油纸屏障对变压器局部放电超高频检测信号的影响  

Impact of Oil-Paper Barrier on Detected UHF Signal of Partial Discharge in Transformer

作　　者：高红武[1] 李剑[1] 程昌奎[1] 金卓睿[1] 王有元[1] 

机构地区：[1]重庆大学电气工程学院输配电设备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《高压电器》2009年第4期118-121,共4页High Voltage Apparatus

基　　金：教育部新世纪优秀人才支持计划资助(NCET-06-0763);重庆市科委科技计划重大项目(CSTC2005AA6003)

摘　　要：受变压器内部复杂结构的影响,局部放电超高频信号在变压器内部的传播特性非常复杂。笔者通过变压器局部放电超高频实验研究,分析了油纸屏障对变压器局部放电被测超高频信号的影响。设计了油中气隙放电、油中沿面放电和油中电晕放电3种局部放电模型,在实验油箱中进行局部放电实验,采用超高频小环天线进行放电信号检测,在有无油纸屏障情况下获得了局部放电超高频信号实测数据,对所测局部放电超高频信号在时域和频域上进行了对比分析。结果表明,油纸屏障对超高频信号幅值衰减及信号功率谱有一定影响。Due to complex internal structure of a transformer, the propagation characteristics of the partial discharge ultra-high frequency （UHF） signal are very complicated. The authors analyze the impact of the oil-paper barriers to the PD UHF signal via a PD UHF experiment, and design three different test models of cavity discharge, surface discharge and corona discharge in oil. These models are put in an oil tank respectively for experiment. A small loop UHF antenna is designed for PD detection under the condition with or without oil-paper barrier. The detected PD UHF signal is analyzed in time domain and frequency domain, respectively. Analysis results show that oil-paper barrier has a certain influence on detected UHF signal in amplitude and power spectrum.

关 键 词：变压器 局部放电 超高频信号 传播特性 油纸屏障 

分 类 号：TM407[电气工程—电器]