HRG GROUND FAULT DETECTOR AND METHOD

摘要

A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first input A coupled to a first phase PHA of the HRG system, a second input B coupled to a second phase PHB, and a third input C coupled to a third phase PHC, with the HRG ground fault detector generating a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC, wherein the simulated neutral voltage VN′ comprises a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal, comparing the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detecting a HRG ground fault if the simulated neutral voltage VN′ exceeds the threshold.

主权项

1. A HRG ground fault detector configured to detect a ground fault in a High Resistance Ground (HRG) system, the HRG ground fault detector comprising:
a first input A adapted to be coupled to a first phase PHA of the HRG system; a second input B adapted to be coupled to a second phase PHB of the HRG system; and a third input C adapted to be coupled to a third phase PHC of the HRG system; the HRG ground fault detector being configured to generate a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC, wherein the simulated neutral voltage VN′ comprises a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal, compare the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detect a HRG ground fault in the HRG system if the simulated neutral voltage VN′ exceeds the predetermined fault voltage threshold.