换流变压器现场交接试验绝缘电阻问题处理方法研究  

Research on the Treatment Method of Insulation Resistance in the Field Test of Commutation Transforme

作　　者：鲁翔 李成顺 张旭晶 LU Xiang;LI Chengshun;ZHANG Xujing(1 EHV Transmission Companies of China Southern Power Grid Co.,Ltd.,Guangzhou 510620,China;TBEA Shenyang Transformer Group Co.,Ltd.,Shenyang,110144,China;Guangxi Transmission and Substation Construction Co.,Ltd.,Nanning 530031,China)

机构地区：[1]中国南方电网超高压输电公司,广州510620 [2]特变电工沈阳变压器集团有限公司,沈阳110144 [3]广西送变电建设有限公司,南宁530031

出　　处：《南方能源建设》2018年第A01期77-81,共5页Southern Energy Construction

基　　金：滇西北至广东特高压直流输电工程项目资助(010000WS 25140001)

摘　　要：[目的]换流变压器是制约整个换流站工程建设进度最为关键的设备,换流变压器现场交接试验中绝缘电阻测试不合格问题经常出现,对工程建设进度造成较大影响,若未处理合格可能会对日后运行会埋下安全运行隐患。[方法]对某特高压直流工程4台高端换流变压器绝缘电阻测试不合格问题详细分析了原因,排查了造成指标不合格各种因素,研究制定了综合处理方案并开展实际验证。[结果]结果表明:可根据不同情况,分轻重缓急,采取降低绝缘油介损值或低频负载短路电流加热或整体更换绝缘油的处理方法对处理绝缘电阻问题效果较好。[结论]研究成果可为其它工程类似问题提供处理思路和方法,在保证质量的同时最大限度减少对工程进度的影响。[Introduction]Converter transformer is the most critical equipment that restricts the construction progress of the whole converter station project.The insulation resistance test of converter transformer is often unqualified in the field transfer test,which has a great impact on the construction progress of the project.If not qualified,it may bury the hidden trouble of safe operation in the future operation.[Method]The causes of nonconformity of insulation resistance test of 4 high-end converter transformers in an UHVDC project were analyzed in detail,various factors causing nonconformity of indexes are investigated,a comprehensive treatment scheme was developed and practical verification was carried out.[Result]The results show that according to different conditions,the method of reducing the dielectric loss of insulating oil or heating with low frequency load short circuit current or replacing insulation oil as a whole can be used to deal with the insulation resistance problem.[Conclusion]This paper can provide some ideas and methods for other similar engineering problems,which can ensure the quality and minimize the influence on the progress of the project.

关 键 词：换流变压器 交接试验 绝缘电阻值 介损 低频负载短路电流加热 工程进度 

分 类 号：TM7[电气工程—电力系统及自动化] TM855