A structure and method for end insulation of a dry-type transformer

Abstract

The invention relates to a structure and method for end insulation of a dry-type transformer. An insulating end ring, which is located between the layers of insulation and abuts against the conductive foil. Use single-layer or multi-layer pre-impregnated epoxy DMD as the end ring material, cut it into the required width and wind it into a package, and then select the corresponding thickness and number of layers according to the thickness of the coil conductive foil (wire). When the coil is wound It is wound together with conductive foil (wire) and layer insulation. Compared with the prior art, the invention has the advantages of simple process, low processing cost, environmental protection and the like.

Description

technical field [0001] The invention relates to a transformer end insulation method, in particular to a structure and method for dry-type transformer end insulation. Background technique [0002] As the main insulation structure of the coil, the end insulation of the low-voltage coil of the dry-type transformer not only plays the role of insulation, but also supports the coil and other components. At present, the domestic coil end insulation is mainly divided into two methods: integral epoxy casting of the coil and end epoxy sealing. The characteristics are as follows: [0003] 1. Integral casting of the coil: the low-voltage coil adopts the epoxy casting of the end and the coil as a whole, which has good insulation and mechanical strength, good-looking appearance, safety and reliability, but it needs to make a special casting mold and pour it through special casting equipment, and The mold is not universal, and the mold is expensive. This structure has poor heat dissipati...

AI Technical Summary

Problems solved by technology

This method is relatively simple in terms of equipment and process requirements, and the cost is not high, but it is easy to leak during the end-sealing process, which requires repeated filling. After the end-sealing process, the end part needs to be polished. And the end sealing waste and the dust in the grinding process will have a certain impact on the human body and the environment

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