大型变压器现场加热干燥方法的研究与应用.pdf

文档介绍：第 32卷第 1期中国电机工程学报 ,2012
2012年 1月 5日 Proceedingsofthe CSEE ~ . 193
文章编号:0258-8013(2012)叭一0193-06 中图分类号:TM 81 文献标志码:A 学科分类号:470·40
大型变压器现场加热干燥方法的研究与应用
刘锐,李金忠,张书琦,汤浩
(中国电力科学研究院,北京市海淀区 100192)
Studyon the On-—site Heating Method for Large·-scale Power Transformers
LIURui,LI Jinzhong,ZHANG Shuqi,TANG Hao
(China Electric Power Research Institute,Haidian District,Beijing 100192,China) District,Beijing Institute,Haidian PowerResearch Electric (China
ABSTRACT:M oisture I‘Sone of the most important factors 法;现场干燥
that can largely affect the insulation of large-scale power
0 引言
transformers,especiallyconverter present,the
method forthepower transformers hot oil still is 大型电力变压器现场安装过程中,防止受潮是
circulation method usingvacuum oilfilter,which costs a long
最关键的环节。由于直流电压的分布由材料电阻率
timeand has poor when effect the environmenttemperature is
决定,湿度变化直接导致绝缘材料的电阻率变化,
order to meet therequirement ofon·site heating for
从而导致电场局部畸变,无法保证绝缘安全【IJ。因
large-scale power transformers,short circuit method was
proposed as the on-site drying LV winding is 此,受潮对换流变压器、尤其是特高压换流变压器的
ac current equal tothe nominal current is 绝缘影响更大。目前,中国的大型电力变压器现场
appliedto heat produced by theload loss 加热干燥依然采用传统的滤油机热油循环方法 J,
can heat the winding insulation uniformly to