A combination tansflomeris atransfommer thatcombines the body ofa step up transfommer,switchgear, fuse,tap change, and coresponding auilary equipment. he highvolage switch and fuse are allinstaled in the ol tank, with a smaler overalsze. lstnuctunl fom is simlar to the box tansfomer introdukced from the United states in the 1990sand can be dhided into two types accordingto productstnucture and component conlfiguration.Oneis a fuly insulated box bype product, one typeis a common bax ype producthat uses dry casing, for highvoltage output.