Vacuum contactor protector

Details Vacuum contactor protector Vacuum contactor protector

1976-09-29

1978-08-01

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 2, H02H 722, H02H 328

Patent

active

041046897

ABSTRACT:
A circuit for detecting arcing in a vacuum contactor in a polyphase system, caused by development of an air leak. A current transformer and sensing means, which may be independent of or which may work in conjunction with a conventional ground fault relay, senses the unbalanced leakage current and activates warning and protection circuits so as to prevent damage to the rest of the system. The protection system is activated or switched into a higher sensitivity mode when the vacuum contactor is supposed to be open so as to detect relatively small leakage currents. When the vacuum contactor is supposed to be closed, the system is disabled or is operated in a lower sensitivity mode so as to detect ground faults, but so as not to be tripped by normal surges and transients during operation of the system.

REFERENCES:
patent: 3599041 (1971-08-01), Boersma et al.
patent: 3611340 (1971-10-01), Harte et al.
patent: 3641359 (1972-02-01), McCarty
patent: 3764853 (1973-10-01), Beachley, Jr.
patent: 4024439 (1977-05-01), McClain et al.

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