A stacker for a surge arrester core

Abstract

The application discloses a stacker for a lightning arrester core body, and belongs to the technical field of power equipment. The stacker comprises an upper cover, a lower cover and an elastic connecting piece. The outer diameter of the inner space circumferential wall of the lower cover matches the inner diameter of the inner space circumferential wall of the upper cover, and part of the inner space circumferential wall of the lower cover is inserted into the inner space circumferential wall of the upper cover to serve as the inner space of the stacker. The insertion length is adjusted by the elastic connecting piece. The upper cover and the lower cover are both provided with elastic adjusting valves, and the elastic connecting piece is installed in the inner space through the elastic adjusting valves. The device is flexible in height adjustment, is suitable for various lightning arrester core body sizes, and has adjustable stacker component rigidity, so that the side bending problem of the core body can be effectively avoided. The stacker can improve the internal electric field distribution of the lightning arrester, reduce the electric field gradient, and uniformly distribute the voltage distribution characteristics of the valve piece. The design and implementation mode are simple, and the electrical performance of the valve piece itself does not need to be changed.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and more particularly to a stacker for a lightning arrester core. Background Art

[0002] Lightning arresters are used to limit the voltage at a specific location during an overvoltage event, thereby protecting equipment, circuits, or components in a system. Currently, the most commonly used type is the metal oxide arrester (MOA). This type of arrester contains a cylindrical core composed of multiple valve plates, which are installed within an insulating porcelain sleeve. The volt-ampere characteristics of the valve plates behave as nonlinear resistors. At high voltages, the valve plates exhibit high conductivity, while at low voltages, the conductivity decreases. The valve plates are the physical foundation of the arrester's external performance.

[0003] Each valve plate in a lightning arrester has a specific withstand voltage and current capacity. The arrester's withstand voltage is achieved by stacking multiple valve plates to form the core. However, the length of a designed arrester core is often shorter than the length of the insulating porcelain sleeve. Therefore, additional mounting components are required to ensure that arrester cores and insulating porcelain sleeves of different heights can be effectively assembled together.

[0004] When the length of the arrester's core is very long, the voltage distribution on each valve plate is uneven, which in turn affects the arrester's protection performance and operational reliability. In addition, the temperature and humidity inside the arrester's insulating porcelain sleeve are also important factors affecting the arrester's operational reliability. Therefore, temperature and humidity are also important variables that need to be monitored during the operation of the arrester, and effective space must be provided for the installation of various sensors.

[0005] In response to some of the problems that need to be solved by the above-mentioned lightning arrester, the existing technical solution realizes the assembly between cores of different heights and insulating porcelain sleeves by installing retaining parts at both ends of the core. The retaining part is installed between the core and the spring component on the flange. A pre-tightening force is applied to the arrester core by the spring to compact each valve plate. Through finite element simulation calculation, the electric field distribution inside and outside the arrester and the distribution of the withstand voltage on each valve plate in the arrester core are obtained. When the voltage unevenness coefficient and the voltage sharing rate do not meet the standards, the main capacitance of the valve plate is adjusted by adjusting the dielectric constant and height, radius and other dimensions of the arrester valve plate, thereby achieving the purpose of improving the voltage distribution. The temperature sensor is installed in a metal package, which is inserted between the valve plates of the arrester. The temperature on the valve plate inside the arrester can be measured by this technology. The above-mentioned metal package is generally the same shape as the arrester valve plate.

[0006] However, the above technical method, although the retaining parts are installed at the two ends of the core body formed by the stacking of the valve plates of the lightning arrester, can improve the assembly problems caused by the difference in the length of the core body and the length of the insulating sleeve to a certain extent. However, this method has very high requirements on the processing technology of the stacked valve plates and the consistency of the material elasticity between multiple valve plates. Once the central axis of the valve plates deviates when the valve plates are stacked or the stress-strain elastic properties of the valve plates are different, when prestress is applied to the ends of the core body, the core body structure is prone to lateral bending. When large currents flow together, excessive electromagnetic stress will cause the structure to suddenly disintegrate. Although changing the main capacitance between the valve plates is an effective way to optimize the voltage distribution of the core body inside the lightning arrester. However, the means of changing the main capacitance is to adjust the dielectric constant of the valve plate material and the height, diameter and other dimensions of the valve plate. This means will have a significant impact on the electrical properties of the valve plate, and the adjustment of the dielectric constant involves changes in processes such as raw material ratio and sintering time, which is not conducive to large-scale production and is very costly. Although the elasticity difference between the arrester valve plate and the metal housing encapsulating the temperature sensor makes it easy for mechanical oscillations to occur between the core segments of each valve plate during the arrester's operation, mechanical oscillations can significantly reduce the sensor's signal-to-noise ratio. In more serious cases, structural resonance can occur, leading to structural disintegration. Summary of the Invention

[0007] In view of the above problems, the present invention proposes a stacker for a lightning arrester core, comprising: an upper cover, a lower cover and an elastic connecting member;

[0008] The upper cover is in the shape of a disc, and the edge of the disc extends upward as the upper cover fixing edge of the lightning arrester valve plate, and the edge of the disc extends downward as the circumferential wall of the upper cover inner space. The lower cover is in the shape of a disc, and the edge of the disc extends downward as the lower cover fixing edge of the lightning arrester valve plate, and the edge of the disc extends upward as the circumferential wall of the lower cover inner space. The outer diameter of the circumferential wall of the lower cover inner space matches the inner diameter of the circumferential wall of the upper cover inner space, and part of the circumferential wall of the lower cover inner space is inserted into the circumferential wall of the upper cover inner space to serve as the inner space of the stacker. The insertion length is adjusted by the elastic connecting piece. Elastic regulating valves are provided on both the upper cover and the lower cover, and the elastic connecting piece is installed in the inner space through the elastic regulating valve.

[0009] Optionally, the elastic connection member adjusts its elasticity through the elasticity regulating valve.

[0010] Optionally, a sensor base is provided on the lower cover, and the sensor base is used to install the sensor.

[0011] Optionally, the upper cover is made of metal, the height of the upper cover fixed edge is at least 3 mm, and the inner diameter of the upper cover fixed edge is greater than or equal to the outer diameter of the arrester valve plate.

[0012] Optionally, the lower cover is made of metal, the height of the fixed edge of the lower cover is at least 3 mm, and the inner diameter of the fixed edge of the lower cover is greater than or equal to the outer diameter of the arrester valve plate.

[0013] Optionally, the elastic connecting member includes at least one piece.

[0014] Optionally, if there is one elastic connecting member, the elastic regulating valve is located at the center of the upper cover and the lower cover.

[0015] Optionally, if the number of the elastic connecting member is greater than one, the elastic regulating valve is located on the circumference of the central axis of the upper cover and the lower cover, and the circumferential radius is smaller than the inner space radius.

[0016] Optionally, the elastic connecting member is a metal elastic mechanism.

[0017] Optionally, the sensor base is provided with mounting screw holes and mounting pressing pieces for mounting the sensor.

[0018] Optionally, the stacker is installed in the middle, upper middle or lower middle of the arrester core, and the number of stackers installed is one or more.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a stacker for a lightning arrester core, characterized in that the stacker comprises: an upper cover, a lower cover and an elastic connecting piece; the upper cover is in the shape of a disc, the edge of the disc extends upward as the upper cover fixing edge of the lightning arrester valve plate, and the edge of the disc extends downward as the circumferential wall of the upper cover inner space, the lower cover is in the shape of a disc, the edge of the disc extends downward as the lower cover fixing edge of the lightning arrester valve plate, and the edge of the disc extends upward as the circumferential wall of the lower cover inner space, the outer diameter of the circumferential wall of the lower cover inner space matches the inner diameter of the circumferential wall of the upper cover inner space, and part of the circumferential wall of the lower cover inner space is inserted into the circumferential wall of the upper cover inner space to serve as the inner space of the stacker, the insertion length is adjusted by the elastic connecting piece, and the upper cover and the lower cover are both provided with elastic regulating valves, the elastic connecting piece is installed in the inner space through the elastic regulating valve, and the elasticity is adjusted by the elastic regulating valve, and the lower cover is provided with a sensor base, and the sensor base is used to install a sensor. The height of the device of the present invention is flexible to adjust, and it is adaptable to a variety of lightning arrester core sizes. The stiffness of the stacked components is adjustable, which can effectively avoid the lateral bending problem of the core; it can improve the electric field distribution inside the lightning arrester, reduce the electric field gradient, and uniform the valve plate voltage distribution characteristics. The design and implementation method is simple and there is no need to change the electrical performance of the valve plate itself; it provides assembly space for a variety of sensors, has little impact on the electrical performance, and contributes to improving the signal-to-noise ratio and reliability of the sensor; the present invention can solve a variety of engineering and technical problems at one time, and has the advantages of low cost and simple and convenient implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural diagram of the stacker of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation of the stacker of the present invention;

[0023] Figure 3 This is a structural diagram of the elastic regulating valve of the present invention;

[0024] Figure 4 This is a schematic diagram of the implementation of Example 2 of the present invention. DETAILED DESCRIPTION

[0025] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0026] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0027] Example 1:

[0028] The present invention proposes a stacker for a lightning arrester core, such as Figure 1 As shown, it includes: an upper cover, a lower cover, an elastic connecting mechanism, a sensor base, a sensor and an elastic regulating valve; the number of valve plates of the lightning arrester shown is 12 as an example, which are numbered 1 to 12 from top to bottom. After the stacker in this embodiment is assembled, the valve plates are evenly separated, that is, the installation position of the No. 1 stacker is between the No. 4 valve plate and the No. 5 valve plate, and the installation position of the No. 2 stacker is between the No. 8 valve plate and the No. 9 valve plate, as shown in FIG. Figure 2 As shown;

[0029] Upper cover: Metal material, preferably copper, but other materials are also acceptable; the upper cover is disc-shaped, with the edge of the disc extending upward to form a fixed edge of the valve disc, the height of the fixed edge being 3mm or more, and the inner diameter of the fixed edge being greater than or equal to the outer diameter of the arrester valve disc; the edge of the disc extending downward to form the inner space wall, the longitudinal length of which is greater than the sensor installation height;

[0030] Lower cover: Metal material, preferably copper, but other materials are also acceptable; the lower cover is disc-shaped, with the edge of the disc extending downward to form a fixed edge for the valve disc, the fixed edge having a height of 3mm or more, and an inner diameter greater than or equal to the outer diameter of the arrester valve disc; the edge of the disc extending upward to form a peripheral wall of the inner space, the outer diameter of which matches the inner diameter of the lower extended peripheral wall of the upper cover, so that the peripheral wall of the lower cover can be partially inserted into the inner space formed by the peripheral wall of the upper cover;

[0031] Elastic connector: Figure 3 As shown, the elastic connector is located in the inner space of the stacked components; the number of the elastic connector is 1, and its upper end and lower end are respectively connected to the center of the upper cover and the center of the lower cover; the elastic connector is a metal structure, and the elastic mechanism is a metal disc spring or other suitable spring mechanism.

[0032] Sensor base: The base of the temperature sensor is located on the lower cover. The base is equipped with mounting screw holes and a mounting pressure piece to ensure that the temperature sensor can be in close contact with the lower cover, thereby improving the accuracy of temperature measurement.

[0033] Temperature sensor: The temperature sensor is installed on the temperature sensor base, and the temperature sensor is pressed inside the lower cover by the installation pressing piece;

[0034] Other sensors: If the internal space of the stacked components allows, humidity sensors, current sensors, voltage sensors, vibration sensors, air pressure sensors, strain sensors, etc. can be configured inside.

[0035] Elasticity regulating valve: located at the outer center of the upper cover or the outer center of the lower cover, it can be used to adjust the elasticity of the stacked components.

[0036] Example 2:

[0037] Another embodiment of the stacker proposed by the present invention, as shown in Figure 4, includes: an upper cover, a lower cover, an elastic connecting mechanism, a sensor base, a sensor, and an elastic regulating valve. The number of valve plates in the lightning arrester shown is 24, numbered 1 to 24 from top to bottom. After the two stackers in this embodiment are assembled, the valve plates are unevenly separated, that is, stacker No. 1 is installed between valve plates No. 3 and No. 4, and stacker No. 2 is installed between valve plates No. 10 and No. 11. Because the upper part of the high-voltage lightning arrester has a greater degree of unevenness, this arrangement can further improve the voltage uniformity of the stacker at a limited cost.

[0038] Upper cover: Metal material, preferably copper, but other materials are also acceptable; the upper cover is disc-shaped, with the edge of the disc extending upward to form a fixed edge for the valve disc, the height of the fixed edge being 3mm or more, and the inner diameter of the fixed edge being greater than or equal to the outer diameter of the arrester valve disc; the edge of the disc has no circumferential wall extending downward;

[0039] Lower cover: metal material, preferably copper, but other materials are also acceptable; the lower cover is disc-shaped, with the edge of the disc extending downward to form a valve plate fixed edge, the fixed edge height is 3mm or more, and the inner diameter of the fixed edge is greater than or equal to the outer diameter of the arrester valve plate; the edge of the disc has no circumferential wall extending upward;

[0040] Elastic connectors: These are located within the stacking unit's interior space. There are three elastic connectors, evenly distributed along a circle centered on the line connecting the centers of the upper and lower covers, with a radius equal to or less than the inner diameter of the stacking unit's interior space. These connectors are metal, and the elastic mechanism is a metal disc spring or other suitable spring mechanism. Increasing the number of elastic connectors can improve the stacker's lateral stability, while also compressing the longitudinal space and reducing the overall height while maintaining the same support force.

[0041] Sensor base: The base of the temperature sensor is located on the lower cover. The base is equipped with mounting screw holes and a mounting pressure piece to ensure that the temperature sensor can be in close contact with the lower cover, thereby improving the accuracy of temperature measurement.

[0042] Temperature sensor: The temperature sensor is installed on the temperature sensor base, and the temperature sensor is pressed inside the lower cover by the installation pressing piece;

[0043] Other sensors: If the internal space of the stacked components allows, humidity sensors, current sensors, voltage sensors, vibration sensors, air pressure sensors, strain sensors, etc. can be configured inside.

[0044] Elasticity regulating valve: located at the outer center of the upper cover or the outer center of the lower cover, it can be used to adjust the elasticity of the stacked components.

[0045] The technical principles of the present invention are as follows:

[0046] The stacker (stacked component) can extend the overall length of the arrester core to achieve the purpose of adapting to the height of the insulating porcelain sleeve. The distance between the upper and lower covers of the stacked component can be adjusted according to needs, and the number of stacked components can also be adjusted according to needs;

[0047] The elasticity of the stacked components is adjustable, which will not apply excessive prestress to the arrester valve plate. The force-applying bodies are dispersed at multiple locations on the arrester core, making the force on each valve plate more uniform. The stacked components have a valve plate fixing edge, ensuring that the valve plate axis and the axis of the stacked components coincide with each other. The above measures make it more difficult for the arrester core as a whole to bend sideways.

[0048] The stacked components are metal structures. In the electric field, the stacked components are equipotential bodies, and the electric field around them will be more uniform. According to the uneven voltage distribution of the arrester valve plates, assembling stacked components in places where the voltage gradient is too large can play a role in uniform electric field and improve the voltage between valve plates;

[0049] The stacked components have a hollow interior, providing effective space for the installation of various sensors. The internal sensor base is equipped with mounting structures such as a press piece to ensure the effectiveness of sensor measurements.

[0050] The present invention is slightly larger than the valve plate diameter and has a fixed groove for ensuring alignment with the center axis of the valve plate. The component is installed in the middle, upper middle or lower middle of the entire arrester core body. The number of installations can be one or more, such as Figure 2 As shown, the elasticity of the component can be adjusted by a disc spring or other forms of spring. The above measures can prevent the arrester core from lateral bending.

[0051] The stacked component housing (upper cover and lower cover) of the present invention uses a metal structure. By designing the position and height of the insertion of the lightning arrester core, the main capacitance of the valve plate is changed, thereby achieving the purpose of optimizing the electric field distribution of the lightning arrester core.

[0052] There is additional space inside the stacked components for installing temperature sensors and humidity sensors. Its adjustable elasticity can prevent large-scale vibration of the lightning arrester core and sensors, improve the problem of mechanical vibration reducing the sensor signal-to-noise ratio, and improve the stability of the structure.

[0053] In summary, this stacked component is a metal structure with adjustable elasticity. Its internal space is equipped with a temperature sensor and a humidity sensor, which can solve the problems of core side bending, uneven voltage distribution and providing installation space for various types of sensors in the existing technology.

[0054] The height of the device of the present invention is flexible to adjust, and it is adaptable to a variety of lightning arrester core sizes. The stiffness of the stacked components is adjustable, which can effectively avoid the lateral bending problem of the core; it can improve the electric field distribution inside the lightning arrester, reduce the electric field gradient, and uniform the valve plate voltage distribution characteristics. The design and implementation method is simple and there is no need to change the electrical performance of the valve plate itself; it provides assembly space for a variety of sensors, has little impact on the electrical performance, and contributes to improving the signal-to-noise ratio and reliability of the sensor; the present invention can solve a variety of engineering and technical problems at one time, and has the advantages of low cost and simple and convenient implementation.

[0055] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0056] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A stacker for a lightning arrester core, characterized in that: The stacker comprises an upper cover, a lower cover and an elastic connecting member; The upper cover is in the shape of a disc, and the edge of the disc extends upward as the upper cover fixing edge of the arrester valve plate, and the edge of the disc extends downward as the circumferential wall of the upper cover inner space; the lower cover is in the shape of a disc, and the edge of the disc extends downward as the lower cover fixing edge of the arrester valve plate, and the edge of the disc extends upward as the circumferential wall of the lower cover inner space; the outer diameter of the circumferential wall of the lower cover inner space matches the inner diameter of the circumferential wall of the upper cover inner space, and part of the circumferential wall of the lower cover inner space is inserted into the circumferential wall of the upper cover inner space to serve as the inner space of the stacker, and the length of the insertion is adjusted by the elastic connecting piece, and the upper cover and the lower cover are both provided with elastic regulating valves, and the elastic connecting piece is installed in the inner space through the elastic regulating valve; The lower cover is provided with a sensor base, and the sensor base is used to install the sensor; The sensor base is provided with mounting screw holes and mounting pressing pieces for mounting the sensor; The elastic connecting piece is a metal elastic mechanism, and the metal elastic mechanism is a metal disc spring.

2. The stacker according to claim 1, wherein: The elastic connection member adjusts its elasticity through the elasticity regulating valve.

3. The stacker according to claim 1, wherein: The height of the upper cover fixed edge is at least 3mm, and the inner diameter of the upper cover fixed edge is greater than or equal to the outer diameter of the arrester valve plate.

4. The stacker according to claim 1, wherein: The height of the fixed edge of the lower cover is at least 3 mm, and the inner diameter of the fixed edge of the lower cover is greater than or equal to the outer diameter of the arrester valve plate.

5. The stacker according to claim 1, wherein: The elastic connecting member includes at least one piece.

6. The stacker according to claim 5, wherein: If there is one elastic connecting member, the elastic regulating valve is located at the center of the upper cover and the lower cover.

7. The stacker according to claim 5, wherein: If the number of the elastic connecting member is greater than one, the elastic regulating valve is located on the circumference of the central axis of the upper cover and the lower cover, and the circumference radius is smaller than the inner space radius.

8. The stacker according to claim 1, wherein: The stacker is installed in the middle, upper middle or lower middle part of the arrester core, and the number of the stackers installed is one or more.

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