Circuit and method for discriminating the source of waveform dis

Details Circuit and method for discriminating the source of waveform dis Circuit and method for discriminating the source of waveform dis

1995-11-01

1998-08-04

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324 7631, 324522, 324620, 307105, 361 79, G01R 2106, G01R 2320, H02P 1330

Patent

active

057899282

ABSTRACT:
A circuit to discriminate the source of harmonic distortion of the output voltage comprises voltage sensors coupled to the output terminals of a source of electric power and to a point of regulation remote from the source for sensing the output voltage waveform present at each of these locations. The circuit then utilizes these two sensed waveforms to discriminate the source of any harmonic distortion between the source of electric power and the utlization equipment. This circuit calculates the percentage total harmonic content of each of the sensed waveforms, and compares them to determine the source of distortion. If the percentage total harmonic content sensed at the point of regulation is greater than that sensed at the terminals of the source of electric power, the source of distortion is discriminated to be the utilization equipment; otherwise, the source of distortion is identified to be the source of electric power. The circuit also calculates the actual voltage difference between the two sensed voltages, and senses the current flowing in the feeders which is compared with a profile of the normal voltage drop versus connected load to generate an expected voltage drop. The two voltage difference signals are then compared. The circuit indicates the source of the harmonic distortion as the utilization equipment when the actual voltage difference deviates from the expected drop by greater than a predetermined amount.

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