摘要
输配电外绝缘污秽闪络仍然是威胁电网安全运行的重要隐患,目前国内外对于污闪机理的研究仍在开展。通过人工污秽试验研究了瓷绝缘子交流闪络特性,根据拍摄到的闪络过程,研究了绝缘子表面电弧发展规律。继而开展了瓷材料平板模型沿面闪络试验,获取了电弧延伸过程,测得了伏安特性并且计算电弧常数。研究结果表明,交流电压下瓷绝缘子表面电弧发展具有随机性,除了明显延伸的局部电弧之外,其表面还有多处火花放电;导电物种类对瓷表面电弧发展过程有影响,氯化钠下污秽瓷表面的局部电弧伏安特性可用U=112.8 I-0.54表示,而硫酸钙下污秽瓷表面为U=163I-0.39;根据临界闪络理论,瓷绝缘子闪络的污秽影响特征指数与沿面电弧常数之间存在数学关系,且该关系与所得的试验结果基本一致。
Pollution flashover accidents in power transmission lines＇ external insulation are still threatening the safety operation of power grid. Currently relevant researches on flashover mechanism are undergoing. The AC flashover performance of ceramic insulator is firstly obtained through artificial experiments, and then based on the recordings of flashover process, the rule of arc propagation on insulator surface is analyzed. Besides, a plane model is used and the arc propagating performance on it is tested, as well as measuring the volt-ampere characteristics of ceramic surface partial arc, calculating the arc constants. Research results indicate that, arc development on ceramic insulator surface is random, and except obvious elongating particle arc, there are many sparking points. Conductive materials have effects on arc propagation along ceramic surface, and the volt-ampere characteristic of ceramic surface arc under Na Cl can be expressed using U=56.79 I-0.56, while under Ca SO4 is U=59.07I-0.6.According to the critical flashover theory, the ESDD（equivalent salt deposit density） influencing exponent of ceramic insulator pollution flashover has something to do with arc constant, and this is then verified by the experiment results. This study can provide reference for the in-depth research on pollution flashover performance, as well as for the optimization of pollution flashover model.
出处
《电瓷避雷器》
CAS
北大核心
2016年第3期37-41,共5页
Insulators and Surge Arresters
关键词
绝缘子
污秽闪络
电弧
导电物质
平板模型
insulator
pollution flashover
arc propagation
conductive material
plane model
