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1. EP2518516 - SINGLE-PHASE OPTICAL CURRENT TRANSFORMER

注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

[ EN ]
Claims

1. A single-phase optical current transformer comprising:

a cylindrical container;

an electric conductor being arranged inside the cylindrical container;

a Faraday-effect element being provided on the cylindrical container, the Faraday-effect element forming an optical path for linearly polarized light to measure electrical current flowing through the electric conductor based on the Faraday rotation angle of the linearly polarized light that passes through the optical path;

the Faraday-effect element having two optical fibers of prescribed dimensions and mirrors, each of the optical fiber forming a first optical path and a second optical path respectively, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, each of the optical paths being maintained parallel to each other at a predetermined interval, each of the mirror being provided at the one end surface of the each optical fiber respectively, each of the mirror reflecting the linearly polarized light,

wherein each of the linearly polarized lights from the same light source are injected into each of the optical path respectively, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angle of the linearly polarized light which is reflected from the mirror.


  2. A single-phase optical current transformer comprising:

a cylindrical container;

an electric conductor being arranged inside the cylindrical container;

a Faraday-effect element being provided on the cylindrical container, the Faraday-effect element forming an optical path for linearly polarized light to measure electrical current flowing through the electric conductor based on the Faraday rotation angle of the linearly polarized light that passes through the optical path;

an installation base being secured to a part of the outer peripheral surface of the cylindrical container;

a case being detachably secured to the installation base, the case storing the Faraday-effect element therein;

the Faraday-effect element having two optical fibers of prescribed dimensions and mirrors, each of the optical fiber forming a first optical path and a second optical path respectively, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, each of the optical paths being maintained parallel to each other at a predetermined interval, each of the mirror being provided at the one end surface of the each optical fiber respectively, each of the mirror reflecting the linearly polarized light,

wherein each of the linearly polarized lights from the same light source are injected into each of the optical path respectively, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angle of the linearly polarized light which is reflected from the mirror.


  3. The single-phase optical current transformer according to claim 2, wherein a position fixing base is arranged inside the case and each of the optical fibers is arranged on the position fixing base with a protecting tube applied thereon.