Phase unbalance protector

Details Phase unbalance protector Phase unbalance protector

1981-02-02

1982-05-25

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 92, H02H 324

Patent

active

043319955

ABSTRACT:
There is disclosed apparatus for detecting phase unbalance in a 3-phase electric power system and initiating protective shutdown for motors or other loads in the system which includes a 3-phase rectifier, a peak voltage measuring circuit, a comparison circuit for comparing each phase maximum with a predetermined proportion of the peak voltage and generating a pulse whenever a phase maximum exceeds the predetermined proportion of the peak voltage, a missing-pulse detection circuit receiving the pulses, a fault circuit producing a fault signal in response to a signal from the missing-pulse circuit, a delay circuit responsive to the fault circuit and a visual indicator and relay for indicating a persistent phase unbalance fault and initiating protective action.

REFERENCES:
patent: 3155880 (1964-11-01), Salina
patent: 3783341 (1974-01-01), Beckwith
patent: 4021703 (1977-05-01), Gary et al.
patent: 4222008 (1980-09-01), Mezrich
patent: 4238811 (1980-12-01), Fry

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