Glue impregnated paper transformer bushing

Abstract

The utility model discloses an impregnated paper transformer bushing which comprises an outer insulating sheath, a fixed end ring, a high-voltage end connector, a fixed ring, an impregnated paper insulating layer and a net-shaped fiber reinforcing layer. And the impregnated paper insulating layer is arranged in the outer insulating sheath and adopts a multi-layer wrapping structure, and a high-temperature-resistant ceramic microparticle coating is arranged between the layers, so that the voltage endurance capability and the anti-aging performance are improved. And the reticular fiber reinforcement layer coats the outside of the impregnated paper insulation layer, so that the impact resistance is improved, and damage caused by mechanical stress is prevented. The outer insulating sheath is made of a silicone rubber and epoxy resin composite material, and the surface of the outer insulating sheath is provided with spiral protruding ribs, so that the creepage distance is increased, and the pollution flashover resistance is improved. By optimizing the insulation structure, strengthening the mechanical support and improving the environmental adaptability, the transformer bushing is kept stable in long-term operation, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of transformer bushing technology, specifically to a paper-impregnated transformer bushing. Background Technology

[0002] Currently, traditional paper-impregnated transformer bushings typically use a single layer or few layers of paper-impregnated insulation as the primary insulating medium, and are encapsulated with epoxy resin or ceramic materials. While this structure can meet the insulation requirements of transformers in the short term, traditional bushings often exhibit the following problems during long-term operation:

[0003] Insufficient impact resistance: Traditional paper-impregnated transformer bushings usually lack additional mechanical reinforcement measures, and are prone to cracking or local damage, especially when subjected to external impact or high voltage electrical stress, which affects their service life.

[0004] Insulation performance degradation: Traditional paper-impregnated structures are prone to dielectric strength reduction due to thermal aging or moisture intrusion. After long-term operation, insulation breakdown or partial discharge may occur, reducing the safety of the transformer.

[0005] Poor environmental adaptability: The materials of traditional transformer bushings are easily affected by the external environment in high humidity or high pollution environments, such as flashover and leakage problems caused by dust accumulation, which leads to unstable operation of the transformer.

[0006] Limited mechanical support strength: Due to the lack of an additional reinforcing layer, traditional bushings may deform under mechanical stress or temperature changes during long-term operation, affecting the reliability of the connection with the transformer body.

[0007] In view of this, we have studied and improved the existing problems to provide a paper-impregnated transformer bushing to solve the current problems. The aim of this technology is to solve the problems and improve its practical value. Utility Model Content

[0008] The present invention aims to solve the technical problems existing in the prior art or related technologies.

[0009] This utility model provides a paper-impregnated transformer bushing, including an outer insulating sheath, a fixed end ring, a high-voltage end connector, a fixed ring, a paper-impregnated insulation layer, and a mesh fiber reinforcement layer. The paper-impregnated insulation layer is disposed inside the outer insulating sheath and is covered and fixed to the mesh fiber reinforcement layer. The fixed end ring is fixedly connected to the end of the outer insulating sheath and connected to the high-voltage end connector to achieve electrical connection and mechanical fixation. The fixed ring is sleeved outside the fixed end ring to provide additional mechanical support. The high-voltage end connector is electrically connected to the end of the paper-impregnated insulation layer and uses spherical electrodes to optimize the electric field distribution. The mesh fiber reinforcement layer covers the outside of the paper-impregnated insulation layer and is fastened between the fixed end ring and the fixed ring to enhance mechanical strength.

[0010] Preferably, the impregnated paper insulation layer consists of at least five layers of impregnated paper wrapped together, with a 0.2 mm thick high-temperature resistant ceramic microparticle coating sandwiched between every two layers of impregnated paper.

[0011] Preferably, the surface of the outer insulating sheath is provided with a 2mm high spiral raised rib to increase the creepage distance.

[0012] Preferably, the mesh fiber reinforcing layer is made of carbon fiber or aramid fiber material to improve temperature resistance and mechanical impact resistance, and the outer insulating sheath is made of silicone rubber and epoxy resin composite material to enhance environmental aging resistance.

[0013] Preferably, the high-voltage connector uses a silver-plated copper busbar with a diameter of 15mm, and a spherical electrode with a diameter of 20mm is used at the high-voltage side end to optimize the electric field distribution and reduce partial discharge.

[0014] Preferably, the fixed end ring and the fixed ring are made of glass fiber reinforced composite material, and have a 2mm thick flexible silicone cushioning layer inside them.

[0015] Preferably, the fixing ring is fixed to the end of the outer insulating sheath by mechanical fastening and is provided with an arc-shaped transition structure for stress dispersion.

[0016] The impregnated paper insulation layer is located inside the outer insulation sheath and employs a multi-layer wrapping structure. High-temperature resistant ceramic microparticle coatings are applied between the layers to improve pressure resistance and anti-aging properties. The mesh fiber reinforcement layer, made of high-strength carbon fiber or aramid fiber, covers the outside of the impregnated paper insulation layer, enhancing impact resistance and preventing damage from mechanical stress during operation.

[0017] The outer insulation sheath is made of a composite material of silicone rubber and epoxy resin, and its surface is provided with spiral raised ribs to increase the creepage distance, improve the anti-pollution flashover capability, and ensure stable operation in high humidity or high pollution environments.

[0018] The high-voltage connector uses silver-plated copper busbars with spherical electrodes at the ends to ensure uniform electric field distribution, reduce partial discharge, and improve withstand voltage. The fixed end ring and the fixed ring itself are made of glass fiber reinforced composite material with a flexible silicone buffer layer embedded inside to improve the structure's stress resistance and adapt to deformation caused by temperature changes.

[0019] In summary, this utility model optimizes the insulation structure, strengthens mechanical support, and improves environmental adaptability, thereby enabling transformer bushings to maintain stability during long-term operation, extending their service life, and reducing maintenance costs.

[0020] The beneficial effects achieved by this utility model are as follows:

[0021] 1. In this utility model, the mesh fiber reinforcement layer is made of high-strength carbon fiber or aramid fiber material wrapped around the outside of the impregnated paper insulation layer, which effectively improves the impact resistance of the bushing and prevents damage caused by mechanical stress during operation.

[0022] 2. In this utility model, the impregnated paper insulation layer adopts a multi-layer wrapping structure, and a high-temperature resistant ceramic microparticle coating is set between the layers, which improves the voltage resistance and anti-aging performance. By optimizing the insulation structure, strengthening the mechanical support, and improving the environmental adaptability, the transformer bushing maintains stability during long-term operation, extends its service life, and reduces maintenance costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0024] Figure 2 This is an exploded structural diagram of one embodiment of the present invention;

[0025] Figure 3 This is a partial cross-sectional structural diagram of one embodiment of the present invention.

[0026] Figure label:

[0027] 100. Outer insulating sheath; 110. Fixed end ring; 120. High voltage end connector; 130. Fixed ring; 200. Impregnated paper insulation layer; 300. Mesh fiber reinforcement layer. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0029] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0030] The following is in conjunction with the appendix Figures 1-3 This invention describes a paper-impregnated transformer bushing provided by some embodiments of the present invention.

[0031] This utility model provides a paper-impregnated transformer bushing, including an outer insulating sheath 100, a fixed end ring 110, a high-voltage end connector 120, a fixed ring 130, a paper-impregnated insulation layer 200, and a mesh fiber reinforcement layer 300. The paper-impregnated insulation layer 200 is disposed inside the outer insulating sheath 100 and is covered and fixed with the mesh fiber reinforcement layer 300. The fixed end ring 110 is fixedly connected to the end of the outer insulating sheath 100 and connected to the high-voltage end connector 120 to achieve electrical connection and mechanical fixation. The fixed ring 130 is sleeved on the outside of the fixed end ring 110 to provide additional mechanical support. The high-voltage end connector 120 is electrically connected to the end of the paper-impregnated insulation layer 200 and uses spherical electrodes to optimize the electric field distribution. The mesh fiber reinforcement layer 300 covers the outside of the paper-impregnated insulation layer 200 and is fastened between the fixed end ring 110 and the fixed ring 130 to enhance mechanical strength.

[0032] The impregnated paper insulation layer 200 consists of at least five layers of impregnated paper wrapped together, with a 0.2mm thick high-temperature resistant ceramic microparticle coating sandwiched between each two layers of impregnated paper.

[0033] The outer insulating sheath 100 has a 2mm high spiral raised rib on its surface to increase the creepage distance.

[0034] The mesh fiber reinforcement layer 300 is made of carbon fiber or aramid fiber to improve temperature resistance and mechanical impact resistance, while the outer insulating sheath 100 is made of silicone rubber and epoxy resin composite material to enhance environmental aging resistance.

[0035] The high-voltage connector 120 uses a silver-plated copper busbar with a diameter of 15mm and a spherical electrode with a diameter of 20mm at the high-voltage side end to optimize the electric field distribution and reduce partial discharge.

[0036] Among them, the fixed end ring 110 and the fixed ring 130 are made of glass fiber reinforced composite material, and a 2mm thick flexible silicone cushioning pad is provided inside them.

[0037] The fixing ring 130 is fixed to the end of the outer insulating sheath 100 by mechanical fastening and is provided with an arc-shaped transition structure for stress dispersion.

[0038] The sleeve consists of an outer insulating sheath 100 covering a paper-impregnated insulating layer 200, and a mesh fiber reinforcement layer 300 further enhances its structural stability.

[0039] In a preferred embodiment, the impregnated paper insulation layer 200 is wrapped with five layers of impregnated paper, and a high-temperature resistant ceramic microparticle coating with a thickness of 0.2 mm is sandwiched between every two layers of impregnated paper to improve temperature resistance and anti-aging ability.

[0040] The outer insulating sheath 100 is made of weather-resistant silicone rubber and epoxy resin composite material, and its surface is provided with 2mm high spiral raised ribs to increase the creepage distance and improve the anti-pollution flashover capability.

[0041] The mesh fiber reinforcement layer 300 is made of high-strength carbon fiber or aramid fiber, which is wrapped around the outside of the impregnated paper insulation layer 200 and fastened at the end by a fixing end ring 110 and a fixing ring 130, making the whole structure more stable.

[0042] The high-voltage connector 120 uses a 15mm diameter silver-plated copper busbar and a 20mm diameter spherical electrode at the high-voltage side end to make the electric field distribution more uniform, reduce partial discharge, and improve withstand voltage.

[0043] Both the fixed end ring 110 and the fixed ring 130 are made of glass fiber reinforced composite material and have a 2mm thick flexible silicone buffer layer embedded inside to adapt to stress changes caused by temperature changes and improve mechanical stability.

[0044] During the assembly process, the adhesive-impregnated paper insulation layer 200 is first wrapped around the high-voltage end connector 120, and the mesh fiber reinforcement layer 300 is fixed on the outside; then the whole thing is installed into the outer insulation sheath 100, and the fixing end ring 110 and fixing ring 130 are installed at both ends respectively, and fixed by mechanical fastening.

[0045] In summary, this utility model improves the electrical performance, mechanical strength and service life of the bushing by optimizing the structure of the adhesive-impregnated paper insulation layer 200, the outer insulating sheath 100, the mesh fiber reinforcement layer 300 and the high-voltage end connector 120, and is suitable for insulation protection of various high-voltage transformers.

[0046] The working principle of this utility model:

[0047] Current enters the transformer through the high-voltage connector 120. The high-voltage connector 120 employs a silver-plated copper busbar structure, effectively reducing contact resistance. It also features spherical electrodes at the ends to ensure uniform electric field distribution, reduce partial discharge, and improve the bushing's withstand voltage performance. A paper-impregnated insulation layer 200 covers the interior of the outer insulating sheath 100 and is combined with the mesh fiber reinforcement layer 300 to form a stable insulation system. The paper-impregnated insulation layer 200 uses a multi-layer wrapping structure with high-temperature resistant ceramic microparticle coatings sandwiched between layers to improve insulation performance and heat resistance, ensuring stable transmission of high-voltage current within the bushing without breakdown. The outer insulating sheath 100 is made of weather-resistant silicone rubber and epoxy resin composite material, with spiral raised ribs on its surface to increase creepage distance, enhance anti-flashover capability, and improve the bushing's operational reliability in harsh environments. The mesh fiber reinforcement layer 300 covers the outside of the impregnated paper insulation layer 200. It is made of high-strength carbon fiber or aramid fiber material, which improves the mechanical strength of the overall structure, enhances the impact resistance, and prevents deformation or damage due to external stress during operation.

[0048] In the fixed section, the fixed end ring 110 and the fixed ring 130 are made of glass fiber reinforced composite material, with a flexible silicone buffer layer embedded inside. This allows the entire structure to adapt to stress changes caused by temperature variations, improving the stability of the bushing. Through the above structural optimization, this paper-impregnated transformer bushing ensures the safe transmission of high-voltage current and provides excellent insulation and mechanical protection, thereby improving the transformer's service life and safety.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A paper-impregnated transformer bushing, characterized in that, The device includes an outer insulating sheath (100), a fixed end ring (110), a high-voltage end connector (120), a fixed ring (130), a paper-impregnated insulation layer (200), and a fiber mesh reinforcement layer (300). The paper-impregnated insulation layer (200) is disposed inside the outer insulating sheath (100) and is covered and fixed to the fiber mesh reinforcement layer (300). The fixed end ring (110) is fixedly connected to the end of the outer insulating sheath (100) and is connected to the high-voltage end connector (120). The components are connected to achieve electrical connection and mechanical fixation; the fixing ring (130) is sleeved outside the fixing end ring (110) to provide additional mechanical support; the high-voltage end connector (120) is electrically connected to the end of the impregnated paper insulation layer (200) and uses spherical electrodes to optimize the electric field distribution; the mesh fiber reinforcement layer (300) covers the outside of the impregnated paper insulation layer (200) and is fastened between the fixing end ring (110) and the fixing ring (130) to enhance mechanical strength.

2. The paper-impregnated transformer bushing according to claim 1, characterized in that, The impregnated paper insulation layer (200) consists of at least five layers of impregnated paper wrapped together, with a 0.2 mm thick high-temperature resistant ceramic microparticle coating sandwiched between each two layers of impregnated paper.

3. The paper-impregnated transformer bushing according to claim 1, characterized in that, The surface of the outer insulating sheath (100) is provided with a 2mm high spiral raised rib to increase the creepage distance.

4. The paper-impregnated transformer bushing according to claim 1, characterized in that, The mesh fiber reinforcement layer (300) is made of carbon fiber or aramid fiber material to improve temperature resistance and mechanical impact resistance. The outer insulating sheath (100) is made of silicone rubber and epoxy resin composite material to enhance environmental aging resistance.

5. The paper-impregnated transformer bushing according to claim 1, characterized in that, The high-voltage connector (120) uses a silver-plated copper busbar with a diameter of 15mm and a spherical electrode with a diameter of 20mm at the high-voltage side end to optimize the electric field distribution and reduce partial discharge.

6. The paper-impregnated transformer bushing according to claim 1, characterized in that, The fixed end ring (110) and the fixed ring (130) are made of glass fiber reinforced composite material and have a 2mm thick flexible silicone cushioning pad inside.

7. The paper-impregnated transformer bushing according to claim 1, characterized in that, The fixing ring (130) is fixed to the end of the outer insulating sheath (100) by mechanical fastening and is provided with an arc-shaped transition structure for stress dispersion.

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