1000kV交流紧凑型线路均压环参数设计和电晕特性试验布置  

Grading Ring Parameter Design and Corona Characteristic Test Arrangement of 1 000kV AC Compact Transmission Line

作　　者：黄道春[1] 谢雄杰[1,2] 黄正芳[1] 霍锋[2] 阮江军[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2013年第12期2933-2942,共10页High Voltage Engineering

基　　金：国家自然科学基金(50977066);国家电网公司国际科技合作项目(2008DFR60010)~~

摘　　要：为给1 000kV交流特高压紧凑型线路均压环设计和电晕特性试验研究提供参考,基于这种线路的初设参数,通过有限元仿真分析了均压环外形及其布置方式对均压环表面电场强度的影响。首先建立了中相复合绝缘子和均压环的3维静电场有限元全模型,分析了均压环管径、环径、安装位置、复合绝缘子小环对均压环表面最大电场强度的影响。根据仿真结果初步确定了用于真型试验的4种均压环参数配置。然后根据初设的线路杆塔结构参数,提出了在特高压交流试验基地进行均压环电晕特性试验的模拟塔窗参数和绝缘子、均压环布置方式,并建立了电晕特性试验布置方式下的3维静电场有限元模型(简称试验模型)。在试验模型中分析了4种参数均压环的表面电场强度,并与全模型的结果进行对比分析,通过电场强度等效方式建立了全模型与试验模型的修正系数。研究表明:跑道环最大电场强度在开口处,封闭圆管环最大电场强度在下半圆弧最低点。随着均压环上扛位置增大,均压环表面最大电场强度增大;随着均压环管径或环径增大,均压环表面最大电场强度减小;小环对大环表面电场强度无影响;当中相均压环参数为环径800mm、管径110mm、上扛位置140mm时,跑道环开口处表面最大电场强度为21.97kV/cm,圆环表面最大电场强度为18.44kV/cm,防晕降噪效果最好。In order to provide references for designing grading ring and corona characteristic tests of grading rings on 1 000 kV ultra-high voltage（UHV） AC compact transmission line, we analyzed the influence of the shape of grading ring and arrangement on its surface electric field intensity by using the numerical finite element method （FEM） and the pre-designed parameters of 1 000 kV UHV AC compact transmission line. Firstly, we established a 3D electrostatic field finite element model of grading ring（full model） to calculate the influences of pipe diameter, ring diameter, installation position, and small grading ring on the maximum electric field intensity on the surface of the grading ring（Era ）. Based on the calculation results, four kinds of grading rings with different parameters were preliminarily selected for true type test. Then, adopting the pre-designed tower parameters, we proposed the parameters of simulative tower window and test arrangement of composite insulator and grading ring for corona characteristic tests in UHV AC Test Base. Furthermore, a 3D electrostatic field finite element model of the corona characteristic test arrangement （test model） was also built, by which the electric field intensities of the four kinds of grading rings were calculated and compared with the results of full model. Correction coefficients between the results in the two models were also obtained based on electric field intensity equivalent method. The calculations show that for racetrack rings, the maximum field intensity all appear at their openings as well as at the nadir of lower half circle for circular rings. Em increases with the rise of grading ring＇s installation position, and it decreases with the increase of pipe diameter or ring diameter. Small grading rings show no influence on Em of big grading ring. For a middle phase racetrack grading ring with its pipe diameter of 800 mm, ring diameter of 110 mm and installation position of 140, En at its ring opening is 21. 97 kV/cm; as for a circular rin

关 键 词：特高压 紧凑型输电线路 复合绝缘子 均压环 有限元法 电场分布 修正系数 

分 类 号：TM216[一般工业技术—材料科学与工程]