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型号为S-750/10的三相变压器,额定电压为10/0.4kV,Yd联接.在低压侧做空载实验:U20=400V,I0=65A,p0=3.7KW.在高压侧做短路实验:Ush=450V,Ish=35A,psh=7.5kW,室温30℃,求变压器T形等效电路的各参数.(设R1=R2′,Xσ1= Xσ2′)R1=R2'=1.02 X01=X02'=3.569 Rm=182.5 Xm=2213_液晶高压板变压器型号

归算到高压侧的参数:
额定相电压:U1 = 10/ 根号3 = 0.5774 KV    U2 = 0.4KV     K= U1 / U2 =14.435
空载时相电压 U2e = 400 V   相电流I2e = 65/ 根号3 = 37.53 A    
相损耗 P0e= 3700/ 3 =1233.3W 
励磁参数:Zm2 = U2e / I2e  = 10.66 欧   Rm2 = P0e / I2e * I2e = 0.88  欧 
                         Xm2 = (Zm2 * Zm2 - Rm2 * Rm2)^0.5 = 10.62
归算到高压侧:Zm = 10.66 * 14.435 *14.435 = 2221.22欧
                         Xm = 10.62 * 14.435 *14.435 = 2212.88欧
                        RM = 0.88 * 14.435*14.435 = 183.36欧
短路相电压 Uk = 450 / 根据号3 =260 V
短路相电流 I k = 35 A
短路相损耗 Pk = 7500 /3 = 2500 W
Zk = Uk / Ik = 7.43 欧
Rk = Pk / Ik * Ik = 2.04欧     
Xk =( Zk*Zk - Rk*Rk)^0.5 = 7.14欧
换算到75度:K1 = (235+75)/(235+30) = 1.17
RK1 = Rk * K1 = 2.39 欧
Zk1 = (RK1 *  RK1 + Xk * Xk )^0.5 = 7.53欧

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