Ground-fault resistance measurement circuit and ground-fault detection circuit

Abstract

There is a ground-fault resistance measurement circuit which measures a ground-fault resistance between a conductive frame body of electrical equipment and a charge section insulated from the frame body. This ground-fault resistance measurement circuit includes: a capacity which is connected between the charge section and the frame body; a switch which opens and closes a connection path between the charge section and the capacity; a charging unit which charges the capacity to a predetermined voltage; a voltage measurement section which measures a charging voltage of the capacity; a discharge control section which connects the capacity and the charge section after the capacity is charged, and discharges the capacity; and a calculation section which calculates a resistance between the charge section and the frame body, based on a change in the charging voltage of the capacity.

Dependencies are inferred from the claim text.