Frequency relay for use in the protection of electric power tran

Details Frequency relay for use in the protection of electric power tran Frequency relay for use in the protection of electric power tran

1981-04-30

1984-08-28

Orsino, Jr., Joseph A.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 39, 377 43, 324 78D, 324 83R, G01R 3108

Patent

active

044687966

ABSTRACT:
A digital frequency relay for use in protecting an electrical power transmission line in the event of frequency deviations indicative of a fault condition, including an input device for receiving AC electric signals, and an oscillator for generating a reference frequency, which are connected to respective first and second counters which respectively count the number of output pulses from the oscillator during the AC electric signal positive half-cycle, and during the AC electric signal negative half-cycle. The resultant output from the first and second counters is added and compared with a set value to produce a trip signal for the frequency relay.

REFERENCES:
patent: 3895293 (1975-07-01), Munz
patent: 4050747 (1977-09-01), Ruhnau et al.

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