A new approach to solid-state on load tap changing transformers

Thas poper presenls a neui approach t o solzd-state load lap changing system The tap changaiig s y s t e m as comprised of solad-state devzces (,SCʹRs) and a number of t r a n s f o r m e r t a p s Through ytdzcaoiis choicc of thc f n p changer topology and a novel control approach, our systcin as ablc t o offer u p to 48 steps in place o f t h e l h s t r p s nssocznicd wath nicchanzcal tap changers Further 11 7s nhlc lo do lhas wath feiucr transformer t a p ruzndiirgs aiid m t h the ahilaty t o moue from one tap to anoiher tap waihoui passang through any rnterincd i n t c t a p s The t o p changer concept has been esperzi i i c i i i n l l y iierzfied Examples are presented io zllustraic thr contcpts and how they can bc applaed to suppori 34 5 kV, 30 MVA crnd 115 kV, 100 MVA systems Economz( nnnlyszs of t h c s c sample s y s f c m s andacates that the nppronch presented can h p 20 - 50% less crpcnsziie thon preiuous c f o r t s i o rpalzie solid-state t a p changers