Three phase power monitor

Details Three phase power monitor Three phase power monitor

1991-10-15

1994-08-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 78, 361 29, H02H 326, H02H 348

Patent

active

053372069

ABSTRACT:
A three-phase power monitor operates a contactor between a supply of three phase electrical power and a three phase load. A phase integrity detector has three inputs connected respectively to the three phases of the electrical power. If a loss, reversal, or dissymmetry is detected, a photoemitting device is actuated. Actuation can also result from low or high line frequency. A power supply circuit is input with the three phases of power and has an output providing a dc level corresponding to the voltage level of the three-phase electrical power. A hold circuit has a first time constant associated with it and attains a hold level when current is applied to its input, but reverts to a release level after this current ceases. An interrogator circuit is coupled to the power supply and to the input of the hold circuit and provides a periodic recharge current to the hold circuit at a period that is shorter than the period of the hold circuit. A high/low voltage level detector interrupts the periodic recharge current if the dc level is outside a predetermined voltage limit. A photosensor-based discharge circuit is optically coupled to the photoemitting device of the three phase integrity detector, and is electrically coupled to the hold circuit for discharging the time constant circuit thereof if a phase loss or phase imbalance is detected.

REFERENCES:
patent: 4354214 (1982-10-01), Walton
patent: 4989155 (1991-01-01), Begin et al.

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