MONITORING INSULATION FAULTS IN A HIGH-VOLTAGE SYSTEM

摘要

A high-voltage system comprising a high-voltage battery and a DC/DC converter, the high-voltage system having two different galvanically connected voltage levels with enabled DC/DC converters, the high-voltage system having a first measuring device for detecting the voltage of the high-voltage battery and a second measuring device for detecting the voltage at the output of the DC/DC converter, the high-voltage system having an insulation resistance measuring device which is designed in such a way as to carry out insulation resistance measurements only when the DC/DC converter is disabled, wherein the high-voltage system further comprises a third measuring device for detecting a voltage between a positive high-voltage line and the ground and a fourth measuring device for detecting a voltage between a negative high-voltage line and the ground, the high-voltage system having an insulation monitoring device which is designed such that the insulation resistances are monitored from the data of the first to fourth measuring device at least when the DC/DC converter is enabled, and a method for monitoring insulation faults.