Interferometric Fiber-Optic Electric Current Sensor for Railway Power Systems

カテゴリ: 論文誌(論文単位)

グループ名: 【E】センサ・マイクロマシン部門

発行日: 2013/02/01

タイトル(英語): Interferometric Fiber-Optic Electric Current Sensor for Railway Power Systems

著者名: Tatsuya Kumagai (Hitachi Cable, Ltd.), Wataru Ohnuki (Hitachi Cable, Ltd.), Hitoshi Hayashiya (East Japan Railway Company), Kouji Nishida (Eiraku Electric Co., Ltd.)

著者名(英語): Tatsuya Kumagai (Hitachi Cable, Ltd.), Wataru Ohnuki (Hitachi Cable, Ltd.), Hitoshi Hayashiya (East Japan Railway Company), Kouji Nishida (Eiraku Electric Co., Ltd.)

キーワード: Sagnac interferometer，Faraday effect，fiber-optic current sensor，polarization-maintaining fiber，railway power system

要約(英語): The sensing principle of fiber-optic electric current sensors is based on the Faraday effect. Electric current flowing in a conductor induces a magnetic field, which rotates the plane of polarization of the light traveling in a sensing path encircling the conductor. There are two types of sensing techniques. One is a polarimetric-type measuring the polarization direction change, the other is an interferometric-type detecting the phase difference between counter-propagating circular-polarization lights through a sensing fiber loop. An all-fiber Sagnac interferometer-type fiber-optic electric current sensor was developed and successfully tested. The advantages of this sensor are its performance and light structure, ease of handling, and robustness to an external magnetic field caused by an adjacent electric current. The basic characteristics of the fiber-optic current sensor were compared with those of conventional Hall effect current sensors. The fiber-optic current sensor showed sufficient response less than 1 ms and resolution of 10 A for practical application in a short circuit test, and its strong robustness to an external magnetic field was shown experimentally. The sensor was tested in a possible future measurement and protection applications in railway power systems. The field test configurations and results are described.

本誌: 電気学会論文誌E（センサ・マイクロマシン部門誌） Vol.133 No.2 （2013）

本誌掲載ページ: 42-47 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejsmas/133/2/133_42/_article/-char/ja/