紧凑型多腔室并联间隙雷电冲击闪络路径约束研究  

Research on Lightning Flashover Path Constraints of Compact Multi-Chamber Parallel Gap

作　　者：袁涛[1] 左思家 司马文霞[1] 杨泽文 浦仕遵 Yuan Tao;Zuo Sijia;Sima Wenxia;Yang Zewen;Pu Shizun(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China;Dehong Power Supply Bureau of Yunnan Power Grid Corporation,Dehong 678400 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 [2]云南电网有限责任公司德宏供电局,德宏678400

出　　处：《电工技术学报》2023年第11期2989-2998,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777020)。

摘　　要：由于多腔室并联间隙构型特殊,不同于常规并联间隙,其雷电冲击闪络路径复杂,当放电间隙设置不当时会出现闪络路径约束失败,电弧灼烧绝缘子串的现象。因此该文在基本理论指导下开展了多腔室并联间隙雷电冲击闪络路径约束试验研究。首先分析多腔室并联间隙约束闪络路径的工作原理,并开展雷电冲击试验,拟合了不同腔室数量下将多腔室灭弧结构等效为棒-棒电极空气间距的公式;然后通过开展不同外串联间隙的多腔室并联间隙伏秒特性试验研究,确定了该装置整体外串联间距的设置方法。试验结果表明:根据等效间距公式分别对不同腔室数量的多腔室灭弧结构进行外串联间隙的设计,结果与理论分析相吻合,多腔室并联间隙能够先于绝缘子串闪络从而约束闪络路径,验证了多腔室灭弧结构等效棒-棒电极空气间距计算方法的准确性。多腔室并联间隙已在实际线路开展运行,能够约束闪络路径并快速淬灭电弧,保证线路安全可靠运行。The multi-chamber parallel gap(MCPG)has the advantages of simple configuration,prominent arc extinguishing performance and self-arc extinguishing function,and is widely used in lightning protection of distribution lines as a new lightning protection device.However,due to the particular configuration of the MCPG,it is different from the conventional parallel gap,and its flashover path is complex under lightning impulse.When the discharge gap is set improperly,it may cause an uncontrolled flash path and arc damage to the insulator string.In view of the deficiencies of the whole structure analysis of the existing multi-chamber arc-extinguishing structure,in this paper,the lightning impulse test of the multi-chamber arc-extinguishing structure is carried out,and the equivalent relationship between this structure and the air gap of the rod-rod electrode is calculated and analyzed.The flashover channel is confined in the multi-chamber body and the arc is quenched.It ensures the safety and stability of the transmission line,which provides a reference for the engineering design of the MCPG of the distribution line.Firstly,the constraint principle of the flashover path is analyzed,and the lightning impulse test is carried out,which obtains the lightning impulse 50%breakdown voltage of the multi-chamber arc extinguishing structure.Then,because the MCPG and the rod-rod electrode parallel gap both are in extremely non-uniform electric fields,the length of the multi-chamber arc extinguishing structure is converted into the equivalent rod-rod electrode air gap length.According to the U50%curve of the air gap of the rod-rod electrode,it is given the calculation formula of the equivalent number of chambers in a multi-chamber arc extinguishing structure.According to the equivalent calculation formula,the length of the serial outer gap can be calculated,and the multi-chamber parallel gaps with different structures can be designed.Besides,the voltage-time characteristics test is carried out to verify the feasibility of the equivale

关 键 词：防雷保护 多腔室并联间隙 等效空气间距 约束闪络路径 伏秒特性曲线 

分 类 号：TM863[电气工程—高电压与绝缘技术]