強磁界下でのポリフェニレンオキサイドの絶縁破壊に及ぼすγ線照射の影響
2002 年 51 巻 8 号 p. 301-306
詳細
2002 年 51 巻 8 号 p. 301-306
The spreading use of organic insulating materials in environments such as space and nuclear power stations increases the concern about the reliability of electrical insulation in these environments due to radiation and magnetic field effects on the surface breakdown of polymers. The experiment was carried out by DC impulse voltage under 495 mT.Polyphenylene oxide, which was irradiated in air up to 100 kGy and 1 MGy with dose rate of 10 kGy/h using a 60Co gamma-source, has been used as the test sample. The total dose of gamma-ray irradiation effects on the discharge quantity have been studied The changes of discharge quantity are discussed with applied magnetic field under 495 mT and the frequency of applied impulse voltage in the range from 100 Hz to 150 Hz. The discharge quantity increased with increasing the total dose of gamma-ray irradiation, and decreased with applied magnetic filed. The discharge quantity increased with increasing the frequency of applied impulse voltage.
