| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulation state determination device which determines an insulation state of each of a plurality of ungrounded power sources and permits a power supply from the ungrounded power source in a good insulation state to a load.SOLUTION: First relays 12, 13 are interposed between a high voltage circuit A and a high voltage circuit C, and second relays 14, 15 are interposed between a high voltage circuit B and the high voltage circuit C. To determine an insulation state of each of the high voltage circuits A, B, and C, an insulation state determination circuit 18 is provided. A connection destination of the insulation state determination circuit 18 is switched to one of the high voltage circuits A, B, and C in a predetermined order by a selecting switch 19 to successively determine the insulation state of each of the high voltage circuits A, B, and C. The first relays 12, 13 and/or the second relays 14, 15 interposed between the high voltage circuits A, B not having an insulation failure and the high voltage circuit C are closed. |
