DRY-TYPE TRANSFORMER COIL AND A WINDING METHOD THEREFOR

A dry-type transformer coil and a method of winding a dry-type transformer coil are disclosed. An inner coil of pancake coils is separated from an outer coil of pancake coils by a first spacer block, to form a first air passage. Respective inner coils of adjacent two layers of pancake coils are separated from each other by a second spacer block, and respective outer coils of the adjacent two layers of pancake coils are separated from each other by a third spacer block, to form a second air passage. The first air passage cooperates with the second air passage, so that heat caused by operation of pancake coils can be effectively and quickly dissipated, thereby improving operational reliability of the dry-type transformer coil and increasing service life of the dry-type transformer coil. Compared with a conventional dry-type transformer coil, the voltage between layers is greatly reduced.