Phase imbalance detection circuit

Details Phase imbalance detection circuit Phase imbalance detection circuit

1975-06-02

1977-05-03

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

340248B, 328151, 361 76, 361 88, H02H 312

Patent

active

040217035

ABSTRACT:
A phase imbalance logic module for a solid state motor protection system for a three-phase motor. Three-phase line currents are converted to corresponding voltages and rectified. The resultant output voltage is a poorly regulated DC voltage having a ripple of approximately 4% during normal operating conditions. In the event of a phase failure, even if not total, the corresponding ripple percentage increases. The phase imbalance logic network senses ripple and provides an output signal to trip a protective circuit breaker if the component of ripple becomes significantly large.

REFERENCES:
patent: 3123813 (1964-03-01), Baude
patent: 3300650 (1967-01-01), Daien
patent: 3575637 (1971-04-01), Krieger et al.
patent: 3636541 (1972-01-01), Genuit et al.
patent: 3846692 (1974-11-01), Hill

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