摘要
内蒙古地区17座500 kV超高压交流变电站电晕放电的观测结果表明,变电站内分裂导线间隔棒表面电晕放电最为剧烈。为有效抑制分裂导线间隔棒表面电晕放电,首先建立分裂导线间隔棒有限元模型进行仿真计算,然后提出分裂导线间隔棒结构优化设计方案。结果表明:内蒙古地区500 kV变电站现用的曲率半径R_(1)=40 mm、R_(2)=10 mm的间隔棒表面最大电场强度位于线夹头部曲率半径R_(2)圆弧段处,且大于起晕场强,为降低间隔棒表面的电场强度,采取改变间隔棒线夹头部曲率半径R 1和R 2的方法。仿真结果表明,相比增大R 1,增大R 2对于降低间隔棒线夹头部电场强度的效果更加显著。因此,将间隔棒线夹头部曲率半径R 2由10 mm增大至20 mm时,可以满足内蒙古地区500 kV超高压交流变电站分裂导线间隔棒防晕要求。为对计算结果进行验证,在中国电力科学研究院开展分裂导线间隔棒起晕特性试验,验证间隔棒线夹头部曲率半径分别为R_(1)=40 mm、R_(2)=10 mm和R_(1)=40 mm、R_(2)=20 mm时的起晕特性,所得试验结果与计算结果一致。因此可说明,经过优化后的分裂导线间隔棒具有较好的电晕特性。
It was shown that the corona discharge on the surface of bundle conductor spacer is the most intense based on the observation results of corona discharge in 17500 kV EHV AC substations in Inner Mongolia.In order to effectively suppress the corona discharge of bundle conductor spacer,the finite element model of bundle conductor spacer was established for numerical calculation,and the structural optimization design scheme of bundle conductor spacer was proposed.The results show that the maximum electric field intensity on the surface of spacer with curvature radius R_(1)=40 mm and R 2=10 mm in 500 kV substation in Inner Mongolia is located at the arc section of curve radius R_(2) of wire collet,and is greater than the corona onset field intensity.In order to reduce the electric field intensity on the surface of spacer,the method of changing the curvature radius R_(1) and R_(2) of spacer wire collet was adopted.The simulation results show that increasing R_(2) has more significant influence on reducing the electric field intensity at the head of spacer clamp than increasing R 1.Therefore,when the curvature radius R 2 of spacer clamp is increased from 10 mm to 20 mm,the anti-corona requirements of bundle conductor spacer in 500 kV extra-high voltage(EHV)AC Substation in Inner Mongolia can be met.In order to verify the calculation results,the corona onset characteristics test of bundle conductor spacer was carried out in China Electric Power Research Institute to verify the corona onset characteristics when the curvature radius of spacer clamp is R_(1)=40 mm、R_(2)=10 mm andR_(1)=40 mm、R_(2)=20 mm respectively.The experimental results are consistent with the calculated results.Therefore,it can be concluded that the optimized bundle conductor spacer has the better corona characteristics.
作者
薛炜晔
黄世龙
闫晓亮
茆杰
哈林
段振梁
XUE Wei-ye;HUANG Shi-long;YAN Xiao-liang;MAO Jie;HA Lin;DUAN Zhen-liang(Hebei Key Laboratory of Power Transmission and Transformation Equipment Security Defense,North China Electric Power University,Baoding 071003,China;Xingtai Power Supply Branch of State Grid Hebei Electric Power Company,Xingtai 054000,China;Wuwei Power Supply Branch of State Grid Gansu Electric Power Company,Wuwei 733099,China)
出处
《科学技术与工程》
北大核心
2023年第20期8693-8700,共8页
Science Technology and Engineering
基金
国家自然科学基金(52007063)
中央高校基本科研业务费(2020MS092)
电力规划总院项目(K201909-D)。
关键词
分裂导线间隔棒
电晕放电
有限元分析
电晕特性实验
bundle conductor spacer
corona discharge
finite element analysis
corona characteristic test
