低気圧空気中の繰返し放電による50%フラッシオーバ電圧の変化と陰極表面上の生成物

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書誌事項

タイトル別名
  • Changes of 50% Flashover Voltage and Compounds Produced on the Cathode Surface by Discharges Repeated in Low Pressure Air
  • テイキアツ クウキチュウ ノ クリカエシ ホウデン ニ ヨル 50パーセント
公開日
1991
DOI
  • 10.1541/ieejfms1990.111.7_643
公開者
一般社団法人 電気学会

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説明

A lightning impulse voltage is applied repeatedly 10, 000 times to an electrode system of positive point to plane and two electrode systems of positive point to plane which has installed a protrusion in low pressure air of 8Torr. The flashaver voltages where the rate of arc occurrence times to discharge times is 50% (henceforth, call 50% flashover voltage, VA50) are examined. Moreover, effects of the increase of the discharge times on changes of the VA50 in the range of 0.1-30Torr and the protrusion surface forming a part of the cathode surface are examined, and the change of the protrusion surface is observed and analyzed by an electron probe micro-analyzer and a x-ray photoelectron spectroscope.<br>The main results are as follows.<br>(1) Even in the case that the 50% flashover voltage of the electrode system rised and saturated in the relatively little discharge times, when the discharge times were increased further, the 50% flashover voltage became higher and again saturated, depending on the electrode system geometry and the oxidation of the cathode surface.<br>(2) The 50% flashover voltages became higher in the vicinity of 8Torr in which the voltage was applied so many times, and the curves of the VA50 to the air pressures of 0.1-30Torr before and after the many discharges differed.<br>(3) After a number of discharges, CuO and Cu2O were formed and the adsorptive oxygen molecule or moisture appeared on the copper cathode surface, and as a result the 50% flashover voltage became higher.

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