Protective relaying system

Details Protective relaying system Protective relaying system

1982-09-29

1985-04-16

Wise, Edward J.

Boots, shoes, and leggings

361 80, G06F 1546, G01R 3108

Patent

active

045119813

ABSTRACT:
A protective relaying system which detects a fault in an electric power system having a circuit breaker by using a current and a voltage of the electric power system. The protective relaying system includes input conversion unit adapted for connecting the electric power system to receive a first and a second input signals corresponding to the current and the voltage and for converting the magnitude and/or the phase of the first and second input signals to produce a first, a second and a third electrical quantities. The protective relaying system also includes comparing unit connected to receive the first, second and third electrical quantities, for comparing the first and second electrical quantities to produce a first logical state signal, and comparing the third and a fourth electrical quantities to produce a second logical state signal cyclically, and for producing a logical state signal including the first and second logical state signals cyclically. The protective relaying system further includes digital data processing unit connected to receive cyclically the logical state signal, for producing a first and a second serial logical state signals and for judging whether a phase-rotation sequence of the first and second serial logical state signals equals a predetermined sequence to produce a protection relay output signal. The protection relay output signal is used to trip the circuit breaker.

REFERENCES:
patent: 3723864 (1973-03-01), Ricard
patent: 4313169 (1982-01-01), Takagi et al.
patent: 4321681 (1982-03-01), Sackin et al.
patent: 4335437 (1982-06-01), Wilson et al.
patent: 4371908 (1983-02-01), Andow et al.
patent: 4428022 (1984-01-01), Engel et al.
patent: 4455612 (1984-06-01), Girgis et al.

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