CN-122025384-A - Transformer coil and manufacturing method thereof

CN122025384ACN 122025384 ACN122025384 ACN 122025384ACN-122025384-A

Abstract

The invention relates to the technical field of transformer coils, and discloses a transformer coil and a manufacturing method thereof, wherein the transformer coil comprises a transformer iron core, a coil inner cylinder, a supporting piece and an insulated wire; the coil inner cylinder is sleeved on the periphery of the transformer core, the supporting piece comprises a plurality of limiting plates which are arranged at intervals in the circumferential direction of the coil inner cylinder, the limiting plates are connected to the outer circumferential surface of the coil inner cylinder and extend in the axial direction of the coil inner cylinder, a limiting groove is formed in one side, away from the coil inner cylinder, of each limiting plate, the non-insulated wires are wound on the outer circumference of the coil inner cylinder layer by layer and are embedded into the limiting grooves of the limiting plates, a plurality of layers of non-insulated wires are arranged in the limiting grooves of each limiting plate in the radial direction of the coil inner cylinder, a cushion block is arranged between every two adjacent layers of non-insulated wires, so that an air gap is formed between every two adjacent layers of non-insulated wires, and insulating paint is filled in the air gap, so that the heat dissipation performance of the transformer coil is effectively improved.

Inventors

ZHANG JIAYAO
SITU SHUPENG
YU HUIXIONG
FANG ZHEN
Zhen Weiyang
LI JIAXIN
HU ZIJIAN
ZHANG ZIFENG
YAN JIAMING
YANG WEIDONG
ZHANG HENG
PENG ZIPING
CHEN YONGCHANG
Yang Shuangshun
DENG YUHUI
LAI KUI

Assignees

广东电网有限责任公司江门供电局

Dates

Publication Date: 20260512
Application Date: 20260325

Claims (10)

1. A transformer coil, comprising: A transformer core; the coil inner cylinder is sleeved on the periphery of the transformer iron core; The support piece comprises a plurality of limiting plates which are arranged at intervals along the circumferential direction of the coil inner cylinder, the limiting plates are connected to the outer circumferential surface of the coil inner cylinder and extend along the axial direction of the coil inner cylinder, and a limiting groove is formed in one side, away from the coil inner cylinder, of each limiting plate; The non-insulated wires are wound on the periphery of the coil inner cylinder layer by layer and are embedded into the limiting grooves of the limiting plates, multiple layers of non-insulated wires are arranged in the limiting grooves of each limiting plate along the radial direction of the coil inner cylinder, cushion blocks are arranged between every two adjacent layers of non-insulated wires, so that air gaps are formed between every two adjacent layers of non-insulated wires, and insulating paint is filled in the air gaps.
2. The transformer coil according to claim 1, wherein the limiting plate comprises a stay body, one side of the stay body, which is close to the coil inner cylinder, is fixedly connected with the outer wall of the coil inner cylinder, one side of the stay body, which is away from the coil inner cylinder, is provided with a plurality of partition plates extending radially along the coil inner cylinder, the plurality of partition plates are arranged at intervals along the axial direction of the coil inner cylinder, and the limiting groove is formed between two adjacent partition plates.
3. The transformer coil according to claim 2, wherein the spacer comprises a first plate body, grooves matched with the partition boards are formed in two ends of the first plate body, the first plate body is arranged between two adjacent partition boards, and the two adjacent partition boards are clamped with the grooves in a matched mode.
4. The transformer coil of claim 3, wherein the spacer further comprises a second plate, the extending direction of the second plate is perpendicular to the extending direction of the first plate, the number of the second plates is plural, the plurality of second plates are disposed in a vertex angle area of one side of the first plate, which is close to the coil inner cylinder, the plurality of second plates and the first plate are formed with a clamping groove, and the uninsulated conductor is disposed in the clamping groove.
5. The transformer coil according to claim 1, wherein the number of the uninsulated wires is a plurality which is the same as the number of the limit portions, and the plurality of uninsulated wires are arranged at intervals in the axial direction of the coil inner tube.
6. A method for manufacturing the transformer coil of claim 1, comprising the steps of: s1, installing a transformer iron core at a preset position of winding equipment, and sleeving a coil inner cylinder on the periphery of the transformer iron core; S2, installing a plurality of limiting plates on the periphery of the coil inner cylinder, attaching one side of each limiting plate to the outer wall of the coil inner cylinder, and fixing the limiting plates on the outer wall of the coil inner cylinder in a fastening piece or bonding mode; S3, fixing the initial end of the non-insulated wire on the outer wall of the coil inner cylinder, driving the winding equipment to enable the coil inner cylinder to rotate, enabling the non-insulated wire to wind along the axial direction of the coil inner cylinder, and arranging the non-insulated wire in the limiting part; S4, after winding of the first layer of non-insulated wires is completed, installing a cushion block on the surface of the first layer of non-insulated wires, continuously winding the other layer of non-insulated wires in the limiting part, enabling the second layer of non-insulated wires to be abutted against one side of the cushion block, which is away from the first layer of non-insulated wires, and enabling an air gap supported by the cushion block to be formed between the first layer of non-insulated wires and the second layer of non-insulated wires; S5, repeating the step S4, after winding one layer of non-insulated wire, installing a cushion block on the outer wall of the layer of non-insulated wire for clamping, and winding the next layer of non-insulated wire until the winding of the whole coil is completed; And S6, carrying out vacuum paint dipping treatment on the preliminarily assembled transformer coil, draining after paint dipping is finished until no obvious paint liquid drops on the surface of the transformer coil, carrying out post assembly after draining, and installing copper bars, lead wires and other residual components to complete the integral assembly of the transformer coil.
7. The method of claim 6, wherein in step S3, wax is applied to the limiting portion of the limiting plate before winding, so as to facilitate embedding the non-insulated wire into the limiting portion.
8. The method according to claim 7, wherein in step S4, the winding directions of the adjacent two layers of non-insulated wires are identical, and the positions of the next layer of non-insulated wires and the previous layer of non-insulated wires in each of the limiting portions are in one-to-one correspondence and aligned.
9. The method according to claim 8, wherein in step S6, the vacuum degree is 0.08mpa to 0.1mpa, the temperature is 25 ℃ to 40 ℃ and the paint dipping time is 1.5h to 3h, so that the insulating paint is permeated into each air gap and each wire gap of the coil.
10. The method according to claim 9, wherein the step S8 is performed with a curing step, in which the transformer coil is placed in a curing oven, heated to 120-150 ℃ at a rate of 5-10 ℃ per minute, kept for 2-4 hours, and cooled to room temperature to completely cure the insulating paint.

Description

Transformer coil and manufacturing method thereof Technical Field The invention relates to the technical field of transformer coils, in particular to a transformer coil and a manufacturing method thereof. Background In the research and development and production field of power transformers, transformer coils are used as core components for realizing electromagnetic energy conversion, the structural design and winding process of the transformer coils directly determine the operation efficiency, heat dissipation performance and overload capacity of equipment, the winding of the transformer coils adopts wires coated with insulating layers as winding base materials, the winding process follows the principle of stacking layer by layer, namely, the insulating wires are wound on the coils according to a preset number of turns and an arrangement mode, no additional heat dissipation gap or heat insulation and heat conduction structural design exists between two adjacent layers of wires, and a wire body and an insulating layer of the wire body are directly attached up and down and are tightly laminated, so that a solid coil winding with a compact structure is finally formed. At present, the coil manufactured by stacking insulated wires layer by layer in the prior art has the defects that an insulating layer on the surface of the wire is a poor conductor of heat, joule heat generated by the wire can be dissipated only by penetrating through the insulating layer when the equipment operates, heat transfer thermal resistance is greatly increased, heat is easily accumulated in a wire body, adjacent wire layers are tightly attached, the effective heat dissipation area of the wire in contact with air is greatly compressed, only the outer surface of the coil can realize convective heat exchange, the heat of the inner multi-layer wire is difficult to rapidly lead out, a sealed heat blocking area is easily formed between the stacked wire layers, the accumulated heat is repeatedly conducted between the layers, and the overall temperature of the coil is further increased. Disclosure of Invention The invention aims to provide a transformer coil and a manufacturing method thereof, which effectively solve the problems that a coil is formed by stacking traditional insulating layer wires layer by layer, and an insulating layer of the coil blocks heat conduction and a lap winding structure compresses heat dissipation area. The invention provides a transformer coil which comprises a transformer core, a coil inner cylinder, a supporting piece and non-insulated wires, wherein the coil inner cylinder is sleeved on the periphery of the transformer core, the supporting piece comprises a plurality of limiting plates which are arranged at intervals along the periphery of the coil inner cylinder, the limiting plates are connected to the periphery of the coil inner cylinder and extend along the axial direction of the coil inner cylinder, a limiting groove is formed in one side, away from the coil inner cylinder, of each limiting plate, the non-insulated wires are wound on the periphery of the coil inner cylinder layer by layer and are embedded into the limiting grooves of the limiting plates, a plurality of layers of non-insulated wires are arranged in the limiting groove of each limiting plate in the radial direction of the coil inner cylinder, a cushion block is arranged between every two adjacent layers of non-insulated wires, so that an air gap is formed between every two adjacent layers of non-insulated wires, and insulating paint is filled in the air gap. In one embodiment, the limiting plate comprises a stay body, one side of the stay body, which is close to the coil inner cylinder, is fixedly connected with the outer wall of the coil inner cylinder, one side, which is away from the coil inner cylinder, of the stay body is provided with a plurality of radially extending partition plates of the coil inner cylinder, the partition plates are arranged along the axial interval of the coil inner cylinder, and a limiting part is formed between two adjacent partition plates. In one embodiment, the cushion block comprises a first plate body, grooves matched with the partition boards are formed in two ends of the first plate body, the first plate body is arranged between two adjacent partition boards, and the two adjacent partition boards are clamped with the grooves in a matched mode. In one embodiment, the cushion block further comprises a plurality of second plate bodies, the plurality of second plate bodies are arranged in the vertex angle area of one side, close to the coil inner cylinder, of the first plate body, the plurality of second plate bodies and the first plate body are provided with clamping grooves, and the insulated wires are arranged in the clamping grooves. In one embodiment, the number of the non-insulated wires is the same as the number of the limiting parts, and the non-insulated wires are arranged at intervals along the axia