Signal quality monitor for protective relay system

Details Signal quality monitor for protective relay system Signal quality monitor for protective relay system

1984-12-17

1986-05-27

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 78, 361 66, 455135, 455136, H02H 300

Patent

active

045919402

ABSTRACT:
A signal quality monitor, and a protective relay system using the monitor, which utilizes both AC and DC signals from the receiver agc stage to monitor a plurality of different signal parameters. A signal responsive to the noise in the communication channel which transmits at least one of the protective relay signals used in a protective relay comparison function, is also used in the trip circuits of the associated circuit interrupter to continuously adapt or modify the trip level in response to channel noise.

REFERENCES:
patent: 3707651 (1972-12-01), Lensner et al.
patent: 4056838 (1977-11-01), Leib
patent: 4071873 (1978-01-01), Andow et al.

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