Digital protective relay system

Details Digital protective relay system Digital protective relay system

1984-11-20

1987-11-24

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

364483, 364492, H02H 300

Patent

active

047092955

ABSTRACT:
In a digital protective relay system for protecting an electric power system, a first digital operation device receives digital data on the electrical quantities of the power system and performs an operation on the digital data to produce an intermediate result, which is then stored in a memory unit. A second digital operation device reads the intermediate result from the memory unit and performs an operation on the intermediate result to produce a final result. The memory unit is so connected as to permit writing by the first operation device only, and to permit reading by the second operation device only.

REFERENCES:
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4313169 (1982-01-01), Takagi et al.
patent: 4339802 (1982-07-01), Yamaura et al.
patent: 4344143 (1982-09-01), Kurosawa et al.
patent: 4371947 (1983-02-01), Fujisawa
patent: 4435764 (1984-03-01), El-Gohary
patent: 4455612 (1984-06-01), Girgis et al.
patent: 4528611 (1985-07-01), Udren
patent: 4570231 (1986-02-01), Bunch

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