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动车组车顶隔离开关用支柱绝缘子污秽状态下的电场分布特性研究OACSTPCD

Research on the electric field distribution characteristics under polluted conditions of EMU roof isolation switch post insulators

中文摘要英文摘要

研究污秽状态下支柱绝缘子的电场分布特性有助于理解其放电机理.文中以FQJG2-30-16-400-M型车顶复合支柱绝缘子为研究对象,进行如下研究:对绝缘子表面进行淋雨试验,同时施加40 kV工频电压,靠近金具部分的伞裙首先发生闪络,且出现了干燥带,伞裙边缘形成大粒径的水珠时,容易引发表面放电.利用COMSOL有限元分析软件在绝缘子靠近金具的伞裙表面设置干燥带和水珠,护套表面存在干燥带时,电场畸变明显,杆径处的干燥带场强最大,上表面干燥带场强大于下表面干燥带场强,干燥带场强最大值随着干燥带数量增加反而减小.绝缘子表面出现水珠时,水珠附近的场强明显增大,越靠近中轴线水珠表面电场强度越大.靠近高压端的水珠的最大电场强度受半径的影响较大,低压端则不明显.

It is helpful to understand the discharge mechanism of post insulators to study the electric field distribution characteristics under polluted conditions.In this paper,the FQJG2-30-16-400-M model roof composite post insulator is taken as the research object,and the following research is carried out:the surface of the insulator is subjected to rain test,and 40 kV power frequency voltage is applied.Flashover occurs first in the skirt close to the gold fittings,and the dry band appears.When the skirt edge forms large particle size of water droplets,surface discharge is likely to occur.The fi-nite element analysis software COMSOL in insulator with the near umbrella skirt is used to set dry band and water surface.When the surface of the sheath dry band exists,the electric field distortion is obvious,stem diameter in the dry band has the largest field intensity,the surface with dry field strength is greater than the surface dry field,dry with a maximum field strength as dry with increase in the number decreases.When water beads appear on the surface of an insulator,the field intensity near the beads increases significantly,and the closer to the central axis the beads are,the greater the electric field intensity is.The maximum electric field intensity of water droplets near the high pressure end is greatly affected by the radius,while that near the low pressure end is not obvious.

常波;张启哲;王胜辉;律方成

华北电力大学新能源电力系统全国重点实验室,北京 102206

动力与电气工程

动车组车顶支柱绝缘子污秽干燥带水珠电场

EMUroof post insulatorpollutiondry bandwater beadselectric field

《电测与仪表》 2024 (004)

81-85 / 5

国家重点研发计划项目(2018YFF01011900);中国中车股份有限公司科技研究开发计划项目(2018CDA005-3)

10.19753/j.issn1001-1390.2024.04.012

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