Common mode current feed fault protection

A system comprising:

• a generator;
• three alternating current (AC) feeders configured to feed AC output from the generator;
• a rectifier electrically connected to the three AC feeders, the rectifier configured to convert three-phase AC from the three AC feeders of the generator into direct current (DC) output to a load via a first DC feeder and a second DC feeder;
• a first resistor connecting between the first DC feeder and ground;
• a second resistor connecting between the second DC feeder and ground;
• at least one current sensor including at least one of:
• a first current sensor operatively connected to detect current in the first DC feeder;
• a second current sensor operatively connected to detect current in the second DC feeder;
• or
• a single current sensor operatively connected to detect net common mode current of the first and second DC feeders;
• and
• a controller configured to:
• receive input from the at least one current sensor;
• monitor for changes in a common mode current based on the input from the at least one current sensor;
• determine presence of a fault if a change in the common mode current exceeds a predetermined threshold;
• and
• determine the fault is located in one of the AC feeders if the net common mode current follows an AC waveform.