摘要
为了满足高海拔变电站金具防晕降噪的要求,使金具具有良好的电气性能,运用Ansys软件和紫外成像仪重点研究了500kV变电站典型门型构架吊管母V型绝缘子串均压环的电晕特性。首先建立静电场有限元模型进行仿真计算,然后对均压环表面最大电场强度进行海拔校正和均压环结构优化。计算结果表明,均压环表面最大电场强度出现在近管母终端球端拐角处,管径130mm的均压环可以满足海拔高度4 000m处变电站的运行要求。为了对计算结果进行验证,采用与计算模型相同参数的均压环,运用紫外成像仪在平原地区和高海拔地区进行了可见电晕试验研究。试验结果表明,均压环电晕起始电压和电晕熄灭电压都明显高于标准要求值,电晕起始部位在均压环拐角处,与计算结果一致。因此,经过优化后的均压环具有较好的电晕特性,可以满足高海拔变电站的运行要求。
In order to meet the anti-corona and noise reduction requirements of substation fittings at high altitude and to assure the fittings of good electrical performance,we studied the corona characteristics of grading rings of typical V-shaped insulator string hanging tubular busbars in 500 kV substation door-frame tower by using the software Ansys and ultraviolet imaging instruments.Moreover,we established an electrostatic field finite element model for numerical analysis,and calculated the maximum electric field strength on the surface of grading ring.The maximum electric field strength was further corrected according to the altitude,and the structure of grading ring was optimized.The calculation results show that the maximum electric field strength of grading ring appears at the corner where near thetubular busbar terminal ball-side,and that a ring diameter of 130 mm can meet the operational requirements of substation at the altitude of 4 000 m.In order to validate the calculation results,corona tests at both plain region and high altitude area were carried out with grading ring’s parameters equal to the calculation model.The test results show that the corona inception voltage and distinguish voltage of grading rings are higher than the values of standard requirements,and that the corona onset part is at the ring’s corner.The experimental results are consistent with the calculation results.Therefore,it is concluded that the optimized grading ring has good corona characteristics and can meet the requirements of high-altitude operation.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期661-667,共7页
High Voltage Engineering
基金
云南电网公司科技项目(WNJ101-0097)~~
关键词
高海拔
变电站绝缘子串
均压环
电晕特性
有限元法
电场分布
high altitude
insulator string of substation
grading ring
corona characteristics
finite element method
electric field distribution
