Disc winding

Abstract

The invention is related to a disc winding of a power trans- former or a choke comprising plurality of parallel single strand conductors. The working time for bending the strand conductors of cross-overs is reduced by sharing the winding axially in plurality of sections, the cross-overs within a section being identical twin cross-overs (6), wherein the strand conductors are being bent in two groups, and a standardized twin transposition cross-over (9) being between the sections, wherein the strand con not ductors are being bent in two groups, the outermost strand conductor in the first groupand the rest in the an- other group.

Description

Background technique [0001] The invention relates to choke coils or disc windings of power transformers or distribution transformers comprising two or several parallel single-stranded conductors or twin-core cables. [0002] To make the conductors easier to bend and to reduce eddy currents, the conductors of power transformer windings are usually constructed of several parallel flat copper or aluminum stranded conductors rather than one large rectangular conductor. [0003] Each strand conductor has an insulating layer on its surface, allowing a potential difference between adjacent strand conductors and thus preventing eddy currents from one strand conductor to another. [0004] Serious problems remain. The length of the parallel stranded conductors varies between these conductors as a function of the average distance from the transformer core. Therefore, the induced voltages between the twisted conductors become different from each other and both ends are electrically conn...

AI Technical Summary

Problems solved by technology

[0010] The above modified windings are excellent for full turn discs, but cannot be used for windings with half turn discs

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