Asymmetric insulation lead

Abstract

The invention discloses an asymmetric insulation lead, and is applied to a dry type transformer epoxy resin cast type coil. The asymmetric insulation lead comprises an inner core, insulation paper and a fixation wire, wherein the insulation paper is arranged at the surface of one side of the inner core, and the fixation wire is wound at the outer side of the insulation paper for fixing the insulation paper on the inner core. By using the asymmetric insulation lead provided by the invention, the insulation paper cushioned on the surface of the asymmetric insulation lead can serve as interlayer insulation of a coil, and an interlayer insulation material does not have to be laid and cushioned for winding of the coil. Since the coil is free from such interlayer insulation materials as non-woven fabrics or glass fiber ribbons and the like, the deep layer of the coil tends to be dry, the drying time is shortened, an epoxy resin can easily penetrate into the coil in a cast process, the cast time is shortened, and the manufacturing time of the coil is also reduced.

Description

technical field [0001] The invention relates to the technical field of coil wires, in particular to an asymmetric insulated wire. Background technique [0002] At present, the manufacture of known cast epoxy resin coils of dry-type transformers needs to go through winding, drying, pouring and curing processes. The coil is a segmented layer structure. A coil is generally divided into 4 to 8 segments, and the number of layers in each segment is 9 to 11 layers. The layers are supplemented by non-woven fabrics or glass fiber tapes for interlayer insulation. Due to the large number of layers, the interlayer insulation of the auxiliary pad takes up a lot of man-hours; the coil is not easy to dry in the deep layer due to the interlayer insulation material of the auxiliary pad, resulting in long drying time and high power consumption; when vacuum casting, the epoxy resin needs to pass through the layers. The inter-insulation material penetrates into the deep layer, the penetration ...

AI Technical Summary

Problems solved by technology

Due to the large number of layers, the interlayer insulation of the auxiliary pad takes up a lot of man-hours; the coil is not easy to dry in the deep layer due to the interlayer insulation material of the auxiliary pad, resulting in long drying time and high power consumption; when vacuum casting, the epoxy resin needs to pass through the layers. The inter-insulation material penetrates into the deep layer, the penetration is slow, and the pouring time is long

It can be seen that the entire manufacturing time of the coil is longer due to the insulation between the auxiliary pad layers, the energy consumption is larger, and the production cost is higher.

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