Low-voltage winding structure of on-load capacitance regulation transformer, winding method of low-voltage winding structure and transformer

Abstract

A low-voltage winding structure and winding method of an on-load capacity regulating transformer, and a transformer. The low-voltage winding structure includes a low-voltage section I, a low-voltage section II, a low-voltage section III, and five lead-out copper bars. The three sections are all wound with copper foil. The low-voltage section III is located on the inner side, and the low-pressure section I and the low-pressure section II are axially aligned and located on the outside; the low-voltage section III uses x copper bars and x 2 The copper bar is led out, and the low-voltage section I adopts a 1 Copper row and x 1 The copper bar is led out, and the low-voltage section II adopts a 2 Copper row and x 2 Copper row leads, copper row x 2 It is the co-arrangement of the low pressure III section and the low pressure II. The winding structure first winds the low-voltage section III, and the copper bars x and x 2 Lead out on the left side; then wind the low-voltage section II, and temporarily fasten the turns of the low-voltage section II after winding; then wind the low-voltage section I, copper bar a 1 、x 1 Lead out on the left; lead out copper bar a at the end 2 . The structure is made of copper foil, which has the characteristics of good manufacturability, high winding efficiency, high mechanical strength of the product, easy and tidy assembly of lead wires, etc., which improves the short-circuit resistance capacity of the transformer.

Description

technical field [0001] The invention relates to a structure and a winding method of a low-voltage winding of an on-load capacity regulating transformer and a transformer, which are applicable to oil-immersed and dry-type capacity regulating transformers and belong to the technical field of distribution transformers. Background technique [0002] The on-load capacity-adjusting transformer realizes the on-load capacity adjustment through the simultaneous conversion of high-voltage D-Y and low-voltage parallel-series. The low-voltage winding consists of three sections of turns, two of which are series and parallel turns, and one section is a common turn, with a total of six leads. At present, low-voltage windings mostly adopt a three-layer cylindrical structure, and the wires are composed of multiple radial and axial parallel paper-wrapped flat copper wires. Due to the radial direction and the number of windings, a standard transposition is required in the middle of each layer...

AI Technical Summary

Problems solved by technology

In this structure, each winding has two lead-out copper bars, and three windings lead out six lead-out copper bars, two of which are large-sectional area copper bars, and four are small-sectional area copper bars, and can be seen from the attached drawings Six lead-out copper bars, three of which are drawn from the upper part and three from the lower part, this method cannot effectively reduce the space occupied by the lead-out copper bars of the core and winding, and the cost is relatively high

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