针刺式接地装置降阻机制的仿真和试验研究Simulation and Experiment Study on Resistance-Reducing Mechanism of Grounding Device With Spicules
李景丽;蒋建东;李丽丽;
摘要(Abstract):
改善高土壤电阻率地区输电线路杆塔接地装置的冲击散流效率、降低其暂态接地阻抗是提高输电线路耐雷性能的有效措施。采用考虑土壤电离动态过程的接地装置冲击特性有限元模型分别对水平星型接地装置及添加针刺的水平星型接地装置建立有限元分析模型,通过对比加针前后接地装置在冲击电流作用下产生的地表电位分布、地电位升及其周围土壤中的电场分布等参数,分析了针刺式接地装置的降阻机制,认为在土壤结构、电阻率和注入冲击电流一定的条件下,改变接地装置的局部结构,能够使冲击电流入地时土壤中局部电场畸变加强,扩大火花放电区域,从而减小冲击接地电阻。另外基于相似性准则对加针前后的星型水平接地极进行模拟试验测量其冲击接地阻抗,试验结果与数值计算结果的对比分析证实了针刺式接地装置的降阻效果。
关键词(KeyWords): 针刺式接地装置;降阻;模拟试验;端部效应;火花放电;电场分布
基金项目(Foundation):
作者(Author): 李景丽;蒋建东;李丽丽;
Email:
DOI: 10.13335/j.1000-3673.pst.2013.01.037
参考文献(References):
- [1]何金良,曾嵘.电力系统接地技术[M].北京:科学出版社,2007:1-5.
- [2]苏杰,吴广宁,周炜明,等.异质土壤对地网接地电阻的影响[J].电网技术,2010,34(9):166-169.Su Jie,Wu Guangning,Zhou Weiming,et al.Effects of heterogeneoussoil on grounding resistance of grounding mesh[J].Power SystemTechnology,2010,34(9):166-169(in Chinese).
- [3]何金良,康鹏,曾嵘,等.青藏铁路110kV输变电工程五道梁和沱沱河变电站的接地系统设计[J].电网技术,2006,30(4):60-64.He Jinliang,Kang Peng,Zeng Rong,et al.Grounding system designof Wudaoliang and Tuotuohe substations for 110kV powertransmission engineering of Qinghai-tibet railway[J].Power SystemTechnology,2006,30(4):60-64(in Chinese).
- [4]王晶晶,何金良,邹军.季节性冻土对变电站接地系统分流系数的影响[J].电网技术,2006,30(2):41-45.Wang Jingjing,He Jinliang,Zou Jun.Influences of seasonal frozensoil layer on current division factor of substation grounding system[J].Power System Technology,2006,30(2):41-45(in Chinese).
- [5]张曾,文习山.任意块状结构土壤中接地的边界元法分析[J].电网技术,2010,34(9):170-174.Zhang Zeng,Wen Xishan.Boundary element analysis on groundingsystems in soil with arbitrary massive texture[J].Power SystemTechnology,2010,34(9):170-174(in Chinese).
- [6]齐磊,崔翔,赵志斌.复杂接地系统冲击接地特性的数值计算及试验[J].电网技术,2006,30(13):66-80.Qi Lei,Cui Xiang,Zhao Zhibin.Numerical calculation andexperimental research of impulse grounding performance of complexgrounding system[J].Power System Technology,2006,30(13):66-80(in Chinese).
- [7]Yang C W,Sima W X,Yuan T,et al.Experimental analysis onshielding effect of the grounding electrodes under impulse current[J].High Voltage Engineering,2008,34(12):2609-2615.
- [8]Li J L,Yuan T,Yang Q,et al.Numerical and experimentalinvestigation of grounding electrode impulse current dispersalregularity considering the transient ionization phenomenon[J].IEEETransactions on Power Delivery,2011,26(4):2647-2658.
- [9]李景丽,袁涛,杨庆,等.考虑土壤电离动态过程的接地体有限元模型[J].中国电机工程学报,2011,31(22):149-157.Li Jingli,Yuan Tao,Yang Qing,et al.Finite element model ofgrounding system considering soil dynamic ionization[J].Proceedings of the CSEE,2011,31(22):149-157(in Chinese).
- [10]金建铭.电磁场有限元方法[M].西安:西安电子科技大学出版社,1998:16-17.
- [11]Stochniol A.A general transformation for open boundary finiteelement method for electromagnetic problems[J].IEEE Transactionon Magnetics,1992,28(2):1679-1681.
- [12]He J L,Zeng R,Tu Y P.Laboratory investigation of impulsecharacteristics of transmission tower grounding devices[J].IEEETransactions on Power Delivery,2003,18(3):994-1001.
- [13]何金良,曾嵘,陈水明,等.输电线路杆塔冲击接地阻抗特性的模拟试验研究[J].清华大学学报:自然科学版,1999,39(5):5-8.He Jinliang,Zeng Rong,Chen Shuiming,et al.Simulatingexperiments of the impulse resistance characteristics of transmissionline grounding devices[J].Journal of Tsinghua University:Sci&TechEdition,1999,39(5):5-8(in Chinese).
- [14]黄文武,文习山,谢俊.接地网轴向电流分布的模拟试验[J].高电压技术,2005,31(6):76-77.Huang Wenwu,Wen Xishan,Xie Jun.Simulation experiment of thecurrent distribution along axial direction of the grounding network[J].High Voltage Engineering,2005,31(6):76-77(in Chinese).
- [15]Dawalibi F,Mukhedkar D,Bensted D.Measured and computedcurrent densities in buried ground conductors[J].IEEE Transactionson Power Apparatus and Systems,1981,100(8):4083-4092.
- [16]李景丽.接地网频域性能及杆塔接地及冲击特性的数值分析及试验研究[D].重庆:重庆大学,2011.
- [17]Geri A,Veca G M,Garbagnati E,et al.Non-linear behavior of groundelectrodes under lightning surge currents:computer modeling andcomparison with experimental results[J].IEEE Transactions onMagnetic,1992,28(2):1442-1445.
- [18]谢广润.电力系统接地技术[M].北京:水利电力出版社,1991:55-58.