Apparatus for measuring quantity of AC electricity

Details Apparatus for measuring quantity of AC electricity Apparatus for measuring quantity of AC electricity

1985-03-06

1987-05-19

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

364483, G01R 2106

Patent

active

046671986

ABSTRACT:
An apparatus for measuring the quantity of AC electricity, comprising a first and a second arithmetic circuit capable of calculating values corresponding to the sum of and the difference between each sample value obtained by sampling the quantity of AC electricity at a predetermined sampling period and the sample value obtained one sampling period before the former, and a third arithmetic circuit capable of calculating a value corresponding to the difference between the respective output signals of those two arithmetic circuits.

REFERENCES:
patent: 4291377 (1981-09-01), Schneider et al.
patent: 4345311 (1982-08-01), Fielden
Krajewski, R.; "The Chameleon Plus"; Byte; Jun. 1984; pp. 327-330, 332, 334, 336.
Protective Relay Engineering, pp. 112-113, The Electric Society of Japan, (Published Jul. 20, 1981).

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