Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for manufacturing a three-phase transformer

A technology for three-phase transformers, applied in transformers, fixed transformers, inductance/transformer/magnet manufacturing, etc., can solve problems such as insufficient effective coefficient, excessive resistance, and large influence

Inactive Publication Date: 2019-04-16
LLC CERAMIC TECH
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the three-phase transformer produced by this method: too high leakage inductance, too large resistance, poor internal winding heat dissipation, too large reluctance and noise, and insufficient effective coefficient
For transformers made with Unicore technology, the position of the butt joints of the steel straps inside the windings also makes this reason more influential
The effective factor is not high enough because the transformer mass and size are too large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for manufacturing a three-phase transformer
  • Method for manufacturing a three-phase transformer
  • Method for manufacturing a three-phase transformer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091] Rectangular steel strips made of transformer steel plates with a thickness of about 0.3 mm are used, which are placed in the unit in such a way that they are connected to each other, and the long sides are arranged in the same direction (longitudinal). Six units are obtained from which an assembly is formed and three assemblies are obtained, in each assembly the core of the magnetizer is the middle area of ​​the assembly. Each unit is composed of M subassemblies, M=25, and each subassembly is composed of N steel strips with the same width, N=6. The strip widths of different subassemblies of the same unit are different. The strip widths were varied from 25.2 mm to 92.0 mm (see Table 1). The sub-assembly for the widest (92 mm) strip is located in the middle of the assembly. The subassemblies in each unit are placed relative to each other and keep their strip widths decreasing from the middle of the module towards its edges. In the edge subassembly, the strip width is 2...

example 2

[0099] In the same manner as described in Example 1, three assemblies are obtained, each of which is secured so that the primary and secondary windings are installed by means of frameless winding in each area of ​​the assembly corresponding to the core , to maintain the placement of the steel strip.

[0100] Then, in the same manner as described in Example 1, on each core, mount the primary and secondary windings by frameless winding to each area of ​​the wire assembly corresponding to the core, but during the winding process , when transitioning to the latter row of coils, the above-mentioned deformation of the wire is carried out, which is additionally thinned by 10 microns and laid in this case with insulating material, mica sheets. In electrical insulating varnish (polyimide varnish, type АД9103ПС), winding is performed.

[0101] In the same manner as described in Example 1, the fabrication of the transformer is completed by concluding the assembly of the magnetizer.

example 3

[0103] In the same manner as described in Example 1, the assemblies were obtained, each of which was secured so as to maintain the placement of the strips until the windings were fitted to each area of ​​the assembly corresponding to the core.

[0104] Then, in the same manner as described in Example 1, on each core, mount the primary and secondary windings by frameless winding to each area of ​​the wire assembly corresponding to the core, but during the winding process , when transitioning to the latter row of coils, the above-mentioned deformation of the wire is carried out, which is additionally thinned by 20 microns and laid in this case with insulating material, mica sheets. Winding is carried out outdoors in a subsequent low vacuum (pre-vacuum stage) impregnation in an electrically insulating varnish (silazane varnish, type МСН 7-80) under normal atmospheric pressure conditions.

[0105] In the same manner as described in Example 1, the fabrication of the transformer is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
widthaaaaaaaaaa
Login to View More

Abstract

In the present method for manufacturing a three-phase transformer, first three stacks of steel strips of individual lengths are formed for assembly of a magnetic core. In a stack, the length of each strip and the position of the strips in relation to one another in a longitudinal direction are selected such as to allow the magnetic core to bend tightly around windings mounted on the middle portions of the stacks, said middle portions constituting limbs and being characterized by a stepped cross-section which approximates to an elliptical or circular shape. Primary and secondary windings are mounted by means of the unsupported winding of a wire which is tensioned and exerts a clamping force on the magnetic core. Aluminium wire with ceramic insulation is used. The core is then assembled. First the ends of the strips of the middle stack are butt-joined to the ends of the corresponding nearest strips of the outer stacks to form regions of the magnetic core which act as yokes. Then the endsof the corresponding outermost strips of the outer stacks are likewise butt-joined to form regions of the magnetic core which act as yokes. The end joins on the yoke portions are situated in different places.

Description

technical field [0001] The invention belongs to the field of electrotechnical technology and the field of transformer production. Background technique [0002] A well-known three-phase transformer manufacturing method (US Patent No. 3283281) includes making steel sheets for assembling the magnetic circuit, assembling the magnetic circuit on a plane composed of three parallel iron cores and upper and lower yokes, and Windings are installed on the iron core, and the iron core and the yoke are assembled by steel sheets. These steel sheets form a magnetic circuit when batching ingredients. The cross section of the magnetic circuit is rectangular and has two holes. Any one of the iron cores The steel sheets are cut at an angle of 45 degrees on the diagonal, and the diagonal section connects the longitudinal edges. The diagonal section of the steel sheet forming each of the above yokes must include a 45-degree section and a right-angle section. The batching is carried out along t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F30/12
CPCH01F41/0213
Inventor A·A·尼基福罗夫
Owner LLC CERAMIC TECH