Method for preventing rebound of coil when iron core sheet inserting

Abstract

The invention relates to a process method for preventing a coil from rebounding when inserting a slice into a transformer iron core. The process method is characterized in that during the process of assembling slices, a certain pressure is applied continuously to the coil by the frame structure formed by an iron core draw plate and a clamp for preventing the coil from rebounding and guaranteeing that the upper surface of a coil compression plate is always about 2mm lower than the lower surface of an upper yoke; in order to realize the purpose, the process method of the invention needs to be provided with a compressing device for compressing the coil and a large C-shaped block for resetting the clamp. The process method for preventing the coil from rebounding when inserting the slice into the transformer iron core has the advantages that the assembled upper yoke is flat, the joint of the iron core is small, when the width of the upper yoke slice is not less than 650mm, the slice does not reverse due to an extremely high center of gravity, that the expansion of the coil hinders the insertion of the slice due to absorption of moisture is not necessarily considered in the assembly course of the core and winding assembly, and the slice insertion time is relatively enough.

Description

technical field [0001] The invention relates to a method for preventing springback of a coil when an iron core insert is used, which is suitable for an iron core insert in the body assembly process of a high-voltage and large-capacity transformer, and belongs to the technical field of transformer manufacturing. Background technique [0002] In the assembly process of the transformer body, the coil is firstly put on the iron core column, and then the upper iron yoke pieces can be inserted one by one to assemble the upper iron yoke. In order to facilitate the pressing of the insert after the coil is assembled, the coil needs to be dried in the furnace before being assembled, but the coil after drying is still 20-30mm high. After the upper clamp is installed and the hydraulic cylinder is used to pressurize the coil, the clamp It is generally feasible to insert the iron yoke 1-3 stages. Since the high-voltage and large-capacity transformer coil set takes about 20 hours, it takes...

AI Technical Summary

Problems solved by technology

According to the above process, firstly, the quality of the inserts is difficult to be guaranteed, the upper iron yoke will be uneven, and the iron core joints will be large, which will cause the no-load loss and noise increase of the transformer, and at the same time, due to the body entering the furnace Drying, correspondingly increases the production cost of the product and prolongs the production cycle of the product

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