CPC H02H 3/17 (2013.01) [G01R 27/18 (2013.01)] | 16 Claims |
1. A method for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter, comprising the method steps:
applying a measuring voltage between an active conductor of the power supply system and ground and detecting a measuring signal driven by the measuring voltage,
detecting a displacement voltage between an active conductor of the power supply system and ground on an input side of the converter,
filtering a switching-frequent signal portion, which is generated by the converter, from the detected displacement voltage,
evaluating the filtered, switching-frequent signal portion,
triggering a switching signal should the evaluation of the switching-frequent signal portion yield that the switching-frequent signal portion surmount a critical amplitude value.
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