Digital distance relay

Details Digital distance relay Digital distance relay

1985-11-06

1987-08-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, 364483, 364492, H02H 326

Patent

active

046897097

ABSTRACT:
In a digital distance relay, the distance measuring operation is performed only regarding the phase on duty in the third step if there is no fault, and it is performed regarding either the third and first steps or the third and second steps if a fault is detected within the third step. Thereby the processing time for the distance measuring operation may be reduced is that corresponding to two steps per sampling.

REFERENCES:
patent: 4261038 (1981-04-01), Johns et al.
patent: 4344143 (1982-08-01), Kurosawa et al.
patent: 4377833 (1983-03-01), Udren
patent: 4507700 (1985-03-01), Andow et al.
patent: 4577254 (1986-03-01), Yamaura
General Electric Company Limited, Publication R-5283, Type MM3T Static Distance Protection Scheme 399/3940, Jun. 25, 1975.

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