Transformer lightning arrester
By tilting the large umbrella skirt and adding a small umbrella skirt, the problem of water column formation in the transformer lightning protection device during windy and rainy weather was solved, ensuring insulation performance, preventing current leakage, and ensuring the normal operation of the transformer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-06
AI Technical Summary
In windy and rainy weather, existing transformer lightning protection devices are susceptible to water damage from rainwater forming columns, which can impair insulation performance, leading to current leakage or short circuits and affecting the normal operation of the transformer.
The large umbrella skirts are tilted, and the tilting directions of adjacent large umbrella skirts are different, so that the lowest drop point is on the conical spiral line. The diameter is gradually reduced to increase the creepage distance, and small umbrella skirts are set between adjacent large umbrella skirts to prevent water column formation.
It effectively guides rainwater, reduces water column formation, ensures insulation performance, prevents current leakage, and ensures normal operation of the transformer.
Smart Images
Figure CN223977785U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of surge arrester technology, specifically relating to a transformer surge arrester device. Background Technology
[0002] A surge arrester connects the power line to the ground. During severe weather, it conducts lightning to the ground, preventing overcurrent damage to electrical equipment. Common surge arresters are metal oxide surge arresters, which mainly consist of a core made of insulating material such as zinc oxide. The core has a first terminal and a second terminal at its two ends. An insulating sleeve, also made of insulating material such as rubber, is fitted around the core. The outer circumference of the insulating sleeve has multiple large and small skirts integrally formed. In use, a 10 kV power line is connected to the first terminal of the surge arrester via a lead wire, and then the surge arrester... Installed on a crossarm, it is usually used with three surge arresters connected in series. The second terminals of the three surge arresters are connected together by a connecting wire. Then, the lower terminal of the outermost surge arrester is led down and connected to the grounding flat iron below. The grounding flat iron is then connected to the grounding electrode exposed on the ground to achieve grounding of the surge arrester. Under normal circumstances, the resistance of the surge arrester is very high, and the voltage cannot pass through, so it is almost in a de-energized state. When the transformer is struck by lightning, the resistance of the surge arrester will decrease and the voltage will increase, safely introducing the lightning current into the ground through the core, connecting wire, grounding flat iron and grounding electrode.
[0003] In existing technologies, the large umbrella skirts are arranged in a parallel array at equal intervals along the axis of the core. In order to increase the surface area of the surge arrester, the distance between two adjacent large umbrella skirts is generally set to be relatively short. On rainy days, rainwater falls on the uppermost large umbrella skirt and flows down to the lower umbrella skirts, which can easily form water columns. Water columns may damage the insulation performance of the insulating sleeve, leading to current leakage or short circuit, making the surge arrester conductive, thereby increasing the transformer loss and affecting the normal use of the transformer. Utility Model Content
[0004] To address the above problems, the purpose of this utility model is to provide a transformer lightning protection device that solves the problems mentioned in the background art.
[0005] This utility model provides a transformer lightning protection device, including an insulating sleeve with a core installed inside. The two ends of the core are respectively equipped with a first terminal and a second terminal, and the first terminal and the second terminal extend out of the outside of the insulating sleeve. The outer circumference of the insulating sleeve is integrally formed with a plurality of large umbrella skirts. The plurality of large umbrella skirts are inclinedly formed on the insulating sleeve at intervals from the first terminal to the second terminal, and the inclination direction of two adjacent large umbrella skirts is different.
[0006] Preferably, the diameter of the plurality of large umbrella skirts gradually decreases from the first terminal to the second terminal.
[0007] Preferably, the multiple inclined umbrella skirts each have a lowest water drop point, and the lowest water drop points of the multiple umbrella skirts are on a conical spiral line.
[0008] Preferably, the angle between the projection line of the connection line between the lowest water-falling point of two adjacent large umbrella skirts and the axis of the core on the horizontal plane is 90 degrees.
[0009] Preferably, a small umbrella skirt is also provided on the outer wall of the insulating sleeve, and the small umbrella skirt is located between two adjacent large umbrella skirts.
[0010] Preferably, there are multiple smaller umbrella skirts between two adjacent large umbrella skirts, and the multiple smaller umbrella skirts are arranged at equal intervals.
[0011] Preferably, the diameter of the small umbrella skirt is not greater than the diameter of the two adjacent large umbrella skirts.
[0012] The beneficial effects of this utility model are: by setting the large umbrella skirt at an angle and setting the angles of two adjacent large umbrella skirts at different angles, rainwater can be guided and is not affected by wind to a certain extent. This makes the rainwater on the two adjacent large umbrella skirts fall in different directions, reducing the probability of water column formation and thus ensuring the normal operation of the transformer. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural diagram of the prior art of this utility model;
[0014] Figure 2 This is a front view of the prior art of this utility model;
[0015] Figure 3 This is a front view of the prior art of this utility model;
[0016] Figure 4 This is a schematic diagram of the prior art of this utility model in use.
[0017] Figure 5 This is a three-dimensional structural diagram of the present invention;
[0018] Figure 6 This is a cross-sectional structural diagram of the present invention;
[0019] Figure 7 This is a front view schematic diagram of the present invention;
[0020] Figure 8 This is a front view of the present invention.
[0021] In the diagram: 1. Core; 2. Insulating sleeve; 3. First terminal; 4. Second terminal; 5. Large umbrella skirt; 501. Lowest water drop point; 6. Small umbrella skirt; 7. Water column; 701. Water droplet; 8. Surge arrester; 9. Crossarm; 10. Connecting wire; 11. Lead wire; 12. Grounding flat iron; 13. Grounding electrode. Detailed Implementation
[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.
[0023] like Figure 1-4 As shown, this utility model describes a conventional transformer surge arrester, which mainly includes a core 1. The core 1 is made of a material with nonlinear resistance, such as zinc oxide. The working principle of the zinc oxide surge arrester relies on the nonlinear volt-ampere characteristics of the zinc oxide varistor. Under normal operating voltage, the zinc oxide varistor exhibits a high resistance state, equivalent to an insulating state. At this time, the current flowing through the surge arrester is extremely small, only in the microamp or milliamp range. However, when an overvoltage (lightning strike) occurs, the resistance of the zinc oxide varistor drops sharply, exhibiting a low resistance state, equivalent to a short circuit, thereby allowing a large current to flow, dissipating the energy of the overvoltage, and achieving a protective effect. The core 1 has a first terminal 3 and a second terminal 4 at its two ends. An insulating sleeve 2 is fitted around the outer periphery of the core 1. The insulating sleeve 2 is made of an insulating material, such as rubber. Multiple large skirts 5 and small skirts 6 are integrally formed around the outer periphery of the insulating sleeve 2. Generally, the large skirts 5 are arranged in a parallel array at equal intervals along the axial direction of the core 1. In use, as... Figure 4 As shown, a 10 kV power line is connected to the first terminal 3 of the surge arrester 8 via lead wire 11. The surge arrester 8 is then installed on the crossarm 9. Typically, three surge arresters 8 are connected in parallel. The second terminals 4 of the three surge arresters 8 are connected together via a connecting wire 10. Then, the lower terminal of the outermost surge arrester 8 is connected downwards via lead wire 11 to the grounding flat iron 12 below. The grounding flat iron 12 is then connected downwards to the grounding electrode 13 exposed on the ground to achieve grounding of the surge arrester 8. Under normal circumstances, the resistance of the surge arrester 8 is very high, and the voltage cannot pass through, so it is almost in a de-energized state. When the transformer is struck by lightning, the resistance of the surge arrester 8 will decrease, and the voltage will increase, safely introducing the lightning current to the ground through the core 1, connecting wire 10, grounding flat iron 12, and grounding electrode 13. The above is an introduction to an existing transformer surge protection device.
[0024] In existing technologies, the large umbrella skirts 5 are arranged in a parallel array at equal intervals along the axis of the core 1. To increase the creepage distance of the surge arrester 8, the distance between two adjacent large umbrella skirts 5 is generally set relatively short. During windy and rainy days, rainwater falls on the uppermost large umbrella skirt 5. Under the combined action of wind and gravity, the rainwater concentrates and flows down to the side of the lower umbrella skirt 5, easily forming a water column 7. Although pure water is theoretically non-conductive, water in nature usually contains various impurities, such as dissolved minerals and salts. These impurities give rainwater a certain degree of conductivity, especially during lightning activity, when rainwater may contain more charged particles, thus... To enhance its conductivity, the water column 7 may damage the insulation performance of the insulating sleeve 2, leading to current leakage or short circuit, making the surge arrester 8 conductive, thereby increasing the transformer loss and affecting the normal use of the transformer. As can be seen from the above, the existing transformer surge arrester has the following defects when in use: to ensure that the surge arrester 8 has sufficient creepage distance, a large number of large umbrella skirts 5 need to be set. However, when a large number of large umbrella skirts 5 are distributed on the insulating sleeve 2, the distance between them is small. When encountering windy and rainy weather, the rainwater on the large umbrella skirts 5 is affected by the wind and concentrated and drained to one side of the large umbrella skirts 5. If the distance between adjacent large umbrella skirts 5 is short, water column 7 is easily formed.
[0025] Based on the above problems, this utility model adopts the following improvement method to solve them, such as... Figure 5-8 As shown, a transformer lightning arrester differs from existing technologies in the installation angle of the large umbrella skirt 5. In this invention, multiple large umbrella skirts 5 are inclinedly arranged on the insulating sleeve 2 at intervals from the first terminal 3 to the second terminal 4. Each large umbrella skirt 5 forms a lowest water drop point 501, which guides the rainwater falling on the large umbrella skirt 5 and is to a certain extent unaffected by wind. This allows the rainwater to fall along the lowest water drop point 501 under the action of gravity. To avoid the formation of water columns 7, the inclination directions of two adjacent large umbrella skirts 5 are set differently, so that the water drop points of two adjacent large umbrella skirts 5 are not on the same straight line. This can prevent the lightning arrester 8 from conducting electricity and affecting the normal use of the transformer.
[0026] Furthermore, such as Figures 5-8 As shown, based on the above, the diameter of the multiple large umbrella skirts 5 gradually decreases from the first terminal 3 to the second terminal 4. Even if two large umbrella skirts 5 have the same lowest water drop point 501, the rainwater falling from these two lowest water drop points 501 is not on the same straight line. Thus, the lowest water drop points 501 of each large umbrella skirt 5 are not on the same straight line. When rainwater falls on a large umbrella skirt 5, to a certain extent, the rainwater slides directly downwards and does not form a water column 7 with the rainwater on the large umbrella skirt 5 below, further reducing the probability of water column 7 forming.
[0027] Furthermore, such as Figure 8As shown, the lines connecting the lowest landing points 501 of multiple large umbrella skirts 5 are set on the same conical spiral line. Within a certain range, the lowest landing points 501 of multiple adjacent large umbrella skirts 5 are not in the same direction (the number of large umbrella skirts 5 can be determined according to factors such as the distance between two adjacent large umbrella skirts 5 or the length of the core 1). Figure 8 As shown, the angle between the projection line of the connecting line 10 connecting the lowest water drop point 501 of two adjacent large umbrella skirts 5 and the axis of the core 1 on the horizontal plane is 90 degrees. At this time, the four large umbrella skirts 5 form a cycle. The lowest water drop point 501 of the four adjacent large umbrella skirts 5 from the first terminal 3 downwards is located on the left, front, right and rear sides of the core 1 respectively. The water drop points of the four large umbrella skirts 5 are not on the same vertical line. After the multiple lowest water drop points 501 are connected by a smooth line, their projection in the horizontal direction is a counterclockwise vortex line, thus effectively avoiding water... The formation of column 7 can be achieved by the following: the angle between the projection line of the line connecting the lowest water drop point 501 of two adjacent large umbrella skirts 5 and the axis of the core 1 on the horizontal plane can be 60 degrees, in which case the six large umbrella skirts 5 form a cycle. Alternatively, the angle can be 45 degrees, 30 degrees, etc., and so on. Of course, the angle between the projection line of the line connecting the lowest water drop point 501 of two adjacent large umbrella skirts 5 and the axis of the core 1 on the horizontal plane should be set according to the length of the core 1, as long as the lowest water drop point 501 of two adjacent large umbrella skirts 5 is not on the same straight line.
[0028] Furthermore, such as Figure 3 and Figure 8 As shown, to increase the creepage distance of the surge arrester 8, a small umbrella skirt 6 is also provided between two adjacent large umbrella skirts 5. The material of the small umbrella skirt 6 is the same as that of the large umbrella skirt 5, which can be rubber. Depending on the distance between two adjacent large umbrella skirts 5, the number of small umbrella skirts 6 can be one or more. When there are multiple small umbrella skirts 6, they are arranged in an equally spaced array between two adjacent large umbrella skirts 5. In order to avoid increasing the probability of water column 7 formation while extending the creepage distance of the surge arrester 8, the diameter of the small umbrella skirt 6 is set to be smaller than the diameter of the large umbrella skirt 5, so that the small umbrella skirt 6 cannot, to a certain extent, catch the rainwater falling from the large umbrella skirt 5 above it. The creepage distance of this utility model is the distance from P3 to P4, that is, the path S, and the distance between two adjacent large umbrella skirts 5 with the same lowest water drop point 501 is H. Figure 3As shown, the creepage distance of the prior art is the distance from P1 to P2, that is, path S1. Path S > path S1, and the distance between the lowest water dropping points 501 of two adjacent large umbrella skirts 5 is H1, H1 < H. When rainwater flows between two large umbrella skirts 5 with a distance of H, the rainwater drops in the shape of water droplets 701. When flowing between two large umbrella skirts 5 with a distance of H1, due to the shorter distance, the rainwater easily forms a water column 7. To sum up, compared with the prior art, the utility model not only significantly increases the surface area of the arrester 8 and extends the path length of current leakage on the surface of the arrester 8, but also can avoid the formation of the water column 7.
[0029] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent in such process, method, article or device. Specific examples are used in this article to elaborate on the principle and implementation mode of the utility model. The description of the above examples is only used to help understand the method and its core idea of the utility model. The above is only the preferred implementation mode of the utility model. It should be pointed out that due to the limitation of literal expression, there are objectively infinite specific structures. For those of ordinary skill in the art, without departing from the principle of the utility model, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate way; These improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall all be regarded as the protection scope of the utility model.
Claims
1. A lightning protection device for a transformer, comprising an insulating sleeve (2) in which a core (1) is mounted, two ends of the core (1) being respectively provided with a first terminal (3) and a second terminal (4), the first terminal (3) and the second terminal (4) extending out of the insulating sleeve (2), and a plurality of large umbrella skirts (5) being integrally formed on the outer periphery of the insulating sleeve (2), characterized in that: A plurality of said large umbrella skirts (5) are obliquely formed on the insulating sleeve (2) from the direction of the first connecting end (3) to the second connecting end (4), and the oblique directions of two adjacent large umbrella skirts (5) are different.
2. A transformer lightning arrester according to claim 1, characterized in that The diameters of a plurality of said large umbrella skirts (5) gradually decrease from the direction of the first connecting end (3) to the second connecting end (4).
3. A transformer lightning protection device according to claim 1, characterized in that: Each of a plurality of said obliquely formed large umbrella skirts (5) has a lowest water falling point (501), and the lowest water falling points (501) of a plurality of large umbrella skirts (5) are on a same conical spiral line.
4. A transformer lightning arrester according to claim 3, characterised in that: The included angle between the lowest water falling points (501) of two adjacent large umbrella skirts (5) and the projection line of the connecting line (10) of the axis of the core (1) on the horizontal plane is 90 degrees.
5. A transformer lightning protection device according to claim 1, characterized in that: The outer wall of the insulating sleeve (2) is further provided with a small umbrella skirt (6), and the small umbrella skirt (6) is between two adjacent large umbrella skirts (5).
6. A transformer lightning arrester according to claim 5, characterised in that: There are a plurality of small umbrella skirts (6) between two adjacent large umbrella skirts (5), and a plurality of said small umbrella skirts (6) are equidistantly arrayed.
7. A lightning protection device for a transformer according to claim 5 or 6, characterized in that: The diameter of the small umbrella skirt (6) is not greater than the diameter of two adjacent large umbrella skirts (5).