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Patent Searching and Data


Title:
真空スイッチギヤ
Document Type and Number:
Japanese Patent JP4403782
Kind Code:
B2
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.

Inventors:
Tomoaki Utsumi
Kazuhiro Sato
Takashi Shirane
Kenji Tsuchiya
Masato Kobayashi
Application Number:
JP2003386385A
Publication Date:
January 27, 2010
Filing Date:
November 17, 2003
Export Citation:
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Assignee:
株式会社日立製作所
International Classes:
H01H33/66; H02B13/055; H01B1/00; H01H31/00; H01H33/662; H01H33/666; H02B13/02; H05K5/00; H05K9/00; H01H1/58; H01H33/02
Domestic Patent References:
JP55141023A
JP11283473A
JP2000268685A
JP2000294088A
JP2001307603A
JP2002245906A
Foreign References:
WO2000069041A1
Attorney, Agent or Firm:
Hirotsugu Yoshioka