Transmission line protection system

Details Transmission line protection system Transmission line protection system

1985-11-05

1987-06-23

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 62, 361 93, 361107, H02H 726

Patent

active

046757732

ABSTRACT:
A transmission line protection system arranged such that a leakage current detector is provided at an end of an insulating device such as an insulator connected at one end to a corresponding one of arms of a steel tower and connected at the other end to a transmission line of each phase, thereby detecting an arrester leakage current flowing in the transmission line of each phase, an output signal of the leakage current detector being led to a repeater through an optical fiber cable, an output of the repeater being transferred to a control/supervisory board in a substation through an optical fiber cable. In the control/supervisory board, preferably, a received digital signal which was converted from an analog signal at said leakage current detector is displayed on a cathode ray tube. In such an arrangement, it is possible to smoothly perform supervision of the status of the transmission lines without causing maloperations due to influences from the transmission lines.

REFERENCES:
patent: 3259762 (1966-06-01), Skuderna
patent: 3992649 (1976-11-01), Kotheimer et al.
patent: 4321645 (1982-03-01), Thom et al.
patent: 4393430 (1983-06-01), Hughes

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