Microprocessor controlled fault indicator having inrush...

Details Microprocessor controlled fault indicator having inrush... Microprocessor controlled fault indicator having inrush...

2008-01-01

2008-01-01

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S133000, C324S530000, C340S657000

Reexamination Certificate

active

07315169

ABSTRACT:
A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, at least one light emitting diode (LED) visible from the exterior of the fault indicator upon the occurrence of a fault and which may be automatically reset to a non-fault indicating position a predetermined time after the occurrence of the fault, and electronic circuitry for sensing a fault, for actuating the LEDs to indicate a fault and for resetting the LEDs to a non-fault indicating condition a predetermined time after the fault has occurred. The electronic circuitry conserves energy by drawing insubstantial current from the high capacity battery during non-fault conditions. The electronic circuitry may also include in-rush restraint to avoid false tripping of the fault indicator during surges. An inrush restraint circuit has an output signal that is logically combined with a fault indicator signal to disable the fault indicator during inrush conditions. An improved electrostatic sensor senses the electromagnetic field associated with a monitored conductor, provides less susceptibility to affects from adjacent conductors and provides operating power to the inrush restraint circuitry.

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