Stator bar main insulation structure for improving corona onset voltage of winding

Abstract

The invention discloses a stator bar main insulation structure for improving the corona onset voltage of a winding. The thickness end part of the main insulation of the stator bar is thinner than that of the slot part, so that when a stator winding is formed after wire embedding, the bevel edge distance of the winding can be increased, and the corona onset voltage level of the stator winding is improved. The main insulation structure of the stator bar is clear in principle, simple in structure, convenient in manufacturing process, practical and effective. On the premise of ensuring the operation performance of the stator bar, the use amount of the main insulating material of the stator bar can be reduced, the weight of the stator bar can be reduced, the risk of generating corona at the end part of the stator winding can be effectively reduced, adverse effects on unit test and operation caused by corona discharge of the winding can be avoided, and the operation stability and the service life of the stator winding can be improved. The main insulation structure of the stator bar for improving the corona onset voltage level of the winding provides a thought for further optimization and upgrading of a generator structure.

Description

technical field [0001] The invention relates to the field of large-scale air-cooled generators, in particular to the main insulation structure of a stator bar. Background technique [0002] With the increase of the rated voltage and rated capacity of large air-cooled generator sets, the problem of corona in the stator winding of generators has become prominent, which has become a technical problem that needs to be solved urgently in current generator products. Long-term corona discharge will damage the anti-corona layer of the stator bar and corrode the main insulation of the stator bar. In severe cases, a penetrating cavity will be formed, resulting in failure of the main insulation of the bar, and even a stator grounding accident, which seriously threatens the operation of the generator winding Safety. [0003] During the test and operation of the generator stator, the distance between the bars remains unchanged, and the potential difference between the leads of the bars ...

AI Technical Summary

Problems solved by technology

The thickness margin of the main insulation at the end of the traditional wire rod is large, which cannot save the amount of main insulation material, and cannot increase the gap between the hypotenuses of the stator winding, which affects the corona inception voltage level of the winding to a certain extent

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