System for providing protection for a high voltage transmission

Details System for providing protection for a high voltage transmission System for providing protection for a high voltage transmission

1981-10-07

1983-09-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, H02H 326, H02H 726

Patent

active

044059663

ABSTRACT:
Disclosed is a system that provides protection for a high voltage transmission line. The system employs improved polarizing and operating signals for both a phase selector relay and a distance measuring relay. The improved polarizing and operating signals provide an accurate out-of-phase relationship during the presence of normal conditions existing on a high voltage transmission line and an in-phase relationship during the presence of fault or abnormal conditions existing on the high voltage transmission line. The accurate phase relationships are utilized by phase comparator circuits of each of the phase selector and distance measuring relays to obtain desired operating characteristics for each relay. In another embodiment, the desired operating characteristics of the phase selector and distance measuring relays are obtained by an amplitude comparator circuit. In a still further embodiment, the distance measuring relay is operated under the control of the phase selector relay so as to provide the proper desired phase selection and protection of the high voltage transmission line.

REFERENCES:
patent: 4034269 (1977-07-01), Wilkinson
patent: 4092690 (1978-05-01), Wilkinson
patent: 4161011 (1979-07-01), Wilkinson
patent: 4296451 (1981-10-01), Wilkinson
patent: 4342064 (1982-07-01), Wilkinson

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