CAJ | 학술논문

　　直流支柱绝缘子污闪问题比交流支柱绝缘子要严重，通过伞裙优化能够明显改善其污闪特性。该文借鉴人工污秽试验研究伞裙优化的成果，利用有限元法对染污直流支柱绝缘子建模，研究伞间距、大伞伸出和大小伞伸出差对绝缘子沿面电场分布的影响。提出以爬电距离和电场强度作为伞裙参数优化的判断依据，研究表明，电场强度分布随着伞裙参数的变化呈有规律变化：随着伞间距的增加，绝缘子沿面平均电场强度逐渐减小；随着大伞伸出的增加，绝缘子沿面平均电场强度逐渐增大；随大小伞伸出差增加，爬电系数单调减小，沿面平均电场强度呈振荡减小的趋势。通过比较分析得出支柱绝缘子伞裙较优的参数范围，为进行伞裙优化试验研究提出试品伞裙的建议参数。
　　직류지주절연자오섬문제비교류지주절연자요엄중，통과산군우화능구명현개선기오섬특성。해문차감인공오예시험연구산군우화적성과，이용유한원법대염오직류지주절연자건모，연구산간거、대산신출화대소산신출차대절연자연면전장분포적영향。제출이파전거리화전장강도작위산군삼수우화적판단의거，연구표명，전장강도분포수착산군삼수적변화정유규률변화：수착산간거적증가，절연자연면평균전장강도축점감소；수착대산신출적증가，절연자연면평균전장강도축점증대；수대소산신출차증가，파전계수단조감소，연면평균전장강도정진탕감소적추세。통과비교분석득출지주절연자산군교우적삼수범위，위진행산군우화시험연구제출시품산군적건의삼수。
The pollution flashover problem of DC post insulators is much more serious than that of AC post insulators. Sheds optimization can ameliorate the pollution flashover characteristic of DC post insulators. Based on the sheds optimization result of artificial pollution tests, this paper established polluted post insulators by finite element method and studied the electric field distribution along polluted insulators influenced by spacing between large sheds, overhang of the large shed and difference between overhangs of the large shed and small shed. The creepage distance and electric field were put forwards as the criterion to optimize the parameters of sheds. The results show that, as the spacing between large sheds increases, the average electric field of post insulators decreases gradually;as the overhang of the large shed increases, the average electric field of post insulators increase by degrees;as the difference between overhangs of the large shed and small shed increases, the creepage coefficient decreases monotonously, and the average electric field of post insulators is reduced and oscillated. Finally, advice parameters for follow-up researches on shed profile optimization of DC post insulators were put forwards.