《电路》（英文版）12-1 Three-phase voltages

8 12-1 Three-phase voltages D 44 y. sin ot B,= y sin(O-120°) B S nsin(ar-240°) =nsin(ot+120°) D ⊥4 BBY CC A=V∠0° VBF=∠-120° Icc,=V∠+120° BB

§12-1 Three- phase voltages V t  AA' = m sin sin( 120 ) '   BB =Vm t − sin( 120 ) sin( 240 ) '      = + = − V t V t m CC m  t  AA'  BB'  CC'  ' = 0 • V AA V  ' =  − 120 • V BB V  ' =  + 120 • V CC V V AA' • V CC' • V BB' • •    • • A B ' C ' B C ' A  N S