高海拔特高压变压器均压环结构设计  

Design of grading ring structure for high altitude ultra-high voltage transformers

作　　者：廖文龙 丁理杰 朱天宇 黄治文 张榆 魏文赋[2] LIAO Wenlong;DING Lijie;ZHU Tianyu;HUANG Zhiwen;ZHANG Yu;WEI Wenfu(State Grid Sichuan Electric Power Company Research Institute,Chengdu 610041,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]西南交通大学电气工程学院,四川成都611756

出　　处：《电力工程技术》2024年第5期216-223,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52077182)。

摘　　要：特高压变压器在投运前需要进行严格的交接试验以保证其能安全可靠运行,而变压器上均压环的均压能力会影响交接试验的准确性。高海拔环境下均压环结构出现问题时其均压能力会发生变化,因此研究设计面对不同状况都能有良好均压能力的均压环尤为重要。文中首先采用COMSOL软件搭建了500 kV变压器耐压试验回路三维模型;其次研究均压环的管径、环径和环间距变化对均压环均压能力的影响;最后研究均压环在毛糙状态下的均压能力变化。研究发现在均压环管径和环径增大或环间距减小时,均压环均压能力会增强,其中管径改变带来的影响最大;均压环为毛糙表面时其均压能力会显著下降,其中粘附圆锥颗粒时均压能力下降最显著,凹陷时下降最少,说明均压环表面越平整,均压能力越好。该研究能为高海拔特高压变压器均压环设计相关工作提供一定帮助。Before putting into operation,ultra-high voltage transformers need to undergo strict handover tests to ensure their safe and reliable operation.The grading capacity of the grading ring on the transformer will affect the accuracy of the handover test.When there are problems with high altitude environments or grading ring structures,their grading ability will change.It is particularly important to study and design grading rings that can have good grading ability in different situations.This article first uses COMSOL software to build a three-dimensional model of the withstand voltage test circuit of a 500 kV transformer.Secondly,the influence of changes in the pipe diameter and ring spacing of the equalizing ring on the equalizing capacity of the equalizing ring is studied.Finally,the variation of equalizing capacity of the equalizing ring in a rough state is studied.It is found that as the diameter of the equalizing pipe and the ring diameter increase or the distance between the rings decreases,the equalizing ability of the equalizing ring will be enhanced,with the greatest impact brought by the change in pipe diameter.When the grading ring has a rough surface,its grading ability will significantly decrease.Among them,the grading ability decreases most significantly when adhering to conical particles,and decreases least when concave,indicating that the smoother the surface of the grading ring,the better the grading ability.This study can provide some assistance for the design of grading rings for high altitude ultra-high voltage transformers.

关 键 词：高海拔 变压器 均压环 电场分布 电晕放电 毛糙问题 

分 类 号：TM503[电气工程—电器]