鉛ガラスファイバ型光CTを用いた光位相検出による電流差動保護演算システム

概要

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We propose an optical current sensing system which has a function of the differential electric current calculation being done in the protective relay equipment. In the proposed system a new scheme of common pass fiber-optic interferometer is formed. The interferometer is composed of the flint glass fiber as multiple Faraday sensing elements, quarter wave plates as polarization mode converters, and polarization maintaining fiber as signal transmission lines. By using this system, stable output proportional to the total value of current detected by the multiple sensing elements can be obtained. In order to confirm the principle, an experimental set up including three sensors was built and characteristics of the system were examined. From results of the experiment, it became clear that function of the experimental system agreed well with the principle. Following the successful experimental results, two basic model sensors for practical use were manufactured and were incorporated into the system. Good test results of the system with the model sensors were also obtained.
2003-03-01