有一台型号为SFS-40000/220的三相三绕组变压器，容量比为100/100/100，额定变比为220/38.5/11，查得△P0=46.8kW

(1)各绕组的等值电阻
△P[_s1=\frac{1}{2}(△P_s(1-2)+△P_s(1-3)一△P_s(2-3))=\frac{1}{2}(217+200.7-158.6)kW=129.55kW</span>]
△P[_s2=\frac{1}{2}(△P_s(1-2)+△P_S(2-3)-△P_s(1-3))=\frac{1}{2}(217+158.6-200.7)kW=87.45kW</span>]
△P[_s3=\frac{1}{2}(△P_s(1-3)+△P_s(2-3)-△P_s(1-2))=\frac{1}{2}(200.7+158.6-217)kW=71.15kW</span>]
R[₁=\frac{△P_s1V_{N}^{2}}{S_{N}^{2}}×10³Ω=\frac{129.55×220^2}{40000^2}×10₃Ω=3.919Ω</span>]
R[₂=\frac{△P_s2V_{N}^{2}}{S_{N}^{2}}×10³Ω=\frac{87.45×220^2}{40000^2}×10^3Ω=2.645Ω</span>]或 R[₂=R₁\frac{△P_s2}{△P_s1}=3.919×\frac{87.45}{129.55}Ω=2.645Ω</span>]
R[₃=R₁\frac{△P_s3}{△P_s1}=3.919×\frac{71.15}{129.55}Ω=2.125Ω</span>]
(2)各绕组的等值电抗
V[_s1%=\frac{1}{2}(V_s(1-2)%+V_s(1-3)%-V_s(2-3)%)=\frac{1}{2}(17+10.5-6)=10.75</span>]
V[_s2%=\frac{1}{2}(V_s(1-2)%+V_s(2-3)%-V_s(1-3)%)=\frac{1}{2}(17+6-10.5)=6.25</span>]
V[_s3%=\frac{1}{2}(V_s(1-3)%+V_s(2-3)%-V_s(1-2)%)=\frac{1}{2}(10.5+6-17)=-0.25</span>]
X[₁=\frac{V_S1%}{100}×\frac{V_{N}^{2}}{S_N}×10³=\frac{10.75}{100}×\frac{220²}{40000}×10³Ω=130.075Ω</span>]
X[₂=X₁×\frac{V_S2%}{V_S1%}=130.075×\frac{6.25}{10.75}Ω=75.625Ω</span>]
X[₃=X₁×\frac{V_S3%}{V_S1%}=130.075×\frac{-0.25}{10.75}Ω=-3.025Ω</span>]
(3)变压器的导纳
G[_T=\frac{△P₀}{V_{N}^{2}}×10^-3=\frac{46.8}{220²}×10^-3S=9.669×10^-7S</span>]
B[_T=\frac{I₀%}{100}×\frac{S_N}{V_{N}^{2}}×10^-3=\frac{0.9}{100}×\frac{40000}{220²}×10^-3S=74.38×10^-7S</span>]