Insulation resistance measurement device and insulation resistance measurement method

摘要

An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements.

主权项

1. An insulation resistance measurement device for measuring an insulation resistance to ground of a DC circuit, comprising:
first and second connection terminals for connections to two measurement points of the DC circuit; a switch connected between the first and second connection terminals and the ground potential and that switches connections between the first and second connection terminals and the ground potential such that when one of the first and second connection terminals is connected to the ground potential, an other of the first and second connection terminals is not connected to the ground potential; at least one resistive element connected through the switch between the first and second connection terminals and the ground potential; and a voltage detector which detects a voltage drop in the resistive element.