变压器油纸绝缘极化谱的仿真研究  

Simulation of transformer insulation polarization spectrum

作　　者：江修波[1] 张涛[2] 黄彦婕[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350002 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电力自动化设备》2011年第2期31-35,共5页Electric Power Automation Equipment

基　　金：福建省自然科学基金资助项目(2010J01283)~~

摘　　要：回复电压测量方法能有效检测变压器固体绝缘的含水量,然而对于含有局部峰值点的回复电压极化谱,难以给出明确的诊断结论。在引入扩展德拜模型基础上,建立了绝缘极化、老化过程和等值电路参数三者之间的关系,并仿真分析了电路参数的改变引起特征量和极化谱的变化规律。仿真分析结果表明,回复电压特征量的主时间常数能诊断不同几何电容的变压器的绝缘状态,是一个诊断绝缘状态的有效特征量;而且极化谱的形状也是诊断绝缘状态的有效特征量,其终端部分的形状和回复电压值能反映固体绝缘的老化状态。试验研究结果证明仿真结论是有效的。The return voltage measurement can effectively detect the moisture content of solid insulation in transformer,but it is difficult to get the definite diagnostic results from the return voltage polarization spectrum with local peaks. The theory of extended Debye model is introduced,the relationship among insulation polarization,aging process and equivalent circuit parameter is established,and the variation law of characteristic variables and polarization spectrum induced by the variation of electric parameters are simulated and analyzed. Simulative results show that,the dominant time constants can diagnose the insulation conditions of transformers with different geometric capacitances,which is an effective characteristic variable. The shape of polarization spectrum is also an effective characteristic variable of insulation diagnosis. The shape of its terminal part and its return voltage can reflect the aging condition of solid insulation. Test results validate the effectiveness of simulation conclusions.

关 键 词：回复电压 绝缘诊断 老化 电力变压器 极化谱 

分 类 号：TM855[电气工程—高电压与绝缘技术] TP391.9[自动化与计算机技术—计算机应用技术]