Phase loss detection circuit including transient protection

Details Phase loss detection circuit including transient protection Phase loss detection circuit including transient protection

1987-09-17

1989-04-18

Tolin, Gerald P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 88, 361 91, H02H 300

Patent

active

048232262

ABSTRACT:
A phase loss detection circuit for a three phase electrical system providing three phase power as to a motor, the three phase electrical being subject to a phase loss condition and a transient condition is disclosed. The transient condition includes starting transients, stopping transients or severe load transients. The phase loss detection circuit distinguishes between a phase loss condition and a transient condition and indicates when a loss of phase has occurred. The phase loss detection circuit comprises a detector for detecting an instantaneous voltage of the electrical system, a sensor for generating an instantaneous voltage signal representing the instantaneous detected voltage, a detector for detecting a peak detected voltage of the electrical system, a generator for generating a peak detected voltage signal representing said peak detected voltage, a comparator for comparing the peak detected voltage with the instantaneous voltage and generating a compared signal, the compared signal comprising a first polarity during steady state operation, a second, opposite polarity during the transient condition and an alternating polarity during the phase loss condition, and a detector for detecting the alternating polarity, thereby indicating the phase loss condition.

REFERENCES:
patent: 4420788 (1983-12-01), Wilkinson et al.
patent: 4686601 (1987-08-01), Alexander et al.

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