最新电动机保护器的保护原理教学讲义ppt.ppt

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1、电动机保护器的保护原理电动机保护原理   电机故障的类型有多种，主要故障原因为定子过热烧坏。分析其损坏原因采用相应的保护措施。传统的电机保护算法主要是采用检测三相电流的幅值，并与限定值进行比较，然后做出相应的处理。其做法现已逐渐被摒弃，现在多采用对不对称故障判断更加敏感与准确的对称分量法，因为对称分量中的负序分量和零序分量只有在发生故障时才会产生。Task3-IIPoundsn.英镑Detailedadj.详细的Endn.末尾Stolev.偷走（过去式）Issuev.颁发Betteradj/adv.更好Hap

2、penedvi.发生（过去式/过去分词）Reportv.报告Stolenv.偷走（过去分词）Wrongadj.错误的，有问题的Task3-IWhataretheytalkingaboutinthedialogue对话?WhatproblemsdoesBaiMeiface面临?WhatareMolly’ssuggestions建议toBaiMei?BaiMei’shandbag手袋wasstolen,nowsheistalkingaboutthistoMolly.What’s(1),darling?Somethi

3、ngawful可怕的(2).WewenttoPortobelloRoad,andsomeone(3)myhandbag.Oh,dear.Wastherealotofmoneyinyourbag?No.Only(afew)一些(4).Butmypassport护照wasinit.That’swhatI’mreally确实(worriedabout)担心的.You(haveto)必须telltheembassy大使馆aboutit.AndIfindthey’ll(5)youwithanewone.I’d(6)got

4、omorrow.Yeah,youmustn’t绝对不可以leaveittoolong.Didyou(7)ittothepolice?No,Icouldn’tfindapoliceman.Well.Youmustreportthatyourhandbagwas(8),andgivethepolicea(9)description描述ofyourbag.You’dbettergotothelocal当地的policeStation（警察)局tomorrow.yes.I’lldoittomorrow.AndBaiMe

5、i…Yes?Don’tbetooupset难过的.It’snotthe(10)oftheworld.Task3-IIIAwful可怕的Embassy大使馆Issue颁发Description描述Local当地的Upset难过的Circulate流通ordistribute分发orequip配备withRelating与…相关的toacityortownordistrict地区Verybadorunpleasant不令人愉快的Afeeling感觉ofanxiousness焦虑Astatement陈述thatrep

6、resents表示somethinginthewordsAdiplomatic外交的building建筑whereambassadors大使liveorworkTask4-IWrist手腕n.Robbedv.抢劫（过去式/过去分词）Pushedv.推动Exactlyadv.确切地Expectingadj.期待的Wiseadj.明智的Knockedv.敲打（过去式/过去分词）Leavingv任凭Promisen./v.承诺Regretn/v.后悔LiuHuiistalkingtothepoliceaboutaro

7、bbery抢劫.Goodevening,sir.Iunderstandthatyouhavebeen(1).Icertainly当然have.Whendidthishappen发生?Abouttwohoursago.Pleasetellme(2)whathappened.Iwassittinginthisroomwatchingtelevisionwhensomeone(3)onthedoor.Without没有thinking,Iopenedit.Thatwasn’tvery(4),sir.Iknow.Iwa

8、s(5)mywife,yousee,andthought以为itwasher.Youshould应该never从不openadoorwithoutlookingtoseewhoitis.Yes,Iknow.I(6)itverymuch.Then,whathappened?Twomen(7)intotheapartment套间.Oneofthemthreatened威胁mewithakn