2、从星形连接变换为三角形连接 12 2=R1-i2R2 R 12 R 31 12 R-iR 12 R 31K12 2 i+i2+23=0 2 23 2 R R342-R231由等效概念有 Ru2 rrrr+RR R RR2+r2R3+R3R 变换式:R2=R+凡2+kE R31 rr2+rR+RR R R31=B+R⊥R3R1 RR R23=R,+R3+ R R2、从星形连接变换为三角形连接 变换式： 12 1 1 2 R2 u = i R −i R2 R3 R31 R23 R12 R1 3 1 2 12 1 2 R R R R = R + R + 2 3 1 3 1 3 1 R R R R = R + R + 23 2 2 3 R3 u = i R −i i 1 +i 2 +i 3 = 0 1 2 2 3 3 1 3 1 2 2 3 1 1 R R R R R R R u R u i + + − = 31 31 12 12 R u R u = − 由等效概念,有 1 2 2 3 3 1 3 1 2 1 R R R R R R R R + + = 1 2 2 3 3 1 2 3 1 1 R R R R R R R R + + = 1 2 3 2 3 2 3 R R R R = R + R +