The winding is the circuit part of the transformer, which is wound with a paper-wrapped insulated flat wire or round wire.

The conductor element of the transformer likawin ay gawa sa tansong kawad na may hugis-parihaba na seksyon at mataas na kondaktibiti, at ang panlabas na bahagi ay nakabalot ng dalawang layer ng kraft paper para sa layunin ng pagkakabukod. Para sa mga insulating pad ng parehong materyal, ang bilang ng mga wire na tanso ay nakasalalay sa gumaganang boltahe, upang ang likawin elements have sufficient insulating strength between layers. Using glue on the outermost layer of insulating paper, each wrapping layer is glued together to form a tight coil. To reduce eddy current losses, line crossings are made at predetermined positions of the conductor elements. The coil of the shell-type transformer is fixed vertically. In order to prevent misalignment, a wooden wedge is inserted between the coil and the iron core. All ends of the coil are fixed by the wire core and the oil tank. The external force is distributed in a large area, which greatly improves the mechanical strength. .