122线电压(电流)与相电压(电流)的关系 A 1.Y联接 设U=U=U1∠0 Y B BN=UlB=U∠-1200 B B B UN=U/c=U120° BC C U=U-bBN=U∠0°-U∠-120°=3U∠30 =C-e=U∠-120-U∠120°=3∠-90° U=b-UN=U∠120°-U∠0°=√3U∠1501. Y联接 12.2线电压（电流）与相电压（电流）的关系 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 C A C N AN o o o BC BN C N o o o AB AN B N 120 0 3 150 120 120 3 90 0 120 3 30 = − =  −  =  = − =  − −  =  − = − =  −  − =  • • • • • • • • • U U U U U U U U U U U U U U U U U U 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