Circuit arrangement for monitoring the phase sequence of a rotar

Details Circuit arrangement for monitoring the phase sequence of a rotar Circuit arrangement for monitoring the phase sequence of a rotar

1979-02-22

1981-07-14

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 83R, G01R 2500

Patent

active

042789370

ABSTRACT:
A circuit arrangement for monitoring the phase sequence of a rotary field includes a voltage comparator which is provided and which receives one half-waves from two phases and the other half-wave of a third phase is fed, inverted, to its first input in order to form a measuring voltage and a non-inverted half-wave is fed to a second input as a reference voltage. The voltage comparator is adjusted so that it emits an error signal which characterizes an erroneous phase sequence when the reference voltage exceeds the measuring voltage.

REFERENCES:
K. R. Williams, "Primary Power Phase Monitor", IBM Tech. Journal, (Bulletin), vol. 19, No. 11, (Apr. 1977), pp. 4297-4298.
V. A. Corchero, "AC Power Line Monitor", IBM Tech. Bulletin, vol. 16, No. 8, (Jan. 1974), pp. 2760-2761.
Electronics, Jun. 9, 1977, p. 247.

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