Vacuum monitor device and method for vacuum interrupter

Details Vacuum monitor device and method for vacuum interrupter Vacuum monitor device and method for vacuum interrupter

1982-10-29

1985-10-15

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340605, 340644, G08B 2100

Patent

active

045477698

ABSTRACT:
An abnormally high vacuum pressure of a vacuum interrupter is detected from outside of the interrupter in response to electromagnetic wave signals generated by an electric discharge derived in response to a voltage difference and depending upon Paschen's law. Since the above-mentioned electric discharge is quite different from so-called partial discharge, even when the fixed and movable contacts are closed (i.e., under hot-line condition), it is possible to detect poor vacuum pressure on the basis of the electric discharge existing between the fixed and movable contact rods including two contacts and the main shield, as well as when the two contacts are open. The vacuum monitor according to the present invention comprises a rod or loop antenna fixedly or movably disposed near a conductive material of or connected to the vacuum interrupter and a detection section including, in particular, a 2 to 20 KHz band-pass filter.

REFERENCES:
patent: 3090207 (1963-05-01), Smith et al.
patent: 3403297 (1968-09-01), Crouch
patent: 3594754 (1971-07-01), Voshall
patent: 3882380 (1975-05-01), Black
patent: 4021702 (1977-05-01), Rimmrott
patent: 4034264 (1977-07-01), Muller et al.
patent: 4103291 (1978-07-01), Howe et al.
patent: 4159466 (1979-06-01), Darrel
patent: 4402224 (1983-09-01), Fukushima
patent: 4440995 (1984-04-01), Lange et al.
"Vacuum Techniques in Modern Circuit Breakers", Electronics & Power, Mar. 21, 1974, by T. V. Armstrong, and P. Headky, pp. 198-201.

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