Vertical closed iron yoke end ring for transformer and manufacturing method thereof

Abstract

The invention provides a vertical closed iron yoke end ring for a transformer and a manufacturing method thereof. The end ring includes an outer closed tube, an inner tube with more than two layers arranged in the outer closed tube, and an inner tube for bonding between layers. layer of glue. The method includes ①calculating the unfolded perimeter of the outer closed tube and each inner tube; ②making the outer closed tube; ③adding 1 mm length cutting to the cardboard of each inner tube on the basis of the theoretically calculated perimeter; ④ Spread the glue layer on the inner end surface of the outer closed tube; ⑤Set the outermost inner tube in the outer closed tube; ⑥In the same way, set the remaining inner tubes sequentially from outside to inside; After the inner layer tube of the first layer is set, a support made of cardboard that is in close contact with the inner wall of the inner layer tube located on the innermost layer is set; ⑧The product is put into the oven for regular drying, and the support made of cardboard is taken out after completion. The invention can reduce the manufacturing cost of the end ring, shorten the manufacturing period and improve the electrical performance of the end ring.

Description

technical field

[0001] The invention relates to the technical field of transformer components, in particular to a vertical closed iron yoke end ring for a transformer and a manufacturing method thereof. Background technique

[0002] The iron core, the coil (winding) wound on the iron core and the iron yoke fixed on the upper and lower ends of the iron core are the main components of the high-voltage or ultra-high-voltage transformer. For purposes such as insulation distance between ends, iron yoke end rings must be used to isolate the upper and lower ends of the coil. There are two types of iron yoke end rings commonly used at present, one is a flat iron yoke end ring made of paper ring bonding pads, and the other is a vertical iron yoke end ring made of multiple sheets of cardboard bonded together. The vertical iron yoke end ring has two structures: open type and closed type. The vertical iron yoke end ring is generally made by fixing the cardboard on the mold and applying...

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