Protecting system for transmission lines

Details Protecting system for transmission lines Protecting system for transmission lines

1982-07-08

1984-10-16

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361115, H02H 904

Patent

active

044778554

ABSTRACT:
Transmission lines have both their terminals connected with bus lines through breakers, respectively, and connected to earth through earth switches, respectively. Protecting relay devices are fed with not only the outputs of voltage transformers and current transformers but also the contact signals made coactive with the breakers and earth switches at the terminals considered. Those contact signals are transmitted through signal transmission devices to the other terminals, and the contact signals of the breakers and earth switches at the other terminals are transmitted. The protecting relay devices detect the fault of the transmission lines, if any, to trip the breakers and to confirm the open states of the breakers from the breaker contact signals of the terminals considered and the other terminals thereby to close the earth switches. These earth switches are opened after a suitable time period to confirm the open states thereof from their contact signals at the terminals considered and the other terminals thereby to reclose the breakers.

REFERENCES:
patent: 4130850 (1978-12-01), Cronin et al.
The Application of High-Speed Grounding Switches for Single Pole Reclosing on 500 kV Power Systems" IEEE Transactions on Power Apparatus and Systems, vol. PAS 100, No. 4, Apr. 1981.

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