电路课件：第12章 三相电路

1、)120tcos(U2)t (u)120tcos(U2)t (utcosU2)t (uoCoBA )0( ,0UUoA 0UUU0uu uCBACBA A UCUBUBAUUA2oBU120UU AoCU120UU A UB UC UA UB UC UBAUBCUCA UCACB BAU,U,U CBAU,U,U NCNBNAUUU CZBYAXUUU BABNANBAUUUUU CBCNBNBCUUUUU ACANCNCAUUUUU A UB UC UABU21BNU BA UNA UBN UCN UBC UCA U 30UUU3UBNBCBNBC超超前前且且 30UUU3UCNCACNCA

2、超超前前且且3plU3U 30UUU3UU23Usin60U21ANABANABANANAB超前超前且且BABNANBAUUUUU CBCNBNBCUUUUU ACANCNCAUUUUU oNABA30U3U ;U3U ,3 )2(pl 即即倍倍的的线线电电压压大大小小等等于于相相电电压压）（）（）（CCNCABBNC BAANB AUUUUUUUUU oNBCB30U3U oCNCA30U3U ANUABUNA UBN UCN UBA UBC UCA UBNU BA UBC UCA UNA UBN UCN UB UC UA UA UB UC UoCoBoA120UU 120UU 0UU 设设

3、oCCAoBCBoABA120UUU120UUU0UUU B UC UA UBA UBC UA IB IC ICA UA UB UC U I0UUUCBA CCBAU2UUU A UB UC U IC U总总 UA IB IC IN ICBAIII,ANiCNiBNiCNBNANIII 、AiCiBiCBAIII 、ANiCNiBNiCNCBNBANAIIIIII NiAiCiBiCNBNANNIIII NI3BNUANUCNUABUBCUCAUANUABUCNUBNUCAUBCU 30 U3U30 U3UCNCABNBC 30U3UANABA IB IC IBAI CBI ACI CBACC

4、BACBBACBAAIIIIIIIII CBAIII,ACCBBAI ,I ,ICBACCBACBBACBAAIIIIIIIII A UB UC UA IB ICIBAIACICBIBABAAI23cos30II2130III3IBAABAA滞后滞后且且30ACIBAICBIA IACI_。AI21 ACBAAIII 30III3I 30III3I ACCACCCBBCBB 滞后滞后且且滞后滞后且且同理：同理： 3plI3I 30I3I30I3I30I3IACCCBBBAA3A UB UC UA UB UC UY-CBAI ,I ,I CBAI ,I ,I BN UCN UB IC INA U

5、A INNU 0)Z1ZZ3(ZZ1UUUUN11CBANN ）（BN UCN UB IC INA UA IlCClBBlAAZZUIZZUIZZUI BN UCN UB IC INA UA INA UA I 120II120IIACAB0IIIICBAN AIA UA IB IC IBUCUNA UBN UCN UA IB IC IoCACNoBCBNoABAN30U31U30U31U30U31U ANU BNU CNU BA UBC UCA UBCU CAU ABU BA UBC UCA UV03220V 0380oANoAB UU则则设设NA UA IA IB IC INA UBN UC

6、NUV 2 .368 .1369 .3681 .731 .17ZIUoooANA V 2 .69 .236V 2 .68 .136330U3UoooNABA A9 .461 .17IA9 .1661 .17IoCoB NA UA I V8 .838 .136UV2 .1568 .136UoNCoNB V8 .1139 .236UV 2 .1269 .236UoACoCB j8.89.4 03220ZZUIolANA A3.171 .1743.188.12 03220 ooo V30380UAB V0220UA A UB UC UA IB ICIBAIACICBINA UA Ij4.86.4j4

7、30220ZZUIlAA A163.217.1IB NA UA IBN UCN UB IC I8 .4j4 .63ZZ A76.817.1IC A43.217.1 V3 .969 .236UCB 30U3U:NABA 则则V6.3136.8ZIUANA V7 .1439 .236UAC V23.7236.9306.3136.83 NA UA IA2 .139 .9303IIAAB 30-I3IBAAA2 .1339 .9IBC A8 .1069 .9ICA A UB UC UA IB ICIBAIACICBIA UB UC UA IB ICIBAIACICBIV30380UUoBAAB A2

8、.139 .9ZUIABAB A43.217.130-I3IBAA plII 线线电电流流等等于于相相电电流流，即即。 0 0且且线线电电流流滞滞后后相相电电流流3 3即即倍倍, ,3 3的的线线电电流流大大小小等等于于相相电电流流 plI3I。 0 0且且线线电电压压超超前前相相电电压压3 3即即 倍倍, ,3 3的的线线电电压压大大小小等等于于相相电电压压 plU3U plUU 即即 线电压等于相电压,线电压等于相电压, AI AI IA ANU ANU AI AI AI32Z3/2Z1 .53,6 .0cos11 8j61 .5310Z1 350jZ31Z22 A6 .17j2 .13A

9、13.532213.53100220ZUIooo1ANA A2 .13j3/50j0220ZU Io2ANA A4 .189 .13 IIIoAAA A4 .1389 .13IoB ANU AI AI AI32Z V30380U:设oAB V 0220U:则oAN A6 .1019 .13IoC A1 .5322IoA A1202 .1330 I31IooA2AB +_+NACBZ1Z2ZNN AI AI AI ANUAB2IBC2ICA2I+_Z1 ANU AI AI IA32ZoB1 .17322I A9 .6622IoC A02 .13I o2BC A1202 .13Io2CA 0Z/1

10、Z/1Z/1Z/UZ/UZ/UUcbacCNbBNaANNN NNCNCNNNBNBNNNANAN UUUUUUUUUAN UCN UBN UNA UBN UCN UNN UNA UBN UNC UNA UBN UCN UNN UNA UBN UNC UAN UCN UBN U0Z/1Z/1Z/1Z/UZ/UZ/UUcbacCNbBNaANNN 0IIIICBAN 0NNU 强迫强迫0IIIICBAN A UB UC U例：例：ZZZA1A2A3S解：解：A89. 23/5 V 7638051U3R V 30438054U2R V220380PlUU*PPIUSP *PPIU3S LLIU3I3UPP )tcos(I2itcosU2u AA 设设 )t2(cos cosUI )t(osc tcosUI2iup AAA )120tcos(I2i )120tcos(U2u BB 则则 )240t2(cos cosUI )120t(osc )120tcos(UI2iup BBB )120tcos(I2i )120tcos(U2