ABBDI620(3BHT300002R1)电动机是由定子（固定部分）和转子（转动部分）两个基本部分组成，它们之间由气隙分开。异步电动机的外形见图片，异步电动机分为鼠笼式电动机和绕线式电动机两种。参见鼠笼式电动机模型定子结构1、机座：用铸铁或铸钢制成的，起支撑作用。2、定子铁芯：是由内圆周表面均匀冲有槽孔的圆环形硅钢片叠压而成的圆筒，因而，在铁芯内圆周上形成了均匀分布的轴向线槽，用来放置定子绕组。定子绕组：用带有绝缘***的导线（如漆包铜线等）绕成匝数相同的线圈，再分三组按一定的规律将线圈对称放置在定子铁芯的轴向线槽内，其中每一组称为一相绕组，这就成为三相对称绕组U1U2，V1V2，W1W2。根据电源的线电压和每相绕组的额定电压，定子绕组可接成Y形或△形。定子的作用：产生旋转磁场，并从电网吸收电能。转子结构1、转轴2、转子铁芯：是由外圆周表面冲有槽的硅钢片叠成的圆柱体，装在转轴上3、转子绕组：放置在转子铁芯槽内，有两种形式：鼠笼式，绕线式。200-IB16ABBAdvantOCS接地变压器按接线方式分为ZNyn接线（Z型）或YNd接线两种，其中性点可接人消弧线圈或接地电阻接地。现在多采用Z型（曲折型）接地变压器经消弧线圈或小电阻接地。1．Z型接地变压器的概述Z型接地变压器有油浸式和干式绝缘两种，其中树脂浇注式是干式绝缘的一种，其在结构上与普通三相芯式电力变压器相同，只是每相铁芯上的绕组分为上、下相等匝数的两部分，然后把每一相绕组的末端与另一相绕组的末端反接串联。两段绕组极性相反，组成新的一相，接成曲折形连接，将每相上半部绕组首端U1、V1、W1引出来分别接A、B、C三相交流电，将下半部首端U2、V2、W2连在一起作为中性点接相应的接地电阻或消弧线圈，如图所示。Z型接地变压器按接线方式不同，又分为ZNvn1和ZNyn11两种形式。Z型接地变压器还可装有低压绕组，接成星形中性点接地(yn)等方式，作为站用变压器使用。图Z型接地变压器与小电阻或消弧线圈接线方式2．Z型接地变压器的优点Z型变压器曲折接法的优点：①在单相短路时，接地电流在三相绕组中大致均匀分配，每个柱上的两个绕组的磁势相反，所以不存在阻尼作用，电流可以畅通地从中性点流向线路；②绕组相电压中无三次谐波分量，因为曲折联结的三单相变压器组，因三次谐波特点是向量同方向同大小，因绕制方法，则每相中三次谐波电动势互相抵消，相电动势接近正弦波。Z型接地变压器同一铁芯柱上两半部分绕组中的零序电流方向是相反的，因此零序电抗很小，对零序电流不产生扼流效应。其降低零序阻抗的原理是：在接地变压器三相铁芯的每一相都有两个匝数相等的绕组，分别接不同的相电压。当接地变压器线端加入三相正、负序电压时，接地变压器每一铁芯柱上产生的磁通势是两相绕组磁通势的相量和。单个铁芯柱上的合成磁通势相差120°，是一组三相平衡量。单相磁通势可在三个铁芯柱上互相形成磁通路，磁阻小，磁通量大，感应电动势大，呈现很大的励磁阻抗。当接地变压器三相线端加零序电压时，在每个铁芯柱上的两个绕组中产生的磁通势大小相等，方向相反，合成的磁通势为零，三相铁芯柱上没有零序磁通势。零序磁通势只能通过外壳和周围介质形成闭合回路，磁阻很大，零序磁通势很小，所以零序阻抗也很小。ABBPM645AABB200-APB12ABB200-IT8ABBCI810AABBCI810V2ABBDFM02ABBRAIO-01ABBTU830ABBDSDO131ABBDSDO115ABBDSAX452ABBCI627200-BPN492897301200-C1485G492897601200-CICN492897801200-CIE492897701200-P***G4928988013BSC950019R1TK520V0303BSC950055R1TK576V0503BSC950056R1TK576V1153BSC950073R273BSC950098R13BSE016239R1PM510V083BSE016240R1PM510V16AI6203BHT300005R1AI6253BHT300036R1AX6703BSE000566R1CI520V13BSE012869R1CI5223BSE012790R1CI522A3BSE018283R1CI5263BSE006085R1CI532V023BSE003827R1CI532V043BSE003829R1CI5403BSE001077R1CI5603BUC98002R0001CI5703BSE001440R1CI6103BHT300003R1CI615K013BSE000756R1CI6303BSE011000R1CI630K023BSE011002R1CI6703BHT300017R1CI810B3BSE020520R1CI820-23BSE013202A1CS5123BUR980009R1CS5133BSE000435R1CS513K023BSE004773R1CS513K043BSE055760R1DI6213BHT300012R1DO6103BHT00006R1DO6303BHT300007R1DSAI13357120001-PSDSAI11057120001-DPDSAI13057120001-PDSAI1455712001-HADSAI1463BSE007949R1DSAI15557120001-HZDSAI155A3BSE014162R1DSAO11057120001-ATDSAO13057120001-FGDSAO12057120001-EYDSAO120A3BSE018293R1DSBC17257310001-KD/5DSBC17357310001-KHDSBC173A3BSE005883R1DSCS14057520001-EVDSDI110A57160001-AAADSDO12057160001-AKDSDO11057160001-KDSDP15057160001-GFDSDX1803BSE003859R1DSDX180A3BSE018297R1DSDX4525716075-PDSP***5257310303-ADSPU1313BSE000355R1DSRF1993BSE019299R1DSRF1853BSE004382R1DSRF1863BSE004383R1DSRF1873BSE004985R1DSRF187A3BSE014452R1DSSR17048990001-PCDSSS1713BSE005003R1DSTA00157120001-PXDSTA001B3BSE018316R1DSTA002B3BSE018317R1DSTA13157120001-CVDSTAN0133BNP000177R1DSTA002P3BSE018331R1DST***0657520001-DX/1DST***525751017-A/2DSTD10857160001-ABDDSTD1903BSE004723R1DSTD1973BSE004726R1DSTX1803BUR980025R1GJR5250000R035307KR91BGJR5251000R030307KP90GJR5251063P1GJR5251400***0207DC91GJR5251500R110107MK92GJR5252100R010107KT94CI8603BSE032444R1CI860K01AI8353BSE008520R1AI835A1SBP260052R1001ICMK14N11SNA645524R2300OBROC200-IA8S200-IA8200-IE8490176097S200-IE8200-TB3T490176065200C-IB10xOB6P492960133200C-IB16492933501200C-IE8492933801200C-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-13BSE013201A1CI820V13BSE025255R1CI8303BSE013252R1CI8403BSE022457R1CI840A3BSE041882R1CI8543BSE025347R1CI854A3BSE030221R1CI854AK013BSE030220R1DI210492953401DI8013BSE020508R1DI8023BSE022360R1DI8033BSE022362R1DI8103BSE008508R1DI8113BSE008552R1DI8143BUR001454R1DI8203BSE008512R1DI8213BSE008550R1DI821Z3BSE035380R1DI8303BSE013210R1DI8313BSE013212R1DI8403BSE020836R1DI8853BSE013088R1DI8903BSC690073R1DO210492953501DO8013BSE020510R1DO8023BSE022364R1DO8103BSE008510R1DO8143BUR001455R1DO8153BSE013258R1DO8203BSE008514R1DO8213BSE013250R1DO8403BSE020838R1DO8903BSC690074R1DP8203BSE013228R1DP8403BSE028926R1EI803F3BDH000017R1EI813F3BDH000022R1FI810F3BDH000030R1FI820F3BDH000031R1FI840F3BDH000033R1LD800HSE3BDH000320R02PM803F3BDH000530R1P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