8 12-2 Three-phase Y-Y connection Three-phase sources have three terminals called the line terminals(a, b,c) Neutral connection--n n Balanced three-phase sources may be defined as having 十 C Van =vbn vcn and van+y bn+ cn=0 These three voltages, each existing between one line and the neutral, are called phase voltages(van, Vbn, V cn§12-2 Three-phase Y-Y connection Three-phase sources have three terminals called the line terminals(a,b,c). Neutral connection--n Balanced three-phase sources may be defined as having = = + + = 0 • • • a n b n cn Va n Vb n Vcn and V V V These three voltages, each existing between one line and the neutral, are called phase voltages ( V an V bn V cn ) . • • • , ,    a b c n • V bn • + + + − − − V an • V cn •