变压器故障在线监测系统的设计

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1、中国石油大学（华东）硕士学位论文变压器故障在线监测系统的设计姓名：李金龙申请学位级别：硕士专业：控制工程指导教师：陈继明20091001摘要电力变压器作为电力系统一种最重要的设备之一，它的运行可靠性直接影响到电力系统的运行安全。设计的目的是检测溶解于变压器油的气体成分并且诊断变压器是否存在故障，这样可以提高变压器的可靠性。首先，本文介绍了变压器故障诊断的现状及发展；其次，讨论了变压器运行中油中溶解气体和内部绝缘的关系和变压器故障诊断的常用方法。I-IBW硬件组成是基于MQ系列气敏传感器，SST51单片机，AD转换器等这些能实时采集变压器油中溶解气

2、体浓度的设备。软件部分是用VC完成串行通信和可视化接口，它可以从单片机接收数据，为系统建立能够存储数据并且可以绘图的数据库。用其它的气体仿真溶解于变压器油的气体，测试显示在线监测系统能够实时收集并精确的传输数据，在实验室条件下诊断变压器的运行状态和故障。通过气体在线监测，解决了传统判断故障周期长的难题同时有效避免事故范围的扩大和减小了恶性事故发生的机率。关键词：变压器，油中溶解气体，在线监测，单片机，串行通信，数据库TheDesignofOn—lineMonitoringSystemofTransformerFaultLiJinlong(Cont

3、rolTheoryandControlEngineering)DirectedbyAssociateProf．ChenJimingAbstractoperationreliabilityofthepowertransformerastheolleofthemostimportantequipmentsinelectricalpowersystems，influencesoperationsecurityofelectricalpowersystemsdirectly．Thepurposeofthedesignistodetectthecompon

4、entsofgasesdissolvedintransformeroilanddiagnosewhetherthetransformerexiststhefaults，whichcanimprovethereliabilityofthetransformer．Atfirst，thispaperintroducedthecurrentsituationofthetransformerfaultdiagnosisanditsdevelopment．Thenittalkedabouttherelationbetweenthegasesdissolved

5、intransformeroilandtheinternalinsulationfaultsofoperatingtransformer,aswellasthecommonmethodsfordiagnosingthefaultsofthetransformer．TheI-IBWhardwarecomponentsarebasedontheseriesofMQgassensor,SST51single—chipmicrocomputer,ADconverterwhichcancollecttheconcentrationofthegasesdis

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7、dintransformeroil．Testsshowthattheon—linemonitoringsystemcarlcollectdatainrealtime，transferthedataaccuratelyanddiagnosetherunningstateandthefaultsofthetransformerunderlaboratoryconditions．Usedthegason—linemonitoring，thispapersolvedadifficultwhichusedtobeneedlongperiodtojudget

8、hefaultsSOeffectivelyavoidtheaccidentsenlargementandreducetheriskofm