Differential-type protective relay

Details Differential-type protective relay Differential-type protective relay

1984-12-19

1987-06-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 326

Patent

active

046708111

ABSTRACT:
In a differential-type protective relay actuated to generate a signal necessary for the protection of a bus of an electric power system when a troubled current has flown through the bus, a gapped first transformer is used to receive an output from a current transformer which is adapted to detect each current in the bus. Each output of a first detection element, which is actuated when the output of the first transformer is higher than a preset level, is fed out to the exterior only when a value obtained by subtracting the sum of the maximum of the output of the first transformer and the value of a signal obtained by shifting the phase of the output through a predetermined angle from the value of a signal obtained by subjecting the output of the first transformer to full-wave transformation is equal to or lower than a preset value.

REFERENCES:
patent: 3218516 (1965-11-01), Sharp
patent: 3488559 (1970-01-01), Souillard
patent: 3633070 (1972-01-01), Vassos et al.
patent: 3732463 (1973-05-01), Dale
patent: 3962606 (1976-06-01), Burns et al.
patent: 4081852 (1978-03-01), Coley et al.
patent: 4208690 (1980-06-01), McGinnis et al.
patent: 4258403 (1981-03-01), Shimp
patent: 4344100 (1982-09-01), Davidson et al.

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