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Vacuum monitor device and method for vacuum interrupter

Shozo Tanigaki, +2 more
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TLDR
In this article, an abnormally high vacuum pressure is detected from outside of the interrupter in response to electromagnetic wave signals generated by an electric discharge derived in response of a voltage difference and depending upon Paschen's law.
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.

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Proceedings ArticleDOI

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TL;DR: In this paper, the authors proposed a continuous vacuum monitor based on low pressure vacuum gauges, which is considered an optimal engineering choice as it does not impact the design of the VI.
References
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Patent

Leak sensor and indicating system for vacuum circuit interrupters

Francis Milton Howe, +1 more
TL;DR: In this article, a leak sensor powered by the circuit voltage being controlled by the vacuum circuit interrupter and continuously operating while the interrupters is in service is presented, which provides an indication of failure and corrective action to be taken in single phase or multi-phase circuits.
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Tomio Fukushima
TL;DR: In this paper, a monitoring device for monitoring vacuum pressure of an electrical device employing an evacuated envelope employing an electric field generating device of vacuum type, was presented, which includes a light source for generating light, electric field detector detecting change of the electric field of the generator due to the change of vacuum pressure inside the envelope, and photoelectric converter for converting the light controlled by the generator to an electric signal which is employed to monitor the vacuum pressure.
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