A resin-poured insulating cylinder structure for a dry-type transformer

Abstract

The utility model discloses a resin casting insulation cylinder structure for dry-type transformer, including insulation outer wall and insulation inner wall, and the insulation cavity is formed between insulation outer wall and insulation inner wall, at least one layer of glass fiber grid layer is placed in the insulation cavity, the insulation cavity is filled with insulation epoxy resin, and the insulation epoxy resin penetrates into the gap of glass fiber grid layer. The resin casting insulation cylinder structure of the utility model has good mechanical strength, does not deform in the use process, can well control the insulation distance of high voltage and low voltage, and the raw material for manufacturing the insulation cylinder is consistent with the insulation material of the high voltage coil, and the dielectric constant is same, so that the electric field distribution between the transformer coils is more uniform, the withstand voltage strength is high, the electrical insulation performance requirement between the high voltage and low voltage of the transformer can be satisfied, the safety and service life of the transformer operation are guaranteed, and the manufacturing cost of the resin casting insulation cylinder is lower than that of the purchased glass silk winding cylinder or glass cloth cylinder or polyterephthalic acid plastic cylinder, and the economic benefit is considerable.

Description

Technical Field

[0001] This utility model relates to the technical field of dry-type transformer insulation components, and in particular to a resin-cast insulation cylinder structure for dry-type transformers. Background Technology

[0002] A transformer is a static electrical device that converts AC voltage and current of one level into voltage and current of another level at the same frequency based on the principle of electromagnetic induction. It is widely used in power transmission, power conversion and power distribution.

[0003] Dry-type transformers are widely used in key areas such as load centers due to their excellent flame retardancy, explosion-proof, and maintenance-free properties. Dry-type transformers mainly rely on solid insulation materials and air as the insulation medium to ensure electrical safety performance. When the transformer voltage is high, especially when the high and low voltage coils of 10kV and above are only insulated by air, the distance between the high and low voltage coils must be increased to maintain electrical safety. Such a structure will make the overall size of the transformer larger and increase the manufacturing cost significantly.

[0004] To reduce the distance between the high and low voltage coils, an insulating cylinder is placed between them to improve the electric field distribution. The insulating cylinder is made of glass fiber wound cylinder, glass cloth cylinder, or polyethylene terephthalate plastic cylinder, etc. The cost of using these insulating cylinders is relatively high. In addition, because the materials of these insulating cylinders are different from those of the transformer's high voltage coils, there is a difference in dielectric constant, which may cause uneven electric field distribution and easily generate partial discharge, which is detrimental to the safe operation of the transformer. Utility Model Content

[0005] The purpose of this invention is to provide a resin-cast insulating cylinder structure for dry-type transformers, which reduces the manufacturing cost of the insulating cylinder and improves the economic efficiency of transformer production while meeting electrical requirements.

[0006] To solve the above-mentioned technical problems, this utility model provides a resin casting insulating cylinder structure for dry-type transformers, including an insulating outer wall and an insulating inner wall, wherein an insulating cavity is formed between the insulating outer wall and the insulating inner wall;

[0007] At least one layer of glass fiber mesh is placed inside the insulating cavity;

[0008] The insulating cavity is filled with insulating epoxy resin, and the insulating epoxy resin penetrates into the gaps of the glass fiber mesh layer.

[0009] Preferably, the glass fiber mesh layer is rolled into a sleeve shape and placed between the insulating outer wall and the insulating inner wall.

[0010] Preferably, the glass fiber mesh layer has multiple layers, which are arranged from the inside to the outside between the insulating outer wall and the insulating inner wall.

[0011] Preferably, the insulating epoxy resin filling the insulating cavity is a two-component insulating epoxy resin.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The resin-cast insulating cylinder structure of this invention has good mechanical strength and does not deform during use, allowing for excellent control of the insulation distance between high and low voltage. Furthermore, the raw materials used to manufacture the insulating cylinder are consistent with the insulating material of the high-voltage coil, sharing the same dielectric constant. This results in a more uniform electric field distribution between the transformer coils, high withstand voltage, and meets the electrical insulation performance requirements between high and low voltage transformers, ensuring safe operation and extending the transformer's service life. Moreover, the manufacturing cost of this resin-cast insulating cylinder is lower than that of purchased glass fiber winding cylinders, glass cloth cylinders, or polyethylene terephthalate plastic cylinders, resulting in significant economic benefits. Attached Figure Description

[0014] Figure 1 This is a front view of a resin-cast insulating cylinder for a dry-type transformer provided by this utility model;

[0015] Figure 2 This is a top view of a resin-cast insulating cylinder for a dry-type transformer provided by this utility model;

[0016] Figure 3 yes Figure 2 Sectional view at point AA.

[0017] In the diagram: 1. Insulating outer wall; 2. Insulating inner wall; 3. Insulating cavity; 4. Fiberglass mesh layer; 5. Insulating epoxy resin. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0021] This utility model provides a resin-cast insulating cylinder structure for dry-type transformers. Please refer to [link / reference]. Figure 1-3 It includes an insulating outer wall 1 and an insulating inner wall 2, with an insulating cavity 3 formed between the insulating outer wall 1 and the insulating inner wall 2; at least one layer of glass fiber mesh 4 is placed in the insulating cavity 3; the insulating cavity 3 is filled with insulating epoxy resin 5, and the insulating epoxy resin 5 penetrates into the gaps of the glass fiber mesh layer 4.

[0022] Specifically, the glass fiber mesh layer 4 is rolled into a sleeve shape and placed between the insulating outer wall 1 and the insulating inner wall 2.

[0023] Furthermore, the glass fiber mesh layer 4 is provided in multiple layers, and is arranged from the inside to the outside between the insulating outer wall 1 and the insulating inner wall 2.

[0024] In this embodiment, the insulating epoxy resin 5 filling the insulating cavity 3 is a two-component insulating epoxy resin.

[0025] A resin-cast insulating cylinder is formed using a casting mold. A glass fiber mesh layer 4 of a certain thickness is wrapped around the inner mold of the casting mold according to the design requirements. Then, the glass fiber mesh layer 4 is wrapped around the outer mold. Two-component insulating epoxy resin 5 is cast under vacuum conditions in the casting equipment to allow the resin to fully penetrate into the glass fiber mesh layer 4. After high-temperature curing, the cylinder is demolded to form a rigid resin-cast insulating cylinder.

[0026] By adopting this new type of resin insulation cylinder structure for dry-type transformers, the high mechanical strength of resin casting insulation ensures it does not deform during use and allows for excellent control of the insulation distance between high and low voltage. Furthermore, the raw materials used to manufacture the insulation cylinder are consistent with the insulation material of the high-voltage coil, sharing the same dielectric constant. This results in a more uniform electric field distribution between the transformer coils, higher withstand voltage, and compliance with the electrical insulation performance requirements between high and low voltage levels, ensuring the safe operation and extended service life of the transformer. The manufacturing cost of this resin casting insulation cylinder is lower than that of purchased glass fiber winding cylinders, glass cloth cylinders, or polyethylene terephthalate (PET) plastic cylinders, resulting in significant economic benefits and enhancing the competitiveness of the business.

[0027] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A resin-cast insulating cylinder structure for a dry-type transformer, characterized in that, It includes an insulating outer wall (1) and an insulating inner wall (2), and an insulating cavity (3) is formed between the insulating outer wall (1) and the insulating inner wall (2). At least one layer of glass fiber mesh (4) is placed inside the insulating cavity (3); The insulating cavity (3) is filled with insulating epoxy resin (5), and the insulating epoxy resin (5) penetrates into the gaps of the glass fiber mesh layer (4).

2. The resin-cast insulating cylinder structure for a dry-type transformer as described in claim 1, characterized in that, The glass fiber mesh layer (4) is rolled into a sleeve shape and placed between the insulating outer wall (1) and the insulating inner wall (2).

3. The resin-cast insulating cylinder structure for a dry-type transformer as described in claim 2, characterized in that, The glass fiber mesh layer (4) has multiple layers, which are arranged from the inside to the outside between the insulating outer wall (1) and the insulating inner wall (2).

4. The resin-cast insulating cylinder structure for a dry-type transformer as described in claim 1, characterized in that, The insulating epoxy resin (5) filling the insulating cavity (3) is a two-component insulating epoxy resin.

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