基于COMSOL的750 kV避雷器电位分布优化研究  

Potential Distribution Optimization Research of 750 kV Arrester Based on COMSOL

作　　者：朱月亭 吴钰颖 郭洁[2] ZHU Yue-ting;WU Yu-ying;GUO Jie(Mechanical and Electrical Engineering Division,Wenhua College,Wuhan 430074,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]文华学院机械与电气工程学部,湖北武汉430074 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《水电能源科学》2022年第5期198-201,共4页Water Resources and Power

基　　金：湖北省教育厅科学研究计划指导性项目(B2020284)。

摘　　要：为了解决750 kV瓷外套避雷器电位分布不均匀容易导致避雷器老化失效的问题,基于COMSOL有限元仿真软件建立了避雷器三维仿真模型,在避雷器高压端施加持续运行电压的峰值704.278 kV,低压端设置为零电位,研究了无均压电容、均压电容数量及电容量的差异化布置、电阻片数量及相对介电常数的差异化布置对避雷器电位分布的影响。结果表明,当避雷器内部无均压电容且各单元芯体电阻片数量均为46片时,最大电场强度为2.03 kV/mm,最大电位分布不均匀系数为1.554,超过1.15的阈值^(#)当^(#)1~^(#)4芯体电阻片数量分别为60、54、40、30时,不均匀系数降为1.348^(#)当^(#)1芯体并联3柱(41×1 100 pF)、^(#)2芯体并联3柱(41×700 pF)、^(#)3芯体并联1柱(43×700 pF)均压电容时,避雷器内部最大电场强度为2.198 kV/mm,最大电位分布不均匀系数为1.146,同时电容器承压也满足要求^(#)当避雷器^(#)3单元芯体的电阻片ε^(#)设置为484,其余电阻片ε^(#)仍为440时,最大电位分布不均匀系数由1.146降至1.105,降低了4.1%,同时^(#)1、^(#)2、^(#)4单元芯体上的电位分布不均匀系数较电阻片的相对介电常数均匀分布时有所增加,但仍满足要求。In order to solve the problem of 750 kV porcelain jacketed arrester uneven potential distribution that may easily lead to the aging failure, three-dimensional simulation model of the arrester was established based on the COMSOL finite element simulation software. The impact of uneven voltage capacitor, number of even voltage capacitor, different layout of capacitance, number of resistor and different layout of relative dielectric constant on the potential distribution of arrester was studied by setting continuous operation peak voltage(704.278 kV) in high voltage terminal of arrester and zero potential in low voltage terminal of arrester. When there is no capacitor inside the arrester and the number of resistor in each core unit are 46, the maximum electric field strength is 2.03 kV/mm, and the uniformity coefficient of the maximum potential distribution is 1.554, exceeding the threshold of 1.15. When the number of arrester unit core^(#)1,^(#)2,^(#)3,^(#)4 are 60, 54, 40, 30, its uniformity coefficient reduces by 1.348. When the arrester unit core^(#)1 is paralleled with 3 columns capacitor(each column is composed of 41 1100 pF capacitors), arrester unit core^(#)2 is paralleled with 3 columns capacitor(each column is composed of 41 700 pF capacitors), arrester unit core^(#)3 is paralleled with 1 column capacitor(column is composed of 43 700 pF capacitors), the maximum internal electric field strength of arrester is 2.198 kV/mm, the uniformity coefficient of the maximum potential distribution is 1.146, and the bearing voltage of capacitor meets the requirement. When the relative permittivity of the arrester unit core^(#)3 is set to 484 and the remaining resistors are still 440, the uniformity coefficient of the maximum potential distribution reduces to 1.105, accounts for 4.1%. At the same time, the relative permittivity of other arrester unit cores increase, but it still meets the requirement.

关 键 词：750 kV避雷器 无间隙避雷器 电位分布 均压电容 相对介电常数 

分 类 号：TM72[电气工程—电力系统及自动化]