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A Method for Evaluation of Annealing Effect of Large Wound Core

A coiled core and annealing technology, which is applied in the field of evaluation of the annealing effect of large coiled cores, can solve the problems of no coiled core loss evaluation, etc., and achieve the effect of improving energy saving and annealing process

Active Publication Date: 2019-07-12
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

After the annealing is completed, the annealing effect of the core is judged by measuring the loss of the wound core and comparing it with the empirical formula. However, since the empirical formula is usually based on the laminated core, there is a certain difference from the wound core. At present, there is no empirical formula dedicated to the loss evaluation of the wound core. , especially for wound cores with variable winding strip width

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  • A Method for Evaluation of Annealing Effect of Large Wound Core
  • A Method for Evaluation of Annealing Effect of Large Wound Core
  • A Method for Evaluation of Annealing Effect of Large Wound Core

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0029] figure 1 It is a schematic cross-sectional view perpendicular to the winding path in the present invention. In the winding process, in order to ensure that the cross-section of the core column is approximately circular, the width of the laminations needs to be gradually changed to meet the needs of transformer coil winding. However, this will cause the cross-sectional area of ​​the silicon steel sheet to gradually increase, and the resistance will change accordingly.

[0030] figure 2 It is the flow chart of the annealing embodiment of medium and large coiled iron core in the present invention:

[0031] 1) Obtain the parameters of the large wound core to be annealed, including the cross-sectional area S of the core, the thickness d of a single silicon steel lamination, the number of laminations 2k, and the outer section radius r of th...

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Abstract

The invention discloses a method for evaluating the annealing effect of a large-size wound iron core. The method comprises the steps: carrying out the annealing of different types of wound iron cores,and measuring the no-load loss of the wound iron cores after annealing; deducing a resistance definition equation of a silicon steel strip in a winding direction based on the length of a winding pathand sections of the iron cores, and calculating a theoretical power value; finally comparing an experiment value and a theoretical value, and judging the annealing technical effect of the iron cores.The method can achieve the effective evaluation of the annealing effect of the iron cores, can achieve the further improvement of the existing annealing technology according to an evaluation result,facilitates the improvement of the annealing technology of the iron cores, and improves the energy-saving effect of a transformer.

Description

technical field [0001] The invention belongs to the technical field of detecting the annealing effect of a large-scale traction transformer iron core, and in particular relates to a method for evaluating the annealing effect of a large-scale coiled iron core. Background technique [0002] The transformer is one of the core equipment of the power supply and transformation system, and the no-load loss is one of the main losses of the transformer. Compared with the traditional stacked core transformer, the wound core transformer has the advantages of small size, seamless, low noise, etc., especially It can effectively reduce the no-load loss of the transformer, and can effectively improve the economy of the power supply and transformation system. The annealing process of the coiled iron core is an important link in the production process of the iron core. Since the coiled iron core is an oriented cold-rolled silicon steel sheet strip with a certain shape and length, the iron co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 郭蕾吴振宇张陈擎宇蔡君懿江俊飞周利军高仕斌
Owner SOUTHWEST JIAOTONG UNIV
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