Method and device for distinguishing between partial discharge a

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location

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324772, 361 33, G01R 3112

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active

054753120

ABSTRACT:
A method and device for distinguishing between partial discharge and electrical noise in high voltage conductors such as in motor and generator stators, power cables, gas insulated switchgear and other equipment where high voltage insulation is subject to deterioration. A series of comparators sets a trigger threshold and a voltage range, set by a computer, whereby pulses falling within the voltage range are sampled at four short intervals and then four longer intervals to produce a general pulse width profile. The voltage range is varied by the computer so that a number of voltage ranges are sampled during each selected portion of an ac cycle. The pulse width of pulses falling within each voltage range is recorded by the computer, and displayed graphically. In a preferred embodiment the device is provided with two channels, for receiving a signal from each end of a partial discharge detector described in U.S. Pat. No. 4,949,001. In a preferred embodiment the method and device provide information concerning the polarity, arrival time and width of the measured pulses, which thus enables the operator to distinguish between partial discharge and noise and to detect the general location from which the pulse originated.

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