H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/78
H04B 3/54 (2006.01)
Patent
CA 1056461
ABSTRACT OF THE DISCLOSURE A receiver is provided for utilization in a protective relaying modem to effectively distinguish between two mutually exclusive signal frequencies in a given frequency channel and which are respectively indicative of a "fault" or "no-fault" con- dition in a remote power transmission line. The received signals are coupled to a channel detector which utilizes a local oscilla- tor and mixers to translate the received signal down in frequency so that simple low pass filters can isolate the desired frequency channel. The outputs of the low pass filters are operated on by a combination of multipliers and differentiators to generate an AM related output and a FM related output. The FM signal output of the channel detector is DC in nature and has an amplitude pro- portional to the deviation of the received signal frequency from the center frequency of the channel. This signal is used by separation circuitry to ascertain a fault or no-fault condition. The AM output is a DC signal that is proportional to the strength of the received signal and is analyzed to determine if the origin- ally received signal was generated or unacceptably affected by electronic noise. If the noise content does not fall within the predeterminably set limits, any "fault" condition signal is auto- matically inhibited until the validity of such signal can be as- certained. The detection time for ascertaining whether a valid fault signal has been received can be adjusted to achieve a min- imum yet effective detection time. The output of the receiver indicating a fault condition can be utilized to control various circuit breakers in the power transmission system.
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