Patent ID: 9091710
Filing Date: 2015-07-28
Classification: G01R

Abstract:
1. A circuit arrangement ( 16 ) for monitoring electrical isolation in a power supply system ( 7 ) which electrical isolation is provided between a high-voltage system ( 8 ) and a low-voltage system ( 9 ) of the power supply system ( 7 ), wherein the high-voltage system ( 8 ) and the low-voltage system ( 9 ) are connected to ground ( 14 ), and wherein the high-voltage system ( 8 ) has a first connection (T+) for a first supply voltage potential and a second connection (T−) for a second supply voltage potential of a voltage source ( 10 ), the circuit arrangement ( 16 ) comprising: at least one variable resistor (Rm 1 , Rm 2 ) connected between the connections (T+, T−) and ground ( 14 ), a voltage measuring device ( 17 ) for detecting a potential shift of the ground ( 14 ) relative to the supply voltage potentials when at least one of the resistors (Rm 1 , Rm 2 ) is varied and an evaluation device, which determines the ability of the electrical isolation to function depending on the detected potential shifts.