Arrangement for the measurement of reactive power or reactive en

Details Arrangement for the measurement of reactive power or reactive en Arrangement for the measurement of reactive power or reactive en

1992-07-10

1993-11-16

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324107, 324142, 364483, G01R 1116, G01R 2106

Patent

active

052627152

ABSTRACT:
A circuit is disclosed for measuring reactive energy or reactive power. The circuit comprises a main multiplier, a signal/frequency converter, and a frequency divider all connected in series to form a cascade circuit having an output connected to a display. A 90.degree. phase shifter has an input for receiving a first signal component (e.g., alternating voltage) of the reactive energy or power. A second signal component (e.g., alternating current) is connected to a second input of the main multiplier. The phase shifter has a frequency dependent transfer function K[f]. In order to eliminate the effect of this transfer function on the measurement of reactive power or reactive energy, the arrangement includes a frequency measurement circuit for measuring the frequency of the first signal component and a frequency/signal converter for generating an output signal dependent on K[f]. The output signal of the frequency/signal converter is connected to an input of the cascade circuit so that the frequency dependence of the phase shifter is eliminated from the output of the cascade circuit.

REFERENCES:
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patent: 4131847 (1978-12-01), Kohga et al.
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patent: 4620157 (1986-10-01), Hayashi
patent: 4663587 (1987-05-01), Mackenzie
patent: 4788619 (1988-11-01), Ott et al.
patent: 5017860 (1991-05-01), Germer et al.

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