Class-155 acetal flat enamelled copper wire and method of producing same

Abstract

The invention provides a class-155 acetal flat enamelled copper wire which can resist high temperature and can enhance the temperature rating, reduce the loss and improve the efficiency of a transformer. The class-155 acetal flat enamelled copper wire comprises a copper conductor, and the copper conductor is externally coated with insulating paint. The class-155 acetal flat enamelled copper wire is characterized in that the insulating paint is modified polyvinyl acetal resin. The class-155 acetal flat enamelled copper wire is produced according to the following steps: the raw material of electrolytic copper is used to produce an oxygen-free copper rod; the oxygen-free copper rod is processed into the flat bare copper wire; the flat bare copper wire is polished and then is annealed under the protection of the steam; and the flat bare copper wire is coated and finally baked.

Description

(1) Technical field [0001] The invention relates to the field of enameled wire production suitable for oil-immersed transformers, in particular to a 155-grade acetal enameled copper flat wire and a production method thereof. (2) Background technology [0002] Generally, oil-immersed transformers use grade 120 acetal enamelled copper flat wires, and their insulating varnish is made of polyvinyl acetal resin with a temperature grade of 120, which has good hydrolysis resistance, transformer oil resistance and excellent adhesion. However, its temperature resistance level is low, and the transformer is subject to a high temperature limit during use. Since the bare copper flat wire in the enameled production process is mainly drawn, the surface is prone to defects such as burrs and bird skin. (3) Contents of the invention [0003] In view of the above problems, the present invention provides 155-grade acetal enamelled flat copper wire, which has a high temperature-resistant grad...

AI Technical Summary

Problems solved by technology

[0002] Generally, oil-immersed transformers use grade 120 acetal enamelled copper flat wires, and their insulating varnish is made of polyvinyl acetal resin with a temperature grade of 120, which has good hydrolysis resistance, transformer oil resistance and excellent adhesion. However, its temperature resistance level is low, and the transformer is subject to a high temperature limit during use. Since the bare copper flat wire in the enamelled production process is mainly drawn, the surface is prone to defects such as burrs and bird skin.

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