Oil baffle plate structure for transformer winding

Abstract

The invention discloses an oil baffle plate structure for a transformer winding, which comprises inner oil baffle plates and outer oil baffle plates, the inner oil baffle plates and the outer oil baffle plates are respectively positioned on the inner peripheral side and the outer peripheral side of a wire cake of the transformer winding, and the inner oil baffle plates and the outer oil baffle plates are alternately distributed; the outer edge side face of the inner oil baffle plate abuts against the inner circumferential side of a wire cake of the transformer winding, and the inner edge side face of the outer oil baffle plate abuts against the outer circumferential side of the wire cake of the transformer winding. According to the invention, the oil flow path in the winding is slightly changed, and meanwhile, the temperature rise of the side edge of the wire cake at the oil baffle plate placing position is greatly improved, and it needs to be explained that the structure can improve the temperature rise of the side edge of the wire cake but influence the temperature rise of the peripheral side of the wire cake at the oil baffle plate placing position; however, the influence on the side edges of the wire cakes where the inner oil baffle plate and the outer oil baffle plate are placed is greatly smaller than the influence when the oil baffle plates are placed between the two wire cakes, so that the structure is generally more beneficial to heat dissipation of the transformer winding, and the effect is more obvious during overload.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an oil baffle structure for transformer windings. Background technique [0002] A transformer is an electrical device that exchanges electrical energy. The windings and the iron core are its two most important core components, and they are also the main heating components in the transformer, accounting for more than 80% of the total heat generation of the transformer, and the 80% of the heat is in the windings. account for more than 70%. Therefore, the winding is not only a power exchange device but also a huge heating device. If there is no heat dissipation measure, the heat cannot escape, and local overheating will be formed in the winding, and the winding will be damaged or damaged, which will affect the safe and reliable operation of the transformer, and thus affect the safety of the power grid. Therefore, the heat dissipation structure of the winding is necessary, but...

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Problems solved by technology

Among them, the "Z" shaped oil flow path in the winding is the choice of most manufacturers, and the oil baffle structure must be used in the "Z" shaped oil flow path, and the design of the oil baffle structure varies from manufacturer to manufacturer. Most of the oil baffles are placed between the two line cakes, such as patents CN112599338A and CN205789451U, etc. all adopt this structure of oil baffles. This structure is better for overall heat dissipation, but due to the horizontal The annular plate structure and these transversely arranged annular plate structures are placed between the wire cakes of the transformer winding. For the wire cakes on both sides of the oil baffle plate, the resistance of the oil passage becomes smaller due to the division of the oil passage, and the heat dissipation becomes smaller. Leading to a substantial increase in its temperature rise, the increase in temperature rise is more obvious when overloaded

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