Method for evaluating annealing effect of large-size wound iron core

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...

AI Technical Summary

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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