Manufacturing method for stator bar capable of improving corona onset voltage of winding

Abstract

The invention discloses a manufacturing method for a stator bar capable of improving the corona onset voltage of a winding. According to the stator bar, a low-resistance layer is additionally arrangedin an anti-corona structure at the end of the stator bar; and compared with a traditional anti-corona structure, the anti-corona structure of the invention can effectively reduce surface potential ofthe end of the bar, so the potential difference between winding bars is reduced, and the corona onset voltage level of a winding of the whole unit is improved. The stator bar of the anti-corona structure has the advantages of simple structure, convenience in manufacturing, remarkable effect and easiness in repairing, can greatly improve the corona onset voltage level of the end of a winding on the premise that the operation life of the stator winding is not shortened, and enhances the operation stability of the winding of the whole unit.

Description

technical field [0001] The invention relates to the field of generator stator windings, in particular to a manufacturing method of a stator bar for increasing the corona inception voltage of the winding. Background technique [0002] During the operation of the stator winding of the generator, corona discharge phenomenon is prone to occur. This phenomenon will gradually corrode the main insulation material of the stator bar, cause a discharge channel and produce insulation holes, and in severe cases lead to insulation failure, which has a great impact on the operation safety of the unit. big threat. [0003] In the stator winding, due to the small gap between the hypotenuses and the large potential difference between the bars of different phases in the same layer, the electric field is very large during the test and operation, which is the weak part of the corona discharge in the winding. The end of the stator bar of the traditional anti-corona structure uses medium-resista...

AI Technical Summary

Problems solved by technology

The end of the stator bar of the traditional anti-corona structure uses medium-resistance and high-resistance anti-corona materials. Due to the high resistance of these materials, the surface potential at the end of the bar is very high, resulting in a potential difference between the different-phase bars. larger

At the same time, due to the relatively compact design of the winding end, it is difficult to increase the gap between the hypotenuses, which makes it difficult for the traditional anti-corona structure to adjust the electric field on the hypotenuse of the winding.

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