基于连续先导的线路绝缘闪络判据的研究  

Research on Criterion for Line Insulation Flashover Based on Development of Continuous Leader

作　　者：肖萍[1] 汪沨[1] 黄福勇 周卫华 王国利 熊静雯[1] 安义[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082 [2]湖南省电力科学研究院,湖南省长沙市410007 [3]特高压工程技术昆明、广州国家工程实验室,广东省广州市510080

出　　处：《电网技术》2012年第11期271-276,共6页Power System Technology

基　　金：教育部新世纪优秀人才支持计划(NCET-11-0130);特高压工程技术(昆明、广州)国家工程实验室开放基金资助~~

摘　　要：在输电线路防雷性能的研究中,绝缘子闪络判据直接决定了计算线路耐雷水平的准确性。为此根据长空气间隙的物理放电机理,并综合绝缘子串的结构特点,建立了基于连续先导发展的绝缘子串闪络模型。利用该模型计算得到绝缘子串的伏秒特性曲线,并与实际测量数据相比较,验证模型的准确性。以500 kV线路为例,计算了不同闪络判据方法下的反击耐雷水平,结合国内外高压输电线路运行经验,分析了各方法的准确性和适用范围。并根据该模型进一步研究了杆塔冲击接地电阻与绝缘子串型号对线路耐雷水平的影响。研究结果表明,与传统的仅考虑绝缘子串长而对其具体结构影响考虑不充分的先导闪络判据相比,文中所建立的基于连续先导的绝缘子闪络判据模型准确性更高。In the research on lightning protection performance of transmission line, the calculation accuracy of line lightning resisting level directly depends on the criterion of insulation flashover, for this reason, according to physical discharge mechanism of long air gap and combining with structural features of insulator string an insulator string flashover model based on continuous leader development is built. Using the built model, the voltage-time characteristics is calculated and compared with measured data to verify the accuracy of the built model. Taking 500kV transmission line for example, the lightning resisting levels of flashback under different flashover criteria are calculated, and combining with operational experiences of high-voltage transmission lines home and abroad the accuracy and application scope of each criterion are analyzed. Using the built model, the influences of tower impulse earthing resistance and the types of insulator strings on line lightning resisting level are further researched. Results of the research show that comparing with traditional criterion for leader-caused flashover, in which only the length of insulator string is considered and the attention is not fully paid to concrete structure of the string, the built criterion for insulator flashover based on the development of continuous leader is more accurate.

关 键 词：连续先导 闪络判据 伏秒特性 输电线路 线路耐雷水平 

分 类 号：TM85[电气工程—高电压与绝缘技术]