FIELD: electrical equipment.
SUBSTANCE: invention relates to the electrical equipment. Transformer core (49; 59) includes two piles (53, 57; 60, 61), each having a first thickness (ep1). Piles (53, 57; 60, 61) consist of one or more flat parts, the cutting direction of which is straight and either parallel or perpendicular to each other. Piles (53, 57; 60, 61) face each other and include gap (1). Flat parts are made from austenitic FeNi alloy containing Ni=30–80 % and 10 % alloying elements and having thin cubic texture {100} <001>. Direction of cutting of said flat parts is parallel to either rolling direction (DL) or transverse direction (DT). Flat parts have magnetic losses for maximum induction of 1 T less than 20 W/kg at 400 Hz. Apparent magnetostriction for maximum induction of 1.2 T is less than 5 ppm when the field is applied in the direction of the large side of the sample and this direction is parallel to the direction (DL) of rolling. At that, apparent magnetostriction for maximum induction of 1.2 T is less than 5 ppm, when field is applied in direction of large side of sample and this direction is parallel to transverse direction (DT) and is located in rolling plane. Apparent magnetostriction for maximum induction of 1.2 T is less than 10 ppm when the field is applied in the direction of the long side of the sample and this direction is parallel to the intermediate direction passing at angle of 45° to the rolling direction (DL) and the transverse direction (DT).
EFFECT: improved design of a low-frequency electric transformer.
19 cl, 11 dwg, 5 tbl
