Stator coil bar structure of large power generator

Abstract

The invention provides a stator coil bar structure of a large power generator. The stator coil bar structure comprises a main insulation unit, a semiconductor band, electromagnetic wires, an inter-row insulation unit, semiconductor putty and a bare copper wire. The stator coil bar structure is characterized in that the inter-row insulation unit is arranged in the middle of each electromagnetic wire; a gap generated by transposition is filled with the semiconductor putty on transposition narrow surfaces on two sides of the electromagnetic wire, and four corners of the semiconductor putty on the upper and lower narrow surfaces are rounded; and the transposition narrow surfaces on the outer side of the semiconductor putty are paved with the bare copper wire welded together with a conductor of the electromagnetic wire, and then a stranded wire of the conductor is wrapped with the semiconductor band with the same resistance range as the semiconductor putty. The stator coil bar structure has the characteristics that a conductor structure has good overall shape and a semiconductor equipotential layer is improved, so that the effects of homogenizing electric fields at the corners of the main insulation unit of the stator coil bar of the large power generator, inhibiting local discharge, reducing additional loss of the coil bar and avoiding local overheating to prolong the service life of the main insulation unit are achieved; and the unit capacity and operation reliability of the power generator are improved.

Description

technical field [0001] The invention relates to a large-scale generator stator bar structure, which can homogenize the electric field inside the transposition bar and eliminate the electric field concentration phenomenon caused by the sudden change of shape inside the bar, especially the transposition narrow surface and the four parts of the bar. The electric field concentrates at the corners. The risk of partial discharge is reduced, the electrical insulation strength of the stator bar is improved, and it belongs to the field of large-scale generator insulation research. Background technique [0002] In the production process of large generator stator bars, in order to avoid the additional loss caused by the conductor eddy current and strand circulation, the method of multi-strand wire transposition is usually used to reduce the additional loss; The bit narrow face forms many transposition gaps. These gaps are usually filled with some insulating materials. These filling i...

AI Technical Summary

Problems solved by technology

These gaps are usually filled with some insulating materials. These filling insulations only fill up the geometry of the narrow surface of the transposed bar. When the generator is running, the electric field inside the bar still has a field concentration phenomenon, which makes the local main insulation of the stator bar Under the high field strength, it will lead to local overheating of the wire rod, and the long-term operation will accelerate the electrical aging and thermal aging of the wire rod, which will affect the service life of the stator wire rod

Images