Separable disconnector and lightning arrester

Abstract

The invention provides a separable disconnector and a lightning arrester, and belongs to the technical field of lightning arresters. Wherein the separable disconnector comprises a first shell and a second shell, the first shell is internally provided with a conductive electrode and an adsorption piece, and the conductive electrode is used for being connected with the line side of the lightning arrester; the second shell abuts against the first shell, and a connecting electrode, a grounding electrode, an electric heating piece and a magnetic piece are arranged in the second shell; the grounding electrode is used for being connected with the grounding side of the lightning arrester; the electric heating element is connected with the connecting electrode and the grounding electrode, and is configured to generate heat due to fault current of the lightning arrester; the magnetic part is arranged around the peripheral side of the electric heating part, and the magnetic part has a magnetic state and an excitation loss state for receiving heat of the electric heating part to lose magnetism. The separable disconnector provided by the embodiment of the invention can be repeatedly used for multiple times, and is beneficial to reducing the maintenance cost.

Description

Technical Field

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

[0002] A disconnector is a component used in cooperation with a lightning arrester. The main function of the disconnector is that when a breakdown or other faults occur in the lightning arrester, the disconnector is actuated to disconnect the circuit by using the power frequency short-circuit current flowing through the lightning arrester, so that the grounding end of the lightning arrester is automatically disconnected, and the lightning arrester exits the system operation, facilitating maintenance personnel to timely detect the fault point for maintenance and replacement.

[0003] In the related art, the disconnector is generally a disposable component. After a breakdown fault occurs in the lightning arrester, 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 synchronously, resulting in a high usage cost of the disconnector. Summary of the Invention

[0004] The present application provides a separable disconnector and a lightning arrester to solve the technical problem of high cost caused by the disconnector being a disposable product in the related art.

[0005] On the one hand, the present application provides a separable disconnector, including:

[0006] A first housing, internally provided with a conducting electrode and an attracting member, the conducting electrode being used for connecting to the line side of the lightning arrester;

[0007] A second housing, in contact with the first housing, the second housing internally provided with a connecting electrode, a grounding electrode, an electric heating element, and a magnetic member; the grounding electrode is used for connecting 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 member is arranged around the periphery of the electric heating element, and the magnetic member has a magnetic state and a demagnetized state in which it loses magnetism due to receiving the heat of the electric heating element;

[0008] A limiting portion is formed on the side of the magnetic member facing the electric heating element, and the limiting portion wraps at least part of the connecting electrode and at least part of the grounding electrode to limit the connecting electrode and the grounding electrode from detaching from the second housing, and the electric heating element is clamped between the connecting electrode and the grounding electrode;

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

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

[0011] In some possible embodiments, along the current direction of the connection pole, the end of the connection pole facing the electric heating element gradually expands outward into a first limiting end, and the end of the grounding pole facing the electric heating element gradually expands outward into a second limiting end;

[0012] The limiting portion is a groove provided on the magnetic member, the opening direction of the groove faces the electric heating element, and the grooves jointly clamp the first limiting end and the second limiting end.

[0013] In some possible embodiments, both the first magnet and the second magnet are configured with one of the limiting portions.

[0014] In some possible embodiments, a protruding limiting boss is configured on the side of the conducting electrode connected to the connection pole, and the adsorbing member is arranged circumferentially around the limiting boss;

[0015] At least a part of the connection pole protrudes from the second housing, and the protruding part of the connection pole is fitted and connected with the limiting boss.

[0016] In some possible embodiments, a sealing member is embedded between the connection pole and the second housing; and / or, a sealing member is embedded between the grounding pole and the second housing.

[0017] In some possible embodiments, an elastic member is connected to the side end of the first housing in contact with the second housing, the elastic member is in contact with the second housing, and the elastic member has an elastic acting force for driving the second housing away from the first housing;

[0018] In the magnetic state, the magnetic adsorption force of the magnetic member is greater than the elastic acting force of the elastic member, and in the demagnetized state, the magnetic adsorption force of the magnetic member is less than the elastic acting force of the elastic member.

[0019] In some possible embodiments, 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 embodiments, an insulating filler is provided in the second housing, and the filler encapsulates the connection pole, the grounding pole, the magnetic member and the electric heating element in the second housing.

[0021] On the other hand, the present application provides a lightning arrester, which includes a lightning arrester body and the separable disconnector described in any one of the above connected to the lightning arrester body.

[0022] In the separable disconnector and the lightning arrester provided by the present application, in the separable disconnector, it is divided into a first housing and a second housing, and components are all integrally installed in the housing. When the magnetic part loses its magnetism when reaching the critical temperature after being heated by the electric heating part, but the magnetism will automatically recover after cooling. Thus, after the trouble of the lightning arrester is eliminated, only the separated first housing and the second housing need to be reconnected to restore the normal function, without replacing the magnetic part or the electric heating part, and there is no physical damage, which is beneficial to reducing the maintenance cost.

[0023] In addition, during the detection and factory stage of the disconnector, multiple high-temperature demagnetization tests can be carried out to use the function, and it can be used normally after the test. Compared with the disconnector with a destructive disconnection action in the related art, it can more accurately test the use effect of the disconnector, reduce the waste of detection tests, and is beneficial to ensuring the product yield. Description of the Drawings

[0024] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0025] Figure 1 It is a schematic diagram of the overall structure of the separable disconnector in the embodiment of the present application;

[0026] Figure 2 is Figure 1 a schematic diagram of the structure of the first housing in

[0027] Figure 3 is Figure 1 a schematic diagram of the structure of the second housing in

[0028] Figure 4 is a schematic diagram of the structure of the magnetic part in the embodiment of the present application.

[0029] Description of the Reference Numerals

[0030] 100. First housing; 101. Conductive electrode; 1011. Limiting boss; 102. Adsorbing part;

[0031] 200. Second housing; 201. Connecting electrode; 2011. Second limiting end; 202. Grounding electrode; 2021. First limiting end; 203. Electric heating part;

[0032] 204. Magnetic part; 2041. Limiting part; 2042. First magnet; 2043. Second magnet.

[0033] Through the above-mentioned accompanying drawings, specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by reference to specific embodiments. Detailed Description of the Embodiments

[0034] To make the objectives, 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 with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" shall be construed broadly. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0037] The terms "first", "second", "third", "fourth", etc. in the specification, claims, and above-mentioned drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0038] In addition, the terms "comprising", "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] As described in the background art, in a power system, a lightning arrester is a key device for protecting power transmission and transformation equipment from lightning overvoltage or switching overvoltage damage. When a lightning arrester fails due to aging, insulation deterioration or external impact, its interior may overheat due to continuous power frequency leakage current or short-circuit current, and even cause serious accidents such as explosion and fire.

[0040] To timely isolate a faulty lightning arrester and prevent the accident from expanding, a disconnector is widely deployed in the grounding circuit of the lightning arrester 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 generally include thermal explosion type disconnectors, thermal melting type disconnectors, etc. Specifically, when a short-circuit fault occurs in a lightning arrester, power frequency short-circuit current will flow through the thermal explosion type disconnector. The current causes the thermistor to heat up, and the thermal explosion element in contact with it explodes and sprays (similar to the principle of a bullet). The explosion spray causes the weak point of the outer shell to rupture, and part of the grounding bolt falls off, so that the faulty lightning arrester is taken out of system operation. The thermal melting type disconnector with a similar principle uses the power frequency short-circuit current flowing through the failed lightning arrester to melt the alloy fuse piece in the disconnector, and uses the elastic force of the spring to separate the upper and lower parts of the disconnector, ultimately achieving the purpose of disconnection.

[0042] The above two types of disconnectors are both one-time destructive disconnection actions. After the lightning arrester is repaired, a new disconnector needs to be replaced for use, resulting in a relatively high cost of the disconnector; in addition, each replacement of the disconnector also involves the connection of the specific circuit between the lightning arrester and the disconnector, resulting in greater difficulty and time consumption in the repair of the lightning arrester.

[0043] Based on the above description of related technologies, the embodiments of the present application provide a separable disconnector and a lightning arrester. The separable disconnector specifically includes a first housing and a second housing. Components are integrally installed in each housing. The magnetic part loses its magnetism when it reaches the critical temperature after being heated by the electric heating part, but its magnetism will automatically recover after cooling. Thus, after the fault of the lightning arrester is eliminated, the disconnector only needs to reconnect the separated first housing and second housing to restore normal function, without replacing the magnetic part or the electric heating part, and there is no physical damage, which is beneficial to reducing the maintenance cost.

[0044] The separable disconnector of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] As shown Figure 1 in the figure, an embodiment of the present application provides a separable disconnector, which includes a first housing 100 and a second housing 200 that are in contact with each other.

[0046] Among them, a conducting electrode 101 and an adsorbing member 102 are provided inside the first housing 100. The conducting 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 member 204 are provided inside the second housing 200; the grounding electrode 202 is used to connect to the grounding side of the lightning arrester; the electric heating element 203 connects 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 member 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 formed on one side of the magnetic member 204 facing the electric heating element 203. The limiting portion 2041 wraps at least part of the connecting electrode 201 and at least part of the grounding electrode 202 to limit the connecting electrode 201 and the grounding electrode 202 from detaching from the second housing 200, and the electric heating element 203 is clamped between the connecting electrode 201 and the grounding electrode 202.

[0048] The magnetic member 204 has a magnetic state and a demagnetized state in which it loses magnetism due to receiving the heat of the electric heating element 203; in the magnetic state, the magnetic member 204 is magnetically connected to the adsorbing member 102 so that the conducting electrode 101 is connected to the connecting electrode 201; in the demagnetized state, the magnetic member 204 is disconnected from the adsorbing member 102 so that the conducting electrode 101 is disconnected from the connecting electrode 201.

[0049] In the above solution, the first housing 100 and the second housing 200 are connected only by the magnetic adsorption of the magnetic member 204 and the adsorbing member 102. Since the magnetic member 204 is heated and switched to the demagnetized state, the second housing 200 will be separated from the first housing 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 overhaul, since the magnetic member 204 is no longer heated and returns to the magnetic state, the first housing 100 and the second housing 200 can be connected again without disassembling or modifying the internal components of the disconnector, effectively reducing the overhaul difficulty and lowering the use cost of the disconnector product.

[0050] In the embodiments of the present application, the first housing 100 and the second housing 200 are made of high-temperature resistant insulating materials, such as engineering plastics, ceramic matrix composites, etc. Exemplarily, the first housing 100 is an integrally cast plastic housing as a whole. The conducting electrode 101 is fixed in the first housing 100, and the adsorbing member 102 is arranged on one side of the first housing 100 for abutting against the second housing 200, so as to enhance the adsorption effect between the adsorbing member 102 and the magnetic member 204. The conducting 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 grounding side of the arrester body.

[0051] Here, generally, the disconnector is vertically connected to the arrester body, that is, the first housing 100 itself is in a fixed state. The magnetic member 204 in the magnetic state is magnetically connected to the adsorbing member 102, so that the second housing 200 is adsorbed on the first housing 100. When the magnetic member 204 is in a demagnetized state, the gravity of the second housing 200 itself is greater than the magnetic adsorption force, and the second housing 200 falls off the first housing 100, so that the disconnector is disengaged.

[0052] As Figure 3 shown, in some embodiments, a card slot is provided on one side of the connecting electrode 201 facing the electric heating element 203, and a card slot is also provided on one side of the grounding electrode 202 facing the electric heating element 203. The size of the card slot matches the size of the electric heating element 203. When the disconnector is in a normal working state, a current path of the conducting electrode 101 - connecting electrode 201 - electric heating element 203 - grounding electrode 202 is formed. The electric heating element 203 is fitted and clamped into the card slots of the connecting electrode 201 and the grounding electrode 202, so as to further improve the conductive effect between the electric heating element 203 and the connecting electrode 201, and between the electric heating element 203 and the grounding electrode 202.

[0053] Since the connecting electrode 201 and the grounding electrode 202 clamp the electric heating element 203, the fault current of the arrester is forced to flow through the electric heating element 203, and no other circuit losses will occur. In addition, the provided card slot can also facilitate the pre-assembly and fixation of the electric heating element 203 between the connecting electrode 201 and the grounding electrode 202, which is beneficial to improving the disassembly and assembly efficiency. Further, silver is plated or thermal conductive silicone grease is coated on the circumferential side surface of the electric heating element 203, thereby further improving the heat transfer effect and ensuring efficient heat transfer to the magnetic member 204.

[0054] In some embodiments, along the current direction of the connecting electrode 201, the end of the connecting electrode 201 facing the electric heating element 203 gradually expands outward into a first limiting end 2021, and the end of the grounding electrode 202 facing the electric heating element 203 gradually expands outward into a second limiting end 2011; the limiting portion 2041 is a groove provided on the magnetic member 204, and the opening direction of the groove faces the electric heating element 203. The groove commonly clamps the first limiting end 2021 and the second limiting end 2011.

[0055] In the above embodiments, the first limiting end 2021 and the second limiting end 2011 are designed to expand outwards, increasing 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 member 204. The groove can be an arc-shaped groove or a rectangular groove, as long as the side walls of the groove can form a limiting and constraining 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 member 204 in the embodiments of the present application, bumps are formed on the inner side surface corresponding to the contact between the first limiting end 2021 and the second limiting end 2011, and uniform grooves are formed on the outer side walls of the first limiting end 2021 and the second limiting end 2011 corresponding to the contact with the limiting portion 2041. When the limiting portion 2041 on the magnetic member 204 is clamped and limited to the first limiting end 2021 and the second limiting end 2011, the positioning constraints of the bumps and the grooves are utilized to prevent the magnetic member 204 from undergoing relative displacement due to external force impacts, vibrations and other factors, ensuring the overall stable operation of the components inside the second housing 200.

[0057] It can also be seen from the above description that due to the design of the outward-expanded first limiting end 2021 and the outward-expanded second limiting end 2011, the cross-sectional area of the connecting pole 201 on the side 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 grounding pole 202 on the side facing the electric heating element 203 is larger than the size of the electric heating element 203 itself. This design facilitates the formation of a clear heat source area and a common area, with the electric heating element 203 serving as the heat source area and the connecting pole 201 and the grounding pole 202 serving as the common area.

[0058] In some embodiments, the magnetic member 204 includes a first magnet 2042 and a second magnet 2043 that are magnetically docked, and at least one of the first magnet 2042 and the second magnet 2043 is configured with a limiting portion 2041.

[0059] As Figure 4 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 have the same symmetrical size or different asymmetrical sizes. After the first magnet 2042 and the second magnet 2043 are docked, a complete ring-shaped magnetic member 204 is formed, and the connecting pole 201 and the grounding pole 202 are fixed by the limiting portion 2041 of the magnetic member 204.

[0060] By splitting the magnetic component 204 into the first magnet 2042 and the second magnet 2043, it is possible to facilitate the assembly of the magnetic component 204 to the circumference of the electric heating component 203, reducing the assembly interference of the magnetic component 204. At the same time, during assembly, the first magnet 2042 can be clamped on the connecting pole 201, the electric heating component 203 and the grounding pole 202 to form a pre-assembled fixation of the magnetic component 204 in the second shell 200, effectively reducing the difficulty of assembly and improving 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 subjected to magnetic adsorption, such as iron sheet metal or a magnet. The adsorption component 102 is made of annular 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 by 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 block 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 shell 200, and the grounding electrode 202 has a protruding portion relative to the second shell 200. A concave annular groove is constructed on the contact wall between the conductive electrode 101 and the second shell 200. The sealing member adopts a rubber sealing ring and is fixed in the annular groove by interference filling. Similarly, a concave annular groove is constructed on the contact wall between the grounding electrode 202 and the second shell 200. The sealing member adopts a rubber sealing ring and is fixed in the annular groove by interference filling. Thus, the second shell 200 is sealed as a whole by the sealing member to prevent external impurities such as dust and rain from entering the second shell 200 and affecting the normal operation of the disconnector.

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

[0067] In some embodiments, an elastic member is connected to the side end of the first housing 100 in contact with the second housing 200. The elastic member is in contact with the second housing 200 and has an elastic force for driving the second housing 200 away from the first housing 100. In the magnetic state, the magnetic adsorption force of the magnetic member 204 is greater than the elastic force of the elastic member. 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 embodiments may be a compression spring with a certain elasticity. One end of the compression spring is fixedly connected to the first housing 100, and the other end is movably in contact with the second housing 200. When the magnetic member 204 is in the magnetic state, the magnetic member 204 and the adsorbent 102 are adsorbed and connected against the elastic force of the elastic member, so that the first housing 100 and the second housing 200 are connected. When a fault current occurs in the arrester body and the electric heating element 203 generates heat, 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 housing 200 away from the first housing 100 to achieve the disconnection of the disconnector.

[0069] Here, the elastic member may be disposed on the circumferential outer side wall of the first housing 100. Alternatively, grooves are formed on the side wall end faces of the first housing 100 and the second housing 200 in contact with each other, and the elastic member is installed in the grooves. The number of elastic members may be one or more, which will not be elaborated in the embodiments of the present application.

[0070] When the magnetic member 204 is in the demagnetized state, the elastic member can assist in pushing the second housing 200, so that the second housing 200 can be disconnected from the first housing 100 faster, improving the response and accuracy of the disconnector. On the other hand, in some complex installation scenarios of the arrester, the disconnector may be in a horizontal assembly position due to factors such as installation space and component position. In the horizontal assembly position, the second housing 200 cannot be actively disconnected from the first housing 100 due to gravity. Setting the elastic member can assist the second housing 200 to disconnect from the first housing 100, thereby disconnecting the connection between the conducting electrode 101 and the connection electrode 201. Therefore, by setting the elastic member, the disconnector in the embodiments of the present application can be adapted to various different installation scenarios, especially for the scenario where the disconnector is placed horizontally.

[0071] In some embodiments, an insulating filler is disposed within the second housing 200, and the filler encapsulates the connection electrode 201, the grounding electrode 202, the magnetic member 204, and the electric heating element 203 within the second housing 200.

[0072] The second housing 200 can be formed by docking two half-shells to facilitate the assembly of internal components such as the magnetic member 204 and the electric heating element 203. Exemplarily, the filler can be made of nylon or resin material. After the connection electrode 201, the grounding electrode 202, the magnetic member 204, and the electric heating element 203 are assembled, the second housing 200 is integrally snapped together, and the filler is poured into the second housing 200 to form an integral encapsulated structure. By pouring the filler, the overall stability of the second housing 200 can be further improved, and the shaking of the internal components of the second housing 200 can be avoided from affecting the conductive effect.

[0073] It should be noted that in the embodiments of the present application, the connection electrode 201, the grounding electrode 202, and the conducting electrode 101 are all made of normally conductive wire materials. The electric heating element 203 needs to be made of materials with high resistivity, high temperature resistance, and rapid thermal response, such as nickel-chromium alloy, molybdenum-tungsten alloy, positive temperature coefficient (PTC) ceramic materials, etc. Further, the shape of the electric heating element 203 is rectangular block or elliptical to facilitate rapid heat generation and transfer to the magnetic member 204 when the fault current of the arrester is received.

[0074] Further, along the 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. Thus, the actual heating area of the electric heating element 203 tends to be on the outside, and the outside heating can improve the heat conduction speed of the electric heating element 203 to the magnetic member 204, enabling the magnetic member 204 to receive the heat of the electric heating element 203 faster and improving the overall thermal response speed of the disconnector.

[0075] In addition, the above-mentioned magnetic member 204 needs to be made of a magnetic material that loses magnetism at high temperatures and recovers magnetism at medium and low temperatures. Exemplarily, a Curie temperature sensitive material is used. The initial magnetic permeability of the magnetic member 204 needs to be high enough to satisfy the firm connection and adsorption between the second housing 200 and the first housing 100. In addition, the Curie temperature of the magnetic member 204 is slightly higher than the maximum temperature rise of the electric heating element 203 during the normal operation of the disconnector, but lower than the limit temperature of the electric heating element 203 when the disconnector receives the fault current. For example, if the fault current causes the electric heating element 203 to heat up to 180°C, the selection condition for the Curie temperature of the magnetic member 204 is 170°C to 190°C to ensure reliable demagnetization of the magnetic member 204 when the arrester fails and the disconnector is disengaged. Here, the selection of the magnetic member 204 can be adjusted according to the material of the electric heating element 203, and no absolute limitation is made in the embodiments of the present application.

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

[0077] Fix the first housing 100 of the separable disconnector to the arrester body so that the conducting electrode 101 is electrically connected to the line side of the arrester body; insert the connection pole 201 of the second housing 200 into the limit boss 1011 of the first housing 100. At this time, the magnetic member 204 and the adsorbing member 102 are magnetically adsorbed, so that the first housing 100 and the second housing 200 form an adsorption connection, and the connection pole 201 is electrically connected to the conducting electrode 101.

[0078] When a fault occurs in the arrester, resulting in a current short circuit, the fault current passes through the electric heating element 203, causing the electric heating element 203 to rapidly heat up. The heat of the electric heating element 203 is transferred to the magnetic member 204. As the temperature of the magnetic member 204 increases, its magnetism gradually weakens and finally it is in a demagnetized state. The weakening of the magnetism of the magnetic member 204 causes the second housing 200 to be unable to continue to be connected to the first housing 100, and the second housing 200 is separated from the first housing 100, and the disconnector is separated and disconnected from the arrester.

[0079] After the staff repairs and replaces the faulty arrester, the second housing 200 can be reinserted into the first housing 100.

[0080] An embodiment of the present application also provides an arrester, which includes an arrester body and the separable disconnector according to any one of the above embodiments connected to the arrester body.

[0081] Since the arrester includes the separable disconnector in any one of the above embodiments, it has all the advantages of the separable disconnector. Those skilled in the art will readily think of other implementation schemes of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

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

Claims

1. A separable disengager, characterized in that, Comprising: A first housing (100) with a conducting electrode (101) and an adsorbing member (102) disposed therein, and the conducting electrode (101) is used for connecting to the line side of the lightning arrester; A second housing (200) abutted against the first housing (100), and a connecting electrode (201), a grounding electrode (202), an electric heating element (203), and a magnetic member (204) are disposed in the second housing (200); The grounding electrode (202) is used for connecting to the grounding side of the lightning arrester; the electric heating element (203) connects 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 member (204) is arranged around the circumferential side of the electric heating element (203), and the magnetic member (204) has a magnetic state and a demagnetized state in which it loses magnetism due to receiving the heat of the electric heating element (203); A limiting portion (2041) is formed on one side of the magnetic member (204) facing the electric heating element (203), and the limiting portion (2041) wraps at least part of the connecting electrode (201) and at least part of the grounding electrode (202) to limit the connecting electrode (201) and the grounding electrode (202) from detaching from the second housing (200), and the electric heating element (203) is clamped between the connecting electrode (201) and the grounding electrode (202); In the magnetic state, the magnetic member (204) is magnetically connected to the adsorbing member (102) so that the conducting electrode (101) is connected to the connecting electrode (201); in the demagnetized state, the magnetic member (204) is disconnected from the adsorbing member (102) so that the conducting electrode (101) is disconnected from the connecting electrode (201).

2. The separable disengager according to claim 1, characterized in that, The magnetic member (204) includes a first magnet (2042) and a second magnet (2043) that are magnetically docked, and at least one of the first magnet (2042) and the second magnet (2043) is formed with the limiting portion (2041).

3. The separable disengager according to claim 2, characterized in that, Along the current direction of the connecting electrode (201), the end of the connecting electrode (201) facing the electric heating element (203) gradually expands outward into a first limiting end (2021), and the end of the grounding electrode (202) facing the electric heating element (203) gradually expands outward into a second limiting end (2011); The limiting portion (2041) is a groove provided on the magnetic member (204), and the opening direction of the groove faces the electric heating element (203), and the groove jointly clamps the first limiting end (2021) and the second limiting end (2011).

4. The separable disengager according to claim 3, characterized in that, Both the first magnet (2042) and the second magnet (2043) are formed with a limiting portion (2041).

5. The separable disengager according to claim 1, characterized in that, A protruding limiting boss (1011) is formed on the side of the conducting electrode (101) connected to the connecting electrode (201), and the adsorbing member (102) is arranged around the circumferential direction of the limiting boss (1011); At least a part of the connecting pole (201) protrudes from the second housing (200), and the protruding part of the connecting pole (201) is fitted and connected with the limiting boss (1011).

6. The separable disengager according to claim 5, characterized in that, A seal is embedded between the connecting pole (201) and the second housing (200); and / or, a seal is embedded between the grounding pole (202) and the second housing (200).

7. The separable disengager according to any one of claims 1 to 6, characterized in that, An elastic member is connected to the side end of the first housing (100) in contact with the second housing (200). The elastic member is in contact with the second housing (200), and the elastic member has an elastic acting force for driving the second housing (200) away from the first housing (100). In the magnetic state, the magnetic adsorption force of the magnetic member (204) is greater than the elastic acting force of the elastic member. In the demagnetized state, the magnetic adsorption force of the magnetic member (204) is less than the elastic acting force of the elastic member.

8. The separable disengager according to any one of claims 1 to 6, characterized in that, Along the 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).

9. The separable disengager according to any one of claims 1 to 6, characterized in that, An insulating filler is arranged in the second housing (200), and the filler encapsulates the connecting pole (201), the grounding pole (202), the magnetic member (204) and the electric heating element (203) into the second housing (200).

10. A lightning arrester, characterized in that, It includes a lightning arrester body and the separable disconnector according to any one of claims 1 to 9 connected to the lightning arrester body.

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