Instrument to measure the errors of apparent power meters

Details Instrument to measure the errors of apparent power meters Instrument to measure the errors of apparent power meters

1989-09-20

1990-06-26

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 74, 324140D, 324141, 324620, 328163, G01R 1900, G01R 2904

Patent

active

049375202

ABSTRACT:
An instrument to determine, under actual field conditions, which type of VA demand meters are most appropriate for a particular consumer. The type of electrical load that the consumer places on an electrical supply system can introduce harmonics and phase distortion in the system resulting in VA meters producing incorrect readings. These VA meters are intended to measure the true apparent power S which is defined as S=V.sub.rms XI.sub.rms but, are generally designed to operate according to one of the following approximate formula:

REFERENCES:
patent: 2213099 (1940-08-01), Adorjan
patent: 2564829 (1951-08-01), Bedford et al.
patent: 2648821 (1953-08-01), Petzinger
patent: 4542514 (1985-09-01), Watanabe

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