Apparatus for detecting abnormal conditions of transmitted signa

Details Apparatus for detecting abnormal conditions of transmitted signa Apparatus for detecting abnormal conditions of transmitted signa

1976-06-21

1978-01-31

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 361 68, H02H 328

Patent

active

040718735

ABSTRACT:
In a protective relaying system wherein a carrier wave frequency modulated by an electric quantity is transmitted to a receiving station for operating a relay and an abnormal condition of the transmitted signal is detected by detecting the frequency variation of the carrier wave, there is provided an abnormal condition detector which compares the lengths of contiguous or closely adjacent periods, or functions thereof, of the received carrier wave.

REFERENCES:
patent: 3437937 (1969-04-01), Warfield
patent: 3668474 (1972-06-01), Knox
patent: 3729654 (1973-04-01), Yeager
patent: 3904969 (1975-09-01), Eastmond
patent: 3940698 (1976-02-01), Itoh

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