Oil-immersed coil interlayer insulation structure
By alternately setting vertical wire layers and step wire layers in the oil-immersed transformer coils and setting insulating layers therebetween, the problem of increasing winding difficulty and increasing coil size of the flat tail pad is solved, and cost savings and simplification of the winding process are achieved.
Patent Information
- Application Number
- CN202422364218.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-27
AI Technical Summary
In the existing oil-immersed transformer coil structure, the placement of the flat tail pad increases the difficulty of winding, which may hinder the oil channel. The segmented multi-layer cylindrical coil structure leads to an increase in the axial size of the coil and an increase in the amount of wires, which is costly.
The vertical wire layer and step wire layer are arranged alternately, and the flat tail pad is cancelled, and the adjacent layers are arranged through the insulating layer. The wire layer group includes multiple groups of vertical wire layers and step wire layers. The thickness of the insulating layer is adjusted with the change of the number of turns, simplifying the winding process and saving costs.
The coil winding length is shortened, cost savings, simplified winding process, and avoiding the oil channel obstacles that may be caused by flat tail pads.
Smart Images
Figure CN223273105U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformers, and in particular relates to an oil-immersed coil interlayer insulation structure. Background Art
[0002] A transformer generally includes an iron core and a coil structure wound around the outside of the core. For oil-immersed transformers below 35kV, a multi-layer cylindrical coil structure is often used. This structure includes a conductor layer composed of coil wire and an insulation layer that isolates adjacent conductor layers. The thickness of the insulation layer depends on the voltage difference between adjacent conductor turns. When the voltage difference is large and the insulation layer is thick, the coil structure increases in size, which is not conducive to heat dissipation. To reduce the interlayer voltage of the high-voltage coil and increase the heat dissipation area of the coil, a segmented multi-layer cylindrical coil structure is generally adopted. However, the winding process of the high-voltage coil portion of the segmented multi-layer cylindrical coil structure is relatively cumbersome. To ensure the insulation distance between the two ends or in the middle of multiple sections, gaps must be reserved between the coil sections of the high-voltage coil, resulting in an increase in the axial size of the coil, an increase in the amount of wire used, and an increase in cost. A set of flat tail pads must be inserted in the gaps for isolation. Therefore, multiple sets of flat tail pads are present in the high-voltage coil, increasing the difficulty of the winding process. Improper placement of the flat tail pads may also block the oil channel. Utility Model Content
[0003] The utility model aims to provide an oil-immersed coil interlayer insulation structure, aiming to solve the problem that the placement of the horizontal tail pad increases the difficulty of winding and may block the oil channel.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide an oil-immersed coil interlayer insulation structure, comprising: an iron core, a wire layer group and an insulating layer, the wire layer group comprising a vertical wire layer and a stepped wire layer, the vertical wire layer being wound on the outside of the iron core, the stepped wire layer being wound on the outside of the vertical wire layer, the vertical wire layer and the stepped wire layer being alternately arranged and wound from the 1st layer to the Nth layer, the insulating layer comprising multiple layers of insulating paper, the insulating layer being arranged between the vertical wire layer and the stepped wire layer of adjacent layers.
[0005] In a possible implementation, the lower end of the vertical wire layer of the first layer is connected to the lower end of the stepped wire layer of the second layer, and the upper end of the stepped wire layer of the second layer is connected to the upper end of the vertical wire layer of the third layer.
[0006] In a possible implementation, the distance between the stepped conductor layer and the iron core gradually increases as the corresponding difference in number of turns between the vertical conductor layer and the stepped conductor layer increases.
[0007] In a possible implementation, the thickness of the insulating layer between the vertical wire layer and the stepped wire layer of the same wire layer group gradually increases as the corresponding difference in number of turns between the vertical wire layer and the stepped wire layer increases.
[0008] In a possible implementation, the thickness of the insulating layer between the stepped conductive layer and the vertical conductive layer of adjacent conductive layer groups gradually decreases as the corresponding difference in number of turns between the vertical conductive layer and the stepped conductive layer increases.
[0009] In a possible implementation, the structures of the multiple groups of conductive line layer groups are consistent.
[0010] In a possible implementation, the thicknesses of the insulating layers of the same conductor layer group are L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15, L16, L17, L18, L19, L20, L21, L22, L30, L31, L42, L53, L54, L65, L71, L n The thickness of the insulating layer between adjacent conductive layer groups is L from bottom to top. n ~L2, L1.
[0011] In a possible implementation, the ladder conductive line layer includes n groups of vertical ladder conductive line groups.
[0012] The beneficial effects of the oil-immersed coil interlayer insulation structure provided by the utility model are:
[0013] Compared with the prior art, an iron core, a wire layer group and an insulating layer are provided, and multiple wire layer groups are provided. Each wire layer group includes a vertical wire layer and a stepped wire layer. The stepped wire layer of the wire layer group in the same group is wound on the outside of the vertical wire layer. The coil structure is composed of alternating vertical wire layers and the stepped wire layers from the first layer close to the iron core to the Nth layer farthest from the iron core. An insulating layer is provided between adjacent vertical wire layers and the stepped wire layers. The flat tail pad is eliminated, the height of the wire layer group is reduced, the length required for coil winding is shortened, and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0015] Figure 1 This is a structural schematic diagram of the oil-immersed coil interlayer insulation structure provided by an embodiment of the present utility model.
[0016] In the figure: 1. Vertical conductor layer; 2. Step conductor layer; 3. Insulation layer. DETAILED DESCRIPTION
[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0018] Please refer to Figure 1 A specific embodiment of an oil-immersed coil interlayer insulation structure provided by the utility model is now described. The structure includes an iron core, a conductor layer group, and an insulating layer 3. The conductor layer group includes a vertical conductor layer 1 and a stepped conductor layer 2. The vertical conductor layer 1 is wound on the outside of the iron core, and the stepped conductor layer 2 is wound on the outside of the vertical conductor layer 1. The vertical conductor layers 1 and the stepped conductor layers 2 are alternately arranged and wound from the 1st layer to the Nth layer. The insulating layer 3 includes multiple layers of insulating paper and is arranged between the vertical conductor layers 1 and the stepped conductor layers 2 of adjacent layers.
[0019] The utility model provides an oil-immersed coil interlayer insulation structure. Compared with the prior art, the utility model is provided with an iron core, a conductor layer group and an insulating layer 3. There are multiple conductor layer groups, each of which includes a vertical conductor layer 1 and a stepped conductor layer 2. The stepped conductor layer 2 of the same conductor layer group is wound on the outside of the vertical conductor layer 1. The coil structure is composed of alternating vertical conductor layers 1 and stepped conductor layers 2 from the first layer close to the iron core to the Nth layer farthest from the iron core. The insulating layer 3 is provided between adjacent vertical conductor layers 1 and stepped conductor layers 2. The flat tail washer is eliminated, the height of the conductor layer group is reduced, the length required for coil winding is shortened, and the cost is saved.
[0020] For details, please refer to Figure 1 , including an iron core, a wire layer group and an insulating layer 3. The iron core is arranged vertically, and multiple wire layer groups are provided. The multiple wire layer groups are sleeved one by one. The wire layer group includes a vertical wire layer 1 and a step wire layer 2. The vertical wire layer 1 is arranged along the height direction of the iron core and is wound on the outside of the iron core. The step wire layer 2 of the same wire layer group is wound on the outside of the vertical wire layer 1. The step wire layer 2 is stepped. The vertical wire layer 1 and the step wire layer 2 are alternately arranged and distributed in the radial 1st to Nth layers on the outside of the iron core. The insulating layer 3 includes multiple layers of insulating paper. The insulating paper is sleeved layer by layer. The number of insulating papers is selected according to actual conditions. The insulating layer 3 is arranged between the vertical wire layer 1 and the step wire layer 2 and is used for insulation between the wires of adjacent layers.
[0021] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1The lower end of the first vertical wire layer 1 is connected to the lower end of the second stepped wire layer 2, and the upper end of the second stepped wire layer 2 is connected to the upper end of the third vertical wire layer 1.
[0022] For details, please refer to Figure 1 , adjacent vertical wire layers 1 and ladder wire layers 2 are connected in sequence, the first layer of vertical wire layer 1 is connected to the lower end of the second layer of ladder wire layer 2, the second layer of ladder wire layer 2 is connected to the upper end of the third layer of vertical wire layer 1, and the above connection process is repeated.
[0023] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 The distance between the step conductor layer 2 and the iron core gradually increases as the corresponding difference in the number of turns between the vertical conductor layer 1 and the step conductor layer 2 increases.
[0024] For details, please refer to Figure 1 At the same height of the iron core, the conductors of the vertical conductor layer 1 and the conductors of the step conductor layer 2 are arranged adjacent to each other. It is defined that at the same height of the iron core, the difference in the number of turns between the conductors of the adjacent vertical conductor layer 1 and the conductors of the step conductor layer 2 is the corresponding turn difference. The distance between the step conductor layer 2 and the iron core is related to the corresponding turn difference between the vertical conductor layer 1 and the step conductor layer 2 at this height. In the height direction of the iron core, as the corresponding turn difference between the vertical conductor layer 1 and the step conductor layer 2 increases, the distance between the step conductor layer 2 and the vertical conductor layer 1 in the same conductor layer group gradually increases.
[0025] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 The thickness of the insulating layer 3 between the vertical wire layer 1 and the stepped wire layer 2 of the same wire layer group gradually increases as the corresponding turn difference between the vertical wire layer 1 and the stepped wire layer 2 increases.
[0026] For details, please refer to Figure 1 In the height direction of the iron core, as the corresponding turn difference between the vertical conductor layer 1 and the step conductor layer 2 increases, the thickness of the insulation layer 3 between the step conductor layer 2 and the vertical conductor layer 1 of the same conductor layer group gradually increases.
[0027] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 The thickness of the insulating layer 3 between the step wire layer 2 and the vertical wire layer 1 of adjacent groups of wire layers gradually decreases as the corresponding difference in number of turns between the vertical wire layer 1 and the step wire layer 2 increases.
[0028] For details, please refer to Figure 1In the height direction of the iron core, the corresponding difference in the number of turns between the step wire layer of the first group of wire layer groups and the vertical wire layer 1 of the adjacent second group of wire layer groups increases, and the thickness of the insulating layer 3 between the step wire layer 2 of the first group of wire layer groups and the vertical wire layer 1 of the adjacent second group of wire layer groups gradually decreases.
[0029] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 , the structures of multiple groups of wire layers are consistent.
[0030] For details, please refer to Figure 1 , the structure of each group of wire layers is consistent.
[0031] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 The thickness of the insulation layer 3 of the same conductor layer group is L1, L2 to L n The thickness of the insulating layer 3 between adjacent wire layer groups is L from bottom to top. n ~L2, L1.
[0032] For details, please refer to Figure 1 The thickness of the insulating layer 3 between the step conductor layer 2 and the vertical conductor layer 1 of the same conductor layer group is L1, L2 to L n The thickness of the insulating layer 3 between the step conductor layer 2 and the vertical conductor layer 1 of the adjacent conductor layer group is L from bottom to top. n ~L2, L1.
[0033] As a specific embodiment of the oil-immersed coil interlayer insulation structure provided by the utility model, please refer to Figure 1 The ladder wire layer 2 includes n groups of vertical ladder wires.
[0034] For details, please refer to Figure 1 Each group of step conductor layers 2 includes n groups of vertical step conductors, and n groups of vertical step conductors are arranged in a step-by-step manner. Accordingly, the thickness of the insulating layer 3 between the step conductor layer 2 and the vertical conductor layer 1 of the same conductor layer group is L1, L2 to L n The thickness of the insulating layer 3 between the step conductor layer 2 and the vertical conductor layer 1 of the adjacent conductor layer group is L from bottom to top. n ~L2, L1.
[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. An oil-immersed coil interlayer insulation structure, characterized in that: It includes an iron core, a wire layer group and an insulating layer. The wire layer group includes a vertical wire layer and a stepped wire layer. The vertical wire layer is wound on the outside of the iron core, and the stepped wire layer is wound on the outside of the vertical wire layer. The vertical wire layer and the stepped wire layer are alternately arranged and wound from the 1st layer to the Nth layer. The insulating layer includes multiple layers of insulating paper and is arranged between the vertical wire layer and the stepped wire layer of adjacent layers.
2. The oil-immersed coil interlayer insulation structure according to claim 1, characterized in that: The lower end of the vertical wire layer of the first layer is connected to the lower end of the step wire layer of the second layer, and the upper end of the step wire layer of the second layer is connected to the upper end of the vertical wire layer of the third layer.
3. The oil-immersed coil interlayer insulation structure according to claim 1, characterized in that: The distance between the stepped conductor layer and the iron core gradually increases as the corresponding difference in number of turns between the vertical conductor layer and the stepped conductor layer increases.
4. The oil-immersed coil interlayer insulation structure according to claim 3, characterized in that: The thickness of the insulating layer between the vertical conductive layer and the stepped conductive layer of the same conductive layer group gradually increases as the corresponding difference in number of turns between the vertical conductive layer and the stepped conductive layer increases.
5. The oil-immersed coil interlayer insulation structure according to claim 4, characterized in that: The thickness of the insulating layer between the stepped conductive layer and the vertical conductive layer of adjacent conductive layer groups gradually decreases as the corresponding difference in number of turns between the vertical conductive layer and the stepped conductive layer increases.
6. The oil-immersed coil interlayer insulation structure according to claim 5, characterized in that: The structures of the multiple groups of conductive line layers are consistent.
7. The oil-immersed coil interlayer insulation structure according to claim 6, characterized in that: The thickness of the insulating layer of the same conductor layer group is L1, L2 to L n The thickness of the insulating layer between adjacent conductive layer groups is L from bottom to top. n ~L2, L1.
8. The oil-immersed coil interlayer insulation structure according to claim 7, characterized in that: The ladder conductive line layer includes n groups of vertical ladder conductive line groups.