Paper-insulating copper-silver alloy transposition semi-hard conducting wire wrapped by self-sticking ethylidene ether lacquer

Abstract

The invention relates to a paper-insulating copper-silver alloy transposition semi-hard conducting wire wrapped by self-sticking ethylidene ether lacquer. The semi-hard conducting wire has good electric and mechanical performance and good thermal bonding strength. The yield stress of the semi-hard conducting wire after long-time high temperature work does not change obviously, thereby ensuring the safety of long-time high temperature work. The semi-hard conducting wire comprises a lacquered wire and a piece of insulating paper, wherein the insulating paper wraps the outside of the lacquered wire; the lacquered wire comprises a metal conductor and a lacquer film. The lacquer film layer comprises a base lacquer layer and a surface lacquer layer. The base lacquer layer is coated outside the metal conductor. The surface lacquer layer is coated outside the base lacquer layer. The semi-hard conducting wire is characterized in that the metal conductor is a copper-silver alloy conductor.

Description

(1) Technical field [0001] The invention relates to the technical field of transposition wires for power transformers, in particular to paper-insulated self-adhesive acetal enamelled copper-silver alloy transposition semi-rigid wires. (2) Background technology [0002] At present, paper-insulated self-adhesive acetal enamelled copper-silver alloy transposed semi-rigid wires are used for power transformers, and the yield strength σ0.2≥120N / mm 2 , up to 260N / mm 2 , under the normal operation of the power transformer, the ambient temperature of the transformer is about 98 ℃ ~ 105 ℃. The main reason for the damage of high-voltage and ultra-high-voltage transformers in my country is short circuit caused by coil deformation, and the main reason for coil deformation is after long-term operation. The strength of the coil cannot meet the design and operation requirements. When a short circuit occurs, the coil cannot withstand the impact force of the short circuit, resulting in seriou...

AI Technical Summary

Problems solved by technology

[0002] At present, paper-insulated self-adhesive acetal enamelled copper-silver alloy transposed semi-rigid wires are used for power transformers, and the yield strength σ0.2≥120N / mm 2 , up to 260N / mm 2 , under the normal operation of the power transformer, the ambient temperature of the transformer is about 98 ℃ ~ 105 ℃. The main reason for the damage of high-voltage and ultra-high-voltage transformers in my country is short circuit caused by coil deformation, and the main reason for coil deformation is after long-term operation. The strength of the coil cannot meet the design and operation requirements. When a short circuit occurs, the coil cannot withstand the impact force of the short circuit, causing serious deformation of the coil

In addition, when wrapping with paper-wrapped copper flat wire, see figure 2 , the outermost layer 6 and the innermost layer 7 adopt overlapping winding, and the rest of the middle layer 8 adopts the form of gap winding, the structure is complex, the space utilization rate of the transformer winding is low, and the transformer volume is large

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