大型变压器现场加热干燥方法的研究与应用-中国电机工程学报.PDFVIP

第32 卷 第1 期 中 国 电 机 工 程 学 报 Vol.32 No.1 Jan.5, 2012 2012 年1 月5 日 Proceedings of the CSEE ©2012 Chin.Soc.for Elec.Eng. 193 文章编号：0258-8013 (2012) 01-0193-06 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) Study on the On-site Heating Method for Large-scale Power Transformers LIU Rui, LI Jinzhong, ZHANG Shuqi, TANG Hao (China Electric Power Research Institute, Haidian District, Beijing 100192, China) ABSTRACT: Moisture is one of the most important factors 法；现场干燥 that can largely affect the insulation of large-scale power 0 引言 transformers, especially converter transformers. At present, the on-site drying method for the power transformers is still hot oil 大型电力变压器现场安装过程中，防止受潮是 circulation method using vacuum oil filter, 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 time and has poor effect when the environment temperature is 决定，湿度变化直接导致绝缘材料的电阻率变化， low. In order to meet the requirement of on-site heating for 从而导致电场局部畸变，无法保证绝缘安全[1] 。因 large-scale power transformers, short circuit method was proposed as the on-site drying method. The LV winding is 此，受潮对换流变压器、尤其是特高压换流变压器的 short-circuited, and ac current equal to the nominal current is 绝缘影响更大。目前，中国的大型电力变压器现场 applied to the HV winding. The heat produced by the load loss 加热干燥依然采用传统的滤油机热油循环方法[2-5]， can heat the winding insulation uniformly to the designated 对于容量的改变，只是增加热油循环时间、抽真空 temperature uniformly so as to dry the insulation. A set of short [6-7]