Two-cycle hybrid transposed stator bar of large steam-turbine generator and two-cycle hybrid transposition method

Abstract

The invention discloses a two-cycle hybrid transposed stator bar of a large steam-turbine generator and a two-cycle hybrid transposition method. Four columns of transposed braided wires of the stator bar comprise an outer layer of transposed braided wires and an inner layer of transposed braided wires, wherein the outer layer of transposed braided wires is four greater than the inner layer of transposed braided wires in number; and insulating layers coat the outer layer of the inner layer of transposed braided wires. According to the two-cycle transposition method, the inner layer of transposed braided wires and the outer layer of transposed braided wires are transposed respectively; and the torsional transposition directions are opposite. According to the method, each transposed braided wire has equal opportunity to occupy the spatial positions at the left side and the right side of a stator winding slot part, so that distribution of a leakage magnetic field in the slot can be well balanced; the circulating current losses between the branded wires are effectively reduced; the service life of the generator is prolonged; the operation safety of the generator is improved; and meanwhile, strapping and fixing of the transposed braided wires are relatively facilitated.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of a large turbogenerator, in particular to a bicircular mixed transposition stator bar of a large turbogenerator and a bicircular mixed transposition method for the stator bar. Background technique [0002] The stator bar is one of the important parts of the turbogenerator. The stator bar of the large turbogenerator mainly adopts the bar type bar. In order to reduce the eddy current loss caused by the skin effect in the bar, dozens of However, due to the difference in the leakage flux linkage between each parallel branch, unbalanced leakage inductance potential and strand circulation are generated in the strands; the test results show that the large generator stator The temperature difference between the strands in the wire rod can be as high as 30-40°C, which greatly reduces the efficiency of the generator and seriously affects the insulation life and operation safety of the stato...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a large-scale turbogenerator bicircular hybrid transposition stator bar, which solves the problem of the large circulation loss in the existing stator bar which leads to the safety of generator operation. low problem

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