变压器油纸绝缘频域介电谱特性的XY模型仿真及试验研究  

Experimental Investigation and XY Model Simulation on the Frequency Domain Spectroscopy Characteristics of Transformer Oil-paper Insulation

作　　者：文华 马志钦 王耀龙 赵现平 廖瑞金[3] 郝建[4] 

机构地区：[1]云南电力试验研究院(集团)有限公司电力研究院,昆明650051 [2]广东省电网公司电力科学研究院,广州510080 [3]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [4]重庆市电力公司电力科学研究院,重庆401123

出　　处：《高电压技术》2012年第8期1956-1964,共9页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724505-1);输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512708103)~~

摘　　要：为将频域介电谱法更好地用于对变压器油纸绝缘状态的现场诊断,通过联合XY模型仿真和主绝缘结构可变的变压器模型对变压器油纸绝缘系统的频域介电谱特性(FDS)进行研究。首先,借助于Concept 80宽频介电谱仪和介电响应分析仪DIRANA验证了XY模型仿真结果和变压器模型实测结果的等效性。然后,以绝缘纸板的复介电常数频域谱数据为基础,采用XY模型仿真系统地探讨了油纸绝缘系统在不同绝缘结构、绝缘油电导率、绝缘纸水分含量和老化状态等情况下的频域介电谱特性。研究结果表明:当绝缘油电导率较大时,在tanδ频域谱的低频部分出现"凸起","凸起"峰值所在频率随油电导率增大向高频方向平移,但幅值不变;随绝缘结构中X或Y值增大,"凸起"所在频率向高频方向平移,但幅值反而减小;随老化程度的加深,tanδ频域谱向高频方向移动;该研究提供了一种利用频域介电谱法诊断变压器老化状态的新思路。In order to achieve better field-diagnostic performance of frequency domain spectroscopy in diagnosing insulation status of oil-paper in transformers,the frequency domain spectroscopy characteristics of transformer oilpaper insulation system is investigated on the basis of XY model simulation associated with a transformer experimental model,which supports main insulation structure modification.Firstly,the equivalence between XY model simulation and field FDS measurement of transformer model is verified using the Concept 80broadband dielectric spectrometer and dielectric response analyzer apparatus DIRANA.Then,based on the complex permittivity spectroscopy data of pressboard,frequency domain spectroscopy characteristics of oil-paper insulation system under different conditions,such as different insulation structures,oil conductivity,water content of pressboard and aging status,are systematically discussed using XY model simulation.Results show that a＂hump＂ can be observed in the frequency spectroscopy of tanδwhen the oil conductivity is relatively higher.The frequency relating to the maximum value of the＂hump＂shifts to higher with the increase of oil conductivity,but the maximum tanδvalues maintain the same.The frequency relating to the maximum value of the＂hump＂also shifts to higher values with the increase of X or Y value of the insulation structure,meanwhile the amplitude of the＂hump＂ decreases.As the aging proceeds,the frequency spectroscopy of tanδshifts to higher frequency.Therefore,a new way of aging-status diagnosis for transformer utilizing FDS is provided.

关 键 词：变压器 油纸绝缘 XY模型 频域介电谱 老化状态 介电响应 

分 类 号：TM855[电气工程—高电压与绝缘技术]