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Electrical fault detection system

  • US 20040100742A1
  • Filed: 11/20/2003
  • Published: 05/27/2004
  • Est. Priority Date: 11/22/2002
  • Status: Active Grant
First Claim
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1. A microcontroller-based system for detecting ground-fault and grounded-neutral conditions in an electrical power distribution system having line and neutral conductors, comprising a sensor producing an output signal responsive to current flow in both the line and neutral conductors of the electrical power distribution system, a circuit interrupter for interrupting current flow in said power distribution system in response to a trip signal, a microcontroller receiving said sensor output signal and initiating the generation of a trip signal upon detection of a ground-fault or a grounded-neutral condition in said power distribution system, said microcontroller being programmed to use said sensor output signal to detect ground-fault conditions during spaced time intervals, and use said sensor output signal to detect grounded-neutral conditions during intervening time intervals between said spaced interval.

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