A method for winding segmented cylindrical high voltage coils of dry-type transformers

Abstract

The invention provides a method for winding a sectional cylindrical high-voltage coil of a dry-type transformer. The method comprises the following steps of winding a first layer of a first section of a coil, bending a lead wire of the last but one turn of the layer to form an S-bend, wrapping insulation paper on the S-bend, and then winding the last turn of the first layer; winding an ascending layer of the coil, bonding the lead wire of a first turn of the ascending layer on the S-bend of the first layer, binding and fixing the lead wires of the adjacent turns at the ascending layer position through a binding band, then winding the remaining number of turns of a second layer of the first section of the coil, bending the lead wire of the last but one turn of the layer to form the S-bend, and wrapping the insulation paper on the S-bend; and repeating the abovementioned steps to complete winding of the coil of the remaining number of layers of the first section and winding of the coils of the remaining sections. According to the method for winding the sectional cylindrical high-voltage coil of the dry-type transformer, the number of turns of the first layer of the coils of each section is greater than the number of calculated full turns, the coils of the middle layers are wound in a full turn manner, and the last layers are wound in a non-full manner; the coil is of a cylindrical shape as a whole; compared with a stepped structure arranged coil wound and formed in an existing winding method, more number of turns can be arranged in the same space, the product volume is reduced and the total cost is reduced by more than 5%.

Description

technical field [0001] The invention relates to a method for winding a segmented cylindrical high-voltage coil of a dry-type transformer, belonging to the technical field of transformers. Background technique [0002] Most of the high-voltage windings of traditional dry-type transformers adopt a segmented cylindrical structure. 10kV adopts 4 segments, 20kV adopts 6 segments or 8 segments, and 35kV adopts 10 segments or 12 segments. The positioning structure (oil shift gear plate) cannot design each layer with the same number of turns, otherwise the coil height is not enough when the layer is raised, and each layer needs to be less than 1 turn. Each section of the 9-layer coil is arranged in a ladder structure, which still needs to be increased by 4x15 = 60 turns, the total window size is larger than 8 wire widths, not only need to use more copper (aluminum), but also increase the weight of silicon steel sheets, insulating materials, steel and resin due to the increase in the...

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Problems solved by technology

[0002] Most of the high-voltage windings of traditional dry-type transformers adopt a segmented cylindrical structure. 10kV adopts 4 segments, 20kV adopts 6 segments or 8 segments, and 35kV adopts 10 segments or 12 segments. The segmented cylindrical structure has no upper and lower ends of each segment. The positioning structure (oil shift gear plate) cannot design each layer with the same number of turns, otherwise the height of the coil is not enough when the layer is raised, and each layer needs to be less than 1 turn. Each section of the 9-layer coil is arranged in a ladder structure, and it is still necessary to increase 4x15 = 60 turns, the total window size is larger than 8 wire widths, not only need to use more copper (aluminum), but also increase the weight of silicon steel sheets, insulating materials, steel and resin due to the increase in the height of the iron core, and the cost of 6 segments and above will also increase. will be bigger

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