Vacuum switchgear

High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum

Reexamination Certificate

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Details

C218S136000

Reexamination Certificate

active

11079079

ABSTRACT:
A main circuit switching unit and an isolator are accommodated in a vacuum container. A first conductor and a main circuit conductor are arranged to extend in and out of the vacuum container. A movable electrode of the main circuit switching unit is connected to the first conductor through a first flexible conductor, and a movable electrode of the isolator is connected to the main circuit conductor through a second flexible conductor. A shield is arranged around the first conductor and the main circuit conductor. Another shield is arranged around a connecting portion between the first flexible conductor and the movable electrode of the main circuit switching unit. A still another shield is arranged around the isolator. A further another shield is arranged around the second flexible conductor. These shields are secured to the vacuum container through insulating spacers. This arrangement instantly eliminates a dielectric breakdown phenomenon that occurs at electric field concentrated regions by the shields to prevent a dielectric breakdown caused by particulate foreign matters and thereby improve an insulation reliability of the devices.

REFERENCES:
patent: 6144005 (2000-11-01), Tinimizu et al.
patent: 6153846 (2000-11-01), Morita et al.
patent: 6335502 (2002-01-01), Kikukawa et al.
patent: 6426627 (2002-07-01), Kikukawa et al.
patent: 6498314 (2002-12-01), Miyo et al.
patent: 6855903 (2005-02-01), Kikukawa et al.
patent: 7135652 (2006-11-01), Kobayashi et al.
patent: 1381064 (2004-01-01), None
patent: 2001-176364 (2001-08-01), None
patent: 2001-307603 (2001-11-01), None
patent: 2001-346306 (2001-12-01), None
Patent Abstracts of Japan for JP-2001-346306.
Patent Abstracts of Japan of JP-2001-307603.
Patent Abstracts of Japan for JP 2001-176364.

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