PEREC 4.1.2 Three-phase Ac voltage controller 4 Classification of three-phase circuits VTNVI T Y connection Line-controlled A connection Branch-controlled A connection Neutral-point-controlled A connectionPower E l ect r o n cs i 13 4.1.2 Three-phase AC voltage controller phase AC voltage controller Classification of three Classification of three-phase circuits phase circuits Y connection Y connection Line-controlled controlled ∆ connection connection Branch-controlled controlled ∆ connection connection Neutral Neutral-point-controlled controlled ∆ connection connection