Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1988-11-04
1990-06-26
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 2, 200144B, H07H 314
Patent
active
049376985
ABSTRACT:
A system for foreseeing deterioration in interrupting a performance of a vacuum interrupter, including a first measuring component for measuring potentials of electric lines connected to fixed and movable electrodes of the vacuum interrupter; a second measuring component for measuring a potential of an arc shield; a signal transmitting section for the transmission of potential signals resulting from the measurements in the first and second measuring component; a comparing section for making a comparison between the measured signal from the first measuring component and the measured signal from the second measuring component both transmitted through the signal transmitting section; and a judging section for judging that the fixed and movable electrodes have been deteriorated in their interrupting performance, on the basis of the result of the comparison made in the comparing section.
REFERENCES:
patent: 4471309 (1984-09-01), Lange et al.
patent: 4578730 (1986-03-01), Takuyama et al.
patent: 4791518 (1988-12-01), Fischer
patent: 4797522 (1989-01-01), Voshell
Hayashi Tatsuya
Toya Hideaki
Jennings Derek S.
Mitsubishi Denki & Kabushiki Kaisha
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