12线电压与相电压的关系 Y接 设U=UA=U∠0 ABIOCA B UBN=Ul=U∠-120° ×B B UCN=UC=U∠120 B C C BC C UAB= UAN U=U∠0-U∠-120°=3U∠30° UBC=UB-Uc=U∠-120°-U/∠120°=√3U∠-90° Uc4=UcUN=U∠120°-U∠0°=√3U∠150° BACK NEXTBACK NEXT 一、 Y接 11.2 线电压与相电压的关系 A + – X B C Y Z A B C N A • U B • U C • U AB • U BC • U CA • U A • I B • I C • I o CN C o B N B o AN A 120 120 0 = =  = =  − = =  • • • • • • U U U U U U 设 U U U o o o = − = 0 − −120 = 3 30 • • • U AB U AN UBN U U U o o o = − = −120 − 120 = 3 −90 • • • UBC UBN UCN U U U o o o = − = 120 − 0 = 3 150 • • • UCA UCN U AN U U U