Radial double split foil winding and winding method thereof

Abstract

The invention discloses a radial double split foil winding and a winding method thereof. A first wire outlet copper bar and a second wire outlet copper bar of the winding are positioned on the inner side of the winding; a first-layer copper foil is welded on the first wire outlet copper bar, a first-layer insulation material is coated on the inner side of the first-layer copper foil; a second-layer copper foil is welded on the second wire outlet copper bar; a second-layer insulation material is coated on the inner side of the second-layer copper foil; and the first-layer copper foil and the second copper foil are arranged at an interval. During winding, the first wire outlet copper bar and the first-layer copper foil are wound on a winding former simultaneously; when a semicycle of the inner diameter of the winding is formed, the second-layer copper foil is placed on the inner side of the first-layer insulation material and is wound simultaneously; and the winding method is simple andconvenient and contributes to realizing mechanization of the winding process of the winding. The obtained winding is low in brow leakage, small in axial force and strong in short circuit bearing capacity during short circuit; and turn-to-turn capacitance of the winding along the winding is distributed uniformly, and impulse overvoltage stability of the winding is enhanced.

Description

technical field [0001] The invention relates to a foil coil for a transformer and a winding method thereof, in particular to a radial double-split foil coil and a winding method thereof. Background technique [0002] The foil coil is a coil wound with copper foil. When winding this coil, first weld the copper foil and the leading copper bar firmly, and then fix the leading copper bar on the winding mold to start winding. According to the required winding regulations The number of turns, cut the copper foil, and weld the tail copper bar. This foil coil structure is now commonly used in the transformer industry. [0003] The current of the low-voltage coil of the transformer is usually large. If multiple wires are wound in parallel, a large helix angle will be generated during winding, and the magnetic flux leakage at the end will be large. When the transformer is short-circuited, there will be a large Large mechanical force will cause damage to the coil; if it is wound with...

AI Technical Summary

Problems solved by technology

To realize the structural design of this split transformer, it cannot be completed with the commonly used foil coil structure and winding method.

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