Method for improving mechanical strength of cylindrical voltage regulation coil

Abstract

The invention discloses a method for improving the mechanical strength of a cylindrical voltage regulation coil, which relates to method for improving the mechanical strength of the cylindrical voltage regulation coil at a 90-degree bending part of a wire cake outlet head and solves the problem that the existing cylindrical voltage regulation coil is bad in mechanical strength at the 90-degree bending part of the wire cake outgoing head. The method comprises the following steps: binding and fixing an outlet wire cake of the cylindrical voltage regulation coil by using a contraction band; peeling off an original insulation layer at the 90-degree bending part of the outlet wire cake; supplementing to the thickness of the original insulation layer by using Denison insulation paper; adding a paper groove with a thickness of 0.5mm between the 90-degree bending part of the outlet wire cake and an adjacent wire coil; packing Denison insulation paper outside the paper groove, wherein the Denison insulation paper packed at the 90-degree bending part of the outlet wire cake is 50mm in length when packed inwards and 40mm in length when packed outwards; and binding the screen of the cylindrical voltage regulation coil with a PET (polyethylene glycol terephthalate) band by utilizing a PET band packing machine. The method has the advantage of improving the mechanical strength of the cylindrical voltage regulation coil at the 90-degree bending part of the wire cake outlet head.

Description

Technical field: [0001] The invention relates to a method capable of improving the mechanical strength of the 90° bend of the radial or axial line cake of a cylindrical voltage regulating coil. Background technique: [0002] The existing large-scale transformers in China all use independent voltage regulating coils, and most of them are ordinary cylindrical voltage regulating coil structures. After the wire cake is bound and fixed, the original insulation is stripped off and wrapped with ordinary crepe paper. After the whole is assembled, it is tied tightly with shrinkage tape to ensure the mechanical strength of the cylindrical voltage regulating coil. The disadvantage of this method is: because the ordinary cylindrical voltage regulating coil has a multi-parallel winding structure, the wire gauge used is small, and the external mechanical stress is very large. In the process of arranging the lead wires at the 90° bend of the radial or axial line cake of the cylindrical vo...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: because the ordinary cylindrical voltage regulating coil has a multi-parallel winding structure, the wire gauge is small, and the outward mechanical stress is very large.

In the process of arranging the lead wires at the 90° bend of the radial or axial line cake of the cylindrical voltage regulating coil, the insulation and mechanical properties of ordinary crepe paper are poor, and the tightness of the coils that are artificially bound with shrinkage tape is limited. During the operation of the transformer, a sudden short circuit may easily cause the voltage regulating coil to expand and deform, causing the insulation of the paper package to break and loose, and some copper wires to be exposed

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