WO2023124608A1 - 一种弹性绝缘体全包封的干式变压器绕组结构及制造方法 - Google Patents

一种弹性绝缘体全包封的干式变压器绕组结构及制造方法 Download PDF

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WO2023124608A1
WO2023124608A1 PCT/CN2022/132313 CN2022132313W WO2023124608A1 WO 2023124608 A1 WO2023124608 A1 WO 2023124608A1 CN 2022132313 W CN2022132313 W CN 2022132313W WO 2023124608 A1 WO2023124608 A1 WO 2023124608A1
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winding
dry
type transformer
coil
coils
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PCT/CN2022/132313
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English (en)
French (fr)
Inventor
张志立
沈山林
邵传益
潘明
宋云翔
李德阁
金士凯
顾小虎
张兴旺
杨庆福
张晓同
陈丽红
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上海置信电气有限公司
中国电力科学研究院有限公司
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Publication of WO2023124608A1 publication Critical patent/WO2023124608A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/33—Arrangements for noise damping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding

Definitions

  • the invention relates to a winding structure and a manufacturing method of a dry-type transformer fully encapsulated by elastic insulators, and belongs to the technical field of dry-type transformers.
  • non-encapsulated impregnated type is an insulation system composed of electromagnetic wire insulation and air gap, and the transformer is slightly larger.
  • the epoxy resin pouring type and wrapping type are both encapsulated by epoxy resin, and the insulation performance is stable, but the epoxy resin is a rigid body after curing, and there is a hidden danger of cracking in extreme climates with large temperature differences.
  • the purpose of the present invention is to overcome the deficiencies in the prior art, and provide a dry-type transformer winding structure and manufacturing method fully enclosed by elastic insulators, which can simplify the difficulty of winding manufacturing, achieve the purpose of optimizing heat dissipation and improving quality, and reduce costs at the same time .
  • a number of intermediate pads are arranged between adjacent coils
  • Both ends of the winding are respectively provided with a number of end spacers, and the end spacers are arranged along the center around the outer circumference of the column;
  • the end pads, coils, intermediate pads and center post are encapsulated with elastic insulators.
  • the central surrounding column is a hollow cylinder, and a number of exhaust holes are provided on its circumferential side wall;
  • a plurality of cooling channels extending axially along the winding are evenly distributed around the winding, and the cooling channels run through each coil.
  • the coil is a pie coil or a layer coil.
  • the heat dissipation channel can be set according to the heat dissipation requirements, for small
  • the heat dissipation air duct may not be provided.
  • intermediate pads between adjacent coils are arranged on the same plane, and several end pads at each end of the winding are arranged on the same plane; the intermediate pads and the end pads on the same horizontal plane
  • the blocks are distributed evenly around the column around the center.
  • the longitudinal section of the middle pad is "L"-shaped, including a short plate and a long plate, and the surface of the long plate is perpendicular to the central winding column and placed on the lower coil of the two adjacent coils.
  • the short plate It is pasted on the peripheral side of the central winding column, and each coil is wound on the short board.
  • the central winding column, the middle spacer, the end spacer and the elastic insulator are made of silicone rubber, and the Shore hardness is greater than 70°.
  • an adhesion layer is provided between the end pads, the coil, the middle pad and the elastic insulator.
  • a method for manufacturing a dry-type transformer winding structure fully encapsulated by an elastic insulator comprising the following steps:
  • a mold is installed outside the winding structure where the coil winding and pad installation are completed, the liquid material of the elastic insulator is poured into the mold and the elastic insulator is solidified, and the packaged dry-type transformer winding is obtained.
  • multiple groups of air channel plates extending axially along the winding are evenly arranged along the circumference of the winding, and the outer circumference of the air channel plates is wrapped with a permeable insulator; after the elastic insulator is packaged and solidified, the air channel The plates are taken out so that the heat dissipation channels extending along the axial direction of the winding are formed where each group of air channel plates were originally placed.
  • an adhesion-promoting primer is coated on the surfaces of the end block, the coil and the middle block.
  • the invention provides an elastic insulator-encapsulated dry-type transformer winding structure, which does not require the protection and support of rigid inner cylinders, end rings, and comb-shaped stays, improves compatibility with elastic insulators, optimizes the heat dissipation structure, and enables the transformer to have Good high temperature resistance and noise reduction effect, while shortening the production period and effectively reducing costs.
  • the elastic insulator in the winding of the invention can be effectively filled and fused, so that the transformer has good temperature resistance and noise reduction qualities.
  • Fig. 1 shows the structure schematic diagram of an embodiment of the dry-type transformer winding structure fully encapsulated by the elastic insulator of the present invention
  • Fig. 2 is a schematic axial cross-sectional view of a dry-type transformer winding structure fully encapsulated by an elastic insulator in Fig. 1;
  • Fig. 3 is a schematic diagram of a tiled structure around a center column in an embodiment of a dry-type transformer winding structure fully encapsulated by an elastic insulator of the present invention
  • Fig. 4 shows a schematic diagram of the structure of an intermediate spacer in an embodiment
  • Fig. 5 is a schematic structural diagram of a second embodiment of a dry-type transformer winding structure fully enclosed by an elastic insulator according to the present invention.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.
  • a dry-type transformer winding structure fully encapsulated by an elastic insulator includes a hollow cylindrical central winding column 1, and the central winding column 1 of this embodiment is formed by curling a silica gel plate, referring to Figure 3 As shown, several rows of exhaust holes are arranged on the side wall of the center column 1;
  • the outer circumference of the central winding column 1 is provided with several pie-shaped coils 3 connected in series, and several pie-shaped coils 3 constitute the winding of the transformer.
  • the two ends of the winding are respectively provided with four end spacers 2 evenly distributed along the outer circumference of the central winding column 1 .
  • the middle spacer 4 is used for partitioning between the pie-shaped coils 3, and there are 8 to 16 middle spacers 4 evenly distributed along the outer circumference of the central winding column 1 between adjacent pie-shaped coils 3, as shown in Fig. 4 ,
  • the longitudinal section of the middle spacer 4 is "L" shape, including a short board 41 and a long board 42, the short board 41 and the long board 42 are placed vertically and horizontally respectively, and the short board 41 is close to the side wall of the center column 1, and each cake
  • the type coil 3 is wound on the short plate 41 .
  • the board surface of the long plate 42 is placed on the lower pie coil 3 among the two adjacent pie coils 3 perpendicular to the central winding column 1 .
  • the end pads 2 and the middle pads 4 can be made into various fixed specifications to adapt to products of various capacities.
  • a plurality of heat dissipation passages extending along the axial direction of the winding can be evenly distributed around the winding, and each heat dissipation passage runs through each coil to improve heat dissipation of the transformer.
  • the surface of the central winding column 1, the end spacer 2, the pie-shaped coil 3 and the middle spacer 4 is encapsulated with an elastic insulator 5;
  • an adhesion layer the adhesion layer is an adhesion-promoting primer, and the adhesion layer can improve the adhesion of the elastic insulator.
  • each end pad 2 in the axial direction of the central column 1, is on the same straight line as an intermediate pad 4 in each layer, and the end pads 2 and the later transformer During assembly, the pressure block of the device body and the cushion block are in direct contact, which can form an overall fixation of the winding.
  • the central winding column 1, the middle spacer 4, the end spacer 2 and the elastic insulator 5 are preferably silicone rubber products, and the Shore hardness of the middle spacer 4 and the end spacer 2 is 70°-75°. The strength is higher, and the middle spacer 4 and the end spacer 2 can also be made of polyimide and epoxy resin molding materials with higher hardness.
  • the permeable insulator can be selected from coarse sand type glass fiber woven cloth, and the air channel plates are sandwiched between each On the radial surface of the layer coil, after the subsequent air channel plate is withdrawn, a heat dissipation air channel extending along the winding axis and penetrating each coil can be formed.
  • the middle pads 4 are placed on the lower pie coils 3 in turn, so that the long boards 42 of the middle pads 4 are laid flat on the bottom pie coils 3, and the short boards 41 are pasted.
  • use the first coil to press the short plate 41 of the middle pad 4, which can effectively prevent the middle pad 4 from loosening and falling;
  • the outer mold is installed, and the liquid material of the elastic insulator 5 is used for overall potting and solidification under vacuum pressure, and the center column 1, the end pad 2, the cake coil 3, and the middle pad 4 are encapsulated to form a complete
  • the solid winding individual, the exhaust hole can be used as the exhaust channel when the elastic insulator 5 is poured;
  • the dry-type transformer winding structure fully encapsulated by elastic insulators in this embodiment includes a hollow cylindrical central winding column 1, and several rows of exhaust holes are provided on the side wall of the central winding column 1;
  • the outer periphery of the central winding column 1 is provided with several series-connected layered coils 6, and several layered coils 6 constitute the winding of the transformer.
  • the 4-6 layer type is preferred, and the magnet wire can be polyimide enameled wire, double glass silk covered wire, polyimide film covered wire or aramid paper covered wire.
  • the two ends of the winding are respectively provided with four end spacers 2 evenly distributed along the outer circumference of the central winding column 1 .
  • the middle spacer 4 is used for partitioning between the layered coils 6, and there are 8 to 16 middle spacers 4 evenly distributed along the outer circumference of the central column 1 between the adjacent layered coils 6, and the longitudinal direction of the middle spacer 4 is
  • the cross section is "L" shape, including a short board 41 and a long board 42, the short board 41 and the long board 42 are placed vertically and horizontally respectively, the short board 41 is close to the side wall of the central winding column 1, and each layer of coils 6 is wound on On the short board 41 , the board surface of the long board 42 is placed on the lower layer coil 6 among the adjacent two-layer coils 6 perpendicular to the central winding column 1 .
  • the end pads 2 and the middle pads 4 can be made into various fixed specifications to adapt to products of various capacities.
  • the whole winding can be provided with an axial heat dissipation channel along the circumference to improve the heat dissipation of the transformer.
  • the surface of the central winding column 1, the end pad 2, the layer coil 6 and the middle pad 4 is encapsulated with an elastic insulator 5; the end pad 2, the layer coil 6, the middle pad 4 and the elastic insulator 5 are provided with There is an adhesion layer, the adhesion layer is an adhesion-promoting primer, and the adhesion layer can improve the adhesion of the elastic insulator.
  • each end spacer 2 is on the same straight line as a middle spacer 4 in each layer, and the end spacer 2 and the body pressure block when the transformer is assembled later , The pads are in direct contact, which can form the overall fixation of the winding.
  • the central winding column 1, the middle spacer 4, the end spacer 2 and the elastic insulator 5 are preferably silicone rubber products, and the Shore hardness of the middle spacer 4 and the end spacer 2 is 70°-75°. The strength is higher, and the middle spacer 4 and the end spacer 2 can also be made of polyimide and epoxy resin molding materials with higher hardness.
  • the elastic insulator-encapsulated dry-type transformer windings of the above-mentioned embodiments do not need the protective support of rigid inner cylinders, end rings, and comb-shaped stays, which improves the compatibility with elastic insulators, and has a simple structure, easy operation, and good heat dissipation. unobstructed.
  • the elastic insulator in the winding of the present invention can be effectively filled and fused, so that the transformer has good temperature resistance and noise reduction quality

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)

Abstract

本发明公开了一种弹性绝缘体全包封的干式变压器绕组结构及制造方法，干式变压器绕组结构包括中心绕柱，中心绕柱的外周套设有若干个依次串联的线圈，若干线圈构成变压器的绕组，线圈由电磁线绕制而成；相邻线圈之间设有若干中间垫块；绕组的两端分别设有若干端部垫块，端部垫块沿中心绕柱外周设置；端部垫块、线圈、中间垫块和中心绕柱表面封装有弹性绝缘体。利用本发明能够简化绕组的制作难度、优化散热、降低成本，同时弹性绝缘体得到有效填充和融合，变压器具有良好的耐温、降噪品质。

Description

一种弹性绝缘体全包封的干式变压器绕组结构及制造方法 技术领域
本发明涉及一种弹性绝缘体全包封的干式变压器绕组结构及制造方法，属于干式变压器技术领域。
背景技术
传统的干式变压器主要有三种:非包封浸渍式、环氧树脂浇注式、环氧树脂绕包式，其中非包封浸渍式是电磁线绝缘和空气间隙组成的绝缘体系，变压器体积稍大、易吸潮；环氧树脂浇注式和绕包式均为环氧树脂包封，绝缘性能稳定，但环氧树脂固化后是刚性体，温差较大的极端气候下有开裂隐患。
为解决非包封干式变压器易吸潮和环氧树脂包封干式变压器易开裂问题，弹性绝缘体包封的干式变压器被提出。但是这类产品需使用刚性的环氧玻璃纤维绝缘筒、端圈、梳形撑条作支撑保护，该结构复杂、散热差、成本高，且环氧筒、梳形撑条在后期吸潮后易出现沿面放电隐患。
发明内容
本发明的目的在于克服现有技术中的不足，提供一种弹性绝缘体全包封的干式变压器绕组结构及制造方法，能够简化绕组的制作难度，达到优化散热、提高品质的目的，同时降低成本。
为达到上述目的，本发明是采用下述技术方案实现的：
一种弹性绝缘体全包封的干式变压器绕组结构，包括中心绕柱，所述中心绕柱的外周套设有若干个依次串联的线圈，所述若干线圈构成变压器的绕组，所述线圈由电磁线绕制而成；
相邻线圈之间设有若干中间垫块；
所述绕组的两端分别设有若干端部垫块，所述端部垫块沿中心绕柱外周设置；
端部垫块、线圈、中间垫块和中心绕柱表面封装有弹性绝缘体。
可选的，所述中心绕柱为中空筒体，其周向侧壁上设有若干排气孔；
绕组周部均布设置有多个沿绕组轴向延伸的散热通道，所述散热通道贯穿各线圈。
可选的，所述线圈为饼式线圈或层式线圈。散热通道的可根据散热需要来设置，对于小
容量产品来说，若散热面积足够，则可不设置散热气道。
可选的，相邻线圈之间的若干中间垫块设置于同一平面上，绕组每一端的若干端部垫块设置于同一平面上；同一水平面上的所述中间垫块和所述端部垫块绕中心绕柱均匀分布。
可选的，所述中间垫块的纵截面呈“L”形，包括短板和长板，长板板面垂直于中心绕柱置于相邻两线圈中的下层线圈上，所述短板贴设于所述中心绕柱的周侧，各线圈绕设于短板上。
可选的，所述中心绕柱、所述中间垫块、所述端部垫块和所述弹性绝缘体为硅橡胶制品，邵氏硬度大于70°。
可选的，所述端部垫块、所述线圈、所述中间垫块与所述弹性绝缘体之间设有附着层。
一种弹性绝缘体全包封的干式变压器绕组结构的制造方法，包括以下步骤：
制作中空筒状的中心绕柱；
使用电磁线在中心绕柱外周间隔绕制相串联的若干线圈，若干线圈构成变压器的绕组，绕制过程中在相邻线圈之间安装中间垫块；
在绕组的两端安装端部垫块；
在线圈绕制及垫块安装均完成的绕组结构外装设模具，将弹性绝缘体的液态料灌注至模具内并使弹性绝缘体固化，得到封装完成的干式变压器绕组。
可选的，绕组绕制过程中，沿绕组周向均匀设置多组沿绕组轴向延伸的气道板，在气道板外周裹上渗透性绝缘体；封装且弹性绝缘体固话后，将气道板取出，使得原每组气道板放置处形成沿绕组轴向延伸的散热通道。
可选的，封装前，在端部垫块、线圈和中间垫块的表面涂覆增粘底涂剂。
与现有技术相比，本发明所达到的有益效果：
本发明提供一种弹性绝缘体包封式干式变压器绕组结构，无需刚性内筒、端圈、梳形撑条的保护支撑，提升了与弹性绝缘体的相容性，优化了散热结构，使变压器具有良好的耐高温性和降噪效果，同时缩短生产工期，有效降低成本。同时本发明的绕组中弹性绝缘体能够得到有效填充和融合，使得变压器具有良好的耐温、降噪品质。
附图说明
图1所示为本发明弹性绝缘体全包封的干式变压器绕组结构一种实施例的结构示意图；
图2所示为图1中弹性绝缘体全包封的干式变压器绕组结构的轴向剖面示意图；
图3所示为本发明弹性绝缘体全包封的干式变压器绕组结构一种实施例中的中心绕柱平铺结构示意图；
图4所示为一种实施例中的中间垫块结构示意图；
图5所示为本发明弹性绝缘体全包封的干式变压器绕组结构第二种实施例的结构示意图。
图中：1、中心绕柱；2、端部垫块；3、饼式线圈；4、中间垫块；41、短板；42、长板；5、弹性绝缘体；6：层式线圈。
具体实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”等的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以通过具体情况理解上述术语在本发明中的具体含义。
实施例1
如图1至图4所示，一种弹性绝缘体全包封的干式变压器绕组结构，包括中空筒状中心 绕柱1，本实施例的中心绕柱1采用硅胶板卷曲而成，参考图3所示，中心绕柱1侧壁上设有若干列排气孔；
如图1，中心绕柱1的外周套设有若干个串联的饼式线圈3，若干个饼式线圈3构成变压器的绕组，饼式线圈3由绕制的电磁线构成，电磁线可选用聚酰亚胺漆包线、双玻璃丝包线、聚酰亚胺膜包线或芳纶纸包线。
绕组的两端分别设有四个沿中心绕柱1外周均匀分布的端部垫块2。
中间垫块4用于饼式线圈3之间的隔断，相邻饼式线圈3之间分别设有8～16个沿中心绕柱1外周均匀分布的中间垫块4，参考图4所示，中间垫块4的纵截面呈“L”形，包括短板41和长板42，短板41和长板42分别竖直和水平放置，短板41贴近中心绕柱1的侧壁，各饼式线圈3绕设于短板41上。长板42板面垂直于中心绕柱1置于相邻两饼式线圈3中的下层饼式线圈3上。
为利于批量生产，端部垫块2和中间垫块4可以制作成多种固定规格，适应各容量产品。
根据散热需要，绕组周部可以均布设置有多个沿绕组轴向延伸的散热通道，各散热通道贯穿各线圈，用于提高变压器的散热性。
中心绕柱1、端部垫块2、饼式线圈3和中间垫块4的表面封装有弹性绝缘体5；端部垫块2、饼式线圈3、中间垫块4与弹性绝缘体5之间设有附着层，附着层为增粘底涂剂，附着层可提高弹性绝缘体的附着力。
结合图1和图2，在中心绕柱1的轴向方向上，各端部垫块2与每一层中的一个中间垫块4处于同一条直线上，加之端部垫块2与后期变压器组装时的器身压块、垫块直接接触，可形成对绕组的整体固定。
中心绕柱1、中间垫块4、端部垫块2和弹性绝缘体5优选为硅橡胶制品，中间垫块4和端部垫块2的邵氏硬度为70°-75°，若对绕组机械强度更高，中间垫块4和端部垫块2也可以采用硬度更大的聚酰亚胺、环氧类树脂成型材料加工制作。
本实施例弹性绝缘体全包封的干式变压器绕组结构的制造方法，包括以下步骤：
S1，制作中空筒状的中心绕柱1；
S2，使用电磁线在中心绕柱1外周间隔绕制相串联的若干饼式线圈3，若干饼式线圈3构成变压器的绕组，绕制过程中在相邻饼式线圈3之间安装中间垫块4；根据散热需要，还可在沿绕组一周设置多组气道板，在气道板外周裹上渗透性绝缘体，渗透性绝缘体可选择粗砂型玻纤织布，气道板被夹在每一层线圈的辐面上，使得后续气道板撤出后，能够形成沿绕组轴向延伸并贯穿各线圈的散热气道。各饼式线圈3在绕制第一匝时依次在下层饼式线圈3 上放置中间垫块4，使中间垫块4的长板42平放于下层饼式线圈3上，短板41贴设于中心绕柱1周侧，用第一圈线匝压住中间垫块4的短板41，可有效防止中间垫块4松散掉落；
S3，在绕组的两端安装端部垫块2；
S4，端部垫块2、饼式线圈3和中间垫块4的表面涂覆增粘底涂剂，即附着层；
S5，装好外模具，用弹性绝缘体5的液态料通过真空压力进行整体灌封并固化，将中心绕柱1、端部垫块2、饼式线圈3、中间垫块4包封形成完整的固态绕组个体，排气孔可作为弹性绝缘体5灌注时的排气通道；
S6，有气道板的，取出气道板，从而形成绕组散热通道，提高变压器的散热性。
实施例2
如图5所示，本实施例的弹性绝缘体全包封的干式变压器绕组结构，包括中空筒状中心绕柱1，中心绕柱1侧壁上设有若干列排气孔；
与实施例1不同的是，本实施例中中心绕柱1的外周套设有若干个串联的层式线圈6，若干个层式线圈6构成变压器的绕组，层式线圈6由绕制的电磁线构成，对于10kV级绕组优选4-6层式，电磁线可选用聚酰亚胺漆包线、双玻璃丝包线、聚酰亚胺膜包线或芳纶纸包线。
绕组的两端分别设有四个沿中心绕柱1外周均匀分布的端部垫块2。
中间垫块4用于层式线圈6之间的隔断，相邻层式线圈6之间分别设有8～16个沿中心绕柱1外周均匀分布的中间垫块4，中间垫块4的纵截面呈“L”形，包括短板41和长板42，短板41和长板42分别竖直和水平放置，短板41贴近中心绕柱1的侧壁，各层式线圈6绕设于短板41上，长板42板面垂直于中心绕柱1置于相邻两层式线圈6中的下层层式线圈6上。
为利于批量生产，端部垫块2和中间垫块4可以制作成多种固定规格，适应各容量产品。
绕组整体可沿圆周设置轴向散热通道，用于提高变压器的散热性。
中心绕柱1、端部垫块2、层式线圈6和中间垫块4的表面封装有弹性绝缘体5；端部垫块2、层式线圈6、中间垫块4与弹性绝缘体5之间设有附着层，附着层为增粘底涂剂，附着层可提高弹性绝缘体的附着力。
在中心绕柱1的轴向方向上，各端部垫块2与每一层中的一个中间垫块4处于同一条直线上，加之端部垫块2与后期变压器组装时的器身压块、垫块直接接触，可形成对绕组的整体固定。
中心绕柱1、中间垫块4、端部垫块2和弹性绝缘体5优选为硅橡胶制品，中间垫块4和 端部垫块2的邵氏硬度为70°-75°，若对绕组机械强度更高，中间垫块4和端部垫块2也可以采用硬度更大的聚酰亚胺、环氧类树脂成型材料加工制作。
以上所述实施例的弹性绝缘体包封式干式变压器绕组，无需刚性内筒、端圈、梳形撑条的保护支撑，提升了与弹性绝缘体的相容性，且结构简单、易操作，散热通畅。同时本发明的绕组中弹性绝缘体能够得到有效填充和融合，使得变压器具有良好的耐温、降噪品质
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。

Claims (10)

  1. 一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：包括中心绕柱，所述中心绕柱的外周套设有若干个依次串联的线圈，所述若干线圈构成变压器的绕组，所述线圈由电磁线绕制而成；
    相邻线圈之间设有若干中间垫块；
    所述绕组的两端分别设有若干端部垫块，所述端部垫块沿中心绕柱外周设置；
    端部垫块、线圈、中间垫块和中心绕柱表面封装有弹性绝缘体。
  2. 根据权利要求1所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：所述中心绕柱为中空筒体，其周向侧壁上设有若干排气孔；
    绕组周部均布设置有多个沿绕组轴向延伸的散热通道，所述散热通道贯穿各线圈。
  3. 根据权利要求1所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：所述线圈为饼式线圈或层式线圈。
  4. 根据权利要求2所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：相邻线圈之间的若干中间垫块设置于同一平面上，绕组每一端的若干端部垫块设置于同一平面上；同一水平面上的所述中间垫块和所述端部垫块绕中心绕柱均匀分布。
  5. 根据权利要求1所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：所述中间垫块的纵截面呈“L”形，包括短板和长板，长板板面垂直于中心绕柱置于相邻两线圈中的下层线圈上，所述短板贴设于所述中心绕柱的周侧，各线圈绕设于短板上。
  6. 根据权利要求1所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：所述中心绕柱、所述中间垫块、所述端部垫块和所述弹性绝缘体为硅橡胶制品，邵氏硬度大于70°。
  7. 根据权利要求1所述的一种弹性绝缘体全包封的干式变压器绕组结构，其特征在于：所述端部垫块、所述线圈、所述中间垫块与所述弹性绝缘体之间设有附着层。
  8. 一种权利要求2-7任意一项所述的弹性绝缘体全包封的干式变压器绕组结构的制造方法，其特征在于，包括以下步骤：
    制作中空筒状的中心绕柱；
    使用电磁线在中心绕柱外周间隔绕制相串联的若干线圈，若干线圈构成变压器的绕组， 绕制过程中在相邻线圈之间安装中间垫块；
    在绕组的两端安装端部垫块；
    在线圈绕制及垫块安装均完成的绕组结构外装设模具，将弹性绝缘体的液态料灌注至模具内并使弹性绝缘体固化，得到封装完成的干式变压器绕组。
  9. 根据权利要求8所述的一种弹性绝缘体全包封的干式变压器绕组结构的制造方法，其特征在于，还包括：绕组绕制过程中，沿绕组周向均匀设置多组沿绕组轴向延伸的气道板，在气道板外周裹上渗透性绝缘体；封装且弹性绝缘体固话后，将气道板取出，使得原每组气道板放置处形成沿绕组轴向延伸的散热通道。
  10. 根据权利要求8所述的一种弹性绝缘体全包封的干式变压器绕组结构的制造方法，其特征在于，还包括以下步骤：封装前，在端部垫块、线圈和中间垫块的表面涂覆增粘底涂剂。
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