IRON CORE OF TRANSFORMER Russian patent published in 2021 - IPC H01F1/16 H01F27/245 C21D8/12 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering. At least one of the plurality of transformer iron grain grain oriented electrical steel sheets stacked has: 1) a region in which trailing domains are formed in a direction intersecting the rolling direction and a region in which trailing domains are not formed; 2) the relative area R₀ from 0.10 to 3.0%, and the relative area R₀ is defined as the ratio of S₀ to S; 3) the relative area R_1a, which is 50% or more, and the relative area R_1a is defined as the ratio of S_1a to S₁, where S is the leaf area, S₁ is the area of ​​the region in which the closing domains are formed, S₀ is the area of ​​the region in which the closing domains are not formed. domains, and S_1a is the area of ​​the zone that is in the region of formation of the closing domains and in which the expansion value at the point of maximum deformation when magnetization is carried out in the rolling direction, with a maximum magnetic induction of 1.7 T and a frequency of 50 Hz, at least 2 × 10^-7 is greater than the expansion amount in the region in which no trailing domains are formed.

EFFECT: invention is aimed at suppressing the magnetostrictive vibration of the iron core due to mutual interference to reduce the noise level of the transformer.

3 cl, 10 tbl, 14 dwg