Process of integrally winding foil coils with low-voltage windings of axially split transformers

Abstract

The present invention provides a structure and process of an integrally wound foil coil of a low voltage winding of an axial split transformer. The metal foil winding in the present invention is made of copper foil or aluminum foil, and is made by using a two-layer foil winding machine to perform coaxial winding. A middle insulation annular pad is made of cardboard, an insulation distance is reduced to 10 mm to 15 mm, and the consumption of a silicon steel sheet and an insulation material is reduced by 1.2% to 1.5%. A heat dissipation oil passage is of a vertical long structure, a support strip is axially parallel to the oil passage, and end rings are saved, so that it is ensured that oil flow is smooth. In a semi-traversal running state, when one split coil is impacted by short-circuit power, another split coil may be mechanically linked to the short-circuited coil by the long oil passage support strip, so that anti-short circuit strength is improved. The number of low-voltage coils of each transformer that are subjected to winding and sleeving is decreased from the number, 6, of traditional coils made by winding a flat wire to 3, so that working hours of winding and sleeving of low-voltage coils are reduced by 50%, and working efficiency and produce performance are improved.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to an axial split transformer low-voltage winding integrally wound foil-type coil structure and process with a voltage level of 35 kV and below. Background technique [0002] In the power system, low-voltage split transformers are usually used for factory transformers and start-up transformers. Since the beginning of the 21st century, with the increase of installed capacity of photovoltaic power generation in my country, many new photovoltaic power plants have widely used low-voltage split transformers in order to save capital construction investment. Compared with the general power transformer, the low-voltage split transformer has many differences. It consists of a parallel high-voltage winding and several axially or radially split low-voltage windings. The normal power transmission of the split transformer is only between the high-voltage and low-voltage windings...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an axially split transformer low-voltage winding integrally wound foil coil structure and process, which is used to solve the waste of man-hours and materials of the traditional low-voltage split coil; the oil flow channel is not smooth, which affects the temperature rise ; Winding size deviation, affecting the short-circuit resistance of the coil and other technical issues

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