第39卷第10期2018年10月自 动 化 仪 表PROCESS AUTOMATION INSTRUMENTATION Vol．39No．10Oct.2018
收稿日期:2018-03-30作者简介:王汉林(1991 ),男,在读硕士研究生,主要从事变压器故障诊断方向的研究,E-mail:412348414@https://www.doczj.com/doc/593546346.html,;杨超(通信作者),女,学士,副教授,主要从事电力工程管理方向的研究,E-mail:2205209680@https://www.doczj.com/doc/593546346.html, 油中溶解气体分析的电力变压器故障诊断
王汉林,杨 超,唐 华
(贵州大学电气工程学院,贵州贵阳550025)
摘 要:电力变压器是电力系统不可或缺的组成部分,其故障将影响整个电力系统的正常二稳定运行,带来无法估量的损失三所以,准确监控其运行状态二及时诊断出潜在的故障显得尤为重要三溶解气体分析(DGA)通过比较电力变压器在正常运行状态下与发生故障状态下的油中溶解气体含量,检测并判断油浸式电力变压器故障三从算法原理及其优缺点等方面,对发生故障的油浸式电力变压器的诊断方法进行了研究三分析了当前普遍使用的IEC 三比值法的优缺点,并提出相关改进方法;详细介绍了不同的算法,并阐述其各自的优缺点;对各种算法作出总体评价,并根据各类算法的优缺点对其未来的发展方向作出相关预测三该研究对电力系统整体的安全二稳定运行具有十分重要的意义三
关键词:电力变压器;故障诊断;溶解气体分析;三比值法;人工神经网络;支持向量机
中图分类号:TH183;TP18 文献标志码:A DOI:10.16086/https://www.doczj.com/doc/593546346.html,ki.issn1000-0380.2018030048
Power Transformer Fault Diagnosis of Dissolved Gas Analysis in Oil
WANG Hanlin,YANG Chao,TANG Hua
(College of Electrical Engineering,Guizhou University,Guiyang 550025,China)Abstract :Power transformer is an indispensable component of the power system;its fault will affect the normal and stable operation of the entire power system and cause incalculable losses.Therefore,it is especially important to accurately monitor its operating status and diagnose potential faults in a timely manner.Dissolved gas analysis (DGA)is a method to detect and diagnose the failures of oil-immersed power transformer by comparing the dissolved gas content in oil in the normal and the failure states of the operations of power transformer.Based on the principle,advantages and disadvantages of the algorithm,the fault diagnosis method for oil-immersed power transformer is studied.The advantages and disadvantages of the currently commonly used IEC three-ratio method are analyzed and the improvement measures are proposed.Different algorithms are described in detail,and their advantages and disadvantages are analyzed.Overall evaluation of various algorithms is given,and their future development trend is predicted according to their advantages and disadvantages.The study is of great importance to the safe and stable operation of the whole power system.
Keywords :Power transformer;Fault diagnosis;Dissolved gas analysis;Three-ratio method;Artificial neural network(ANN);Support vector machine(SVM)0 引言
变压器是电力系统的枢纽,其安全二正常运行关系
到整个电力系统的有效运行三所以,对变压器发生的
故障作出及时二准确的判断具有重要的意义三目前,诊
断和检测油浸式电力变压器故障的主要方法有国际电
工委员会(International Electrotechnical Commission,
IEC)和我国国网公司推荐的油中溶解气体分析(dissolved gas analysis,DGA)三对变压器的运行和监
测研究结果表明,DGA 能够较早检测出变压器中发生的绝缘隐藏性故障三变压器中的甲烷二乙烷二氢气以及一氧化碳等物质是由于其中绝缘材料老化二绝缘油变质产生的,气体产生的速度和数量会随着变压器内部故障而发生改变(例如变压器内部发生过热或放电性故障,会加速这些气体的产生)三由于该方法不会受到外界电场和磁场的影响,可通过分析绝缘油中气体含量的方式找到气体含量与变压器故障之间的内在联系,从而实现对
万方数据