Synchronism check relay

Details Synchronism check relay Synchronism check relay

1984-01-18

1985-08-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 74, 361 75, 361 85, H02H 722

Patent

active

045381976

ABSTRACT:
A synchronism check relay includes both a high set and a low set slip cut-off circuit. The low slip cut-off setting is based upon the maximum slip frequency that can be tolerated and still allow reclosing. The high slip cut-off setting is a function of the maximum phase angle difference permissible between the voltages on the bus and line sides of the circuit breaker, and the time that the line is de-energized.

REFERENCES:
patent: 2249513 (1941-07-01), Wurth
patent: 2311474 (1943-02-01), Seeley
patent: 2445804 (1948-07-01), Seeley
patent: 3471749 (1969-10-01), Harris
patent: 3704392 (1972-11-01), Chen et al.
patent: 3801796 (1974-04-01), Konrad
patent: 4090090 (1978-05-01), Johnston
patent: 4231029 (1980-10-01), Johnston

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