DISCONNECTION DISCRIMINATION DEVICE AND WIRING DISCRIMINATION DEVICE OF DC POWER SUPPLY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a disconnection discrimination device of a DC power supply circuit capable of discriminating presence of disconnection and quality of wiring connection of the DC power supply circuit in a hot-line state.SOLUTION: When presence of disconnection is inspected, a connection terminal 22 is connected to an electric wire located at a DC power supply 11 side of an inspection object circuit. A compulsive grounding switch 25 of a grounding unit 23 is turned on and a connection section of the connection terminal 22 is grounded to the earth via a grounding device 24. A DC probe current limited by a current-limiting resistor 26 is supplied to an inspection object circuit from the DC power supply 11. A voltage current determination unit 29 of the grounding unit 23 performs quality determination of a ground voltage at the connection section detected by a voltage detection unit 27 and a probe current flowing through the connection section detected by a current detection unit 28. Disconnection of a DC power supply circuit is discriminated based on determination results of the voltage current determination unit 29. Therefore, disconnection of the DC power supply circuit can be discriminated even in a hot-line state.SELECTED DRAWING: Figure 1