Differential relay for protecting an electrical power transmissi

Details Differential relay for protecting an electrical power transmissi Differential relay for protecting an electrical power transmissi

1986-04-09

1988-07-26

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 361 87, H02H 330

Patent

active

047604875

ABSTRACT:
A differential relay includes two apparatus each associated with a different monitoring point on the line being protected by the relay. Each apparatus includes means for deriving digital data representative of the current monitored at the respective point, at time intervals defined by a clock within the apparatus. The two points are linked by a digital data communication channel, and information transmitted between the two points is used to compute digital data for the two points at substantially the same time, from digital data derived at different instants at the two points.

REFERENCES:
patent: 3944888 (1976-03-01), Clark
patent: 4275429 (1981-06-01), Church et al.
patent: 4538196 (1985-08-01), Son et al.
patent: 4612594 (1986-09-01), Yamaura et al.
patent: 4674002 (1987-01-01), Li et al.

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