Protective relaying system

Details Protective relaying system Protective relaying system

1978-06-13

1980-10-14

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 82, 364492, 364483, H02H 328, H02H 726

Patent

active

042284767

ABSTRACT:
In a protective system which operates in response to a plurality of state quantities, for example voltage and current, one of which being a digital code signal having a long code length and transmitted over a transmission circuit, the density of the code errors of the digital code signal is detected. A plurality of state quantities are processed by a processor including first means responsive to the digital code signal and second means not responsive to the digital code signal. Either one of the first and second means is selected according to the density of the code errors.

REFERENCES:
patent: 3569785 (1971-03-01), Durbeck et al.
patent: 3643027 (1972-02-01), Goldberg
patent: 3646517 (1972-02-01), Waters et al.
patent: 3721959 (1973-03-01), George
patent: 3790769 (1974-02-01), Ziegler
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4038636 (1977-07-01), Doland
patent: 4061997 (1977-12-01), Niethammer et al.
patent: 4071873 (1978-01-01), Andow et al.
patent: 4091239 (1978-05-01), Lainey et al.
patent: 4091240 (1978-05-01), Lainey et al.
patent: 4107778 (1978-08-01), Nii et al.

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