Current ratio-differential relay

Details Current ratio-differential relay Current ratio-differential relay

1983-11-18

1985-07-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 36, H02H 328, H02H 728

Patent

active

045300259

ABSTRACT:
A current ratio-differential relay for protecting a power system comprises a logical circuit which provides the final output upon determination that the operating force signal is active and the suppressing force signal is inactive. The operating force signal is made active when the scalar quantity of the vector summation of line currents flowing into and out of the bus-bar is larger than a certain value, and the suppressing force signal is made active when the maximum value of scalar quantities of the line currents is larger than the scalar quantity of the vectorially-summed current multiplied by a certain constant. Both signals are supplied to the logical circuit through circuit means having a certain time delay in the restoring operation.

REFERENCES:
patent: 3754163 (1973-08-01), Sykes
patent: 3984734 (1976-10-01), Becker
patent: 4204237 (1978-11-01), Zocholl
patent: 4402028 (1983-08-01), Udren
BBC Publication CH-ES 36-10 E, "Electronic Busbar Protection (based on directional comparison)", p. 4, 1975.

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