Overload protective device of electric motors

Details Overload protective device of electric motors Overload protective device of electric motors

1978-11-01

1981-01-20

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 31, H02H 308

Patent

active

042466229

ABSTRACT:
A static type overload relay is used to protect a motor against overload. The overload relay comprises an integrator for integrating the difference between the motor current and a continuous current carrying capacity of the motor. When the output of the integrator exceeds a predetermined value, a circuit breaker connected in series with the motor is tripped.

REFERENCES:
patent: 3558978 (1971-01-01), Nye, Jr. et al.
patent: 3786311 (1974-01-01), Hobson, Jr. et al.

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