三相負(fù)載的三角形連接Triangleconnectionofthree-phaseload主講人：張捷123實(shí)驗(yàn)?zāi)康膶?shí)驗(yàn)原理實(shí)驗(yàn)器材ExperimentalPurposeExperimentalPrinciplesExperimentalEquipment45實(shí)驗(yàn)步驟數(shù)據(jù)分析ExperimentalStepsDataAnalysis目錄CONTENTS1實(shí)驗(yàn)?zāi)康腅xperimentalPurposeONE熟練使用儀表檢測(cè)電路中的電壓、電流等參數(shù)充分理解三相負(fù)載作三角形連接和星形連接的區(qū)別掌握三相負(fù)載作三角形連接的方法，驗(yàn)證三角形連接接法下，線、相電壓及線、相電流之間的關(guān)系實(shí)驗(yàn)?zāi)康腅xperimentalPurposeMasterthemethodoftriangularconnectionforthree-phaseloads,andverifytherelationshipbetweenline,phasevoltage,andline,phasecurrentunderthetriangularconnectionmethodLearntousecurrentplugsandsocketstomeasurethecurrentofeachbranchDeepenunderstandingofthesuperpositionlawoflinearcircuits2實(shí)驗(yàn)原理ExperimentalPrinciplesTWO實(shí)驗(yàn)原理ExperimentalPrinciples實(shí)驗(yàn)原理ExperimentalPrinciples把三相負(fù)載分別接在三相電源的每兩根端線之間的連接方式稱為三相負(fù)載的三角形連接Theconnectionmethodofconnectingthethree-phaseloadtoeachtwoterminalwiresofthethree-phasepowersupplyiscalledthetriangularconnectionofthethree-phaseload電壓的數(shù)量關(guān)系:UL=UPQuantitativerelationshipofvoltage:UL=UP電壓的相位關(guān)系:線電壓與對(duì)應(yīng)相電壓的相位相等Thephaserelationshipofvoltage:thephaseofthelinevoltageisequaltothecorrespondingphasevoltage三相負(fù)載對(duì)稱時(shí)有:Whenthethree-phaseloadissymmetrical,thereare:

電流的相位關(guān)系:線電流滯后對(duì)應(yīng)的相電流30°Phaserelationshipofcurrent:Thephasecurrentcorrespondingtothehysteresisofthelinecurrentis30°3實(shí)驗(yàn)器材ExperimentalEquipmentTHREE三相自耦調(diào)壓器Threephaseselfcouplingvoltageregulator交流電壓表（0~500V）ACvoltmeter(0-500V)交流電流表（0~5A）ACammeter(0-5A)萬用表multimeter插接導(dǎo)線若干Severalplug-inwires三相燈組負(fù)載(220V，15W白熾燈）Threephaselampgroupload(220V,15Wincandescentlamp)4實(shí)驗(yàn)步驟ExperimentalProcedureFOUR1Devicemeasurement器件測(cè)量實(shí)驗(yàn)步驟ExperimentalProcedure12Devicemeasurement器件測(cè)量實(shí)驗(yàn)步驟Voltageregulation電壓調(diào)節(jié)ExperimentalProcedure123Devicemeasurement器件測(cè)量實(shí)驗(yàn)步驟Voltageregulation電壓調(diào)節(jié)△Connecttobalancedload△接平衡負(fù)載ExperimentalProcedure電路連接圖Circuitconnectiondiagram123Devicemeasurement器件測(cè)量實(shí)驗(yàn)步驟Voltageregulation電壓調(diào)節(jié)△Connecttobalancedload△接平衡負(fù)載4△Connecttounbalancedload△接不平衡負(fù)ExperimentalProcedure數(shù)據(jù)記錄datarecord測(cè)量數(shù)據(jù)0Measurementdata開燈盞數(shù)Numberoflightson線電壓=相電壓(V)Linevoltage=phasevoltage(V)線電流(A)Linecurrent(A)相電流(A)Phasecurrent(A)負(fù)載情況LoadsituationA-B相A-BphaseB-C相B-CphaseC-A相C-AphaseUABUBCUCAIAIBICIABIBCICAY接B相斷開YtoBphasedisconnectionY接B相短路YtoBphaseshortcircuit測(cè)量數(shù)據(jù)Measurementdata開燈盞數(shù)Numberoflightson線電壓=相電壓(V)Linevoltage=phasevoltage(V)線電流(A)Linecurrent(A)相電流(A)Phasecurrent(A)負(fù)載情況LoadsituationA-B相A-BphaseB-C相B-CphaseC-A相C-AphaseUABUBCUCAIAIBICIABIBCICA三相平衡Three-phasebalance3332202202200.950.950.950.550.550.55三相不平衡Three-phaseimbalance1232202202200.310.620.930.180.360.55負(fù)載采用三角形連接和采用星形連接的區(qū)別?分析三相不對(duì)稱三角形連接的負(fù)載，能否正常工作?實(shí)驗(yàn)是否能證明這一點(diǎn)?數(shù)據(jù)分析dataanalysisWhatisthedifferencebetweenusingatriangularconnectionandastarconnectionfortheload?Analyzetheloadofthree-phaseasymmetrictriangularconnection,canitworknormally?Cantheexperimentprovethis?注意事項(xiàng)note本實(shí)驗(yàn)采用三相交流市電，線電壓為380V，實(shí)驗(yàn)時(shí)要注意人身安全，不可觸及導(dǎo)電部件，防止意外事故發(fā)生Thisexperimentusesathree-phaseACmainssupplywithalinevoltageof380V.Duringtheexperiment,attentionshouldbepaidtopersonalsafetyandconductivepartsshouldnotbetouchedtopreventaccidentsfromoccurring;嚴(yán)格遵守先斷電、再接線、后通電；先斷電、后拆線的實(shí)驗(yàn)操作原則Strictlyadheretotheprincipleoffirstpoweringoff,thenwiring,andthenpoweringon;Theexperimentaloperationprincipleoffirstdisconnectingthepowerandthendisconnectingthewires在檢測(cè)相電流時(shí)，注意電流表接的位置在圖中所示位置，否則會(huì)影響檢測(cè)結(jié)果Whendetectingphasecurrent,payattentiontothepositionoftheammeterconnectionasshowninthefigure,otherwiseitwillaffectthedetectionresults.三相負(fù)載根據(jù)什么條件作星形或三角形連接?如兩臺(tái)額定電壓不同的三相電動(dòng)機(jī)(220Y、380△)接到相同的電源上，為什么都可以正常工作呢?

Underwhatconditionsarethree-phaseloadsconnectedinastarordeltamanner?Whycantwothree-phasemotorswith