王少华a,金祖山a,李〓特a,许杨勇b,周象贤a.特高压输电线路雷电绕击影响因素及防护措施[J].水电能源科学,2018,36(6):197-200
特高压输电线路雷电绕击影响因素及防护措施
Influencing Factors and Protective Measures of Shielding Failure for Ultra high Voltage Transmission Lines
  
DOI:
中文关键词:  特高压  绕击  保护角  线路避雷器  杆塔侧针
英文关键词:UHV  lightning shielding failure  shielding angle  line arrestor  sideward rods
基金项目:国网浙江省电力公司科技项目(2011DS16002P)
作者单位
王少华a,金祖山a,李〓特a,许杨勇b,周象贤a 国网浙江省电力公司 a. 电力科学研究院; b. 检修分公司浙江 杭州 310014 
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中文摘要:
      针对雷电绕击对特高压输电线路运行可靠性的影响,在总结分析特高压交直流输电线路雷电绕击影响因素的基础上,结合现场运行数据及雷击观测对绕击防护措施的适用性及研究重点进行分析。结果表明,对交直流特高压线路绕击产生影响的因素有运行电压、保护角、地面倾角、杆塔塔型、线路弧垂等;根据地形选取合适的保护角可以将线路整体绕击跳闸率控制在较低水平,但个别塔位仍存在绕击风险;线路避雷器可大幅提升绕击耐雷水平,但大绕击电流、多次回击下避雷器能否承受雷电能量尚需进一步研究;杆塔侧针能大幅减小杆塔附近的绕击概率,但其保护范围能否覆盖线路绕击危险区域是确定其适用性的关键,亦需进一步研究。
英文摘要:
      Aiming at the influence of lightning shielding failure on the operation reliability of Ultra high voltage (UHV) transmission lines, the influencing factors of lightning shielding failure of UHV transmission lines was reviewed. The adaptability and the research directions of protective measures were discussed based on site operation data and lightning strike observation. It is shown that the lightning shielding failure of UHV transmission line is affected by operation voltage, shielding angle, ground dip angle, tower type and sag of lines. The lightning trip out rate of UHV lines can be limited in low level by choosing appropriate shielding angle. However, the specific tower may be different. Line arrestor can promote the shielding failure protection performance apparently while the security under conditions of large lightning current multi stroke needs to be studied. Sideward rods on tower can reduce the stroke probability near tower if the protective range of sideward rods can cover the stroke dangerous region. The protective range of sideward rods need to be further researched.
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