Patent ID: 11879949
Assignee: VOLVO CAR CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 0:
1. A ground fault monitoring system for an energy storage system, the ground fault monitoring system comprising:
an isolation monitoring unit;
a first main switch;
a second main switch; and
a control unit;
the isolation monitoring unit being arrangeable between the energy storage system and a ground element;
the first main switch and the second main switch being arrangeable between the energy storage system and an external energy supply system;
the isolation monitoring unit comprising a first switchable resistor branch, a second switchable resistor branch and a third switchable resistor branch;
the control unit being configured to close the first main switch and the second main switch during charging of the energy storage system for connecting the energy storage system to the external energy supply system; and
the control unit being further configured to disconnect the first switchable resistor branch from the energy storage system and connect the second switchable resistor branch and the third switchable resistor branch to the energy storage system for monitoring a current leakage to the ground element during charging of the energy storage system.