Anti-corona structure of strip winding VPI bar of high-voltage generator

Abstract

The invention relates to the technical field of high-voltage generators, in particular to an anti-corona structure of a strip winding VPI bar of a high-voltage generator, which comprises an inter-strand bar, a main insulating layer and an anti-corona layer, the anti-corona layer wraps the inter-strand bar, the main insulating layer wraps the inter-strand bar, and the outer layer of the main insulating layer is wrapped with a VPI low-resistance tape in a half-lap manner. The outer layer of the VPI low-resistance tape is wrapped with a VPI middle-resistance tape in a semi-overlapped mode, the VPI middle-resistance tape extends to the bent section along the corner, the VPI middle-resistance tape located on the bent section is wrapped with a multi-glue mica tape in a flat wrapping mode, the multi-glue mica tape is wrapped with a VPI high-resistance tape in a semi-overlapped mode and extends at the tail end, and the outer layer of the VPI high-stop tape is wrapped with a VPI protective tapein a semi-laminated manner. Effective transition of different resistance values can be achieved, meanwhile, the lap joint parts between the resistance bands are reasonable, the using amount of insulating materials and anti-corona materials is effectively reduced, and therefore the weight of the whole machine is reduced.

Description

technical field [0001] The invention relates to the technical field of high-voltage generators, in particular to an anti-corona structure for a strip-type winding VPI bar of a high-voltage generator. Background technique [0002] At present, with the continuous increase of power demand, the capacity and voltage level of large-scale generator sets have been greatly improved, and the requirements for the reliability of the internal insulation structure of the generator have also increased. The ability to put forward more stringent requirements. Studies have shown that when the high-voltage generator is running, the electric field of the motor stator winding is concentrated at the ventilation slot and the straight line exit slot, and the winding end. When the local field strength reaches a certain value, the gas is partially ionized, and a blue color appears at the ionized place. Fluorescence, that is, the corona phenomenon appears, and the "creeping phenomenon" also occurs lo...

AI Technical Summary

Problems solved by technology

However, the accumulation of the anti-corona layer at the end of the high-voltage motor winding not only affects the dipping and curing effect of the anti-corona layer, but also is not conducive to the heat dissipation at the end, which has a certain impact on the safety of the motor.

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