by the cooling medium being carried away more strongly by way of example two openings 7 a 7 b in the continuous channels 10 a 10 b are illustrated a side element 8 a is arranged in the radial direction u2014 with respect to the longitudinal axis of the electrical winding body 1 a u2014 with holding elements 9 a 9 b 9 c fixing the side element to the outer surface of the electrical winding body 1 a the plan view in fig3 shows three electrical winding bodies 1 a 1 b 1 c which are at least partially surrounded by a side element 8 a 8 b 8 c 8 d and at least partially have extension elements 2 a 3 a 3 b 3 c 3 d 3 e the electrical winding body 1 a for the first phase has an extension element 2 a with respect to the center channel opening 6 a in the electrical winding body 1 a this lengthens the channel 10 a not illustrated of the center opening 6 a upward the center opening 6 a can likewise be lengthened in the direction of the base thus resulting in an extended continuous channel 10 a going beyond the external dimensions of the electrical winding body 1 a the first electrical winding body 1 a is partially surrounded by a side element 8 a for the second phase of a three limb transformer the second electrical winding body 1.