ELECTRICAL STEEL SHEET HAVING INSULATING COATING, METHOD FOR OBTAINING THIS SHEET, TRANSFORMER CORE AND TRANSFORMER IN WHICH ELECTRICAL STEEL SHEET IS USED, AND METHOD FOR REDUCING DIELECTRIC LOSSES IN TRANSFORMER Russian patent published in 2021 - IPC C23C22/00 C22C38/00 H01F1/147 H01F1/18 

FIELD: electrical engineering.

SUBSTANCE: group of inventions relates to a sheet of electrical steel having an insulating coating, variants of a method for obtaining the said sheet of electrical steel, a transformer core made of the said sheet of electrical steel, and a method for manufacturing a transformer core. An electrical steel sheet having an insulating coating contains an insulating coating located on at least one of the surfaces of an electrical steel sheet and having a relative dielectric constant value at 1000 Hz less than or equal to 15.0 and a dielectric loss tangent value at 1000 Hz less than or equal to 20.0. The insulating coating includes an insulating coating layer containing hollow ceramic particles of silicon dioxide or containing a material with low dielectric losses having a dielectric loss coefficient at 1 MHz less than or equal to 0.10.

EFFECT: sheet of electrical steel with an insulating coating is obtained, having relatively small values of the dielectric constant and the tangent of the dielectric losses, used as a material for the transformer core to reduce the dielectric losses in the transformer.

10 cl, 4 dwg, 2 tbl, 2 ex