Electronic relay for calculating the power of a multiphase elect

Details Electronic relay for calculating the power of a multiphase elect Electronic relay for calculating the power of a multiphase elect

1997-01-24

1998-07-07

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 79, 361187, 318729, 364483, H02H 504

Patent

active

057778337

ABSTRACT:
An electronic relay having a current sensor device (C1, C2, C3), logic inputs (3) and an electronic circuit (4) provided with processing means capable of calculating, from the current signal (I) supplied by the current sensor device and a rectified voltage signal (V) supplied by one of the logic inputs, the value of the power factor of the motor (cos.phi.) and/or the value of the power supply voltage (U) of the motor.

REFERENCES:
patent: Re33874 (1992-04-01), Miller
patent: 4300182 (1981-11-01), Schweitzer, III
patent: 4335437 (1982-06-01), Wilson et al.
patent: 4400655 (1983-08-01), Curtiss et al.
patent: 4703387 (1987-10-01), Miller
patent: 4864287 (1989-09-01), Kierstead

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