A separable disconnector and lightning arrester

Abstract

The present application provides a detachable disconnector and a lightning arrester, which belongs to the technical field of lightning arresters. Among them, the detachable disconnector includes a first shell and a second shell, the first shell is provided with a conductive electrode and an adsorption member inside, and the conductive electrode is used to connect to the line side of the lightning arrester; the second shell is abutted with the first shell, and the second shell is provided with a connecting electrode, a grounding electrode, an electric heating element and a magnetic element; the grounding electrode is used to connect to the grounding side of the lightning arrester; the electric heating element connects the connecting electrode and the grounding electrode, and is configured to generate heat due to the fault current of the lightning arrester; the magnetic element is arranged around the circumference of the electric heating element, and the magnetic element has a magnetic state and a demagnetized state in which the magnetism is lost due to the heat received from the electric heating element. The detachable disconnector provided in the embodiment of the present application can be used repeatedly, which is conducive to reducing maintenance costs.

Description

Technical Field

[0001] The present application relates to disconnector technology, and in particular to a detachable disconnector and lightning arrester. Background Art

[0002] The disconnector is a component that works in conjunction with the lightning arrester. The main function of the disconnector is to use the power frequency short-circuit current flowing through the lightning arrester to cause the disconnector to operate and disconnect the circuit when a lightning arrester fails, such as a breakdown. This automatically disconnects the grounding terminal of the lightning arrester, and the lightning arrester exits system operation, making it easier for maintenance personnel to find the fault point in time for maintenance and replacement.

[0003] In the related art, the disconnector is generally a disposable component. After a lightning arrester breakdown fault occurs, the disconnector performs a destructive disconnection action that cannot be restored to its original state. When replacing the faulty lightning arrester, a new disconnector needs to be replaced at the same time, resulting in high cost of using the disconnector. Summary of the Invention

[0004] The present application provides a detachable disconnector and a lightning arrester, which are used to solve the technical problem in the related art that the disconnector is a disposable product resulting in high cost.

[0005] In one aspect, the present application provides a detachable disconnector, comprising:

[0006] A first shell having a conductive electrode and an adsorption member disposed therein, wherein the conductive electrode is used to connect to the line side of the arrester;

[0007] a second housing abutting the first housing, wherein a connecting electrode, a grounding electrode, an electric heating element, and a magnetic element are disposed within the second housing; the grounding electrode being configured to be connected to a ground side of the lightning arrester; the electric heating element being connected to the connecting electrode and the grounding electrode and configured to generate heat due to a fault current of the lightning arrester; the magnetic element being arranged around a circumference of the electric heating element, the magnetic element having a magnetic state and a demagnetized state in which the magnetic element loses its magnetism due to receiving heat from the electric heating element;

[0008] A limiting portion is formed on a side of the magnetic member facing the electric heating element, and the limiting portion surrounds at least a portion of the connecting electrode and at least a portion of the grounding electrode to limit the connecting electrode and the grounding electrode from being separated from the second housing, and the electric heating element is sandwiched between the connecting electrode and the grounding electrode;

[0009] In the magnetic state, the magnetic member is magnetically connected to the adsorption member to connect the conductive electrode to the connecting electrode; in the demagnetized state, the magnetic member is disconnected from the adsorption member to disconnect the conductive electrode from the connecting electrode.

[0010] In some possible implementations, the magnetic component includes a first magnet and a second magnet that are magnetically connected, and at least one of the first magnet and the second magnet is configured with the limiting portion.

[0011] In some possible implementations, along the current direction of the connecting electrode, the end of the connecting electrode toward the electric heating element gradually expands outward to form a first limiting end, and the end of the grounding electrode toward the electric heating element gradually expands outward to form a second limiting end;

[0012] The limiting portion is a groove provided on the magnetic component, the opening direction of the groove is toward the electric heating element, and the groove is jointly clamped with the first limiting end and the second limiting end.

[0013] In some possible implementations, both the first magnet and the second magnet are configured with a limiting portion.

[0014] In some possible implementations, a protruding limiting boss is configured on one side of the conductive electrode connected to the connecting electrode, and the adsorption element is arranged around the circumference of the limiting boss;

[0015] At least a portion of the connecting pole protrudes from the second shell, and the protruding portion of the connecting pole is engaged with the limiting boss.

[0016] In some possible implementations, a seal is embedded between the connecting electrode and the second shell; and / or a seal is embedded between the grounding electrode and the second shell.

[0017] In some possible embodiments, an elastic member is connected to the side end of the first shell abutting against the second shell, and the elastic member abuts against the second shell, and the elastic member has an elastic force that drives the second shell away from the first shell;

[0018] In the magnetic state, the magnetic attraction force of the magnetic member is greater than the elastic force of the elastic member. In the demagnetized state, the magnetic attraction force of the magnetic member is less than the elastic force of the elastic member.

[0019] In some possible implementations, along the direction from the center of the electric heating element to the outside, the current density outside the electric heating element is greater than the current density inside the electric heating element.

[0020] In some possible implementations, an insulating filler is provided in the second shell, and the filler encapsulates the connecting electrode, the grounding electrode, the magnetic component, and the electric heating element in the second shell.

[0021] On the other hand, the present application provides a lightning arrester, comprising a lightning arrester body and any one of the above-mentioned detachable disconnectors connected to the lightning arrester body.

[0022] The detachable disconnector and lightning arrester provided in the present application are divided into a first shell and a second shell in the detachable disconnector, and all components are integrated and installed in the shell. The magnetic part loses its magnetism when it reaches a critical temperature after being heated by the electric heating element, but the magnetism will automatically recover after cooling. Therefore, after the lightning arrester fault is eliminated, the disconnector only needs to reconnect the detached first shell and second shell to restore normal function. There is no need to replace the magnetic part or the electric heating element, and there is no physical damage, which is conducive to reducing maintenance costs.

[0023] In addition, the disconnector can be used for multiple high-temperature demagnetization tests during the factory inspection stage and can be used normally after the test. Compared with the disconnector with destructive disconnection action in related technologies, it can more accurately test the use effect of the disconnector, reduce the waste of inspection and testing, and help ensure product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 This is a schematic diagram of the overall structure of the detachable disconnector in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic structural diagram of the first shell;

[0027] Figure 3 for Figure 1 A schematic structural diagram of the second shell;

[0028] Figure 4 Schematic diagram of the structure of the magnetic component in the embodiment of the present application.

[0029] Description of Reference Numerals

[0030] 100, first shell; 101, conductive electrode; 1011, limiting boss; 102, adsorption element;

[0031] 200, second housing; 201, connecting electrode; 2011, second limiting end; 202, grounding electrode; 2021, first limiting end; 203, electric heating element;

[0032] 204, magnetic member; 2041, limiting portion; 2042, first magnet; 2043, second magnet.

[0033] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0037] The terms "first," "second," "third," "fourth," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0038] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0039] As mentioned in the background, lightning arresters (LAAs) are key devices in power systems that protect power transmission and distribution equipment from lightning overvoltages and switching overvoltages. When an arrester fails due to aging, insulation degradation, or external shock, it can overheat due to continuous power-frequency leakage current or short-circuit current, potentially causing serious accidents such as explosions and fires.

[0040] In order to isolate the faulty lightning arrester in time and avoid the expansion of the accident, the disconnector is widely deployed in the lightning arrester grounding loop as a safety protection device. Its core function is to quickly cut off the connection between the lightning arrester and the system when abnormal current is detected.

[0041] Traditional disconnectors typically include thermal explosion disconnectors and thermal melt disconnectors. Specifically, when a short-circuit occurs in a lightning arrester, a power-frequency short-circuit current flows through the thermal explosion disconnector, causing the thermistor to heat up and the thermal explosion element in contact with it to explode and eject (similar to the principle of a bullet). This explosion ruptures weak points in the outer casing, partially dislodging the grounding bolt, and causing the faulty lightning arrester to exit the system. Thermal melt disconnectors, which operate on a similar principle, utilize the power-frequency short-circuit current flowing through the failed arrester to melt the alloy fuse in the disconnector. The spring force then separates the upper and lower parts of the disconnector, ultimately achieving disconnection.

[0042] Both of the above-mentioned disconnectors have a one-time destructive disconnecting action. After the lightning arrester is repaired, a new disconnector needs to be replaced and put into use, resulting in a high cost of the disconnector. In addition, each replacement of the disconnector also involves the connection of specific lines between the lightning arrester and the disconnector, making the maintenance of the lightning arrester difficult and time-consuming.

[0043] Based on the above related technical description, the embodiment of the present application provides a detachable disconnector and a lightning arrester. The detachable disconnector specifically includes a first shell and a second shell. The components are integrated and installed in each shell. The magnetic part loses its magnetism when it reaches a critical temperature after being heated by the electric heating element, but the magnetism will automatically recover after cooling. Therefore, after the lightning arrester fault is eliminated, the disconnector only needs to reconnect the detached first shell and the second shell to restore normal function. There is no need to replace the magnetic part or the electric heating element, and there is no physical damage, which is conducive to reducing maintenance costs.

[0044] The detachable disconnector according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, an embodiment of the present application provides a detachable disconnector, comprising a first shell 100 and a second shell 200 that abut against each other.

[0046] Among them, a conductive electrode 101 and an adsorption component 102 are provided inside the first shell 100, and the conductive electrode 101 is used to connect to the line side of the lightning arrester; a connecting electrode 201, a grounding electrode 202, an electric heating element 203 and a magnetic component 204 are provided inside the second shell 200; the grounding electrode 202 is used to connect to the grounding side of the lightning arrester; the electric heating element 203 is connected to the connecting electrode 201 and the grounding electrode 202, and is configured to generate heat due to the fault current of the lightning arrester; the magnetic component 204 is arranged around the circumference of the electric heating element 203, and the connecting electrode 201, the electric heating element 203 and the grounding electrode 202 are arranged in sequence downward along the height direction.

[0047] A limiting portion 2041 is constructed on one side of the magnetic member 204 facing the electric heating element 203. The limiting portion 2041 surrounds at least part of the connecting pole 201 and at least part of the grounding pole 202 to limit the connecting pole 201 and the grounding pole 202 from being separated from the second shell 200. The electric heating element 203 is clamped between the connecting pole 201 and the grounding pole 202.

[0048] The magnetic member 204 has a magnetic state and a demagnetized state in which it loses its magnetism due to receiving heat from the electric heating element 203; in the magnetic state, the magnetic member 204 is magnetically connected to the adsorption member 102 to connect the conductive electrode 101 to the connecting electrode 201; in the demagnetized state, the magnetic member 204 is disconnected from the adsorption member 102 to disconnect the conductive electrode 101 from the connecting electrode 201.

[0049] In the above scheme, the first shell 100 and the second shell 200 are connected only through the magnetic adsorption effect of the magnetic part 204 and the adsorption part 102. Since the magnetic part 204 switches to the demagnetized state due to heat, the second shell 200 will be separated from the first shell 100 under the action of gravity, thereby quickly cutting off the circuit of the disconnector; when the staff needs to reconnect the disconnector after the maintenance is completed, since the magnetic part 204 is no longer heated and returns to the magnetic state, the first shell 100 and the second shell 200 can continue to be connected, and there is no need to dismantle or change the internal components of the disconnector, which effectively reduces the difficulty of maintenance and reduces the cost of using the disconnector product.

[0050] In the embodiment of the present application, the first housing 100 and the second housing 200 are made of a high-temperature resistant insulating material, such as an engineering plastic material, a ceramic-based composite material, etc. For example, the first housing 100 is an integrally cast plastic housing. The conductive electrode 101 is fixed in the first housing 100. The adsorption member 102 is provided on the side of the first housing 100 for contact with the second housing 200 to enhance the adsorption effect of the adsorption member 102 and the magnetic member 204. The conductive electrode 101 of the first housing 100 is fixedly connected to the line side of the arrester body, and the grounding electrode 202 of the second housing 200 is connected to the ground side of the arrester body.

[0051] Here, generally, the disconnector is vertically connected to the lightning arrester body, that is, the first shell 100 itself is in a fixed state, and the magnetic part 204 in the magnetic state is magnetically connected to the adsorption part 102, so that the second shell 200 is adsorbed on the first shell 100. When the magnetic part 204 is in a demagnetized state, the gravity of the second shell 200 itself is greater than the magnetic adsorption force, and the second shell 200 detaches from the first shell 100 and falls, causing the disconnector to detach.

[0052] like Figure 3 As shown, in some embodiments, a slot is provided on the side of the connecting electrode 201 facing the electric heating element 203, and a slot is also provided on the side of the grounding electrode 202 facing the electric heating element 203. The size of the slot matches the size of the electric heating element 203. When the disconnector is in normal working condition, a current path of the conductive electrode 101-connecting electrode 201-electric heating element 203-grounding electrode 202 is formed, and the electric heating element 203 is engaged and connected to the slots of the connecting electrode 201 and the grounding electrode 202, thereby further improving the conductive effect between the electric heating element 203 and the connecting electrode 201, and the electric heating element 203 and the grounding electrode 202.

[0053] Because the connecting electrode 201 and the grounding electrode 202 clamp the electric heating element 203, the fault current of the lightning arrester is forced to flow through the electric heating element 203, without generating other circuit losses. In addition, the provided slot also facilitates the pre-assembly and fixing of the electric heating element 203 between the connecting electrode 201 and the grounding electrode 202, which is conducive to improving the efficiency of assembly and disassembly. Furthermore, the circumferential side of the electric heating element 203 is silver-plated or coated with thermal grease to further enhance the heat transfer effect and ensure that the heat is efficiently transferred to the magnetic element 204.

[0054] In some embodiments, along the current direction of the connecting pole 201, the end of the connecting pole 201 toward the electric heating element 203 gradually expands outward to form a first limiting end 2021, and the end of the grounding pole 202 toward the electric heating element 203 gradually expands outward to form a second limiting end 2011; the limiting portion 2041 is a groove provided on the magnetic part 204, and the opening direction of the groove is toward the electric heating element 203, and the grooves jointly clamp the first limiting end 2021 and the second limiting end 2011.

[0055] In the above embodiment, the first limiting end 2021 and the second limiting end 2011 are designed to be expanded outward, which increases the contact area between the limiting portion 2041 and the connecting pole 201 and the grounding pole 202. The limiting portion 2041 is a groove on the magnetic part 204. The groove can be an arc-shaped groove or a rectangular groove, as long as the side wall of the groove can be used to form a limiting constraint effect with the first limiting end 2021 and the second limiting end 2011.

[0056] As an alternative embodiment, in the limiting portion 2041 of the magnetic part 204 in the embodiment of the present application, a protrusion is constructed on the inner surface corresponding to the contact between the first limiting end 2021 and the second limiting end 2011, and a uniform groove is constructed on the outer wall of the limiting portion 2041 corresponding to the contact between the first limiting end 2021 and the second limiting end 2011. When the limiting portion 2041 on the magnetic part 204 is engaged to limit the first limiting end 2021 and the second limiting end 2011, the positioning constraints of the protrusion and the groove are utilized to avoid relative displacement of the magnetic part 204 due to external force impact, vibration and other factors, thereby ensuring the overall working stability of the internal components of the second shell 200.

[0057] It can also be seen from the above description that due to the design of the outward-expanded first limit end 2021 and the outward-expanded second limit end 2011, the cross-sectional area of the side of the connecting electrode 201 facing the electric heating element 203 is larger than the size of the electric heating element 203 itself, and the cross-sectional area of the side of the grounding electrode 202 facing the electric heating element 203 is larger than the size of the electric heating element 203 itself. This design facilitates the formation of clear heat source areas and general areas, so that the electric heating element 203 is used as the heat source area, and the connecting electrode 201 and the grounding electrode 202 are used as general areas.

[0058] In some embodiments, the magnetic member 204 includes a first magnet 2042 and a second magnet 2043 that are magnetically coupled to each other, and at least one of the first magnet 2042 and the second magnet 2043 forms a limiting portion 2041 .

[0059] like Figure 4 As shown, the first magnet 2042 and the second magnet 2043 are made of the same magnetic material. The first magnet 2042 and the second magnet 2043 can be symmetrical and of the same size, or asymmetrical and of different sizes. After the first magnet 2042 and the second magnet 2043 are docked, a complete annular magnetic member 204 is formed. The limiting portion 2041 of the magnetic member 204 is used to fix the connecting pole 201 and the grounding pole 202.

[0060] By splitting the magnetic part 204 into the first magnet 2042 and the second magnet 2043, it is convenient to assemble the magnetic part 204 to the circumference of the electric heating element 203, reducing the assembly interference of the magnetic part 204. At the same time, during assembly, the first magnet 2042 can be clamped on the connecting pole 201, the electric heating element 203 and the grounding pole 202 to form a pre-assembled fixation of the magnetic part 204 in the second shell 200, effectively reducing the assembly difficulty and improving the assembly efficiency.

[0061] like Figure 2 and Figure 3 As shown, in some embodiments, a protruding limiting boss 1011 is constructed on one side where the conductive electrode 101 is connected to the connecting electrode 201, and the adsorption member 102 is arranged circumferentially around the limiting boss 1011; at least a portion of the connecting electrode 201 protrudes from the second shell 200, and the protruding portion of the connecting electrode 201 is engaged and connected with the limiting boss 1011.

[0062] Here, the adsorption component 102 can be made of a material that is subject to magnetic adsorption, such as iron sheet metal or a magnet. The adsorption component 102 uses a ring-shaped sheet material. On the one hand, it can increase the adsorption area with the magnetic component 204 and enhance the adsorption force. On the other hand, it can be fixed in the first shell 100 using the limiting boss 1011 to avoid the adsorption component 102 occupying too much space.

[0063] In the above embodiment, a limiting boss 1011 is designed, and the connecting pole 201 can be more easily plugged into the first shell 100 and conductively connected to the conductive pole 101, and the limiting boss 101 can limit and prevent the connecting pole 201 from shaking left and right, thereby enhancing the overall stability of the disconnector. The second shell 200 can only be separated from the first shell 100 when the magnetic part 204 is in a demagnetized state, thereby preventing the disconnector from being accidentally separated from the first shell 100 due to external vibration, wind and rain or impact.

[0064] Furthermore, in some embodiments, a seal is embedded between the connecting electrode 201 and the second shell 200 ; and / or a seal is embedded between the grounding electrode 202 and the second shell 200 .

[0065] As an alternative embodiment, the conductive electrode 101 has a protruding portion relative to the second housing 200, and the grounding electrode 202 has a protruding portion relative to the second housing 200. A concave annular groove is formed on the contact wall between the conductive electrode 101 and the second housing 200. A rubber sealing ring is used as a seal, which is interference-fitted and fixed in the annular groove. Similarly, a concave annular groove is formed on the contact wall between the grounding electrode 202 and the second housing 200. A rubber sealing ring is used as a seal, which is interference-fitted and fixed in the annular groove. Thus, the seal completely seals the second housing 200, preventing external impurities such as dust and rainwater from entering the second housing 200 and affecting the normal operation of the disconnector.

[0066] Of course, in some embodiments, the seal can be omitted, and an annular protrusion can be directly constructed on the corresponding side wall surface of the connecting electrode 201 or the grounding electrode 202. The annular protrusion and the second shell 200 form a labyrinth seal to enhance the overall sealing effect of the second shell 200.

[0067] In some embodiments, an elastic member is connected to the side end where the first shell 100 abuts the second shell 200, and the elastic member abuts the second shell 200. The elastic member has an elastic force that drives the second shell 200 away from the first shell 100; in the magnetic state, the magnetic adsorption force of the magnetic member 204 is greater than the elastic force of the elastic member, and in the demagnetized state, the magnetic adsorption force of the magnetic member 204 is less than the elastic force of the elastic member.

[0068] The elastic member in the above embodiment can adopt a compression spring with a certain elasticity, one end of which is fixedly connected to the first shell 100, and the other end is movably abutted against the second shell 200. The magnetic member 204 is in a magnetic state, and the magnetic member 204 and the adsorption member 102 overcome the elastic force of the elastic member and are adsorbed and connected, so that the first shell 100 and the second shell 200 are connected. The lightning arrester body generates a fault current. When the electric heating element 203 heats up, as the temperature of the electric heating element 203 rises, it is transmitted to the magnetic member 204, causing the magnetism of the magnetic member 204 to weaken. The magnetic adsorption force is less than the elastic force of the elastic member, and the elastic member pushes the second shell 200 to separate from the first shell 100, thereby realizing the separation of the disconnector.

[0069] Here, the elastic member can be provided on the circumferential outer wall of the first housing 100, or a groove can be cut in the end faces of the side walls of the first housing 100 and the second housing 200 where they abut against each other, and the elastic member can be installed in the groove. The number of elastic members can be one or more, which will be described in detail in the embodiments of this application.

[0070] When the magnetic member 204 is in a demagnetized state, the elastic member can assist in pushing the second shell 200, allowing the second shell 200 to detach from the first shell 100 more quickly, thereby improving the responsiveness and accuracy of the disconnector. On the other hand, in some complex installation scenarios of the lightning arrester, the disconnector may be in a horizontal assembly position due to factors such as the installation space and the position of the components. In the horizontal assembly position, the second shell 200 cannot actively detach from the first shell 100 due to gravity. The provision of the elastic member can assist the second shell 200 in detaching from the first shell 100, thereby disconnecting the conductive electrode 101 and the connecting electrode 201. Therefore, by providing the elastic member, the disconnector of the embodiment of the present application can be adapted to various installation scenarios, especially for scenarios where the disconnector is placed horizontally.

[0071] In some embodiments, an insulating filler is disposed in the second shell 200 , and the filler encapsulates the connecting electrode 201 , the grounding electrode 202 , the magnetic component 204 and the electric heating element 203 in the second shell 200 .

[0072] The second housing 200 can be constructed by joining two half-shells to facilitate the assembly of internal components such as the magnetic component 204 and the electric heating element 203. For example, the filler can be made of nylon or resin. After the connecting electrode 201, the grounding electrode 202, the magnetic component 204, and the electric heating element 203 are assembled, the second housing 200 is snapped together. The filler is then poured into the second housing 200 to form a complete package. This pouring of the filler further enhances the overall stability of the second housing 200, preventing the internal components of the second housing 200 from shaking and affecting the electrical conductivity.

[0073] It should be noted that in the embodiment of the present application, the connecting electrode 201, the grounding electrode 202, and the conductive electrode 101 are all made of a normally conductive wire material. The electric heating element 203 is required to be made of a material with high resistivity, high temperature resistance, and rapid thermal response, such as a nickel-chromium alloy, a molybdenum-tungsten alloy, or a positive temperature coefficient (PTC) ceramic material. Furthermore, the electric heating element 203 is shaped like a rectangular block or an ellipse to facilitate rapid heat generation and transfer to the magnetic element 204 when subjected to the arrester's fault current.

[0074] Furthermore, from the center of the electric heating element 203 toward the outside, the current density outside the electric heating element 203 is greater than the current density inside the electric heating element 203. As a result, the actual heating area of the electric heating element 203 tends to be toward the outside. Heat generated on the outside can increase the heat transfer rate from the electric heating element 203 to the magnetic element 204, allowing the magnetic element 204 to receive heat from the electric heating element 203 more quickly, thereby improving the overall thermal response speed of the disconnector.

[0075] In addition, the above-mentioned magnetic component 204 needs to be made of a magnetic material that loses magnetism at high temperatures and restores magnetism at medium and low temperatures. For example, a Curie temperature-sensitive material is used. The initial magnetic permeability of the magnetic component 204 needs to be high enough to meet the requirements of the reliable connection and adsorption of the second shell 200 and the first shell 100. In addition, the Curie temperature of the magnetic component 204 is slightly higher than the maximum temperature rise of the electric heating element 203 when the disconnector is operating normally, but lower than the limit temperature of the electric heating element 203 when the disconnector receives a fault current. For example, if the fault current causes the electric heating element 203 to heat up to 180°C, the Curie temperature selection condition of the magnetic component 204 is 170°C to 190°C, ensuring that the magnetic component 204 can reliably lose magnetism when the lightning arrester fails, causing the disconnector to detach. Here, the selection of the magnetic component 204 can be adjusted according to the material of the electric heating element 203, and is not absolutely limited in the embodiments of this application.

[0076] An exemplary use process of the detachable disconnector according to an embodiment of the present application is as follows:

[0077] The first shell 100 of the detachable disconnector is fixedly connected to the arrester body, so that the conductive electrode 101 is connected to the line side of the arrester body for electrical conduction; the connecting pole 201 of the second shell 200 is inserted into the limiting boss 1011 of the first shell 100. At this time, the magnetic part 204 and the adsorption part 102 are magnetically adsorbed, so that the first shell 100 and the second shell 200 form an adsorption connection, and the connecting pole 201 is connected to the conductive electrode 101 for electrical conduction.

[0078] A lightning arrester failure causes a current short circuit. The fault current passes through the electric heating element 203, causing the electric heating element 203 to heat up rapidly. The heat of the electric heating element 203 is transferred to the magnetic component 204. The magnetism of the magnetic component 204 gradually weakens as the temperature rises, and eventually it is in a demagnetized state. The weakening of the magnetism of the magnetic component 204 causes the second shell 200 to be unable to continue to maintain connection with the first shell 100. The second shell 200 is separated from the first shell 100, and the disconnector is separated and disconnects the lightning arrester.

[0079] After the staff inspects and replaces the faulty lightning arrester, they can simply reconnect the second housing 200 with the first housing 100 .

[0080] An embodiment of the present application further provides a lightning arrester, comprising a lightning arrester body and a detachable disconnector according to any one of the above embodiments connected to the lightning arrester body.

[0081] Since the lightning arrester includes a detachable disconnector in any of the above embodiments, it has all the advantages of a detachable disconnector. Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in this application. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the following claims.

[0082] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A detachable disconnector, characterized in that: include: A first shell (100) is provided with a conductive electrode (101) and an adsorption member (102) therein, wherein the conductive electrode (101) is used to be connected to the line side of the arrester; A second shell (200) is in contact with the first shell (100), and a connecting pole (201), a grounding pole (202), an electric heating element (203), and a magnetic element (204) are provided in the second shell (200); The grounding electrode (202) is used to connect to the grounding side of the lightning arrester; the electric heating element (203) connects the connection electrode (201) and the grounding electrode (202), and is configured to generate heat due to the fault current of the lightning arrester; the magnetic element (204) is arranged around the circumference of the electric heating element (203), and the magnetic element (204) has a magnetic state and a demagnetized state in which the magnetism is lost due to receiving heat from the electric heating element (203); The magnetic member (204) is configured with a limiting portion (2041) on one side facing the electric heating member (203), and the limiting portion (2041) surrounds at least a portion of the connecting electrode (201) and at least a portion of the grounding electrode (202) to limit the connecting electrode (201) and the grounding electrode (202) from being separated from the second shell (200), and the electric heating member (203) is sandwiched between the connecting electrode (201) and the grounding electrode (202); In the magnetic state, the magnetic member (204) is magnetically connected to the adsorption member (102), so that the conductive electrode (101) is connected to the connecting electrode (201); in the demagnetized state, the magnetic member (204) is disconnected from the adsorption member (102), so that the conductive electrode (101) is disconnected from the connecting electrode (201); A slot is provided on the side of the connecting electrode (201) facing the electric heating element (203), and a slot is provided on the side of the grounding electrode (202) facing the electric heating element (203), and the electric heating element (203) is embedded in the slots of the connecting electrode (201) and the grounding electrode (202); An elastic member is connected to the side ends of the first shell (100) and the second shell (200) that abut against each other, and the elastic member abuts against the second shell (200). The elastic member has an elastic force that drives the second shell (200) away from the first shell (100); In the magnetic state, the magnetic adsorption force of the magnetic part (204) is greater than the elastic force of the elastic part, and in the demagnetized state, the magnetic adsorption force of the magnetic part (204) is less than the elastic force of the elastic part.

2. The detachable disconnector according to claim 1, characterized in that: The magnetic member (204) comprises a first magnet (2042) and a second magnet (2043) that are magnetically connected, and at least one of the first magnet (2042) and the second magnet (2043) is configured with the limiting portion (2041).

3. The detachable disconnector according to claim 2, characterized in that: Along the current direction of the connecting electrode (201), the end of the connecting electrode (201) toward the electric heating element (203) gradually expands outward to form a first limiting end (2021), and the end of the grounding electrode (202) toward the electric heating element (203) gradually expands outward to form a second limiting end (2011); The limiting portion (2041) is a groove provided on the magnetic component (204), the opening direction of the groove is toward the electric heating component (203), and the groove is jointly clamped with the first limiting end (2021) and the second limiting end (2011).

4. The detachable disconnector according to claim 3, characterized in that: The first magnet (2042) and the second magnet (2043) are both configured with a limiting portion (2041).

5. The detachable disconnector according to claim 1, characterized in that: A protruding limiting boss (1011) is constructed on one side of the conductive electrode (101) connected to the connecting electrode (201), and the adsorption member (102) is arranged circumferentially around the limiting boss (1011); At least a portion of the connecting pole (201) protrudes from the second shell (200), and the protruding portion of the connecting pole (201) is engaged and connected with the limiting boss (1011).

6. The detachable disconnector according to claim 5, characterized in that: A sealing member is embedded between the connecting electrode (201) and the second shell (200); and / or a sealing member is embedded between the grounding electrode (202) and the second shell (200).

7. The detachable disconnector according to any one of claims 1 to 6, characterized in that: In a direction from the center of the electric heating element (203) to the outside, the current density outside the electric heating element (203) is greater than the current density inside the electric heating element (203).

8. The detachable disconnector according to any one of claims 1 to 6, characterized in that: An insulating filler is provided in the second shell (200), and the filler encapsulates the connecting pole (201), the grounding pole (202), the magnetic component (204) and the electric heating component (203) into the second shell (200).

9. A lightning arrester, characterized in that: The invention comprises a lightning arrester body and a detachable disconnector according to any one of claims 1 to 8 connected to the lightning arrester body.

Images