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

Claim 13:
14. A method for ground fault monitoring for an energy storage system, the method comprising:
arranging an isolation monitoring unit between an energy storage system and a ground element, the isolation monitoring unit comprising a first switchable resistor branch, a second switchable resistor branch and a third switchable resistor branch;
arranging a first main switch and a second main switch between the energy storage system and an external energy supply system;
closing 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
disconnecting the first switchable resistor branch from the energy storage system and connecting 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.