摘要
特高压直流输电线路的安全运行非常重要,有必要对其耐雷特性进行研究,基于ATP-EMTP仿真软件,建立了雷电流、输电线路、杆塔、杆塔接地电阻、绝缘子串相关模型,模拟了特高压直流输电线路的雷击情形,得到其反击耐雷水平。仿真表明:其反击耐雷水平较高,发生反击闪络概率较小;正极性导线相比于负极性导线,雷击闪络率更高;土壤电阻率对反击闪络率影响不明显,杆塔接地电阻、杆塔呼称高、线路绝缘水平是决定其耐雷水平的重要因素,它们分别与反击闪络率成正比、正比和反比;在实施大跨越时,无法降低杆塔呼称高时,可采取减小杆塔接地电阻和提高线路绝缘水平的方式提高其耐雷水平。
Safe operation of the UHV DC transmission line is very important, it is necessary to study its lightning performance. In this paper, based on ATP-EMTP simulation software, to establish a lightning current, transmission lines, towers, tower grounding resistance, insulator strings correlation model. It simulateslightning strike situation of UHV DC Transmission Lines toget itsback flashover level. Simulation results show that. UHV DC transmission line back flashover level is very high, probability of flashover occurs counterattack is low. Lightning flashover rate of positive polarity line compared to the negative po- larity line is higher. Soil resistivity little effect on the counterattack flashover rate. Tower grounding resistance, the height of the tower, the line insulation level is an important factor in its decision to lightning withstand levels, which are proportional, proportional and inversely proportional to counter flashover rate. In implementing big leap, not reduce the tower of nominal high, can be taken to reduce the tower grounding resistance and improve the insulation level of line way to improve its lightning withstand levels.
出处
《电力学报》
2016年第4期333-339,共7页
Journal of Electric Power
