不同配置形式倒T型布置绝缘子串直流冰闪特性研究  

DC Flashover Characteristics of the Iced-Covered Inverted T-Type Insulator Strings with Different Configuration

作　　者：黄亚飞 蒋兴良[1] 杨国林 朱梅林 陈宇 Huang Yafei;Jiang Xingliang;Yang Guolin;Zhu Meilin;Chen Yu(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工技术学报》2021年第24期5294-5303,共10页Transactions of China Electrotechnical Society

基　　金：国家电网公司总部科技资助项目(521999180006)。

摘　　要：倒T型布置方式能有效提高绝缘子串在污秽覆冰条件下的闪络电压,降低跳闸事故率,但对其在直流电压下的冰闪特性却缺乏研究。该文在人工气候室内模拟自然覆冰环境,以LXP−70绝缘子为试验对象,以110kV电压等级绝缘子串长为基准,开展倒T型布置绝缘子串的直流冰闪试验,得到不同覆冰度和污秽度下不同配置形式倒T型绝缘子串的直流冰闪特性。试验结果表明,与普通悬式绝缘子串相比,倒T型布置的绝缘子串的直流冰闪电压提高了5.40%~12.54%;倒T型绝缘子串的直流冰闪电压与等值冰厚及覆冰水电导率均呈负幂函数关系;倒T型绝缘子串的配置方式对其直流冰闪电压有着显著的影响。此外,该文得出不同污冰参数(ISP)下不同配置形式倒T型绝缘子串直流冰闪电压相对于普通悬垂串的提高比例,并通过临界泄漏电流分析了倒T型布置可以提高绝缘子串直流冰闪电压的原因。该文结论为不同污秽、覆冰地区输电线路设计提供了参考。The inverted T-type configuration can increase the flashover voltage of insulator strings under icing and contamination conditions.However,there are few studies on its DC icing flashover characteristics.In this paper,DC icing flashover tests are performed in artificial climate chamber.The DC icing flashover characteristics of different inverted T-type insulator strings are obtained under different ice and contamination conditions.The results show that the DC icing flashover voltage of the inverted T-type insulator string is increased by 5.40%~12.54%compared with the ordinary suspension insulator string.Meanwhile,the DC icing flashover voltage has a negative power function relationship with the equivalent ice thickness and the electric conductivity of icing water.And the configuration of the inverted T-type insulator string has a great effect on the DC icing flashover voltage.In the end,the relationship between the DC icing flashover voltage and the ice stress parameter is obtained.At the same time,the DC icing flashover voltage of the inverted T-type insulator string is analyzed by the critical leakage current.The conclusion of this paper provides a reference for the transmission line design in different icing and contamination areas.

关 键 词：架空输电线 绝缘子串 覆冰闪络 倒T型布置 

分 类 号：TM85[电气工程—高电压与绝缘技术]