Method and apparatus for detecting a reduction in the degree of

Details Method and apparatus for detecting a reduction in the degree of Method and apparatus for detecting a reduction in the degree of

1993-03-26

1995-03-21

Wieder, Kenneth A.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

200144B, 361129, 324460, 324409, G01R 3102, H01H 3326

Patent

active

053999738

ABSTRACT:
An improved vacuum valve including an insulating container and an arc shield held in the insulating container, wherein a protrusion is formed on either the outer cylindrical surface of the arc shield or on the inner surface of the container. A detecting electrode is set confronted with the outer surface of the insulating container with an air gap therebetween, and is grounded through a current sensor. The current sensor detects a discharge current which is induced through the protrusion when the degree of vacuum of the vacuum valve is reduced, to output a detection signal. In response to the detection signal, a signal processing unit outputs an alarm signal indicating the reduction in the degree of vacuum of the vacuum valve. Thus, while the vacuum valve is in operation, its vacuum reduction can be positively detected with the vacuum valve maintained unchanged in reliability.

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patent: 4896008 (1990-01-01), Aoki et al.
patent: 4937698 (1990-06-01), Toya et al.
"Partial Discharge Measurement General", Electric Society, Electric Standard Investigative Committee Standard, JEC-195, pp. 1, 4 & 24, 1980.
Patent Abstracts of Japan, Vacuum Pressure Measuring Device For Vacuum Circuit Breaker Vacuum Bulb, Y. Kogushi, Aug. 24, 1992, vol. 16/No. 397.
Patent Abstracts of Japan, Inspecting Device For Degree of Vacuum of Vacuum Breaker, T. Takashima, Sep. 20, 1983, vol. 7/No. 212.

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