基于地中电场分布的针刺式接地装置结构参数优化  

Structure Parameter Optimization of Grounding Device With Needle-Shaped Conductors Based on Electric Field Distribution in Soil

作　　者：朱彬[1] 司马文霞[1] 袁涛[1] 郭润生[2] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]山西省电力公司朔州供电分公司,山西省朔州市036002

出　　处：《电网技术》2015年第10期2907-2914,共8页Power System Technology

基　　金：国家自然科学基金项目(51107153);教育部中央高校基本科研业务费专项资金资助项目(CDJZR11150006)~~

摘　　要：已有的研究结论表明,在接地极上添加“针刺状”短导体可有效改善接地装置的冲击接地性能。建立了接地极冲击特性有限元模型,分析了端部效应、电流屏蔽效应对地中电场分布的影响规律,系统地研究了所添加的短导体长度及相邻短导体之间的间距对接地极周围土壤火花放电区域与冲击电阻的影响,并对仿真结论进行了试验验证。研究结果表明,短导体长度主要受接地极本体的火花放电及接地极与短导体之间的电流屏蔽效应的影响,所添加短导体的长度宜为0.5～1.0 m;相邻短导体之间的合理间距主要受接地极与短导体之间、相邻短导体之间的电流屏蔽效应的影响,短导体长度为0.5 m时,其相邻间距宜为0.5～0.8 m;短导体长度为1.0 m时,其相邻间距宜为1.0～1.6m;综合考虑,短导体布置间距可取为短导体长度的1～1.5倍。Existing research findings showed that adding needle-shaped short conductors on the grounding electrodes can effectively improve the impulse performance of grounding devices. In this paper, the finite element model （FEM） of impulse characteristics of grounding electrode is established. By analyzing current shielding effect and end effect, the influence law of the length and interval of needle-shaped short conductors on spark discharge region and impulse resistance is systematically researched. Then the conclusions are proved by impulse characteristic experiments. The results show that, the appropriate .length of short conductor is mainly affected by the spark discharge of grounding electrode itself and current shielding effect between needle-shaped short conductors grounding conductors and The appropriate length of short conductor is 0.5-1.0 m. The appropriate interval between adjacent short conductors is mainly affected by the current shielding effect between grounding conductors and needle-shaped short conductors and between adjacent short conductors. The interval with 0.5 m length short conductor should be arranged for 0.5-0.8 m, while the interval with 1.0 m length short conductor should be arranged for 1.0-1.6 m. Synthetically, the interval of short conductor should be 1-1.5 times of the length of short conductor.

关 键 词：电场分布 火花区域 短导体 长度 间距 

分 类 号：TM86[电气工程—高电压与绝缘技术]