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A method for measuring and evaluating eddy current losses of wound core traction transformers

A traction transformer, eddy current loss technology, applied in the direction of instrumentation, design optimization/simulation, calculation, etc., can solve the problems that the classic formula is no longer applicable, the section width of the coiled core column is uneven, etc.

Active Publication Date: 2019-05-03
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0003] At present, the eddy current loss evaluation method of the transformer core is usually calculated according to the classical formula derived based on the one-dimensional silicon steel sheet model. formula no longer applies

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  • A method for measuring and evaluating eddy current losses of wound core traction transformers
  • A method for measuring and evaluating eddy current losses of wound core traction transformers
  • A method for measuring and evaluating eddy current losses of wound core traction transformers

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Embodiment Construction

[0046] The implementation process of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] figure 1 It is a schematic diagram of the actual cross-section of the coiled iron core in the present invention and the homogenized equivalent cross-section. Under the conditions of the initial section width of the wound core, the radius of the outer section of the core column and the thickness of the silicon steel sheet, the continuous and gradual change of the section width of the wound core during the winding process is uniformized, and the approximately circular wound core section, etc. Finally, the traditional anisotropic equivalent conductivity parameters are corrected, and a new eddy current loss calculation formula is obtained by solving the electromagnetic field, and then the eddy current loss of the wound core is evaluated, which is the basis for the traction transformer. Optimal design provides a theoretical ba...

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Abstract

The invention discloses an eddy current loss evaluation method for a wound core traction transformer. Under the condition that winding initial section width of a wound core, an outer section radius and silicon steel sheet thickness are given, continuously and gradually changed section width of the wound core is homogenized in a winding process; a traditional anisotropic equivalent conductivity parameter is corrected; and an electromagnetic field is solved to obtain a new eddy current loss calculation formula. The method has the beneficial effects that the problem that an electromagnetic fieldsolution boundary condition is difficult to determine due to the continuously and gradually changed section width of a wound core is solved through application of a homogenized modeling thought, so the eddy current loss of the wound core traction transformer is effectively predicted.

Description

technical field [0001] The invention belongs to the technical field of loss calculation and evaluation of traction power supply equipment, and in particular relates to a method for measuring and evaluating eddy current loss of a wound core traction transformer. Background technique [0002] At present, my country's electrified railway mainly adopts traction transformers with laminated core structure. Although the advent of new materials and the progress of manufacturing technology have significantly reduced the core loss, the existence of a large number of joints in the laminated core is harmful to traction transformers with low average load ratios. As far as the power supply system is concerned, the effect of loss reduction is not ideal. In response to the national call for energy conservation and emission reduction, traction transformers with wound core structures have gradually entered the traction power supply system. Compared with the traditional laminated core transfor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张陈擎宇郭蕾胡军杰周利军蔡君懿高仕斌吴振宇
Owner SOUTHWEST JIAOTONG UNIV