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Patent Searching and Data


Title:
ON-LOAD TAP CHANGER
Document Type and Number:
Japanese Patent JP2009277869
Kind Code:
A
Abstract:

To provide an on-load tap changer which suitably control opening/closing operation of a contact and eliminates a fault caused by sludge production.

The on-load tap changer includes a container 23 filled with insulating oil and a changeover opening/closing unit 22 arranged at the container 23. The changeover opening/closing unit 22 has a contact 60 where a load current flows, and makes and breaks the contact 60. The changeover opening/closing unit 22 further has a movable portion 67 which rotates as the contact 60 is made and broken and a dummy metal portion 71 fixed to the movable portion 67. The dummy metal portion 71 is formed of a metal material which reacts with a sulfur compound contained in the insulating oil, and captures a sulfide produced through the reaction.


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Inventors:
MINAGAWA KAZUSHI
Application Number:
JP2008127351A
Publication Date:
November 26, 2009
Filing Date:
May 14, 2008
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H01F29/04
Domestic Patent References:
JPH0250405A1990-02-20
JPS57193219A1982-11-27
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Nobuo Arakawa