基于危险雷电流区间分布的输电线路雷击故障性质判断方法
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摘要
雷电定位系统可获取雷电流幅值、定位等信息,用于线路雷击故障定位,但至今缺乏实用的方法将雷击信息与线路雷击跳闸信息合理整合,实现雷击故障性质判定。为此,对不同杆塔接地电阻下线路反击耐雷水平及不同地线保护角和地面倾角下线路绕击临界雷电流分布区间进行量化,得到线路直击雷危险雷电流幅值分布区间,再以雷电定位系统监测所得雷击电流幅值与反击、绕击危险雷电流区间作比对的机制,建立线路雷击故障性质判别概率算法模型,形成一套完整的雷击故障性质判断方法,并基于此开发了线路雷击故障性质判断软件。经典型雷击跳闸线路的雷击性质判断验证,该方法能实现输电线路雷击故障性质的快速判定,判断结论准确可靠。
Although the lightning stroke imformation obtained by lightning location system can be used in the field of fault location,it is lack of a practical method to intergrate lightning stroke imformation with lightning trip information,finally to achieve the goal of distinguishing back flashover from shielding failure.The variation trend of back flashover lightning withstand level under different grounding resistance is calculated so as the variation trend of critical lightning current under varying shielding angle and ground obliquity.Based on this,the dangerous lightning interval is obtained.By making proper contrast between lightning stroke current which provided by lightning location system and dangerous lightning interval,a complete set of lightning fault type judgement method is formed.A software for lightning trip types identification has been developed.The proposed judge method has been verified by the information from typical lightning tripping accidents.The line walking results shows that the method can distinguish back flashover from shielding failure flashover fast and with high accuracy.
Although the lightning stroke imformation obtained by lightning location system can be used in the field of fault location,it is lack of a practical method to intergrate lightning stroke imformation with lightning trip information,finally to achieve the goal of distinguishing back flashover from shielding failure.The variation trend of back flashover lightning withstand level under different grounding resistance is calculated so as the variation trend of critical lightning current under varying shielding angle and ground obliquity.Based on this,the dangerous lightning interval is obtained.By making proper contrast between lightning stroke current which provided by lightning location system and dangerous lightning interval,a complete set of lightning fault type judgement method is formed.A software for lightning trip types identification has been developed.The proposed judge method has been verified by the information from typical lightning tripping accidents.The line walking results shows that the method can distinguish back flashover from shielding failure flashover fast and with high accuracy.
引文
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[14]齐冲.高压输电线路雷电绕击、反击的识别[D].南宁:广西大学,2007.
[2]吴健儿.浅谈输电线路雷电绕击与反击[J].浙江电力,2007,26(4):43-46.WU Jian-er,Discussion on lightning shielding failure andcounterattack of transmission lines[J].Zhejiang ElectricPower,2007,26(4):43-46.
[3]陈家宏,吕军,钱之银,等.输电线路差异化防雷技术与策略[J].高电压技术,2009,35(12):2801-2902CHEN Jia-hong,LV Jun,QIAN Zhi-yin,et al.Differentiationtechnology and strategy of lightning protection for transmissionlines[J].High voltage engineering,2009,35(12):2801-2902.
[4]陈水明,何金良,曾嵘.输电线路雷电防护技术研究(一):雷电参数[J].高电压技术,2009,35(12):2903-2909.CHEN Shui-ming,HE Jin-liang,ZENG Rong.Lightningprotection study of transmission line,Part I:lightningparameters[J].High voltage engineering,2009,35(12):2903-2909.
[5]中华人民共和国住房和城市建设房.GB50545—2010110kV～750kV架空输电线路设计规范[S],北京:中国标准出版社,2010.
[6]中国电力工业部.DL/T62—1997交流电气装置的过电压保护和绝缘配合[S].北京:中国电力出版社,1997.
[7]曾志煌,林峰,谭进,等.浅析绕击率与保护角、坡度的关系[J].高电压技术,2006(11):174-175.ZENG Zhi-huang,LIN Feng,TAN Jin,et al.Discussion onthe relation among shield failure rate,protection angle andbevel[J].High Voltage Engineering,2006,32(11):174-175.
[8]王志勇,余占清,李雨,等.减小地线保护角对改善线路防雷性能的效果[J].高电压技术,2010,37(3):622-628.WANG Zhi-yong,YU Zhang-qing,LI Yu,et al.Effects ofreducing shielding angle on improving lightningperformance of transmission lines[J].High voltage engineering,2010,37(3):622-628.
[9]山西省电力公司.输电线路塔型手册[M].北京:中国电力出版社,2009.
[10]张纬钹,高玉明.电力系统过电压与绝缘配合[M].北京:清华大学出版社,1988.
[11]解广润.电力系统过电压[M].北京:水利电力出版社,1985.
[12]张志劲,司马文霞,蒋兴良,等.超/特高压输电线路雷电绕击防护性能研究[J].中国电机工程学报,2005,25(10):1-6.ZHANG Zhi-jin,SIMA Wen-xia,JIANG Xing-liang,et al.Study on the lightning protect ion performance of shieldingfailure for UHV&EHV transmission lines[J].Proceedingsof the CSEE,2005,25(10):1-6.
[13]李晓岚,尹小根,余仁山,等.基于改进电气几何模型的绕击跳闸率的计算[J].高电压技术,2006(3):42-44.LI Xiao-lan,YIN Xiaog-en,YU Ren-shan,eta l.Calculationof shielding fai lure flashover rate for transmission linebased on revised EGM[J].High voltage engineering,2006,32(3):42-44.
[14]齐冲.高压输电线路雷电绕击、反击的识别[D].南宁:广西大学,2007.