基于沖擊接地電阻的輸電線(xiàn)路接地極形狀優(yōu)化
姜偉1，錢(qián)穎2，劉霞3
1 國(guó)網(wǎng)山西省太原供電公司，山西 太原 030012；
2 國(guó)網(wǎng)湖北省赤壁市供電公司，湖北 赤壁 437300；
3 山西晉能燃料有限責(zé)任公司，山西 太原 030002
摘 要：降低輸電線(xiàn)路桿塔接地極的沖擊接地電阻能有效防止線(xiàn)路遭受雷擊。采用沖擊系數(shù)法，對(duì)不同形狀接地極的沖擊接地電阻進(jìn)行計(jì)算分析，得出沖擊接地電阻隨土壤電阻率增加而變大；隨電極埋深變大而減小；隨電極有效面積增大而減小。在此基礎(chǔ)上改進(jìn)接地極的形狀，采用ETAP軟件對(duì)改造后的接地極進(jìn)行仿真計(jì)算，結(jié)果表明，改造后的接地極的沖擊接地電阻明顯減小，達(dá)到了較好的防雷效果。
關(guān)鍵詞：沖擊接地電阻；沖擊系數(shù)法；接地極形狀；安全裕度
中圖分類(lèi)號(hào)：TM862；TM934.15 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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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