Aiming　at　the　problem　that　the　primary　windings　may　flow　through　the　inrush　current　when　the　transformer　is　switched　on　under　the　condition　of　no-load　or　light-load,　a　novel　individual　phase　control　idea　based　on　combined-switches　is　proposed.　Based　on　analyzing　the　transient　switching　process　of　three-phase　no-load　transformer　whose　primary　side　adopts　the　star-shaped　ungrounded　connection　mode,　the　state　of　the　connected　flux　linkage　at　the　swit-ching　moment　of　the　no-load　transformer　is　deduced,　then　the　optimal　dynamic　switching　angle　for　suppressing　the　switching　inrush　current　is　obtained　considering　the　residual　flux,　which　changes　the　existing　phase　control　mode　depending　on　the　residual　flux　measurement　circuit　and　the　pre-set　fixed　phase　angle.　The　power　transformer　model　based　on　ATP/EMTP　is　built　to　simulate　the　transient　switching-on　and　switching-off　process,　and　the　voltage,　current　and　magnetic　flux　characteristics　at　the　switching　moment　are　obtained.　The　proposed　individual　phase　control　principle　is　verified　and　then　the　control　law　is　given.　A　novel　single-pole　switch　control　topology　with　three　operation　modes　and　logical　communication　function　is　designed　for　performing　the　individual　phase　control　strategy.　The　dynamic　combination　of　single-pole　switches　can　realize　the　coordinated　action　and　unified　control　of　each　pole　contact　in　the　optimal　phase.　The　hardware　control　platform　is　built　to　verify　that　the　proposed　control　strategy　can　effectively　limit　the　inrush　current　to　about　3%　of　the　inrush　current　in　random　switching.　©　2019,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.