Transformer iron core and production method thereof

Abstract

The invention relates to a transformer iron core and a production method thereof. A polyurethane foam layer formed by curing reaction of polyurethane foaming agents is coated on the outer surface of the iron core; by the polyurethane foam layer, sounds, generated by vibration caused by magnetostriction, of the iron core can be reduced, and sounds generated by transformer coils can be absorbed, so that transformer noise is reduced; the polyurethane foaming agents are coated on the iron core after foaming to form the compact polyurethane foam layer attached on the iron core, and the polyurethane foam layer is not prone to shedding and durable, so that input cost is reduced.

Description

technical field [0001] The invention relates to a transformer core and a manufacturing method thereof. Background technique [0002] At present, the amorphous alloy iron core of the dry-type transformer is mainly a three-phase three-column amorphous alloy iron structure. The three-phase three-column amorphous alloy iron includes a square ring-shaped outer core, and two Square ring-shaped inner iron core, each iron core is fixed and molded by resin curing agent, the inner surface and outer surface of each iron core are provided with electrical steel belts for protection, the two adjacent sides of the two inner iron cores form the second One core leg, two opposite side sides of the two inner cores are attached to the corresponding sides of the outer core respectively to form the second core leg and the third core leg, the first core leg, the second core leg and the third core leg The columns are arranged parallel and side by side, and the outer surface of the three-phase thre...

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Problems solved by technology

[0002] At present, the amorphous alloy iron core of the dry-type transformer is mainly a three-phase three-column amorphous alloy iron structure. The three-phase three-column amorphous alloy iron includes a square ring-shaped outer core, and two Square ring-shaped inner iron core, each iron core is fixed and molded by resin curing agent, the inner surface and outer surface of each iron core are provided with electrical steel belts for protection, and the two adjacent sides of the two inner iron cores form the second One core leg, two opposite sides of the two inner cores are respectively attached to the corresponding sides of the outer core to form the second core leg and the third core leg, the first core leg, the second core leg and the third core leg The columns are arranged parallel and side by side. The outer surface of the three-phase three-column amorphous alloy iron formed by the combination of the outer core and the inner core is pasted with a polyethylene material sound insulation blanket through an adhesive. The sound insulation blanket is used to suppress the noise generated when the iron core is running. However, the sound insulation blanket is fixed on the iron core with an adhesive. Since the adhesive will age during the long-term operation of the amorphous iron core, the sound insulation blanket is easy to fall off, which affects the safe operation of the transformer. The effect of sound insulation and noise reduction is not very obvious; and the price of polyethylene sound insulation blanket is expensive, which increases the production cost, and needs to be made in different sizes according to needs, which increases the inventory of products

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