Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-05-26
1983-08-09
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340638, 340660, 361120, G08B 2100
Patent
active
043981879
ABSTRACT:
A pressure monitoring system for a high-voltage vacuum circuit interrupter including a plurality of capacitors connected in series located outside an evacuated housing and between two metallic end plates each attached to the electrode holder and an arc shielding member. The pressure monitoring system which monitors the deterioration of vacuum pressure within the evacuated housing of the interrupter by detecting the change in the electric field intensity of the capacitors dependent upon the change in vacuum pressure comprises a light source, at least one electric field detecting member having a Pockel's cell located on one of the capacitors, light receiving member and a vacuum pressure determining member, whereby an automatic monitoring of vacuum pressure within the evacuated housing of the vacuum circuit interrupter or within each of the evacuated envelopes of a plurality of vacuum circuit interrupters can be made.
REFERENCES:
patent: 3403297 (1968-09-01), Crouch
patent: 3594754 (1971-07-01), Voshall
patent: 3744045 (1973-07-01), Frink et al.
patent: 4034264 (1977-07-01), Muller et al.
patent: 4096366 (1978-06-01), Titus
patent: 4103291 (1978-06-01), Howe et al.
patent: 4163130 (1970-07-01), Kubota et al.
Fukushima Tomio
Tanigaki Shuzo
Brigance Gerald L.
Kabushiki Kaisha Meidensha
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