATUS

摘要

An insulation detector for highly accurately detecting or measuring, with a simple configuration, insulation resistance of a load or an apparatus to a ground or a housing and connected to an electric apparatus including one or both of an intra-apparatus capacitor and a battery, the insulation detector including an intra-insulation detector capacitor, a voltage detecting unit that detects a voltage of the intra-insulation detector capacitor, and a current-path forming switch for connecting the ground or the housing, the intra-apparatus capacitor, and the intra-insulation detector capacitor in series and forming a current path including insulation resistance of the electric apparatus. The insulation detector measures the insulation resistance by measuring a time constant of a change in the voltage of the intra-insulation detector capacitor. A capacitance value of the intra-insulation detector capacitor is a value negligible in the measurement of the insulation resistance compared with a capacitance value of the intra-apparatus capacitor.

主权项

1. An insulation detector connected to an electric apparatus including an intra-apparatus capacitor, the insulation detector comprising:
an intra-insulation detector capacitor; a voltage detecting unit to detect a voltage of the intra-insulation detector capacitor; and a current-path forming switch to connect a ground or a housing, the intra-apparatus capacitor, and the intra-insulation detector capacitor in series and form a current path including insulation resistance of the electric apparatus, wherein the insulation detector measures the insulation resistance by measuring, with the voltage detecting unit, a time constant of a change in the voltage of the intra-insulation detector capacitor, and a capacitance value of the intra-insulation detector capacitor is a value negligible in the measurement of the insulation resistance compared with a capacitance value of the intra-apparatus capacitor.