基于冲击接地电阻的输电线路接地极形状优化 

姜伟1，钱颖2，刘霞3 
1 国网山西省太原供电公司，山西 太原 030012；
2 国网湖北省赤壁市供电公司，湖北 赤壁 437300；
3 山西晋能燃料有限责任公司，山西 太原 030002 
 

摘 要：降低输电线路杆塔接地极的冲击接地电阻能有效防止线路遭受雷击。采用冲击系数法，对不同形状接地极的冲击接地电阻进行计算分析，得出冲击接地电阻随土壤电阻率增加而变大；随电极埋深变大而减小；随电极有效面积增大而减小。在此基础上改进接地极的形状，采用ETAP软件对改造后的接地极进行仿真计算，结果表明，改造后的接地极的冲击接地电阻明显减小，达到了较好的防雷效果。
关键词：冲击接地电阻；冲击系数法；接地极形状；安全裕度
中图分类号：TM862；TM934.15 文献标识码：A 文章编号：1007-3175(2014)04-0023-04

Grounding Electrode Shape Optimization of Power Transmission Line Based on Impulse Grounding Resistance 

JIANG Wei1, QIAN Ying2, LIU Xia3 
1 Shanxi Taiyuan Power Supply Company of State Grid, Taiyuan 030012, China;
2 Hubei Chibi Power Supply Company of State Grid, Chibi 437300, China; 
3 Shanxi Jinneng Fuel Co., Ltd, Taiyuan 030002, China 
 

Abstract:To reduce transmission line pole and tower impulse grounding resistance can effectively prevent lines from lightning. The impulse coefficient method was adopted to calculate and to analyze the impulse grounding resistance of different grounding shapes, to get out the result that the impulse grounding resistance increases following soil resistance increasing, reduces following electrode buried depth increasing and reduces following electrode effective area increasing. On this basis, the grounding electrode shape was improved. ETAP software was used to carry out simulation for the rebuilt impulse grounding resistance. The results show that the rebuilt impulse grounding resistance is obviously reduced, reaching better anti-lighting effect.
          Key words: impulse grounding resistance; impulse coefficient method; grounding electrode shape; safety margin

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