High-potential testing of vacuum-type circuit interrupters

Details High-potential testing of vacuum-type circuit interrupters High-potential testing of vacuum-type circuit interrupters

1979-11-05

1982-09-28

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 3366

Patent

active

043519920

ABSTRACT:
This method assures that when a vacuum interrupter having its interior at atmospheric pressure is tested by a high potential applied across its contacts, a spark-over will occur internally of the interrupter even though the high potential used has a lower effective value than the minimum needed to consistently produce a spark-over between the fully-separated contacts of the interrupter when the interrupter is at atmospheric pressure. Spaced metallic parts are provided within the interrupter, and these parts are of a metal characterized by higher dielectric strength in a vacuum than the metal used for the opposing regions of the contacts. The minimum gap between the spaced metallic parts is made shorter than the gap between the fully-separated contacts of the interrupter but yet is sufficiently long so that under normal vacuum conditions, it is less susceptible to spark-over than the gap between the fully-separated contacts.

REFERENCES:
patent: 3038980 (1962-06-01), Lee
patent: 3263162 (1966-07-01), Lucek et al.
patent: 3403297 (1968-09-01), Crouch
patent: 3508021 (1970-04-01), Bellis
patent: 3668350 (1972-06-01), Takeuchi et al.
patent: 4039792 (1977-08-01), Crouch et al.
patent: 4096366 (1978-06-01), Titus
patent: 4103291 (1978-07-01), Howe et al.
patent: 4163130 (1979-07-01), Kubota et al.

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