Electricity: power supply or regulation systems – Remote sensing
Patent
1974-02-07
1976-01-13
Miller, J. D.
Electricity: power supply or regulation systems
Remote sensing
317 18R, 317156TR, 323 44R, 323 24, 323 6, H02H 308
Patent
active
039327914
ABSTRACT:
An electronic circuit breaker for use in A.C. power circuits is provided with means for varying the overload current response level at which the circuit breaker removes power from the load. The load current is conducted through a primary winding of a transformer, and a circuit breaker switch is responsive to voltage across the secondary winding of the transformer exceeding a predetermined magnitude corresponding to the selected overload current level to remove power from the load. A lockout circuit prevents reapplication of power other than by a manual reset switch. The overload current response level corresponding to the predetermined magnitude of the voltage across the secondary winding is variably selected by varying the inductive coupling between the primary winding and the secondary winding. The primary winding is wound about one leg of a magnetic core and the secondary winding is wound about another leg of the magnetic core. In one embodiment, the inductive coupling is varied by altering a reluctance gap between the first and second legs of the core. In another embodiment, the inductive coupling is varied by changing the effective reluctance of a third leg of the core in parallel magnetic circuit with the first and second legs of the core. Both means for varying the gap and means for varying the effective reluctance of a third leg of the core may be combined to provide different ranges of selectibility. The overload current response level may also be adjusted by varying a reluctance gap in the first leg of the transformer core.
REFERENCES:
patent: 2046748 (1936-07-01), Hudson
patent: 2566260 (1951-08-01), Thomson
patent: 2686290 (1954-08-01), Macklem
patent: 3461378 (1969-08-01), King
patent: 3501677 (1970-03-01), Hurtle
patent: 3683237 (1972-08-01), Walstad et al.
Miller J. D.
Salce Patrick R.
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