Electrical fault detection system

Details Electrical fault detection system Electrical fault detection system

2006-07-18

2006-07-18

Tso, Edward H. (Department: 2838)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S045000, C361S057000, C361S063000, C361S093100

Reexamination Certificate

active

07079365

ABSTRACT:
A microcontroller-based system to detect ground-fault and grounded-neutral conditions in a monitored circuit of an electrical distribution system having line and neutral conductors. The system includes a single sensor producing an output signal responsive to current flow in both the line and neutral conductors of the monitored circuit, and a microcontroller receiving the sensor output signal and initiating the generation of a circuit status signal indicating one of a normal operating condition, a ground-fault condition or a grounded-neutral condition in the monitored circuit. The microcontroller is programmed to continuously test for ground-fault conditions by evaluating the sensor output signal and, at selected intervals, test for grounded-neutral conditions by evaluating the sensor's output signal response to a microcontroller initiated ping in the sensor circuit.

REFERENCES:
patent: 3801871 (1974-04-01), Loh
patent: 3879639 (1975-04-01), Sircom
patent: 4053815 (1977-10-01), Sircom
patent: 4063815 (1977-12-01), Wilken et al.
patent: 6259996 (2001-07-01), Haun et al.
patent: 1006584 (1977-03-01), None

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