Control circuit for resetting circuit breaker UVR solenoid

Details Control circuit for resetting circuit breaker UVR solenoid Control circuit for resetting circuit breaker UVR solenoid

1978-06-05

1980-01-08

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit automatically reconnected only after the fault is...

361 71, 361 92, H02H 324

Patent

active

041830717

ABSTRACT:
DC control voltage derived from the system voltage activates a first relay to apply the control voltage across a dropping resistor and an undervoltage release (UVR) solenoid, thereby holding the UVR solenoid in while the system voltage remains above a minimum level. An energy storage RC network holds the UVR solenoid in for momentary drops in system voltage. In the event of a protracted system undervoltage condition, the first relay drops out to drop out the UVR solenoid and trip a system circuit breaker. When nominal system voltage is restored, the control voltage activates the first relay and, via an RC charging circuit, temporarily actuates a second relay to switch out the dropping resistor, thereby temporarily applying full control voltage across the UVR solenoid to reset it.

REFERENCES:
patent: 3105919 (1963-10-01), Werts
patent: 3590325 (1971-06-01), McMillen et al.
patent: 3718839 (1973-02-01), Conti et al.
patent: 3757202 (1973-09-01), Prouty et al.
patent: 3772568 (1973-11-01), Phillips
patent: 4011484 (1977-03-01), Paice et al.

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