Body insulation structure of dry-type transformer with three-dimensional rolled iron core and manufacturing process thereof

Abstract

The invention discloses a body insulation structure of a dry-type transformer with a three-dimensional rolled iron core. An insulating cylinder is fixed on low-voltage coils or high-voltage coils and is formed by winding insulating thin plates and preimpregnatde insulating material; the insulating cylinder is supported and fixed by more than three stays; and the coils are tightly pressed by more than three packing blocks, evenly distributed on the circumferences of the upper end surface and the lower end surface of each pair of the coils and fixed by compression screws fixed on a clamping piece of the transformer in a pressing manner. The invention solves the technical problem that the complete closed insulating cylinder cannot be sleeved between the high-voltage coils since the iron coreis sealed, reduces the thickness of the insulating cylinder by 70 percent and the cost of the insulating cylinder by 70 percent, not only simplifies the manufacturing process of the insulating cylinder, but also enhances the insulating property, shortens the production cycle, reduces the manufacturing cost, has attractive appearance and changes the distribution of soft / hard lumps on the circumferences at the upper ends and the lower ends of the coils so that the coil stress is uniform and the product stability and the property against impulsive short circuiting are enhanced.

Description

technical field [0001] The invention relates to a body insulation structure of a three-phase transformer and a manufacturing process thereof, belonging to the technical field of electric power equipment. Background technique [0002] The traditional laminated dry-type transformer is to wind the high and low coils first, and then put them together with the insulating tube on the core column that can open the iron core yoke, while the three-dimensional wound core (including planar wound core) dry-type transformer The iron core is closed, and the high and low coils must be wound directly on the iron core with a special winding machine, and the complete insulating tube cannot be placed between the coils and positioned. The usual method is: cut two designed 3-4mm thick insulating tubes that can be fitted with each other in half, and then put them on the core column, and then stagger the joints of the two insulating tubes by 90° to increase the creepage distance. . In this way, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the most critical problems of body insulation and coil force unevenness in the body structure of the three-dimensional wound core dry-type transformer, thereby simplifying the process, improving insulation performance, shortening the long production cycle, and reducing the manufacturing cost. High cost, beautiful appearance, change the distribution of pads on the circumference of the upper and lower ends of the coil, so that the coil is evenly stressed, and improve product stability and sudden short-circuit resistance

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