CN222927312U - Oil immersed transformer with overvoltage protection structure - Google Patents
Oil immersed transformer with overvoltage protection structure Download PDFInfo
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- CN222927312U CN222927312U CN202421955133.XU CN202421955133U CN222927312U CN 222927312 U CN222927312 U CN 222927312U CN 202421955133 U CN202421955133 U CN 202421955133U CN 222927312 U CN222927312 U CN 222927312U
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Abstract
本实用新型公开了一种具有过电压保护结构的油浸式变压器，其技术方案要点是包括变压器箱体和多个定位于变压器箱体上表面上且内置高压端子的瓷瓶，多个瓷瓶的顶端均设置有高压铜盖和连接于高压铜盖一侧的第一避雷针，多个第一避雷针的长度方向均平行于变压器箱体的上表面，变压器箱体上表面上还设置有与多个瓷瓶一一对应的连接架和一端定位于连接架上且位于相应瓷瓶一侧的第二避雷针，多个第二避雷针均垂直于变压器箱体上表面，多个第二避雷针的顶端所在高度低于第一避雷针所在高度，多个第一避雷针未与高压铜盖相连的一端均向下弯折并朝向相应第二避雷针的顶端，解决了现有技术容易过电压而损坏的问题。
The utility model discloses an oil-immersed transformer with an overvoltage protection structure. The technical scheme thereof mainly comprises a transformer box and a plurality of porcelain bottles positioned on the upper surface of the transformer box and having built-in high-voltage terminals. The tops of the plurality of porcelain bottles are all provided with high-voltage copper covers and a first lightning rod connected to one side of the high-voltage copper cover. The length directions of the plurality of first lightning rods are all parallel to the upper surface of the transformer box. A connecting frame corresponding to the plurality of porcelain bottles one by one and a second lightning rod with one end positioned on the connecting frame and located on one side of the corresponding porcelain bottle are also provided on the upper surface of the transformer box. The plurality of second lightning rods are all perpendicular to the upper surface of the transformer box. The height at which the tops of the plurality of second lightning rods are located is lower than the height at which the first lightning rods are located. The ends of the plurality of first lightning rods not connected to the high-voltage copper cover are all bent downward and face the tops of the corresponding second lightning rods, thereby solving the problem that the prior art is easily damaged by overvoltage.
Description
Technical Field
The utility model relates to the technical field of oil-immersed transformers, in particular to an oil-immersed transformer with an overvoltage protection structure.
Background
Electric power is a cornerstone of modern industrial, commercial and residential life, which not only drives machines in operation, supports the infrastructure of information and communication technologies, but also provides lighting and heating for homes. The stable supply of electricity is an important measure of the maturity and industrialization level of a national infrastructure. With the development of the age, the electric power system has just been considered as one of the largest systems in the world, which permeates all sides in the human society. The transformer plays a core role in current conversion and voltage conversion as a core part in the power system, and the operation of the whole system depends on whether the transformer can normally operate.
The existing oil immersed transformer has overvoltage phenomenon, the reasons for the overvoltage phenomenon are divided into external factors and internal factors, the external factors mainly come from lightning impulse, the high-voltage terminal is usually sleeved in the porcelain bottle and fixed above the oil tank, and the terminal contact is exposed to the outside, so that once the high-voltage terminal is subjected to lightning impulse, the high-voltage terminal mainly bears the overvoltage caused by the lightning impulse by means of the tip discharge principle, the internal factors mainly come from damage of certain elements in the power system and instantaneous closing or opening of the elements, so that the overvoltage phenomenon can be caused at the high-voltage terminal, and irreversible damage to the transformer can be caused by the external factors or the internal factors.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model aims to provide an oil immersed transformer which runs stably and has an overvoltage protection structure.
In order to achieve the purpose, the oil immersed transformer with the overvoltage protection structure comprises a transformer box body and a plurality of porcelain bottles which are positioned on the upper surface of the transformer box body and are internally provided with high-voltage terminals, wherein the top ends of the porcelain bottles are respectively provided with a high-voltage copper cover and a first lightning rod connected to one side of the high-voltage copper cover, the length directions of the first lightning rods are parallel to the upper surface of the transformer box body, connecting frames which are in one-to-one correspondence with the porcelain bottles and second lightning rods with one ends positioned on the connecting frames and on one side of the corresponding porcelain bottles are further arranged on the upper surface of the transformer box body, the second lightning rods are perpendicular to the upper surface of the transformer box body, the top ends of the second lightning rods are lower than the first lightning rods, one ends of the first lightning rods which are not connected with the high-voltage copper covers are bent downwards and face the top ends of the corresponding second lightning rods, and electricity is led to the second lightning rods through the first lightning rods, and therefore the voltage of the transformer box body is led to the ground.
As a further improvement of the utility model, the first lightning rod and the second lightning rod which are connected with the same porcelain bottle are all positioned in the same vertical plane.
As a further improvement of the utility model, the connecting frames comprise square pressure plates sleeved outside the bottom ends of the corresponding porcelain bottles and fixedly connected with the transformer box body through bolts and triangular supports with two ends positioned on the square pressure plates and the tips extending to one side of the transformer box body, and the second lightning rods are positioned at the tips of the corresponding triangular supports.
As a further improvement of the utility model, the plurality of connecting frames also comprise a presser foot positioned below the square pressure plate and pressed on the bottom end of the porcelain bottle.
As a further improvement of the utility model, a supporting plate component corresponding to the porcelain bottles one by one and a lightning arrester positioned on the supporting plate component are fixedly connected to one side wall of the transformer box body.
As a further improvement of the utility model, the plurality of support plate assemblies comprise a static plate fixedly connected with the side wall of the transformer box body and a movable plate in sliding connection with the static plate, the plurality of lightning arresters are positioned at one end of the corresponding movable plate, and the distance between the lightning arresters and the corresponding porcelain bottles is changed by moving the movable plate along the length direction of the static plate.
As a further improvement of the utility model, the side wall of the transformer box body is fixedly connected with the radiating fin group, and the radiating fin group positioned below the movable plate can support the movable plate.
As a further improvement of the utility model, the bottom ends of the lightning arresters are fixedly connected with brackets connected with corresponding movable plates, and the brackets are provided with reinforcing ribs which can be in contact with the radiating fin group.
The transformer has the beneficial effects that the first lightning rod guides electricity to the second lightning rod to lead redundant voltage to the ground through the transformer box body, so that the defect that the transformer is damaged due to overvoltage phenomenon caused by external factors or internal factors of the high-voltage terminal can be overcome, under the condition of overvoltage, a passage is formed between the first lightning rod and the second lightning rod, the redundant voltage is guided away in time, the transformer system can be quickly recovered to be normal and a protection effect is provided, and under the condition of normal voltage, an open circuit is formed between the first lightning rod and the second lightning rod, so that the voltage at the high-voltage terminal is ensured to be stable and in a normal running state.
Drawings
FIG. 1 is a schematic perspective view of the present utility model;
Fig. 2 is an enlarged view at a in fig. 1.
The transformer comprises the following components of 1, a transformer box body, 11, a radiating fin group, 2, porcelain bottles, 3, a high-voltage copper cover, 4, a first lightning rod, 5, a connecting frame, 51, a square pressure plate, 52, a triangular bracket, 53, a presser foot, 6, a second lightning rod, 7, a supporting plate component, 71, a static plate, 72, a movable plate, 8, a lightning arrester, 9, a bracket, 91 and a reinforcing rib.
Detailed Description
The utility model will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals.
Referring to fig. 1 and 2, an oil immersed transformer with an overvoltage protection structure of the present embodiment includes a transformer case 1 and a plurality of porcelain bottles 2 positioned on an upper surface of the transformer case 1 and having high voltage terminals built therein, wherein the transformer case 1 is made of a metal material and is grounded, and the porcelain bottles 2 are insulators and have the same functions and actions as the existing high voltage bushings;
Based on the prior art, the first lightning rod 4 is bent, the second lightning rod 6 is straight, a connecting frame 5 is fixedly connected to the upper surface of the transformer box body 1, then one end of the second lightning rod 6 is inserted into the connecting frame 5 and is perpendicular to the upper surface of the transformer box body 1, the second lightning rod 6 is positioned on one side of the porcelain insulator 2, the height of the top end of the second lightning rod 6 relative to the upper surface of the transformer box body 1 is smaller than the height of the top end of the porcelain insulator 2 relative to the upper surface of the transformer box body 1, one end of the first lightning rod 4 can be positioned on the side wall of the high-voltage copper cover 3 in a threaded connection or welding mode, the part, connected with the high-voltage copper cover 3, of the first lightning rod 4 extends along the radial direction of the high-voltage copper cover 3, then the high-voltage copper cover 3 is positioned at the top end of the porcelain insulator 2 and is electrically connected with the part, exposed out of the high-voltage terminal, one end of the first lightning rod 4, which is far from the high-voltage copper cover 3, is inclined downwards relative to the horizontal plane and faces the top end of the second lightning rod 6, the connecting frame 5 is made of a conductive material and can be fixedly connected with the transformer box body 1 through a bolt;
When overvoltage occurs due to lightning impulse or voltage fluctuation of a power system, the voltage at the end part of the high-voltage terminal is rapidly increased, the voltage is guided to the first lightning rod 4 through the high-voltage copper cover 3, a large voltage difference exists between the first lightning rod 4 and the second lightning rod 6, the second lightning rod 6 breaks down due to the point discharge principle, so that a passage is formed, the voltage on the first lightning rod 4 is guided to the ground through the second lightning rod 6, the connecting frame 5 and the transformer box body 1 in sequence, after the voltage is stabilized, the broken air between the first lightning rod 4 and the second lightning rod 6 is rapidly recovered, so that the first lightning rod 4 and the second lightning rod 6 are in a broken state, and the whole transformer system is recovered to a normal working state;
The design can make up the defect that the transformer is damaged due to the overvoltage phenomenon caused by the external factor or the internal factor of the high-voltage terminal, under the condition of overvoltage, a passage is formed between the first lightning rod 4 and the second lightning rod 6, the redundant voltage is conducted away in time, the transformer system is facilitated to quickly recover to be normal and provide a protection effect, under the condition of normal voltage, an open circuit is formed between the first lightning rod 4 and the second lightning rod 6, and therefore, the voltage at the high-voltage terminal is ensured to be stable and in a normal running state.
As a concrete implementation mode of improvement, referring to FIG. 2, the first lightning rod 4 and the second lightning rod 6 connected with the same porcelain bottle 2 are all in the same vertical plane, so that compared with the design that the first lightning rod 4 and the second lightning rod 6 are arranged in different vertical planes, the straight line distance between the two ends of the first lightning rod 4 and the second lightning rod 6 can be effectively shortened, the air between the two ends of the first lightning rod 4 and the second lightning rod 6 can be broken down quickly, the efficiency of conducting away redundant voltage is improved, and the transformer is protected timely.
As a specific embodiment of improvement, referring to fig. 2, a plurality of connecting frames 5 include a square pressure plate 51 and an a-frame 52, the square pressure plate 51 is a ring body with a square outline and an inner cavity through which the porcelain insulator 2 can pass, the a-frame 52 is V-shaped, two ends of the a-frame 52 can correspond to two corners of the square pressure plate 51, through holes through which bolts pass are formed at the corners of the square pressure plate 51 and two ends of the a-frame 52, in the installation process, the square pressure plate 51 is sleeved outside the porcelain insulator 2, two bolts penetrate through the through holes at two corners of the square pressure plate 51 and are screwed into the transformer box 1, two ends of the a-frame 52 are respectively arranged above two corners of the square pressure plate 51, then the two bolts penetrate through the a-frame 52 and the square pressure plate 51 and are sequentially arranged in the transformer box 1, the tip of the a-frame 52 extends to one side of the transformer box 1, finally, a second lightning rod 6 is positioned at the tip of the a-frame 52 in a threaded connection or welding mode, in this way, the design can be used for simplifying the design, the mounting and dismounting and mounting can be accomplished, and dismounting can be replaced by changing the specifications of the porcelain insulator 2, and the mounting and dismounting can be simplified, and mounting and dismounting and mounting can not affect the mounting of the porcelain insulator 2.
As a specific implementation manner of improvement, referring to fig. 2, the plurality of connecting frames 5 further comprise presser feet 53 positioned below the square pressure plate 51 and pressed on the bottom end of the porcelain bottle 2, the number of the presser feet 53 required by each connecting frame 5 is two, each presser foot 53 is made of an insulating material, through holes for the bolts to penetrate are formed in the presser feet 53, in the installation process, the two presser feet 53 are arranged on the upper surface of the transformer box 1 in a diagonal manner, one ends of the two presser feet 53 are equalized on the bottom end of the porcelain bottle 2, then the square pressure plate 51 is sleeved outside the porcelain bottle 2 and moves downwards to a position contacting with the top surface of the presser feet 53, then one bolt penetrates through the square pressure plate 51 and one presser foot 53 and is screwed into the transformer box 1, then two ends of the triangular bracket 52 are arranged above the square pressure plate 51, the other bolt penetrates through one end of the triangular bracket 52, the square pressure plate 51 and the other presser foot 53 and is screwed into the transformer box 1, and finally the two remaining corners of the two bolts are installed, compared with the design that the bolts penetrate through the bottom end of the porcelain bottle 2 directly and are screwed into the bottom end of the porcelain bottle 2 and the transformer box 1, the design of the porcelain bottle 2 is simplified, and the size of the porcelain bottle can be reduced, and the porcelain bottle can be stably processed by the design of the porcelain bottle 2, and the size of the porcelain bottle is more than the porcelain bottle 2 is designed, and the porcelain bottle is more stable, and the size of the porcelain bottle can be greatly reduced, and the size of the bottom end of the insulator is designed.
As a specific implementation manner of improvement, referring to fig. 1, a supporting plate component 7 corresponding to a plurality of porcelain bottles 2 one by one and a lightning arrester 8 positioned on the supporting plate component 7 are fixedly connected to a side wall of the transformer box body 1, the supporting plate component 7 can be a straight plate, one end of the supporting plate component is positioned on the side wall of the transformer box body 1, the straight plate is horizontally arranged and insulated, the lightning arrester 8 is vertically positioned on one end of the straight plate far away from the transformer box body 1, a grounding wire is electrically connected below the lightning arrester 8, the voltage generated by lightning impact can be greatly reduced by the design of the lightning arrester 8, so that the voltage value reaching the first lightning rod 4 is small, the effective application of the first lightning rod 4 is further ensured, and the possibility of damage of the first lightning rod 4 is reduced.
As a specific embodiment of improvement, referring to fig. 1, the plurality of support plate assemblies 7 each include a static plate 71 and a moving plate 72, the static plate 71 and the moving plate 72 are made of insulating materials, long holes extending along the width direction of the transformer box 1 are formed in the static plate 71, through holes through which bolts penetrate are formed in the moving plate 72, one end of the static plate 71 is positioned on the side wall of the transformer box 1, the moving plate 72 is locally arranged below the static plate 71, the through holes correspond to the long holes, the bolts penetrate through the moving plate 72 and the static plate 71 from bottom to top successively and are screwed on the end portions of the bolts penetrating through the static plate 71 by nuts, the moving plate 72 can move along the length direction of the long holes by unscrewing the nuts, and the linear distance between the lightning arrester 8 and the porcelain bottle 2 can be changed according to use environments, so that voltages generated under different environments can be effectively slowed down, and the application range is wide.
In order to solve the above problem, referring to fig. 1, a heat sink group 11 is fixedly connected to a side wall of a transformer tank 1, the heat sink group 11 located below the heat sink 72 can support the heat sink 72, the heat sink group 11 can improve heat dissipation of the transformer tank 1, thereby reducing the temperature inside the transformer tank 1 and ensuring normal use of each part, and the heat sink group 11 can slow down the downward bending degree of the heat sink 72 and the static plate 71, thereby indirectly improving the structural stability of the static plate 71 and the heat sink 72.
As a specific implementation mode of improvement, referring to FIG. 1, the bottom ends of the plurality of lightning arresters 8 are fixedly connected with brackets 9 connected with corresponding movable plates 72, reinforcing ribs 91 which can be propped against a radiating fin group 11 are arranged on the plurality of brackets 9, the brackets 9 can be quickly assembled and disassembled between the lightning arresters 8 and the movable plates 72, the lightning arresters 8 can be timely replaced after being damaged, the bending resistance of suspended parts of the brackets 9 is improved by the reinforcing ribs 91, the distance between the reinforcing ribs 91 and the radiating fin group 11 can be a safe distance for providing an adjustable distance between the lightning arresters 8 and porcelain bottles 2, and the defect that the lightning arresters 8 cannot fully relieve the damage caused by overlarge voltage borne by the first lightning arresters 4 and the second lightning arresters 6 due to the fact that the distance between the lightning arresters 8 and the porcelain bottles 2 is too small can be overcome.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421955133.XU CN222927312U (en) | 2024-08-12 | 2024-08-12 | Oil immersed transformer with overvoltage protection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421955133.XU CN222927312U (en) | 2024-08-12 | 2024-08-12 | Oil immersed transformer with overvoltage protection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222927312U true CN222927312U (en) | 2025-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421955133.XU Active CN222927312U (en) | 2024-08-12 | 2024-08-12 | Oil immersed transformer with overvoltage protection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222927312U (en) |
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2024
- 2024-08-12 CN CN202421955133.XU patent/CN222927312U/en active Active
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