三相负载的三角形连接Triangleconnectiono

三相负载的三角形连接Triangleconnectionofthree-phaseload主讲人：张捷123实验目的实验原理实验器材ExperimentalPurposeExperimentalPrinciplesExperimentalEquipment45实验步骤数据分析ExperimentalStepsDataAnalysis目录CONTENTS1实验目的ExperimentalPurposeONE熟练使用仪表检测电路中的电压、电流等参数充分理解三相负载作三角形连接和星形连接的区别掌握三相负载作三角形连接的方法，验证三角形连接接法下，线、相电压及线、相电流之间的关系实验目的ExperimentalPurposeMasterthemethodoftriangularconnectionforthree-phaseloads,andverifytherelationshipbetweenline,phasevoltage,andline,phasecurrentunderthetriangularconnectionmethodLearntousecurrentplugsandsocketstomeasurethecurrentofeachbranchDeepenunderstandingofthesuperpositionlawoflinearcircuits2实验原理ExperimentalPrinciplesTWO实验原理ExperimentalPrinciples实验原理ExperimentalPrinciples把三相负载分别接在三相电源的每两根端线之间的连接方式称为三相负载的三角形连接Theconnectionmethodofconnectingthethree-phaseloadtoeachtwoterminalwiresofthethree-phasepowersupplyiscalledthetriangularconnectionofthethree-phaseload电压的数量关系:UL=UPQuantitativerelationshipofvoltage:UL=UP电压的相位关系:线电压与对应相电压的相位相等Thephaserelationshipofvoltage:thephaseofthelinevoltageisequaltothecorrespondingphasevoltage三相负载对称时有:Whenthethree-phaseloadissymmetrical,thereare:

电流的相位关系:线电流滞后对应的相电流30°Phaserelationshipofcurrent:Thephasecurrentcorrespondingtothehysteresisofthelinecurrentis30°3实验器材ExperimentalEquipmentTHREE三相自耦调压器Threephaseselfcouplingvoltageregulator交流电压表（0~500V）ACvoltmeter(0-500V)交流电流表（0~5A）ACammeter(0-5A)万用表multimeter插接导线若干Severalplug-inwires三相灯组负载(220V，15W白炽灯）Threephaselampgroupload(220V,15Wincandescentlamp)4实验步骤ExperimentalProcedureFOUR1Devicemeasurement器件测量实验步骤ExperimentalProcedure12Devicemeasurement器件测量实验步骤Voltageregulation电压调节ExperimentalProcedure123Devicemeasurement器件测量实验步骤Voltageregulation电压调节△Connecttobalancedload△接平衡负载ExperimentalProcedure电路连接图Circuitconnectiondiagram123Devicemeasurement器件测量实验步骤Voltageregulation电压调节△Connecttobalancedload△接平衡负载4△Connecttounbalancedload△接不平衡负ExperimentalProcedure数据记录datarecord测量数据0Measurementdata开灯盏数Numberoflightson线电压=相电压(V)Linevoltage=phasevoltage(V)线电流(A)Linecurrent(A)相电流(A)Phasecurrent(A)负载情况LoadsituationA-B相A-BphaseB-C相B-CphaseC-A相C-AphaseUABUBCUCAIAIBICIABIBCICAY接B相断开YtoBphasedisconnectionY接B相短路YtoBphaseshortcircuit测量数据Measurementdata开灯盏数Numberoflightson线电压=相电压(V)Linevoltage=phasevoltage(V)线电流(A)Linecurrent(A)相电流(A)Phasecurrent(A)负载情况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负载采用三角形连接和采用星形连接的区别?分析三相不对称三角形连接的负载，能否正常工作?实验是否能证明这一点?数据分析dataanalysisWhatisthedifferencebetweenusingatriangularconnectionandastarconnectionfortheload?Analyzetheloadofthree-phaseasymmetrictriangularconnection,canitworknormally?Cantheexperimentprovethis?注意事项note本实验采用三相交流市电，线电压为380V，实验时要注意人身安全，不可触及导电部件，防止意外事故发生Thisexperimentusesathree-phaseACmainssupplywithalinevoltageof380V.Duringtheexperiment,attentionshouldbepaidtopersonalsafetyandconductivepartsshouldnotbetouchedtopreventaccidentsfromoccurring;严格遵守先断电、再接线、后通电；先断电、后拆线的实验操作原则Strictlyadheretotheprincipleoffirstpoweringoff,thenwiring,andthenpoweringon;Theexperimentaloperationprincipleoffirstdisconnectingthepowerandthendisconnectingthewires在检测相电流时，注意电流表接的位置在图中所示位置，否则会影响检测结果Whendetectingphasecurrent,payattentiontothepositionoftheammeterconnectionasshowninthefigure,otherwiseitwillaffectthedetectionresults.三相负载根据什么条件作星形或三角形连接?如两台额定电压不同的三相电动机(220Y、380△)接到相同的电源上，为什么都可以正常工作呢?

Underwhatconditionsarethree-phaseloadsconnectedinastarordeltamanner?Whycantwothree-phasemotorswith