MONITORING DEVICE FOR MONITORING AN ELECTRICAL ENERGY SOURCE WITH RESPECT TO THE SOURCE VOLTAGE THEREOF AND THE INSULATION RESISTANCES THEREOF, HIGH-VOLTAGE SYSTEM, AND METHOD FOR OPERATING THE MONITORING DEVICE

摘要

A monitoring apparatus for monitoring of an electrical energy source features one measuring circuit for each pole of the energy source, which is designed to connect the particular pole via a voltage divider to the reference potential. An evaluating device is provided to detect a particular voltage value at the particular voltage divider and based on the detected voltage values, determines a source voltage datum for the source voltage of the energy source. For at least one of the measuring circuits the total electrical resistance is dependent on a switch state of a particular switching element, and the evaluation device is designed, by switching of the particular switching element, to adjust at least two different switching constellations of the measuring circuits, and based on the voltage values detected for the switching constellations, determines overall resistance data for isolation resistances of the energy source.