Differential current protection circuits

Details Differential current protection circuits Differential current protection circuits

1990-03-12

1991-09-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, H02H 328

Patent

active

050478907

ABSTRACT:
A differential protection circuit includes a pair of current transformers each having a secondary winding and each being inductively coupled to a power conductor at a different location. The secondary windings of these transformers are electrically connected in series with each other in a loop in a bucking arrangement. A resistor is connected in parallel with the secondary winding of each transformer. Control circuits are connected to sense a voltage signal appearing across the resistor and to take appropriate action when the sensed voltage reaches a predetermined level. An additional winding on one of the transformers provides isolation between the loop and one of the control circuits to prevent false tripping of the differential protection circuit.

REFERENCES:
patent: 3294976 (1966-12-01), Tipton et al.
patent: 3539820 (1970-11-01), Kessler
patent: 3683199 (1972-08-01), Billings et al.
patent: 3748493 (1973-07-01), Billings et al.
patent: 4173774 (1979-11-01), Hyvarinen et al.

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