Arc fault detector and method

Details Arc fault detector and method Arc fault detector and method

2007-04-17

2007-04-17

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

Reexamination Certificate

active

11312929

ABSTRACT:
An arc fault detector includes a shunt resistor deployed in a protected circuit, an arc discriminator sensing voltages across the shunt resistor and producing an arc indication deduced from current variations associated with parallel and series arc faults, a signal transformer buffering the arc detection signal and producing a pulse, a switch transient detector sensing a voltage differential across load switches and producing a pulsed switch transient signal when the voltage differential across load switches exceeds a reference value, a line interrupter, such as a static relay, a switch controller including logic gates generating a trip signal based on predetermined criteria, and a manual switch for resetting the line interrupter. An embodiment comprises a voltage sensing coil enveloping a toroidal core to detect current variations in conductors passing through the core.

REFERENCES:
patent: 4853818 (1989-08-01), Emery et al.
patent: 5530364 (1996-06-01), Mashikian et al.
patent: 2001/0033469 (2001-10-01), Macbeth et al.

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