Ground fault protection in a high resistance grounding system

A ground fault protection system comprising:

• a power switch including a source-side and a load-side, the power switch being structured to receive a load current from a power source at the source-side and selectively output the load current from the load-side to a load;
• a first voltage measuring device structured to measure a first voltage of the source-side while the power switch is conducting the load current;
• a second voltage measuring device structured to measure a second voltage of the load-side while the first voltage measuring device is measuring the first voltage;
• and
• a controller structured to determine a source-side-to-ground voltage based on the first voltage, determine a load-side-to-ground voltage based on the second voltage, determine a ground fault is occurring, and determine a direction of the ground fault relative to the power switch by comparing the source-side-to-ground voltage and the load-side-to-ground voltage;
• wherein the controller determines whether to mitigate the ground fault based on the direction of the ground fault by opening the power switch in response to the controller determining two ground faults are occurring on different phases.