H - Electricity – 02 – H
Patent
H - Electricity
02
H
317/11, 348/31,
H02H 3/46 (2006.01) H02H 3/16 (2006.01)
Patent
CA 1167907
ABSTRACT OF THE DISCLOSURE 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.
376565
Swabey Ogilvy Renault
Tokyo Shibaura Denki Kabushiki Kaisha
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