覆冰绝缘子直流电弧运动特性及燃弧时间的影响因素  

DC-arc Motion Characteristics and Influencing Factors of Arcing-time on Ice-covered Outdoor Insulators

作　　者：刘勇 李超 辛岳芃 尹芳辉 杜伯学 Masoud Farzaneh LIU Yong;LI Chao;XIN Yuepeng;YIN Fanghui;DU Boxue;Masoud Farzaneh(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China;University of Quebec at Chicoutimi,QC G7H2B1,Canada)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]清华大学深圳国际研究生院,深圳518055 [3]魁北克大学席库提米分校,加拿大QC G7H2B1

出　　处：《高电压技术》2024年第9期4222-4231,共10页High Voltage Engineering

基　　金：国家自然科学基金(51677128,52077119)。

摘　　要：为提高覆冰绝缘子闪络风险预测技术,分析了高压悬式覆冰绝缘子直流电弧运动特性及影响燃弧时间的因素。对直流覆冰闪络试验各阶段的泄漏电流和电弧动态特性进行了协同分析,深入研究了正、负直流电压下电弧动态行为差异。分析了燃弧时间与电弧特征量、泄漏电流的相关性,并建立了针对燃弧时间的多元拟合模型。结果表明:泄漏电流和电弧长度的变化可有效区分电弧发展阶段,其中负直流电压下的电弧产生频繁,初始局部电弧分布密集,持续时间短。直流电弧延伸时产生的新放电路径导致接触型和非接触型2种电弧衰减方式,且不同极性电压下新放电路径的发展方向相反。此外,直流电弧持续期间的累积电荷量、长度平均值与燃弧时间显著正相关,且负直流电弧长度平均值的数据离散度与电荷累积量分布范围更低,建立的多变量拟合方程对电弧持续时间的预测精度更高。To enhance the prediction technology for flashover risk in ice-covered insulators,we analyzed the motion characteristics of DC arcs on high voltage suspended ice-covered insulators and investigated the factors influencing arc duration by using DC icing flashover tests.Firstly,the leakage current and arc dynamic characteristics of DC icing flash-over test were analyzed cooperatively,and the difference of arc dynamic behavior under positive and negative DC voltage was studied in detail.Then,the correlation between arc time and arc characteristics and leakage current was analyzed,and a multivariate fitting model for arc time was established.The results show that the changes of leakage current and arc length can effectively distinguish the arc development stage,in which the arc under negative DC voltage produces fre-quently,the initial local arc is densely distributed and the duration is short.The new discharge path generated by DC arc extension leads to contact and non-contact arc attenuation,and the development direction of the new discharge path is oppo-site under different polarity voltages.In addition,the cumulative charge and the average length of the DC arc are positively correlated with the arc time.The distribution ranges of data dispersion and charge accumulation of the average negative DC arc length are lower,and the established multivariable fitting equation has higher prediction accuracy for arc duration.

关 键 词：覆冰绝缘子 直流电弧 运动机理 泄漏电流 燃弧时间 

分 类 号：TM216[一般工业技术—材料科学与工程]