NL2005439C2 - A multiple parallel conductor for an electrical machine. - Google Patents

Description

A multiple parallel conductor for an electrical machine

The invention relates to a multiple parallel conductor for an electrical machine comprising a plurality of adjacent subconductors arranged in plural adjacent layers to form a subconductor bundle, said bundle having an outer peripheral surface 5 including a plurality of contiguous surface sections, wherein each subconductor is covered with an insulation covering and wherein the subconductor bundle has at least a insulation extending on the outer peripheral surface of said bundle covering a plurality of said contiguous surface sections.

10 Such a multiple parallel conductor is known from US-B- 6,563,413. The known multiple parallel conductor is provided with a protective insulation covering at least one surface section of the subconductor bundle yet does not cover each surface section of the subconductor bundle. Particularly according to 15 this document it is provided that the insulation extends only over at least one surface section (side face, top, underside) and leaves at least one surface section exposed. In this way it is possible to avoid the use of spacers that are otherwise required for securing the electrical characteristics of the wind-20 ing which may be impaired when individual windings of parallel wound multiple parallel conductors come to lie directly against each other which brings about the risk that the enamel insulation of these conductors becomes damaged.

It is an objective of the invention to provide a multi-25 pie parallel conductor which is less prone to damage of the enamel insulation of the conductors, which is easy to manufacture also in terms of securing the required electrical characteristics of the conductor, and which may be applied with an improved space factor avoiding the use of spacers between adjacent 30 subconductor bundles.

For this purpose a multiple parallel conductor and a winding for an electrical machine is proposed in accordance with one or more of the patent claims. !

In accordance with the invention it is proposed that 35 the insulation of the multiple parallel conductor comprises a first insulation on the outer peripheral surface of the bundle which is in immediate contact with said bundle, and a second in- 2 sulation on the outer side of the first insulation wherein both the first and the second insulation completely surround the subconductor bundle, and in that an intermediate insulation layer is provided between the first and the second insulation only at 5 the sides of the subconductor bundle that in the ready electrical machine lie adjacent to each other. In this way it is possible to arrange that the intermediate insulation layer does not impair cooling of the subconductor bundle.

Correspondingly the invention is also embodied in a 10 winding for an electrical machine comprising a plurality of multiple parallel conductors, each of the multiple parallel conductors comprising a plurality of adjacent subconductors arranged in plural adjacent layers to form a subconductor bundle, said bundle having an outer peripheral surface including a plurality 15 of contiguous surface sections, wherein each subconductor is covered with an insulation covering and wherein the subconductor bundle has at least a insulation extending on the outer peripheral surface of said bundle covering a plurality of said contiguous surface sections. According to the invention this wind-20 ing has the feature that the insulation of each bundle is divided in a first insulation on the outer peripheral surface of the bundle which is in immediate contact with said bundle, and a second insulation on the outer side of the first insulation wherein both the first and the second insulation completely sur-25 round the subconductor bundle, and in that an intermediate insulation layer is provided between the first and the second insulation only at the sides of the subconductor bundle that lie ad-• jacent to corresponding sides of adjacent subconductor bundles of the winding.

30 Suitably the combined thickness of the adjacent insula tions of said adjacent subconductor bundles is arranged to meet predefined insulation properties, and that the intermediate insulation layer is avoided at the sides of the subconductor bundles of the winding that are arranged for cooling.

35 Application of the multiple parallel conductor and/or the winding of the invention provides the benefits that it is possible to • manufacture electrical machines, such as transformers, with reduced dimensions or alternatively higher capacity whilst 40 maintaining the same dimensions; ! i 3 * manufacture high-end transformers having a capacity of more than 700 MVA; • manufacture at reduced cost.

The invention will hereafter be further elucidated 5 with reference to the drawing showing schematically a multiple parallel conductor and a winding of the invention.

In the drawing: -figure 1 shows a cross-section of a multiple parallel conductor of the invention; and 10 -figure 2 schematically shows a part of the winding of the invention.

Wherever in the figures the same reference numerals are applied, these numerals refer to the same parts.

In figure 1 the multiple parallel conductor of the in-15 vention is generally indicated with reference 1. This multiple parallel conductor 1 is in a manner completely known in the art provided with a plurality of adjacent subconductors 2 arranged in plural adjacent layers to form a subconductor bundle 3. Also in a manner completely known in the art each subconductor 2 is 20 covered with an insulation covering, usually an enamel covering which is not particularly shown in this figure considering that this requires no elucidation for the person skilled in the art.

The semiconductor bundle 3 has an insulation which is comprising a first insulation 4 on the outer peripheral surface 25 of the bundle 3 which is in immediate contact with said bundle 3, and a second insulation 6 on the outer side of the first insulation 4 wherein both the first 4 and the second insulation 6 completely surround the subconductor bundle 3, and in that an intermediate insulation layer 5 is provided between the first 4 30 and the second insulation 6 substantially only at the sides of the subconductor bundle 3 that in the ready electrical machine lie adjacent to each other. The words 'substantially only' as used in the previous sentence mean that it is not excluded that the intermediate insulation layer 5 corners around the edges 5' 35 to also in part extend along the upper side 1' and lower side 1'' of the multiple parallel conductor 1. Essentially however according to the invention this upper side 1' and lower side 1' ' should be left without an intermediate insulation layer so as to arrange that the insulation layer does not impair cooling of the 40 subconductor bundle 3. This can be better explained with refer- 4 ence to figure 2.

Figure 2 shows a part of a winding 10 of the invention that comprises multiple adjacent multiple parallel conductors 1. As explained with reference to figure 1 each multiple parallel 5 conductor 1 has an intermediate insulation layer 5 that is provided between the first 4 and the second insulation 6 substantially only at the sides of the subconductor bundle 3 that in the ready electrical machine lie adjacent to each other. This means that with reference to the subconductor bundle 3 shown in 10 figure 2 in the middle between the subconductor bundles 3', 3'', the intermediate insulation layer is provided only between the first and the second insulation at the sides 11 of the subconductor bundle 3 that lie adjacent to corresponding sides 11 of the adjacent subconductor bundles 3’, 3'' of the winding 1.

15 The beauty of this construction is that the combined thickness of the adjacent insulations of said adjacent subconductor bundles 3, 3' and 3, 3'' can precisely be tuned to meet predefined electrical insulation properties, and that cooling of the subconductor bundles 3, 3' and 3'' can be optimized by ar-20 ranging that the intermediate insulation layer is avoided at the sides 12 of the subconductor bundles 3, 3'and 3'' of the winding 10 that are arranged for cooling.

Consistent with the law, the foregoing description and the reference to the embodiment shown in the figures cannot be 25 used for a limited interpretation of the claims. The description and the figures merely serve to elucidate said claims, and the scope of protection of said claims extends to all feasible variations thereof.

Claims (3)

A multiple parallel conductor (1) for an electrical machine comprising a plurality of adjacent subconductors (2) arranged in multiple adjacent layers to form a subconductor bundle (3, 3 ', 3' '), well each bundle (3, 3 ', 3' ') has an outer peripheral surface comprising a plurality of adjacent surface parts, in which each sub-conductor (2) is covered with an insulation cover and in which the sub-conductor bundle (3, 3', 3 '') has at least one has insulation (4, 5, 6) extending on the outer peripheral surface of said bundle (3, 3 ', 3' '), thereby covering a plurality of said adjacent surface parts, characterized in that the insulation (4, 5, 6) has a first insulation (4) on the outer peripheral surface of the bundle (3, 3 ', 3' ') which is in direct contact with said bundle, and a second insulation (6) on the outside of the first insulation ( 4) in which both the | the first if the second insulation (4, 6) completely surrounds the subconductor bundle (3, {3 ', 3' '), and that an intermediate insulation layer (5) is provided between the first and the second insulation (4, 6) only on the sides of the subconductor bundle (3, 3 ', 3' ') that lie side by side in the finished electrical machine. 2. An electrical machine winding comprising a plurality of parallel conductors (2), wherein each of the multiple parallel conductors (2) comprises a plurality of adjacent sub-conductors arranged in multiple adjacent layers to form a sub-conductor bundle (3). , 3 ', 3' '), wherein said bundle has an outer peripheral surface | comprising a plurality of adjacent surface parts, wherein each sub-conductor (2) is covered with an insulation cover and j wherein the sub-conductor bundle (3, 3 ', 3' ') has at least one insulation 30 (4, 5, 6) that extends to the outer peripheral surface of said bundle (3, 3 ', 3' '), covering a plurality of said adjacent surface parts, characterized in that the insulation (4, 5, 6) of each bundle (3, 3', 31 ') has a first insulation (4) on the outer peripheral surface of the bundle (3, 3 ', 3' ') which is in direct contact with said bundle, and a second insulation (6) on the outside of the first insulation (4) in which both the first and the second insulation (4, 6) completely surround the subconductor bundle (3, 3 ', 3' '), and in which an intermediate insulation layer (5) is provided between the first and the second insulation (4 , 6) only on the sides of the subconductor bundle (3, 3 ', 3' ') that are adjacent to corresponding sides 5 of adjacent subconductor bundles (3, 3 ', 3' ') of the winding. 3. An electrical machine winding as claimed in claim 2, characterized in that the combined thickness of the adjacent insulations (4, 5, 6) of said adjacent! Subconductor bundles (3, 3 ', 3' ') are arranged to satisfy predetermined insulation properties and that the intermediate insulation layer (5) is avoided on the sides of the subconductor bundles (3, 3', 3 '') of the windings arranged for cooling.