淀粉改性聚丙烯耐电弧特性的研究

Arc Resistance of Amylum Modified Polypropylene

为开发生物降解新生绝缘材料以应对石油化工产品的有机绝缘材料废弃后带来的严重环境污染,采用高压小电流耐电弧实验测试了不同环境下淀粉改性聚丙烯的绝缘特性。结果表明,淀粉改性聚丙烯的耐电弧性随电场强度、脉冲放电间隔和试验气压而变化,磁场中淀粉改性聚丙烯的耐电弧性随磁场与电场的相对夹角而变化,相同环境下淀粉改性聚丙烯的耐电弧性强于普通聚丙烯。

In order to develop the biodegradable insulation material, modified polypropylene by amylum was used in this paper to investigate the effects of atmospheric pressure and magnetic field on arc resistance characteristic. A needle electrode system was used and the distance between the electrodes was 3 mm, 5mm and 7mm. Experiments were carried out under pulse voltage with a discharge interval rang from 4. 3 ms to 10 ms. The magnetic flux density was made from 120 mT to 180 mT and the angle between the magnetic field and the electric field was 90° and 270°. The test sample was placed in a decompression chamber, which was made of glass vessel, and the atmospheric pressure was reduced by a rotary pump to 75 kPa, 50 kPa and 25 kPa. The experiment phenomenon was observed by using a monocular video-zoom-microscope and the erosion depth was measured. Obtained results reveal that with increase of the electrode distance and discharge interval, the erosion depth of modified polypropylene decreases, and the erosion depth of modified polypropylene increases with increase of the atmospheric pressure. With increase of the magnetic flux density, the erosion depth decreases when the angle between magnetic field and electric filed is 90° but increases when the angle is 270°. Under the same conditions, the arc resistance of modified polypropylene is superior to that of polypropylene.