Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1989-06-02
1991-09-03
Scott, J. R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144AP, 200148B, H01H 3324, H01H 3132
Patent
active
050456520
ABSTRACT:
A disconnector for a gas insulated switchgear in which the disconnector includes, in a metallic container filled with an insulated gas, a stationary electrode having a contact, a stationary electrode shield electrically connected to the stationary electrode to surround the contact, the stationary electrode shield made of an electrically resistant material and having a free end portion and inner and outer surfaces, and a movable electrode arranged to face the contact and being movable into and out of electrical contact with the contact, and in which the stationary electrode shield is arranged to flow discharging current therethrough due to an interelectrode voltage applied between the stationary electrode and the movable electrode. The disconnector includes an annular metallic electrode coaxially mounted on the free end portion of the stationary electrode shield so as to allow the movable electrode to pass therethrough. The metallic electrode has an exposed surface exposed to the insulated gas and the exposed surface of the metallic electrode is adapted to be larger in field strength than the inner and outer surfaces of the stationary electrode shield for producing the discharge between the exposed surface of the metallic electrode and the movable electrode.
REFERENCES:
patent: 2978560 (1961-04-01), Bates et al.
patent: 4403125 (1983-09-01), Yamaoka et al.
patent: 4500762 (1985-02-01), Yoshizumi
patent: 4748303 (1988-05-01), Kieffer
Aoyagi Hirokuni
Ishikawa Masayuki
Nishiwaki Susumu
Yanabu Satoru
Kabushiki Kaisha Toshiba
Scott J. R.
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