三相變壓器實(shí)驗(yàn)報(bào)告

第四次實(shí)驗(yàn)報(bào)告——三相變壓器實(shí)驗(yàn)內(nèi)容1測(cè)定變比1.1實(shí)驗(yàn)拍照、數(shù)據(jù)、圖表U（V）KUVU（V）KVWU（V）KWUK=1/3(KUV+KVW+KWU)U1U1.1V1U2U1.2V1U1V1.1W1U2V1.2W1U1W1.1U1U2W1.2U14281083.964151053.954081043.923.941.2實(shí)驗(yàn)結(jié)果分析與理解由空載實(shí)驗(yàn)測(cè)取變壓器的原、副方電壓的三組數(shù)據(jù)，分別計(jì)算出變比，然后取其平均值作為變壓器的變比K。K=U1U1.1U2／U2U1.2U2實(shí)驗(yàn)內(nèi)容2空載實(shí)驗(yàn)2.1實(shí)驗(yàn)拍照、數(shù)據(jù)、圖表序號(hào)實(shí)驗(yàn)數(shù)據(jù)計(jì)算數(shù)據(jù)U0(V)I0(A)PO(W)UO(V)IO(A)PO(W)cos0U2U1.2V1U2V1.2W1U2W1.2U1I2U10I2V10I2W10PO1P02157.2157.3557.280.0110.0100.0190.320.2257.280.0130.540.492277.0177.2477.090.0180.0170.0240.590.4477.110.0201.030.383398.5597.9597.450.0220.0250.0300.980.7897.980.0261.760.3704109.8108.4109.10.0250.0280.0341.261.57109.10.0292.830.3325115.2113.7113.40.0260.0290.0351.391.69114.10.0303.080.2466131.7130.7130.10.0310.0350.0411.901.93130.80.0363.830.1742.2實(shí)驗(yàn)結(jié)果分析與理解空載時(shí)變壓器的損耗主要由兩部分組成，一部分是因?yàn)榇磐ń蛔兌阼F心中產(chǎn)生的鐵耗，另一部分是空載電流在原繞組中產(chǎn)生的銅耗。由于空載電流數(shù)值很小，此時(shí)銅耗便可以略去，而決定鐵耗大小的電壓可達(dá)到正常值，故近似認(rèn)為空損耗就是變壓器的鐵耗，但實(shí)質(zhì)上二者并不等價(jià)實(shí)驗(yàn)內(nèi)容3短路實(shí)驗(yàn)3.1實(shí)驗(yàn)拍照、數(shù)據(jù)、圖表θ=26℃序號(hào)實(shí)驗(yàn)數(shù)據(jù)計(jì)算數(shù)據(jù)UK（V）IK（A）PK（W）UK（V）IK（A）PK（W）cosKU1U1.1V1U1V1.1W1U1W1.1U1I1U1I1V1I1W1PK1PK21141312.50.230.220.200.462.7413.20.223.200.638220.519.5190.320.310.300.925.7819.670.316.700.634322.522.023.00.370.340.351.167.4922.500.358.650.634425.024.527.00.430.360.401.439.4525.500.4010.880.616526.525.029.00.460.370.441.6711.7626.830.4213.430.6883.2實(shí)驗(yàn)結(jié)果分析與理解由于短路實(shí)驗(yàn)所加電壓很低，因此這時(shí)鐵心中磁通密度很低，故鐵心損耗可以略去，而決定銅耗大小的電流可達(dá)正常值，所以近似認(rèn)為負(fù)載損耗就是變壓器銅耗。但仍然只是一種近似。實(shí)驗(yàn)內(nèi)容4純電阻負(fù)載實(shí)驗(yàn)4.1實(shí)驗(yàn)拍照、數(shù)據(jù)、圖表UUV=U1N=55V；cosj2=1序號(hào)U（V）I（A）U1U1.1V1U1V1.1W1U1W1.1U1U2I1U1I1V1I1W1I2121821022821900002204197214205131212123198190208199191818184188180196188302829295177169185177403840394.2實(shí)驗(yàn)結(jié)果分析與理解純電阻負(fù)載時(shí)，變壓器各端電壓與電流成