A 220kV guide rod type bushing oil equalizing ball protection structure and oil immersed transformer

Abstract

The utility model discloses a 220kV guide pole formula bushing oil equalizing ball protection structure and oil -immersed transformer belongs to transformer equipment technical field, including insulating piece, insulating fastener and insulating pad, the thickness of insulating piece is 4 8mm, and guide pole formula bushing equalizing ball is installed at the terminal of transformer high tension lead, and insulating piece reverse buckle cover is equipped with the outside of guide pole formula bushing equalizing ball, and insulating pad is fixed on transformer high tension lead through insulating fastener, and insulating pad supports insulating piece. The utility model solves technical problem such as difficult manual wrapping insulating crepe paper, high process requirement and paper pulp mode cost, long period, secondary processing difficulty etc.

Description

Technical Field

[0001] This utility model relates to the field of transformer equipment technology, and in particular to a 220kV guide rod type bushing oil equalization ball protection structure and an oil-immersed transformer. Background Technology

[0002] For 220kV transformers, the high electric field strength between the equalizing sphere and the riser wall in the bushing oil makes discharge easy, especially when using rod-type bushings, making protection of the equalizing sphere more difficult. Currently, there are two main methods commonly used. Method 1 (see attached...) Figure 3 Method 1: Wrap insulating crepe paper around the equalizing sphere; Method 2 (as shown in the attached diagram) Figure 4 The first method involves coating the outside of the equalizing sphere with paper pulp. While both methods offer some protection to the equalizing sphere, they also have drawbacks. Method one, due to the use of multiple layers of crepe paper wrapping, is a purely manual operation, making it difficult and requiring a high level of skill in both the wrapping process and the operator. The thickness and uniformity of the wrapping paper significantly impact the protective effect. Method two, using a paper pulp coating process, typically involves sending the equalizing sphere to a specialized manufacturer for processing after production, resulting in high costs and a long processing time. Furthermore, the paper pulp adheres to the equalizing sphere, making secondary repairs extremely difficult should any thread breakage or quality issues arise. Utility Model Content

[0003] The main purpose of this utility model is to provide a 220kV conductor rod type bushing oil equalization ball protection structure, which solves the technical problems of high difficulty and high process requirements of manually wrapping insulating crepe paper, as well as high cost, long cycle and difficulty of secondary processing of paper pulp hanging method, and improves the insulation margin of bushing equalization ball and product safety and reliability.

[0004] To achieve the above objectives, this utility model proposes a 220kV guide rod bushing oil equalization ball protection structure, comprising an insulating component, insulating fasteners, and insulating pads; the thickness of the insulating component is 4-8mm, the guide rod bushing equalization ball is installed at the terminal of the transformer high-voltage lead, the insulating component is invertedly covered on the outside of the guide rod bushing equalization ball, and the insulating pads are fixed to the transformer high-voltage lead by the insulating fasteners, and the insulating pads support the insulating component.

[0005] Optionally, the sidewall of the insulating component is provided with a receiving groove, and the receiving groove is filled with an insulating medium. Furthermore, by providing a receiving groove on the sidewall of the insulating component and filling it with an insulating medium, the insulation performance of the protective structure can be further improved, while the buffering effect of the insulating medium can reduce the impact of oil flow on the insulating component and the equalizing ball.

[0006] Optionally, the sidewall of the insulating component is provided with a boss, and the boss has an injection hole that communicates with the receiving groove for injecting insulating medium. Furthermore, the boss and injection hole facilitate the injection of insulating medium into the receiving groove during installation, and also facilitate the subsequent replenishment or replacement of the insulating medium as needed, improving maintenance convenience.

[0007] Optionally, a cap is provided on the protrusion, and the cap is detachably installed in the injection hole. Furthermore, the cap effectively prevents impurities in the transformer oil from entering the receiving tank and contaminating the insulating medium, ensuring the insulating performance of the insulating medium, and preventing leakage of the insulating medium.

[0008] Optionally, the insulating medium is an insulating liquid, specifically transformer oil. Furthermore, using transformer oil as the insulating medium is advantageous because it matches the internal insulation environment of the transformer and does not affect the overall performance of the transformer oil. Additionally, transformer oil possesses excellent insulation and heat dissipation properties, which can enhance the insulation effect of the protective structure while also aiding in heat dissipation from the equalizing sphere.

[0009] Optionally, the insulating fastener is an insulating bolt, which is a nylon bolt. Furthermore, nylon bolts possess excellent insulation, oil resistance, and aging resistance, enabling them to adapt to the oil-immersed environment inside the transformer. They are also lightweight, easy to install, and do not impose additional load on the high-voltage leads.

[0010] Optionally, the insulation component has a thickness of 6 mm. Furthermore, when the insulation component is 6 mm thick, it can minimize the impact on the heat dissipation performance of the equalizing ball while ensuring protective strength and insulation performance, achieving the best balance between protective and heat dissipation effects.

[0011] This application also proposes an oil-immersed transformer having the 220kV conductor rod type bushing oil-immersed equalizing ball protection structure as described above.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This utility model presents a 220kV guide rod bushing oil-equalizing ball protection structure, comprising an insulating component, insulating fasteners, and insulating pads. The insulating component has a thickness of 4-8mm. The guide rod bushing equalizing ball is installed at the terminal of the transformer's high-voltage lead. The insulating component is invertedly covered on the outside of the guide rod bushing equalizing ball. The insulating pads are fixed to the transformer's high-voltage lead by the insulating fasteners and support the insulating component. Compared with the solution using insulating crepe paper wrapping, this utility model uses molded insulating components, which have reliable processing technology, stable product performance, good consistency, low operator skill requirements, simple installation, and improved efficiency. Compared with the solution using paper pulp, the molded insulating components and insulating pads of this utility model can be mass-produced, reducing production costs. Furthermore, because the molded insulating components and pads are easy to assemble and disassemble, replacement is very convenient in case of damage or quality problems. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of an embodiment of the 220kV guide rod type bushing oil equalization ball protection structure of this utility model; Figure 2 This is a schematic diagram of the insulating component. Figure 3 A schematic diagram showing the wrapping of insulating crepe paper around the outside of the equalizing sphere; Figure 4 This is a schematic diagram of paper pulp being coated on the outside of an equalizing sphere.

[0015] Explanation of icon numbers: The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0019] This utility model proposes a 220kV guide rod type bushing oil pressure equalization ball protection structure.

[0020] Please see Figures 1-2 In one embodiment of this utility model, the 220kV guide rod bushing oil equalization ball protection structure includes an insulating component 2, an insulating fastener 3, and an insulating pad 4; the thickness of the insulating component 2 is 4-8mm, the guide rod bushing equalization ball 1 is installed at the terminal of the transformer high-voltage lead, the insulating component 2 is invertedly covered on the outside of the guide rod bushing equalization ball 1, and the insulating pad 4 is fixed to the transformer high-voltage lead by the insulating fastener 3, and the insulating pad 4 supports the insulating component 2.

[0021] In this embodiment, the insulating component 2 is made of high-strength epoxy resin material and is formed by vacuum casting and high-temperature curing process. The thickness of the insulating component 2 is 6mm. The thickness of 6mm meets the insulation strength requirements under the 220kV voltage level. When the thickness of the insulating component 2 is 6mm, it can minimize the impact on the heat dissipation performance of the equalizing ball while ensuring the protection strength and insulation performance, and achieve the best balance between protection effect and heat dissipation effect.

[0022] The insulating fastener 3 is an insulating bolt, which is a nylon bolt. Furthermore, nylon bolts have excellent insulation, oil resistance, and aging resistance, enabling them to adapt to the oil-immersed environment inside the transformer. They are also lightweight, easy to install, and do not impose additional load on the high-voltage leads.

[0023] The insulating pad 4 is molded from polytetrafluoroethylene (PTFE) and has a 30mm×20mm×15mm rectangular structure. It features symmetrically distributed 8.2mm diameter mounting holes at both ends, with hole diameter tolerance controlled at H7 level to ensure a smooth transition fit with M8 nylon bolts. Countersunk holes of 12mm diameter and 1mm depth are added around the mounting holes to accommodate the nylon gasket, ensuring a smooth surface after assembly, preventing stress concentration, and improving overall insulation performance.

[0024] In one embodiment of the present invention, the side wall of the insulating component 2 is provided with a receiving groove 201, and the receiving groove 201 is filled with an insulating medium 5; the side wall of the insulating component 2 is provided with a boss 202, and the boss 202 is provided with an injection hole 203, which is connected to the receiving groove 201 and is used to inject the insulating medium 5.

[0025] In this embodiment, the insulating medium 5 is an insulating liquid, which is transformer oil. Using transformer oil as the insulating medium is beneficial because it matches the internal insulation environment of the transformer and will not affect the overall performance of the transformer oil. Furthermore, transformer oil has good insulation and heat dissipation properties, which can improve the insulation effect of the protective structure while assisting the equalizing ball in heat dissipation.

[0026] By providing a receiving groove 201 on the side wall of the insulating component 2 and filling it with insulating medium 5, the insulation performance of the protective structure can be further improved. At the same time, the buffering effect of the insulating medium can be used to reduce the impact of oil flow on the insulating component and the equalizing ball.

[0027] The protrusion 202 and the injection hole 203 facilitate the injection of insulating medium 5 into the receiving groove 201 during installation, and also facilitate the subsequent replenishment or replacement of insulating medium 5 as needed, thus improving maintenance convenience.

[0028] Furthermore, a cap 204 is provided on the boss 202. The cap 204 is detachably installed in the injection hole 203. The cap 204 can effectively prevent impurities in the transformer oil from entering the receiving tank 201 and contaminating the insulating medium 5, ensuring the insulating performance of the insulating medium 5, and preventing leakage of the insulating medium 5.

[0029] This application also proposes an oil-immersed transformer having the 220kV conductor rod type bushing oil-immersed equalizing ball protection structure as described above.

[0030] Installation steps: Place the two insulating pads 4 on both sides of the transformer high-voltage lead, aligning the mounting holes of the insulating pads 4 with the preset mounting positions on the high-voltage lead. Then, pass the insulating fastener 3 through the mounting holes of the insulating pads 4 and the mounting holes on the high-voltage lead, put on the gasket, and screw on the insulating fastener 3 to firmly fix the insulating pads 4 to the transformer high-voltage lead.

[0031] Then, the insulating component 2 is inverted and placed over the outside of the guide rod type bushing equalizing ball 1, so that the bottom of the insulating component 2 contacts the top of the two insulating pads 4. The insulating pads 4 support and position the insulating component 2, ensuring that the insulating component 2 completely covers the equalizing ball 1 and does not collide with the equalizing ball 1 or other components. The cap 204 on the boss 202 of the insulating component 2 is opened, and the insulating medium 5, i.e., transformer oil, is injected into the receiving groove 201 through the injection hole 203 until the receiving groove 201 is full of transformer oil. Then, the cap 204 is screwed on to complete the filling of the insulating medium 5.

[0032] After installation, check the installation position of the insulating component 2 through the transformer's observation window or maintenance port to see if it is accurate and if there is any looseness or tilting; check if the cap 204 is securely installed and if there is any transformer oil leakage; at the same time, use an insulation resistance tester to test the insulation performance of the protective structure to ensure that its insulation resistance meets the relevant standard requirements.

[0033] During the regular maintenance of the transformer, the protective structure is inspected. The cap 204 is opened, and the quantity of the insulating medium 5, i.e., transformer oil, in the receiving tank 201 is checked. If insufficient, it is replenished promptly. The color and transparency of the transformer oil are checked; if oil deterioration is found, the transformer oil in the receiving tank 201 is replaced. The insulating components 2, the insulating pads 4, and the insulating fasteners 3 are checked for aging, damage, etc.; if any problems are found, they are replaced promptly. The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A 220kV conductor rod type bushing oil equalizing ball protection structure, characterized in that, It includes an insulating component, insulating fasteners, and insulating pads; the insulating component has a thickness of 4-8mm, the guide rod type bushing equalizing ball is installed at the terminal of the transformer high-voltage lead, the insulating component is invertedly covered on the outside of the guide rod type bushing equalizing ball, and the insulating pads are fixed to the transformer high-voltage lead by the insulating fasteners, and the insulating pads support the insulating component.

2. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 1, characterized in that: The side wall of the insulating component is provided with a receiving groove, and the receiving groove is filled with an insulating medium.

3. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 2, characterized in that: The side wall of the insulating component is provided with a boss, and the boss is provided with an injection hole. The injection hole is connected to the receiving groove and is used to inject the insulating medium.

4. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 3, characterized in that: A cap is provided on the protrusion, and the cap is detachably installed in the injection hole.

5. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 2, characterized in that: The insulating medium is an insulating liquid, and the insulating liquid is transformer oil.

6. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 1, characterized in that: The insulating fastener is an insulating bolt, and the insulating bolt is a nylon bolt.

7. The 220kV guide rod type bushing oil equalizing ball protection structure as described in claim 6, characterized in that: The insulation component has a thickness of 6 mm.

8. An oil-immersed transformer, characterized in that, It has a 220kV guide rod type bushing oil equalization ball protection structure as described in any one of claims 1-7.

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