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1. IN5405/DELNP/2012 - SINGLE PHASE OPTICAL CURRENT TRANSFORMER

官庁 インド
出願番号 5405/DELNP/2012
出願日 18.06.2012
公開番号 5405/DELNP/2012
公開日 07.03.2014
公報種別 A
IPC
G01R 15/24
G物理学
01測定;試験
R電気的変量の測定;磁気的変量の測定
15グループG01R17/00~G01R29/00,G01R33/00~G01R33/26またはG01R35/00に定めた形式の測定装置の細部
14電圧または電流の絶縁計測に適合するもの,例.高電圧回路または大電流回路用
24光変調器を使用するもの
出願人 HITACHI LTD.
TOKO ELECTRIC CORPORATION
優先権情報 2009288765 21.12.2009 JP
発明の名称
(EN) SINGLE PHASE OPTICAL CURRENT TRANSFORMER
要約
(EN)
Provided is a single phase optical current transformer which reliably measures large electrical currents can be economically manufactured in a compact size and has a simple assembly operation. An installation base is securely attached to part of the outer peripheral surface of a cylindrical container (1) which has an electrical conductive body (2) arranged thereinside and a case which stores a Faraday effect member is detachably secured to the installation base. The Faraday effect member (10) is constructed by using two optical fibers (24A 24B) having prescribed dimensions to provide first and second optical paths (11A 11B) maintained in parallel with a predetermined interval therebetween and arranged so as to intersect the axial direction of the electrical conductive body (2) and by providing a mirror surface (12) which reflects linearly polarized light at one end surface of each optical fiber. Linearly polarized light from the same light source falls incident on each of the first and the second optical paths (11A 11B) and current flowing in the electrical conductive body (2) is measured from the Faraday rotation angle of the linearly polarized light reflected and returned by the mirror surface (12).