Patent ID: 8049587

Claim:
A cooling system for a dry air-core reactor, the reactor comprising a winding around the air-core, the winding being divided into winding packages, the air core comprising: first open spaces inside the winding packages to let air flow through the winding inside the winding packages in parallel with an axis of symmetry of the reactor and second open spaces crossing the first open spaces between winding packages to let air flow through the winding between winding packages angular to the axis of symmetry, the cooling system comprising: a ventilation unit producing a forced-air flow, where a first part of the forced-air flow enters one of the first or second open spaces, at least one guiding element which is arranged with respect to a crossing of the first and the second open spaces in such a way that the first part of the forced-air flow leaves and a second part of the forced-air flow enters the one of the first or second open spaces, and a shielding element is arranged at another crossing of the first and the second open spaces so that substantially no air can leave or enter the one of the first or second open spaces.