Modified offset keying apparatus for phase comparison relaying

Details Modified offset keying apparatus for phase comparison relaying Modified offset keying apparatus for phase comparison relaying

H - Electricity

02

H

348/25

H02H 7/26 (2006.01) H02H 3/28 (2006.01) H02H 3/30 (2006.01)

Patent

CA 1085953

MODIFIED OFFSET KEYING APPARATUS FOR PHASE COMPARISON RELAYING ABSTRACT OF THE DISCLOSURE Phase comparison relaying apparatus wherein the keying threshold levels at the local and remote ends of a protected power line section are each offset by a different value from the effective zero axis of the current waveform. One of the keying threshold values is set at a magnitude which will cause a trip response in the presence of low or medium magnitudes of outfeed current. The other keying threshold level is set at a magnitude which will cause a trip response in the presence of maximum magnitudes of expected outfeed current. The upper and lower current margin threshold levels are set to appropriately reflect the keying threshold level with which they are respectively associated. In addition, the transmitter having the higher keying threshold level is located at that end of the pro- tected line section where outfeed is expected.

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