2015年第43卷第5期 2015,Vol.43No.5
陕西电力
SHAANXI ELECTRICPOWER
电网技术 Grid Technology
基于油浸变压器故障数据的IEC三比值统计分析
蒲丽娟，刘念，刘航宇，王贺新，李娟
（四川大学电气信息学院，成都610065)
摘要：IEC三比值法广泛应用于油漫变压器的早期绝缘故障诊断，但却一直存在判断失准间题。通过收集现场1750余合油浸变压器的故障数据并按不同故障类型进行统计分类，将IEC三比值法中的3组比值按比值区间分布情况进行讨论，结合不同故障下的气体生产机理阐明敏障与比值间的联系，进而通过对比分析比值诊断结果与实际故障类型得出正判率和漏判率。研究阐明了油浸变压器的故障统计特征，指出了应用EC三比值
法诊断存在的问题以及容易出现诊断失效的比值区间，对于油浸变压器的现场故障分析具有一定意义。关键词：油浸变压器；变压器油；比值法；故障诊断；正判痛判率；比值区间
中图分类号：TM411
文献标志码：A
文章编号：1673-7598(2015)05-0041-04
StatisticalAnalysisofIECThree-ratioMethodBasedonFault
DataofOil-immersedTransformers
PU Lijuan,LIUNian,LIUHangyu,WANG Hexin,LI Juan
(School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China)
Abstract: Threeratio method recommended by the Intemational Electrotechnical Commission(IEC) is widely used in the early fault diagnosis of oilimmersed transfomers. However, the inacuracy of this method has always been a big problem. The data collected from 1 750 oilimmersed transformers has been put into different categories based on the fault types. Discussions of the IEC three ratios will be carried out based on the interval of ratios. The relationship between faults and ratios interval will be analyzed by studying on the gas generating principles under different fault situations, After then, the result of ratio method diagnosis and real fault type shall be compared to get the correct rate and missing rate. Research in this paper illustrates statistical characteristics of oil-immersed transformer faults, It has been pointed out that the matters need attention in the application of IEC three ratios and the intervals in which misdiagnosis can easily arise in the conclusion, The research has a certain significance for the field fault analysis of oilimmersedtransformers
Key words: oilimmersed transformer; transformer oil; ratio method; fault diagnosis; correct rate and missing rate; ratio interval
方法1-}。关于应用这种比值法诊断油浸变压器的思
0
引言
当油浸变压器内部存在过热或放电故障时，将
加速变压器油的老化分解，导致油中溶解的气体含量发生变化。传统电气试验方法通常难以快速发现这些早期潜伏性故障。比值法是一种通过检测变压器油中溶解气体的含量，并进行气体间的比值分析来判断油浸式变压器内部早期潜伏性故障及其发展趋势的重要手段，被广泛应用于现场诊断。
IEC三比值法是一种成熟的油中溶解气体分析
基金项目：国家自然科学基金项目资助(61401075) 万方数据
路，国内外研究者进行了大量研究P-,然而IEC三比值法描述的故障性质和比值范围有限，很多情况无法准确判断，甚至无法诊断多种故障同时发生的情况门。就IEC三比值法的实际应用情况，通过合理地统计分析三比值法实际诊断效果，找出容易出现诊断失效的比值区间，对于油浸变压器的现场故障诊断分析具有一定意义。
本文基于国内外研究成果，通过统计多组油浸式变压器的故障分析结果及其油中溶解气体的比值数据，试图阐明C,H/C,H等比值与不同故障类型之间的对应关系，从现场诊断效果统计的角度分析 IEC三比值法的应用。