变压器高压套管介损现场试验的分析与探讨  

Analysis and Discussion of Transformer High-voltage Bushing Dielectric Loss Test

作　　者：吴冬文[1] 胡道明[1] 

机构地区：[1]江西省电力公司超高压分公司,江西南昌330009

出　　处：《江西电力》2011年第4期5-7,10,共4页Jiangxi Electric Power

摘　　要：测量变压器高压套管电容量和介质损耗因数是提取设备状态量的重要例行试验项目,而介质损耗因又是测量非常灵敏、测量精度要求非常高的试验项目,很容易受到外界电磁干扰、电场干扰和空间干扰。本文介绍了几起变压器高压套管电气绝缘介损现场试验过程中,由于空间结构干扰,使得测量tgδ数据与初值偏差非常大的例子,并从介损电桥原理入手,分析各种测量数据偏差的电气原理,以及如何正确地采用测量极屏蔽线排除外界空间干扰信号,得到反映绝缘状况的最准确的数据的方法。最后,介绍了常见的高压套管连片式末屏接地结构给测量介损带来误差的原因,并提出改进此类套管末屏接地的建议。Measuring transformer high-voltage bushing capacity and dielectric loss factor are regular test for realizing equipment situation.Dielectric loss factor test,a flexible and precision test,was interfered by external electromagnet,electric field and space.Several tests were interfered by space structure which result in gap between tgδ and initial value.Method to get precision data was presented through briage principle and electronic principle.At last,reason of error caused by high-voltage bushing tap grounding structure was pointed out and suggestions to improve tap grounding were proposed.

关 键 词：介质损耗因数测量 高压套管 空间干扰 电桥 套管末屏接地 

分 类 号：TM855[电气工程—高电压与绝缘技术]