PROBLEM TO BE SOLVED: To provide a single-phase optical current transformer that can reliably conduct the measurement of a large current, can be made compact and be economically manufactured, and facilitates assembly work.

SOLUTION: A mounting seat is fitted onto a part of outer circumference of a cylindrical container 1 wherein an energizing conductor 2 is arranged inside, and a case housing a Faraday effect member is fixed at the mounting seat, removably. The Faraday effect member 10 uses two optical fibers 24A and 24B having specified size wherein first and second optical paths 11A and 11B crossing almost orthogonally the energizing conductor 2 are provided parallel to each other at a predetermined spacing, and mirrors 12 are provided at one end face of each of the optical fibers to reflect linear polarization light. The linear polarization light emitted from the same light source is put into the first and second optical paths 11A and 11B, respectively, and it is reflected on the mirror 12, and then the Faraday rotation angle of the reciprocating linear polarization light is used to measure current flowing in the energizing conductor 2.

COPYRIGHT: (C)2011,JPO&INPIT

【課題】大電流の測定を確実に行え、小型化できて経済的に製作することができ、また組立作業も容易な単相用光変流器を提供する。
【解決手段】内部に通電導体２を配置する円筒状容器１の外周面の一部に取付座を固着し、この取付座にファラデー効果部材を収納するケースを着脱自在に固定している。ファラデー効果部材１０は、所定寸法の２本の光ファイバー２４Ａ、２４Ｂを用いて通電導体２と略直交する第１及び第２の光路１１Ａ、１１Ｂを予め定めた間隔で平行に設けると共に、各光ファイバーの一端面に直線偏波光を反射させる鏡面１２を設けて構成している。第１及び第２の光路１１Ａ、１１Ｂにそれぞれ同一光源からの直線偏波光を入射させ、鏡面１２で反射して往復する直線偏波光のファラデー回転角により、通電導体２を流れる電流を測定する。
【選択図】図１