Phase balance monitoring system incorporating voltage and phase

Details Phase balance monitoring system incorporating voltage and phase Phase balance monitoring system incorporating voltage and phase

1978-03-13

1980-04-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

324 86, 340658, 340663, 361 92, H02H 326

Patent

active

041997980

ABSTRACT:
A phase unbalance detecting system that includes also low-voltage detection and wrong-phase-sequence detection. The system can be packaged in a small volume because it is a solid state type that uses a minimum of electronics and does not require transformers for obtaining signals from the several phases of the plural-phase power line but only one transformer for the D.C. power supply circuit for the detection system. The system incorporates means for allowing it to be used at 50 or 60 Hz without separate adjustment, for making it insensitive to noise and harmonics of the power line, and for providing a good estimate of the negative sequence voltage caused by a phase unbalance. It provides external terminals whereby it can be adapted for use at different power line voltages.

REFERENCES:
patent: 3535591 (1970-10-01), Holmquist
patent: 3539868 (1970-11-01), Stevenson
patent: 3648112 (1972-03-01), Beckwith
patent: 3699441 (1972-10-01), Linders
patent: 3848160 (1974-11-01), Boothman
patent: 4007401 (1977-02-01), Kimmel et al.
patent: 4060843 (1977-11-01), Bost
"Handbook of Operational Amplifier Active RC Networks", Burr-Brown Research Corp. 1966, pp. 27-31 and 74-75.

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