光空間伝送部を有する光電流変成器の開発

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  • Development of Optical Current Transformers with the Portions of Free Gas Space Propagation of Light
  • ヒカリ クウカン デンソウブ オ ユウスル コウデンリュウ ヘンセイキ ノ カ

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Recently, Optical current and voltage measuring systems based on measuring principles different from those of traditional apparatus have been developed actively. This paper deals with the development of an optical current transformer (CT), whose optical signal transmission system has some portions of free space light propagation, for its application to gas insulated switchgear (GIS).<br>The analyses of free space light propagation through plano-convex lenses or micro-lenses were carried out firstly and compared with the measured values. Then, the piano-convex lens system was confirmed to be preferable to long distance light transmission in free space. Using an optical CT with the piano-convex lens system, optical loss distribution in the light transmission system was investigated, and total optical loss of less than 20 dB was obtained. Finally, an optical CT system with light transmission in SF6 gas space was developed and incorporated into a full-scale 77 kV GIS model. Test results for the optical CT system showed that it has excellent measuring characteristics conformed with JEC 1201. No variation of current measuring characteristics was observed during long-term field tests.

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