The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2012
Filed:
Dec. 09, 2008
Takuya Kurogi, Hitachi, JP;
Kenji Tsuchiya, Hitachi, JP;
Naoki Nakatsugawa, Hitachinaka, JP;
Takumi Ishikawa, Hitachi, JP;
Nobuyuki Yamada, Tokyo, JP;
Takuya Kurogi, Hitachi, JP;
Kenji Tsuchiya, Hitachi, JP;
Naoki Nakatsugawa, Hitachinaka, JP;
Takumi Ishikawa, Hitachi, JP;
Nobuyuki Yamada, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A switchgear case is partitioned into a high voltage bus bar chamber, which contains bus bars and cable heads, a high voltage device chamber containing circuit breakers and operation mechanisms and a low voltage control chamber containing a relay and measurement devices, etc. A rear wall of the case has a first suction port disposed at a lower part thereof, wherein the high voltage bus bar chamber, high voltage device chamber and the low voltage control chamber are communicated and air passing through the chambers is discharged from a first discharging port of the casing. The bus bars electrically connecting the high voltage devices in the high voltage device chamber and connecting bars connecting the adjoining bus bars and the cable heads are covered with solid insulators for solid-insulation.