Patent ID: 11881708
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A system comprising:
a generator;
three AC feeders connected for feeding AC output from the generator;
a rectifier electrically connected to the three AC feeders, the rectifier being configured to convert three phase AC from the three AC feeders of the generator into DC output to a load via a first DC feeder and a second DC feeder;
a first resistor connecting between a the first DC feeder and ground;
a first voltage sensor operatively connected to detect voltage across the first resistor;
a second resistor connecting between the second DC feeder and ground;
a second voltage sensor operatively connected to detect voltage across the second resistor; and
a controller operatively connected to receive input from the first voltage sensor and from the second voltage sensor, wherein the controller is configured to monitor for changes in common mode voltage based on the input from the first sensor and from the second sensor, and to determine presence of a fault if change in the common mode voltage exceeds a predetermined threshold, wherein the controller is configured to determine presence of a fault if change in value of the common mode voltage exceeds a predetermined threshold, wherein the controller is configured to determine the fault is located in one of the AC feeders if the common mode voltage follows an AC waveform.