The insulation fault tester szhino-6 is used as an accessory of the IT isolation power supply system and is matched with the insulation monitor szhino-1. The working mode is: when the insulation monitor szhino-1 detects that there is an insulation fault in the it isolated power supply, the insulation monitor szhino-1 will notify the insulation fault tester szhino-6 through 485 communication and internal relay. At this time, the insulation fault tester szhino-6 sends a detection signal of no more than 1mA in the it power supply circuit, and the insulation fault tester szhino-6 will test the branch with insulation fault according to this detection signal

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