CAJ | 학술논문

为了研究高海拔地区伞伸出对复合支柱绝缘子直流污闪电压的影响规律，选取一大一小和一大两小两种伞形结构的10种伞伸出参数复合支柱绝缘子，在海拔2100 m的条件下，采用恒压升降法进行人工污秽试验，研究伞伸出参数对复合支柱绝缘子污闪电压的影响，同时测量了试品单元伞裙表面电阻在雾室随时间的变化，用紫外放电仪和高速摄像机观测试品的临闪前局部放电和沿面电弧发展。研究结果表明：试品污闪电压值随着平均伞伸出增大存在最大值，提出了平均伞伸出与污闪电压值的二次函数关系；由于绝缘子表面电阻随着伞伸出的增大而减小，临闪前局部放电现象趋于明显，表面电弧桥接概率加大，电弧“飘弧”现象严重，大大降低了爬距利用率，导致污闪电压值下降。
위료연구고해발지구산신출대복합지주절연자직류오섬전압적영향규률，선취일대일소화일대량소량충산형결구적10충산신출삼수복합지주절연자，재해발2100 m적조건하，채용항압승강법진행인공오예시험，연구산신출삼수대복합지주절연자오섬전압적영향，동시측량료시품단원산군표면전조재무실수시간적변화，용자외방전의화고속섭상궤관측시품적림섬전국부방전화연면전호발전。연구결과표명：시품오섬전압치수착평균산신출증대존재최대치，제출료평균산신출여오섬전압치적이차함수관계；유우절연자표면전조수착산신출적증대이감소，림섬전국부방전현상추우명현，표면전호교접개솔가대，전호“표호”현상엄중，대대강저료파거이용솔，도치오섬전압치하강。
To investigate the influence of shed overhang of post composite insulators on flashover performance at high altitude, artificial pollution tests on 10 types of post composite insulators with different shed overhangs were carried out at high altitude area (2100m); the surface resistance of one shed unit was measured, and the ultra violet(UV)camera and the high speed camera Phantom were used to observe the partial discharge before flashover and the development of arcs on the insulator surface. The results show that, with the increase of shed overhang, the flashover voltage increases at the beginning and then decreases; the relationship between the average shed overhang and the flashover voltage was proved approximate quadratic function. Moreover, with the increase of shed overhang, the surface resistance also decreases in the fog chamber, and the partial discharge phenomenon tend to be much more intensely, the arc on the surface became much more easily bridges the sheds in the process of flashover, and this leading to decline the utilization rate of creepage distance, so the flashover voltage decreased.