Current differential fault detection circuit

Details Current differential fault detection circuit Current differential fault detection circuit

1975-02-10

1976-11-16

Broome, Harold

317 36TD, 317 31, 317 27R, H02H 722, H02H 338

Patent

active

039926494

ABSTRACT:
A current differential fault detection circuit. This circuit is used with a plurality of main current transformers respectively coupled to a plurality of separate conductors through which current flows into and out of a sectionalized portion of an a-c electric power system. The secondary windings of the main current transformers are connected in parallel with one another. A normally non-conducting solid state a-c switch is connected in series with the primary winding of an auxiliary transformer and the series combination is connected in parallel with the secondary windings of the main current transformers. Circuit means is provided for sensing the voltage across the secondary windings of the main current transformers. When the secondary winding voltage exceeds a predetermined level the a-c switch is triggered into conduction thereby allowing the fault current to flow through the primary winding of the auxiliary transformer. Circuitry connected to the secondary winding of the auxiliary transformer senses the fault current level and produces an output when the fault current exceeds a predetermined level.

REFERENCES:
patent: 2548625 (1951-04-01), Seeley
patent: 3160788 (1964-12-01), Antoszewski et al.
patent: 3602771 (1971-08-01), Walstad et al.
patent: 3633071 (1972-01-01), Fendt et al.
patent: 3668470 (1972-06-01), Ambler et al.
patent: 3683237 (1972-08-01), Walstad et al.
patent: 3723815 (1973-03-01), Ambler et al.

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