A fuel cell system or HVDC power source includes a fuel cell or DC power
source having a high voltage direct current (HVDC) bus including
y-capacitors, which connect the HVDC bus terminals to chassis or safety
ground, and a fault current discharge compensation circuit interconnected
with the HVDC bus. A monitoring circuit monitors a fault discharge
current of the Y-cap circuit and generates a fault signal when the fault
current occurs based on a rate of change of a voltage of the Y-cap
circuit. A switching circuit redirects the majority of the fault
discharge current.