Reactor and Respective Manufacturing Method

1 - 20 . (canceled)

21 . Method for producing a reactor with at least two winding sections for power applications, the method comprising:

providing a tank;

winding at least one conducting layer about a cylindrical support mold, and at least partially embedding the at least one conducting layer in a fibrous material, to produce at least two winding sections and to form a coil, wherein at least two of the winding sections are concentrically provided on the cylindrical support mold and have different inner and outer diameters with respect to each other;

placing the winding sections in the tank,

applying a vacuum to the tank;

immersing the winding sections in a curable resin;

impregnating the winding sections in the tank with the resin, while applying a pressure in the range from 2 bar to 8 bar to the tank;

removing the winding sections from the tank; and

leaving the resin to cure.

22 . The method of claim 21 , further comprising: providing an end wrapping comprising a fibrous material around at least one axial end of the winding section.

23 . The method of claim 21 , wherein the diameters of the winding sections are configured such that a cooling duct is formed between the winding sections; and electrically connecting the at least two winding sections in parallel at each of the axial ends of the winding sections.

24 . The method according to claim 23 , wherein electrically connecting comprises providing a first terminal at a first axial end of the winding sections, and providing a second terminal at a second axial end of the winding sections.

25 . The method of claim 24 , wherein at least one of the first terminal and the second terminal comprises a plurality of elongated elements extending radially from a center portion towards the winding sections, and wherein the elements are preferably equally distributed angularly in a circumferential direction of the reactor.

26 . The method of claim 25 , wherein the first terminal and second terminal and their connection to the winding sections are configured to provide mechanical stability to the reactor; at least one of the terminals having the shape of a cross, for providing the mechanical stability to the winding section of the reactor.

27 . The method according to claim 23 , further comprising: providing placeholders in the cooling duct between a first winding section and a second winding section.

28 . The method of claim 21 , wherein at least one of the cross-sections, the composition of the conductors, the number of winding turns or the wound conducting layers of the coil may vary between the winding sections ( 40 , 40 a ).

29 . The method of claim 21 , wherein the winding sections comprise an interlayer insulation between consecutive winding layers in the respective winding section.

30 . The method of claim 21 , wherein at least one of the winding sections comprises a tape on their outer surfaces, which is applied prior to the impregnation.

31 . The method of claim 22 , wherein the fibrous material comprises a felt mat or woven fibrous material.

32 . The method of claim 21 , wherein a coating is applied to an outermost surface of the reactor, which is preferably a UV resistant coating.

33 . The method of claim 21 , wherein the winding section is completely immersed in the curable resin, wherein the resin is epoxy resin or polyester resin.

34 . The method of claim 21 , wherein the pressure applied to the resin-filled tank is in the range from 2.5 bar to 7 bar.

35 . An air-core reactor, manufactured according to the method of claim 21 .

36 . Use of a vacuum pressure impregnation process according to the method of claim 21 in manufacturing at least two winding sections of an electrical power reactor.

37 . The method of claim 25 , wherein the first terminal and second terminal and their connection to the winding sections are configured to provide mechanical stability to the reactor; both terminals each having the shape of a cross, for providing the mechanical stability to the winding section of the reactor.

38 . The method of claim 21 , wherein each conducting layer comprises a plurality of turns axially arranged along the winding axis.

39 . The method of claim 21 , wherein each turn comprises one or more conductors axially and radially arranged.

40 . The method of claim 21 , wherein the pressure applied to the resin-filled tank is in a range from 3 bar to 6 bar.