Solid state overload relay circuit

Details Solid state overload relay circuit Solid state overload relay circuit

1976-02-02

1977-08-09

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 31, 361 71, 361 96, 361109, H02H 7085

Patent

active

040415406

ABSTRACT:
A self-powered solid state overload relay circuit having current transformers energized by conductors supplying current to a multiphase alternating current motor. The transformers have secondary windings connected to charge a capacitor with a voltage indicative of the magnitude of the maximum current in the motor windings. The circuit includes presetable impedance circuits which permit the circuit to be easily programmed to respond to a range of abnormal motor currents in the winding in motors of varying size and service factor ratings, components which are arranged to duplicate the operation of melting alloy and bimetal type overload relays in an automatic or in a trip-free manual reset mode, a light emitting device which visually indicates when the relay is in a tripped state, and components which cause the relay to be insensitive to ambient temperature variations.

REFERENCES:
patent: 2965809 (1960-12-01), Edsall
patent: 3100854 (1963-08-01), Riebs
patent: 3327168 (1967-06-01), Buchner
patent: 3327171 (1967-06-01), Lipnitz et al.
patent: 3781607 (1973-12-01), DiMarco et al.
patent: 3851216 (1974-11-01), Clarke
patent: 3919600 (1975-11-01), Sons

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