液体誘電体中の不平等電界測定装置の解析と検討

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  • Analysis and Discussion on the Two-Dimensional
  • エキタイ ユウデンタイチュウ ノ フビョウドウ デンカイ ソクテイ ソウチ ノ

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On the basis of the electrooptic Kerr effect, a highly sensitive new measurement system of two-dimensional electric field distribution, the field intensity Edc and its direction WdC, in dielectric liquids is developed. The system can automatically measure the electric field intensity of 100V/cm at minimum and the algle of it's direction within 1.0 degrees in the transformer insulating oil. For obtaining the highly sensitive measurement of electric field insensity even when using short electrodes of below 10cm in length in the transformer oil, we use elliptically polarized incident light (phase difference is about 8 degrees) and a modulating electric field (the frequency is 10kHz) superimposing the static electric stress. Furthermore, for determining the angle of the electric field direction, a test cell containing the dielectric liquids is placed between two optical phase modulators of a Pockels device.<br>This optical system for measurement of two-dimensional electric field consists of a He-Ne Laser light source, polarizer, lst opical modulator, test cell, 2nd optical modulator, analyzer and photodetector. The light intensity passed through this optical system was analyzed by calculating Jones'matrix. This paper also discusses the detemination of the optimum fast axis and the phase difference of optical modulators. We demonstrate the two-dimensional lectrical field distribution in the test sample of tricresylephosphate liquid under dc and ac electric field applications.

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