処理中

しばらくお待ちください...

設定

設定

出願の表示

1. US20120262150 - Single-phase optical current transformer

官庁 アメリカ合衆国
出願番号 13517493
出願日 13.12.2010
公開番号 20120262150
公開日 18.10.2012
特許番号 08933686
特許付与日 13.01.2015
公報種別 B2
IPC
G01R 31/00
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
31電気的性質を試験するための装置;電気的故障の位置を示すための装置;試験対象に特徴のある電気的試験用の装置で,他に分類されないもの
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
CPC
G01R 15/246
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
15Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00 and G01R33/00 - G01R35/00
14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
24using light-modulating devices
245using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
246based on the Faraday, i.e. linear magneto-optic, effect
出願人 Zhang Wei
Hitachi, Ltd.
Yamaguchi Tatsushi
発明者 Zhang Wei
Yamaguchi Tatsushi
代理人 Crowell & Moring LLP
優先権情報 2009288765 21.12.2009 JP
発明の名称
(EN) Single-phase optical current transformer
要約
(EN)

An installation base is secured to part of outer peripheral surface of cylindrical container 1 which has electric conductor 2 arranged thereinside, and a case which stores a Faraday-effect element is detachably secured to the installation base. Faraday-effect element 10 having two optical fibers 24A, 24B of prescribed dimensions, to provide first and second optical paths 11A, 11B maintained in parallel with a predetermined interval therebetween and placed so as to intersect axial direction of electric conductor 2, and having mirror 12 which reflects linearly polarized light at one end surface of each optical fiber. Linearly polarized light from the same light source injected into each of the optical paths 11A, 11B, and current flowing in electric conductor 2 is measured base on the Faraday rotation angle of the linearly polarized light reflected and returned from mirror 12.