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

1976-08-20

1977-10-11

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 84, H02H 726, H02H 328

Patent

active

040539407

ABSTRACT:
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 transmmitter having the higher keying threshold level is located at that end of the protected line section where outfeed is expected.

REFERENCES:
patent: 3986079 (1976-10-01), Hinman et al.

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