Apparatus and method to protect motors and to protect motor life

Details Apparatus and method to protect motors and to protect motor life Apparatus and method to protect motors and to protect motor life

1983-11-30

1985-06-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 25, 361 27, 324158MG, 318472, H02H 708

Patent

active

045257639

ABSTRACT:
An apparatus for predicting the remaining useful life of a motor uses the temperature and past history of the motor to determine the amount of insulation degradation for its prediction. The remaining useful life projection is provided at a display and may be used to trip the circuit breakers supplying power to the motor when projected life is shorter than the expected life or may be used to issue a warning that the rate of motor degradation exceeds the rate necessary to achieve the expected life for the motor.
Motor protection is provided by tripping the circuit breakers supplying power to the motor before the actual temperature of the motor windings exceeds the temperature at which catastrophic and irreversible insulation failure would occur while not tripping the breakers for momentary transients.

REFERENCES:
patent: 4319298 (1982-03-01), Davis et al.
patent: 4351029 (1982-09-01), Maxey et al.

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