Air-cooled dry-type transformer

An air-cooled dry-type transformer, comprising:

• a core provided with a branch;
• a winding body arranged about the branch;
• a cooling channel extending in a direction of a longitudinal axis of the winding body, the cooling channel being arranged between an inner part of the winding body and an outer part of the winding body, the cooling channel having an opening at each end of the cooling channel and a substantially ring-shaped cross section with a round, oval, or polygonal basic shape;
• and
• at least one ring ventilator comprising a ring and a blower, the blower being configured to suction air and to blow the air from the ring along a longitudinal axis of the ring, thereby generating an air flow, wherein the at least one ring ventilator is dimensioned and mounted such that the air flow generates a cool air flow in the cooling channel, the at least one ring ventilator comprising a first ring ventilator and a second ring ventilator, the first ring ventilator being configured to blow air into the cooling channel through a first opening at a first end of the cooling channel and the second ring ventilator being configured to suck air out from the cooling channel through a second opening at a second end of the cooling channel.