10kV绝缘架空线路避雷线的保护角选择
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摘要
10kV配电线路分布广泛,绝缘水平低,在雷电活动频繁的地区,雷害事故经常发生。随着配电网的绝缘化改造,雷击断线问题日益显著。介绍了避雷线防雷原理,架设避雷线时需要考虑的因素,保护角对避雷线的绕击率、耦合系数、雷击跳闸率的影响,结合一个实例介绍10kV绝缘架空线的避雷线保护角选择方法,并在EMTP中进行了仿真,验证其防雷效果,得出典型的单回水泥杆塔10kV绝缘架空线架设避雷线选取保护角的最佳方案为25°。
The 10kV distribution lines are widely distributed and the insulation level is low. In areas with frequent lightning activities,lightning accidents often occur. With the insulation transformation of the distribution network,the problem of lightning strikes is becoming more and more significant. The lightning protection principle of the lightning protection line is introduced. The factors to be considered when setting up the lightning protection line,the influence of the protection angle on the lightning protection rate,coupling coefficient and lightning trip rate of the lightning protection line. The method of selecting the lightning protection angle of the 10kV insulated overhead line is introduced with an example,and the simulation is carried out in EMTP to verify its lightning protection effect. It is concluded that the optimized scheme for choosing shielding angle is 25° for typical single loop 10kV cement tower insulated line insulated overhead line to equipped with a ground wire.
The 10kV distribution lines are widely distributed and the insulation level is low. In areas with frequent lightning activities,lightning accidents often occur. With the insulation transformation of the distribution network,the problem of lightning strikes is becoming more and more significant. The lightning protection principle of the lightning protection line is introduced. The factors to be considered when setting up the lightning protection line,the influence of the protection angle on the lightning protection rate,coupling coefficient and lightning trip rate of the lightning protection line. The method of selecting the lightning protection angle of the 10kV insulated overhead line is introduced with an example,and the simulation is carried out in EMTP to verify its lightning protection effect. It is concluded that the optimized scheme for choosing shielding angle is 25° for typical single loop 10kV cement tower insulated line insulated overhead line to equipped with a ground wire.
引文
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[2]陈维江,沈海滨,陈秀娟,等. 10 k V配电网架空绝缘导线雷击断线防护[J].电网技术,2007,33(22):34-37.CHEN Weijiang,SHEN Haibin,CHEN Xiujuan,et al.Measures to prevent lighting-caused breakage of overhead Insulated conductors in 10 k V distribution networks[J]. Insulators and Surge Arresters,2007,33(22):34-37.
[3]韦钰,王培元,陈宇晨. 10kV架空绝缘导线的防雷仿真研究[J].电瓷避雷器,2013,255(5):85-89.WEI Yu,WANG Peiyuan,CHEN Yuchen. Simulation study on lightning protection of 10 k V overhead insulated line[J]. Insulators and Surge Arresters,2013,255(5):85-89.
[4]刘刚,陈荣锋,莫芸. 10 k V架空配电线路避雷线架设高度的探讨[J].电瓷避雷器,2012,248(4):33-38.LIU Gang,CHEN Rongfeng,MO Yun. Discussion on the erecting height of ground wire in 10 k V overhead distribution lines[J]. Insulators and Surge Arresters,2012,248(4):33-38.
[5]沈其工.高电压技术[M].第4版.北京:中国电力出版社,2012.
[6]李傲岸,刘崇新,王安迪,等. 10 k V配电线路防雷仿真分析[J].电工电气,2015,13(8):13-17.LI Aoan,LIU Chongxin,WANG Andi,et al. Lightning protection simulation analysis of 10 k V distribution line[J]. Electrotechnics Electric(Jiangsu Electrical Apparatus),2015,13(8):13-17.
[7]陈成财.架空配电线路雷击跳闸率的计算方法[J].电瓷避雷器,2015,267(5):145-148.CHEN Chengcai. Calculation method of lightning tripping rate of overhead distribution lines[J]. Insulators and Surge Arresters,2015,267(5):145-148.
[8]韦钰,姚惠钦,陈宇晨.城市10 k V配电线直击雷过电压仿真计算[J].上海工程技术大学学报,2013,27(1):17-19.WEI Yu,YAO Huiqin,CHEN Yuchen. Simulation study on lightning protection of 10 k V overhead insulated line[J]. Journal of Shanghai University of Engineering Science,2013,27(1):17-19.
[9]顾用地.基于ATP-EMTP的10 k V配电线路雷击性能研究[J].电瓷避雷器,2015,34(5):154-158.GU Yongde. Research on lightning performance of 10 k V distribution lines based on ATP-EMTP[J]. Insulators and Surge Arresters,2015,34(5):154-158.
[10]林苗.避雷线对带电导线的防雷保护角问题研究[J].电瓷避雷器,2009(4):27-29.LIN Miao. Study on the lightning protection angle of the lightning shield wire to the energized conductor[J]. Insulators and Surge Arresters,2009(4):27-29.
[11]吴广宁.高电压技术[M].北京:机械工业出版社,2007.
[12]邱毓昌.高电压工程[M].西安:西安交通大学出版社,1995.
[13]张纬钹,何金良,高玉明.过电压防护及绝缘配合[M].北京:清华大学出版社,2002.
[14]李福寿.电力系统过电压计算[M].北京:北京水利电力出版社,1988.
[15]胡国荣.输电线路基础[M].北京:中国电力出版社,1993.