報告書番号

W98009

タイトル（和文）

光応用電界計測法の開発と放電現象解析への適用検討

タイトル（英文）

Development of New Optical Electric Field Sensor and Application to Discharge Measurement

概要 （図表や脚注は「報告書全文」に掲載しております）

電力機器の絶縁はより厳しい電界、温度条件にさらされる傾向にあり、放電などの非線形現象をも考慮した設計が求められる。そのためには電界計算のみならず実際に直接測定を行った上での現象解析が必要となる。放電現象の解析には空間の電界情報が大きな手がかりとなるが、直接電位差測定法などの従来の電気的手法では高電圧活線状態での電界強度測定は不可能であった。これに対して進歩の著しい光エレクトロニクス技術を応用した高性能電界センサなら十分な可能性があるので、高電圧、高電界領域の空間電界計測を念頭に置いた新型光応用電界センサの開発を行った。また開発されたセンサを用いて非線形放電現象の解析への適用を試み、有効であることを確認した。

概要 （英文）

Electric power apparatus is operated with more severe electrical and thermal condition recently. For its optimal design not only electric field calculation but also direct measurement of non-linear electrical phenomena, such as discharges, are required. Information of electric fields in discharge space is greatly helpful for the analysis, but direct measurement in high electric field area is difficult with conventional method. On the other hand there is possibility with optical method developed in recent years. In this paper an optical waveguide electric field sensor by using Pockels device is developed. From a view point of spatial resolution and distortion optical waveguide technique is successfully introduced and its dimension come to be smallest class in the world. Calibration of Pockels sensor is examined in non-uniform field with or without space charges. It shows better performance than that developed before. This is very important characteristic in discharge measurement because discharge space is non-uniform. By Pockels sensor corona discharge is measured. With cylinder-plane electrode system the sensor is set on the surface of cylindrical electrode and high voltage is applied. The electric field on the surface of the electrode is restricted to about 30kV/cm after corona inception. Waveforms of positive and negative discharge are observed precisely in this experiment. It is shown that the Pockels sensor is suitable for discharge measurement.

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