Three-phase combined type fault self-separation line lightning arrester
By using a three-phase combined fault-free line arrester with parallel discharge gaps and overcurrent protection mechanisms, the problems of high cost and difficult testing of arresters in high-voltage distribution lines are solved, achieving the effect of low cost and convenient maintenance.
Patent Information
- Application Number
- CN202423174445.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In existing high-voltage power distribution lines, each phase line needs to be equipped with a separate surge arrester, which results in high equipment costs and difficulty in detecting damage, affecting users' power experience.
A three-phase combined fault-disconnecting line arrester is adopted. By setting the discharge gap and overcurrent protection mechanism in parallel, the cost is reduced, and the arrester automatically disconnects when the mechanism fails, which facilitates detection and maintenance.
It reduces production and maintenance costs, enables convenient testing and maintenance of surge arresters, and improves the user's electricity experience.
Smart Images
Figure CN223624786U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high-voltage transmission lines, and more specifically, to a three-phase combined fault self-disconnecting line surge arrester. Background Technology
[0002] Overvoltages generated when high-voltage power distribution lines are struck by lightning can cause insulator flashover or breakdown, conductor breakage, and lightning surges may even travel along the distribution lines to substations, affecting their safe operation and potentially causing personal injury accidents. To mitigate the effects of overvoltages generated by lightning strikes, surge arresters with series discharge gaps are typically installed on high-voltage lines to release the overvoltages generated by lightning strikes, achieving overvoltage protection.
[0003] High-voltage power distribution lines consist of three phases. In existing technology, each phase is typically equipped with a separate surge arrester with a series discharge gap to eliminate overvoltage in that phase. However, commonly used surge arresters are prone to damage after releasing overvoltage and are considered consumable equipment. Therefore, installing a separate surge arrester for each phase increases the cost of equipment use and maintenance. In addition, it is difficult to identify whether a conventional surge arrester is damaged. If it is necessary to check whether a surge arrester is damaged, the power line must be de-energized and the surge arrester must be removed for inspection, which will affect the user's power experience. Utility Model Content
[0004] The present invention aims to overcome at least one of the defects of the prior art and provide a three-phase combined fault self-disconnecting line surge arrester to reduce production and use costs and facilitate detection.
[0005] The technical solution adopted by this utility model is as follows:
[0006] This utility model provides a three-phase combined fault self-disconnecting line arrester, the arrester including a discharge unit, a disconnecting overcurrent protection unit and a first insulation support unit;
[0007] The first insulating support unit includes a first end and a second end disposed opposite to each other;
[0008] The discharge unit includes three upper discharge electrode plates, three second insulating support units, and one lower discharge electrode plate. Each upper discharge electrode plate is provided with one upper discharge electrode. One end of each second insulating support unit is connected to one upper discharge electrode plate, and the other end is connected to the lower discharge electrode plate. One to three lower discharge electrodes are provided on the lower discharge electrode plate, and each lower discharge electrode corresponds to at least one upper discharge electrode to form a discharge gap. Each upper discharge electrode plate is connected to one phase of the high-voltage line, and the distance between any two upper discharge electrode plates is not less than a preset first discharge safety distance.
[0009] The first end of the first insulating support unit is fixedly connected to the discharge lower electrode plate;
[0010] One end of the disconnectable overcurrent protection unit is fixedly electrically connected to the discharge lower electrode plate, and the other end of the disconnectable overcurrent protection unit is fixedly electrically connected to the second end of the first insulating support unit. The disconnectable overcurrent protection unit includes an overcurrent protection mechanism. When the overcurrent protection mechanism fails, the overcurrent protection mechanism is disconnected from the disconnectable overcurrent protection unit.
[0011] By connecting each phase of the high-voltage line to a discharge upper electrode, and setting at least one discharge lower electrode corresponding to the discharge upper electrodes of the three phases as needed, and the discharge lower electrode being set on a discharge lower electrode plate, the discharge gaps formed by the three discharge upper electrodes are essentially connected in parallel. Finally, a discharge lower electrode plate is connected in series with an overcurrent protection mechanism. This eliminates the need to set up a discharge gap and an overcurrent protection mechanism in series for each phase of the high-voltage line, greatly saving production and maintenance costs. In addition, when the overcurrent protection mechanism fails, it can be disconnected through the disconnected overcurrent protection unit, allowing for direct observation that the overcurrent protection mechanism of the surge arrester has failed and needs to be replaced, thus facilitating the maintenance of the surge arrester.
[0012] Furthermore, both the upper discharge electrode and the lower discharge electrode are convex hemispherical or conical, and a discharge gap with a fixed distance is formed between the spherical surface of the upper discharge electrode and the tip of the cone of the corresponding lower discharge electrode.
[0013] By setting the upper discharge electrode and the lower discharge electrode to a hemispherical or conical shape, better discharge can be achieved between the upper discharge electrode and the lower discharge electrode.
[0014] Furthermore, the fixed distance forming the discharge gap is 45-85mm.
[0015] Preferably, one lower discharge electrode is provided on the lower discharge electrode plate, and the three upper discharge electrodes form the discharge gap with the lower discharge electrode.
[0016] Preferably, two discharge lower electrodes are provided on the discharge lower electrode plate, the distance between the two discharge lower electrodes is not less than a preset second discharge safety distance, the two discharge upper electrodes form the discharge gap with one discharge lower electrode respectively, and one discharge upper electrode forms the discharge gap with the other discharge lower electrode.
[0017] Preferably, three discharge electrodes are provided on the discharge lower electrode plate, and the distance between every two discharge lower electrodes is not less than a preset second discharge safety distance. The three discharge upper electrodes correspond to the three discharge lower electrodes to form the discharge gap.
[0018] Furthermore, the disconnectable overcurrent protection unit includes an elastic upper connection mechanism, a rotating lower connection mechanism, and the overcurrent protection mechanism. The elastic upper connection mechanism is fixedly electrically connected to the discharge lower electrode plate. The rotating lower connection mechanism is fixedly connected to the second end of the first insulating support unit. One end of the overcurrent protection mechanism is elastically electrically connected to the elastic upper connection mechanism, and the other end of the overcurrent protection mechanism is provided with a disconnector. The other end of the overcurrent protection mechanism is detachably and rotatably electrically connected to the rotating lower connection mechanism through the disconnector. When the overcurrent protection mechanism fails, the disconnector disengages from the overcurrent protection mechanism, causing the overcurrent protection mechanism to rotate relative to the end where the disconnector is located.
[0019] By providing an elastic upper connection mechanism and a rotating lower connection mechanism in the disconnectable overcurrent protection unit, and by making the overcurrent protection mechanism elastically electrically connected to the elastic upper connection mechanism and rotatably electrically connected to the rotating lower connection mechanism, the overcurrent protection mechanism can better achieve installation, fixation, ejection / removal in the disconnectable overcurrent protection unit.
[0020] Furthermore, the elastic upper connection mechanism includes an upper substrate and an electrical contact plate;
[0021] The upper substrate is fixedly electrically connected to the lower discharge electrode plate; the electrical contact plate is disposed below the upper substrate, the upper surface of one end of the electrical contact plate is fixedly electrically connected to the lower surface of the upper substrate, and the middle part of the other end of the electrical contact plate is bent downward to form a concave structure. The upper surface of the concave structure is elastically connected to the lower surface of the upper substrate through an elastic mechanism; a convex contact point is provided in the middle of the lower surface of the concave structure of the electrical contact plate, and the overcurrent protection mechanism and the elastic upper connection mechanism are elastically connected through the contact point to one end of the overcurrent protection mechanism.
[0022] The concave contact point can make good contact with the overcurrent protection mechanism, and the concave structure formed by the bending of the electrical contact plate and the action of the elastic mechanism can achieve the fixation and elastic electrical connection of the overcurrent protection mechanism.
[0023] Furthermore, the overcurrent protection mechanism includes a power-on contact, an overcurrent protector, an insulating connector, and a rotating electrical contact;
[0024] The power-on contact is located at one end of the overcurrent protector, and the overcurrent protection mechanism is elastically electrically connected to the elastic upper connection mechanism through the power-on contact;
[0025] The other end of the overcurrent protector is connected to one end of the disconnector; one end of the insulating connector is fixedly connected to the connection between the overcurrent protector and the disconnector, and the other end is rotatably connected to the rotating electrical contact.
[0026] The other end of the disconnector is fixedly electrically connected to the rotating electrical contact.
[0027] The rotating lower connection mechanism includes a concave plate and a fixed plate fixedly connected to the second end of the first insulating support unit. The concave portion of the concave plate is fixedly connected to the fixed plate, and hook structures are respectively provided at the ends of both sides of the concave plate. The rotating electrical contact is disposed in the groove of the concave plate, and rotating shafts are provided on both sides of the rotating electrical contact. The rotating shafts and hook structures enable a detachable rotating electrical connection between the rotating electrical contact and the rotating lower connection mechanism.
[0028] The hook structure facilitates the disassembly and installation of the overcurrent protection mechanism. The rotating shaft of the rotating electrical contact and the hook structure allow the overcurrent protection mechanism to rotate relative to the rotating lower connection mechanism. When the overcurrent protection mechanism fails, the disconnector disengages, and the insulating connector loses its support and rotates relative to the rotating electrical contact, causing the overcurrent protection mechanism to disengage from the elastic upper connection mechanism. This, in turn, causes the overcurrent protection mechanism to rotate relative to the rotating lower connection mechanism, indicating that the overcurrent protection mechanism has failed. The status of the surge arrester's overcurrent protection mechanism can be visually observed to determine if the surge arrester has failed and requires replacement, facilitating maintenance. Furthermore, the overcurrent protection mechanism is electrically connected to the rotating lower connection mechanism via the hook structure and to the elastic upper connection mechanism via a flexible electrical connection, allowing for convenient, uninterrupted replacement of the overcurrent protection mechanism via a specially designed operating ring.
[0029] Furthermore, the elastic upper connection mechanism also includes a U-shaped limiting plate;
[0030] The U-shaped limiting plate is disposed below the electric contact plate. One end of the U-shaped limiting plate is fixedly connected to the lower surface of the upper substrate, and the other end is bent downward and the end of the other end is set as a U-shaped structure. The overcurrent protection mechanism is limited by the U-shaped structure.
[0031] The U-shaped limiting plate further limits the overcurrent protection mechanism, making its installation more stable and preventing accidental displacement and detachment during use.
[0032] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0033] 1. This utility model arranges the lower discharge electrodes on the same lower discharge electrode plate, which can be equipped with 1-3 lower discharge electrodes as needed. Each phase of the three-phase high-voltage line is connected to an upper discharge electrode. Each upper discharge electrode corresponds to a lower discharge electrode according to the arrangement of the lower discharge electrodes, so that each lower discharge electrode forms a discharge gap with at least one upper discharge electrode. The three parallel discharge gaps are connected in series with an overcurrent protection mechanism, thereby reducing the production and maintenance costs of the surge arrester.
[0034] 2. This utility model provides an elastic upper connecting mechanism that is elastically electrically connected to the overcurrent protection mechanism, and a rotating lower connecting mechanism that is rotatably electrically connected to the overcurrent protection mechanism. A disconnector is provided on the overcurrent protection mechanism. When the overcurrent protection mechanism fails, the disconnector disengages, separating the overcurrent protection mechanism from the elastic upper connecting mechanism and allowing it to rotate relative to the rotating lower connecting mechanism. This achieves automatic disengagement of the overcurrent protection mechanism after failure, facilitating intuitive observation of its status and convenient replacement. Attached Figure Description
[0035] Figure 1 This is an overall structural diagram of the present invention.
[0036] Figure 2 This is a structural diagram of the discharge unit of this utility model.
[0037] Figure 3 The structure of the disconnected overcurrent protection unit of this utility model Figure 1 .
[0038] Figure 4 The structure of the disconnected overcurrent protection unit of this utility model Figure 2 .
[0039] Figure labels: Discharge unit 100, first insulating support unit 200, disconnectable overcurrent protection unit 300, upper discharge electrode plate 110, upper discharge electrode 111, second insulating support unit 120, lower discharge electrode plate 130, lower discharge electrode 131, elastic upper connecting mechanism 310, overcurrent protection mechanism 320, rotating lower connecting mechanism 330, upper base plate 311, electrical contact plate 312, U-shaped limiting plate 313, upper electrical contact 321, overcurrent protector 322, disconnector 323, insulating connector 324, rotating electrical contact 325, operating ring 326, fixing plate 331, concave plate 332. Detailed Implementation
[0040] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0041] Example 1
[0042] Commonly used surge arresters typically install a separate surge arrester for each phase of the high-voltage line to protect that phase. Each surge arrester usually includes an overcurrent protection structure, which is a consumable. When the operating voltage in the corresponding high-voltage line is too high, causing internal breakdown and failure, it needs to be replaced. Installing an overcurrent protection structure for each phase increases production and maintenance costs. Furthermore, because the failure is caused by internal breakdown, it is not externally visible. The corresponding high-voltage line in the area must be de-energized before the overcurrent protection structure can be removed for testing, which is very cumbersome. Additionally, power outage maintenance degrades the user's electricity experience.
[0043] Therefore, as Figure 1 As shown, this embodiment provides a three-phase combined fault self-disconnecting line arrester, which can reduce production and maintenance costs and make testing more convenient. Specifically, the arrester includes a discharge unit 100, a disconnecting overcurrent protection unit 300, and a first insulation support unit 200.
[0044] The first insulating support unit 200 includes a first end and a second end disposed opposite to each other. In this embodiment, the first end and the second end are the upper end and the lower end of the first insulating support unit 200, respectively.
[0045] like Figure 2 As shown, the discharge unit 100 includes three upper discharge electrode plates 110, three second insulating support units 120, and one lower discharge electrode plate 130. Each upper discharge electrode plate 110 is provided with one upper discharge electrode 111. One end of each second insulating support unit 120 is connected to one upper discharge electrode plate 110, and the other end is connected to the lower discharge electrode plate 130. Each upper discharge electrode plate 110 is connected to one phase of the high-voltage line, and the distance between any two upper discharge electrode plates 110 is not less than a preset first discharge safety distance.
[0046] One to three discharge lower electrodes 131 may be provided on the discharge lower electrode plate 130, and each discharge lower electrode 131 shall correspond to at least one discharge upper electrode 111 to form a discharge gap.
[0047] The upper discharge electrode 111 and the lower discharge electrode 131 are both convex hemispherical or conical. A discharge gap with a fixed distance is formed between the hemispherical surface or the conical tip of the upper discharge electrode 111 and the corresponding lower discharge electrode 131. The fixed distance for forming the discharge gap is 45-85 mm.
[0048] like Figure 2 As shown, in this embodiment, three discharge electrodes 131 can be provided on the discharge lower electrode plate 130. By adjusting the specific shape of the discharge lower electrode plate 130 and the distribution of each discharge lower electrode 131, the distance between every two discharge lower electrodes 131 is not less than a preset second discharge safety distance. The three discharge upper electrodes 111 correspond to the three discharge lower electrodes 131 to form the discharge gap.
[0049] The first and second discharge safety distances are specifically set according to the voltage conditions of the connected three-phase high-voltage lines to ensure that each component in the surge arrester can operate normally.
[0050] Specifically, one specific implementation of this embodiment is as follows: Figure 2As shown, the discharge lower electrode plate 130 is configured in a "+" shape. The upper surface of the middle connection of the cross shape is connected to one end of a second insulating support unit 120. The other end of the second insulating support unit 120 is provided with the discharge upper electrode plate 110. The setting direction of the discharge upper electrode plate 110 matches the front end of the "+" shaped discharge lower electrode plate 130. A hemispherical discharge lower electrode 131 is provided at the upper surface of the front end. A corresponding hemispherical discharge upper electrode 111 is provided on the lower surface of the discharge upper electrode 111. The discharge lower electrode 131 and the discharge upper electrode 111 form a discharge gap. Furthermore, the left and right ends of the "+" shaped discharge lower electrode plate 130 are bent downwards at their respective ends and then extend backwards to form two electrode setting areas. Near the bent portion of the electrode setting area... Each end of the first electrode is provided with a second insulating support unit 120, and the other end of the second insulating support unit 120 is connected to the upper discharge electrode plate 110. The setting direction of the upper discharge electrode plate 110 matches the extension direction of the electrode setting area. The lower discharge electrode 131 and the upper discharge electrode 111 are respectively set at corresponding positions on the corresponding surfaces of the electrode setting area and the upper discharge electrode plate 110 to form the discharge gap. In other embodiments, the specific shape of the lower discharge electrode plate 130 can be changed according to the voltage of the high-voltage line to realize the setting of the lower discharge electrode 131, the second insulating support unit 120, and the upper discharge electrode plate 110 and the upper discharge electrode 111, so as to meet the preset first discharge safety distance and second discharge safety distance. No further limitation is imposed here.
[0051] In another preferred embodiment, one lower discharge electrode 131 may be provided on the lower discharge electrode plate 130, and three upper discharge electrodes 111 respectively form the discharge gap with one lower discharge electrode 131; wherein the shape of the lower discharge electrode plate 130 can be adjusted to realize the setting of each second insulating support unit 120 and the corresponding upper discharge electrode plate 110, so that the first discharge safety distance can be met between the three upper discharge electrodes 111, and the discharge gap can be formed with one lower discharge electrode 131 at the same time;
[0052] In another preferred embodiment, two discharge lower electrodes 131 may be provided on the discharge lower electrode plate 130, and the distance between the two discharge lower electrodes 131 shall not be less than a preset second discharge safety distance; wherein the shape of the discharge lower electrode plate 130 can be adjusted to realize the setting of each of the second insulating support units 120 and the corresponding discharge upper electrode plate 110, so that one of the two discharge upper electrodes 111 forms the discharge gap with one of the discharge lower electrodes 131, and one of the discharge upper electrodes 111 forms the discharge gap with the other discharge lower electrode 131.
[0053] The first end of the first insulating support unit 200 is connected to the lower surface of the cross center of the "+" shaped discharge lower electrode plate 130;
[0054] like Figure 1-3 As shown, the disconnectable overcurrent protection unit 300 includes an elastic upper connection mechanism 310, an overcurrent protection mechanism 320, and a rotating lower connection mechanism 330. The elastic upper connection mechanism 310 is fixedly electrically connected to the discharge lower electrode plate 130. The rotating lower connection mechanism 330 is fixedly connected to the second end of the first insulating support unit 200. One end of the overcurrent protection mechanism 320 is elastically electrically connected to the elastic upper connection mechanism 310, and the other end of the overcurrent protection mechanism 320 is provided with a disconnector 323. The other end of the overcurrent protection mechanism 320 is detachably and rotatably electrically connected to the rotating lower connection mechanism 330 through the disconnector 323. When the overcurrent protection mechanism 320 fails, the disconnector 323 disconnects from the overcurrent protection mechanism 320, causing the overcurrent protection mechanism 320 to rotate relative to the end where the disconnector 323 is located.
[0055] Specifically, such as Figure 3 and Figure 4 As shown, in this embodiment,
[0056] The elastic upper connection mechanism 310 includes an upper substrate 311 and an electric contact plate 312;
[0057] The upper substrate 311 is fixedly electrically connected to the cross-shaped rear end of the discharge lower electrode plate 130; the electric contact plate 312 is disposed below the upper substrate 311, the upper surface of one end of the electric contact plate 312 is fixedly electrically connected to the lower surface of the upper substrate 311, and the middle part of the other end of the electric contact plate 312 is bent downward to form a concave structure. The upper surface of the concave structure is elastically connected to the lower surface of the upper substrate 311 through an elastic mechanism; a convex contact point is provided in the middle of the lower surface of the concave structure of the electric contact plate 312, and the overcurrent protection mechanism 320 is elastically connected to the elastic upper connection mechanism 310 through the contact point contacting and electrically connecting one end of the overcurrent protection mechanism 320.
[0058] The elastic upper connecting mechanism 310 also includes a U-shaped limiting plate 313, such as Figure 2 As shown, the U-shaped limiting plate 313 is disposed below the electric contact plate 312. Specifically, one end of the U-shaped limiting plate 313 is fixedly connected to the lower surface of the upper substrate 311, and the other end is bent downward and the end of the other end is set as a U-shaped structure. The U-shaped structure includes a vertically arranged baffle and two parallel limiting rods. One side of the baffle is fixedly connected to the other end of the U-shaped limiting plate 313, and two limiting rods are arranged on the other side of the baffle. The two limiting rods are respectively arranged at both ends of the same side of the baffle. The U-shaped structure formed by the baffle and the limiting rods limits the overcurrent protection mechanism 320.
[0059] The overcurrent protection mechanism 320 includes an energized contact 321, an overcurrent protector 322, an insulating connector 324, and a rotating electrical contact 325;
[0060] The power-on contact 321 is disposed on the upper end of the overcurrent protector 322. The overcurrent protection mechanism 320 is elastically electrically connected to the elastic upper connection mechanism 310 through the power-on contact 321. Specifically, the power-on contact 321 is configured as an arc shape to match the protruding contact point provided on the electric contact plate 312 of the elastic upper connection mechanism 310, and together with the U-shaped limiting plate 313, limits and fixes the overcurrent protection mechanism 320.
[0061] Furthermore, an operating ring 326 is provided on one side of the power-on contact 321. The operating ring 326 allows the operator to easily install and remove the overcurrent protection mechanism 320 from the bottom surface using an operating lever.
[0062] like Figure 3 and Figure 4 As shown, the lower end of the overcurrent protector 322 is connected to the upper end of the disconnector 323; one end of the insulating connector 324 is fixedly connected to the connection between the overcurrent protector 322 and the disconnector 323, and the other end extends obliquely downward and is rotatably connected to the rotating electrical contact 325; the other end of the disconnector 323 is fixedly electrically connected to the rotating electrical contact 325.
[0063] Specifically, the rotating electrical contact 325 includes a rotating shaft and a conductive support. The conductive support is disposed at the bottom of the rotating shaft, and the other end of the insulating connecting rod is rotatably connected to the rotating shaft. The rotating shaft is fixedly electrically connected to the bottom end of the disconnector 323 through the conductive support.
[0064] The rotating lower connection mechanism 330 includes a concave plate 332 and a fixing plate 331 fixedly connected to the second end of the first insulating support unit 200. The concave portion of the concave plate 332 is fixedly connected to the fixing plate 331. The opening of the concave plate 332 faces downward, and hook structures with upward openings are respectively provided at the ends of both sides of the concave plate 332. The rotating electrical contact 325 is disposed in the groove of the concave plate 332. Rotating shafts are provided on both sides of the rotating electrical contact 325. The rotating electrical contact 325 and the rotating lower connection mechanism 330 are detachably rotated electrically connected through the rotating shafts and hook structures.
[0065] Specifically, in the real-time mode of this embodiment, the three-phase high-voltage lines are electrically connected to three discharge upper electrodes 111, and three discharge lower electrodes 131 are respectively provided on the discharge lower electrode plate 130. The three discharge upper electrodes 111 and the discharge lower electrodes 131 respectively form the discharge gaps corresponding to the three-phase high-voltage lines, which are used to realize the first-level protection of the three-phase high-voltage lines. Further, the three discharge gaps are connected to the disconnected overcurrent protection unit 300 through the discharge lower electrode plate 130. The disconnected overcurrent protection unit 300 includes an overcurrent protector 322 provided with a disconnector 323. The overcurrent protector 322 can eliminate the overvoltage in the three-phase high-voltage lines by utilizing its resistive characteristics, thereby realizing the three-phase high-voltage protection. Secondary protection for high-voltage lines; when the overvoltage protector is completely broken down and fails, the disconnector 323 disengages from the lower end of the overvoltage protector 322, causing the insulation connector 324 and the transmission contact to lose support. The insulation connecting rod drives the overvoltage protector 322 to rotate downward, causing the power-on contact 321 at the upper end of the overvoltage protector 322 to disengage from the contact in the elastic upper connecting mechanism 310. This allows the overvoltage protection mechanism 320 to flip downward relative to the rotating lower connecting mechanism 330, enabling workers to determine whether the overvoltage protector 322 in the overvoltage protection mechanism 320 has failed by observing the state of the overvoltage protection mechanism 320 on the surge arrester, thus facilitating the maintenance of the surge arrester.
[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A three-phase combined fault-disconnecting line arrester, characterized in that, The surge arrester includes a discharge unit, a disconnectable overcurrent protection unit, and a first insulation support unit; The first insulating support unit includes a first end and a second end disposed opposite to each other; The discharge unit includes three upper discharge electrode plates, three second insulating support units, and one lower discharge electrode plate. Each upper discharge electrode plate is provided with one upper discharge electrode. One end of each second insulating support unit is connected to one upper discharge electrode plate, and the other end is connected to the lower discharge electrode plate. One to three lower discharge electrodes are provided on the lower discharge electrode plate, and each lower discharge electrode corresponds to at least one upper discharge electrode to form a discharge gap. Each upper discharge electrode plate is connected to one phase of the high-voltage line, and the distance between any two upper discharge electrode plates is not less than a preset first discharge safety distance. The first end of the first insulating support unit is fixedly connected to the discharge lower electrode plate; One end of the disconnectable overcurrent protection unit is fixedly electrically connected to the discharge lower electrode plate, and the other end of the disconnectable overcurrent protection unit is fixedly electrically connected to the second end of the first insulating support unit. The disconnectable overcurrent protection unit includes an overcurrent protection mechanism. When the overcurrent protection mechanism fails, the overcurrent protection mechanism is disconnected from the disconnectable overcurrent protection unit.
2. A three-phase combined fault-disconnecting line arrester according to claim 1, characterized in that, Both the upper discharge electrode and the lower discharge electrode are convex hemispherical or conical, and a discharge gap with a fixed distance is formed between the spherical surface of the upper discharge electrode and the tip of the cone of the corresponding lower discharge electrode.
3. A three-phase combined fault-disconnecting line arrester according to claim 2, characterized in that, The fixed distance for forming the discharge gap is 45-85mm.
4. A three-phase combined fault-disconnecting line arrester according to claim 1, characterized in that, One lower discharge electrode is provided on the lower discharge electrode plate, and three upper discharge electrodes form the discharge gap with one lower discharge electrode.
5. A three-phase combined fault-disconnecting line arrester according to claim 1, characterized in that, Two discharge lower electrodes are provided on the discharge lower electrode plate. The distance between the two discharge lower electrodes is not less than a preset second discharge safety distance. The two discharge upper electrodes and one discharge lower electrode respectively form the discharge gap, and one discharge upper electrode and another discharge lower electrode form the discharge gap.
6. A three-phase combined fault-disconnecting line arrester according to claim 1, characterized in that, The discharge lower electrode plate is provided with three discharge lower electrodes, and the distance between every two discharge lower electrodes is not less than a preset second discharge safety distance. The three discharge upper electrodes correspond to the three discharge lower electrodes to form the discharge gap.
7. A three-phase combined fault-disconnecting line arrester according to any one of claims 4, 5, or 6, characterized in that, The disconnectable overcurrent protection unit includes an elastic upper connection mechanism, a rotating lower connection mechanism, and the overcurrent protection mechanism. The elastic upper connection mechanism is fixedly electrically connected to the discharge lower electrode plate. The rotating lower connection mechanism is fixedly connected to the second end of the first insulating support unit. One end of the overcurrent protection mechanism is elastically electrically connected to the elastic upper connection mechanism, and the other end of the overcurrent protection mechanism is provided with a disconnector. The other end of the overcurrent protection mechanism is detachably and rotatably electrically connected to the rotating lower connection mechanism through the disconnector. When the overcurrent protection mechanism fails, the disconnector disengages from the overcurrent protection mechanism, causing the overcurrent protection mechanism to rotate relative to the end where the disconnector is located.
8. A three-phase combined fault-disconnecting line arrester according to claim 7, characterized in that, The elastic upper connection mechanism includes an upper substrate and an electrical contact plate; The upper substrate is fixedly electrically connected to the lower discharge electrode plate; the electrical contact plate is disposed below the upper substrate, the upper surface of one end of the electrical contact plate is fixedly electrically connected to the lower surface of the upper substrate, and the middle part of the other end of the electrical contact plate is bent downward to form a concave structure. The upper surface of the concave structure is elastically connected to the lower surface of the upper substrate through an elastic mechanism; a convex contact point is provided in the middle of the lower surface of the concave structure of the electrical contact plate, and the overcurrent protection mechanism and the elastic upper connection mechanism are elastically connected through the contact point to one end of the overcurrent protection mechanism.
9. A three-phase combined fault-disconnecting line arrester according to claim 7, characterized in that, The overcurrent protection mechanism includes a power-on contact, an overcurrent protector, an insulating connector, and a rotating electrical contact; The power-on contact is located at one end of the overcurrent protector, and the overcurrent protection mechanism is elastically electrically connected to the elastic upper connection mechanism through the power-on contact; an operating ring is provided on one side of the power-on contact; The other end of the overcurrent protector is connected to one end of the disconnector; one end of the insulating connector is fixedly connected to the connection between the overcurrent protector and the disconnector, and the other end is rotatably connected to the rotating electrical contact. The other end of the disconnector is fixedly electrically connected to the rotating electrical contact. The rotating lower connection mechanism includes a concave plate and a fixed plate fixedly connected to the second end of the first insulating support unit. The concave portion of the concave plate is fixedly connected to the fixed plate, and hook structures are respectively provided at the ends of both sides of the concave plate. The rotating electrical contact is disposed in the groove of the concave plate, and rotating shafts are provided on both sides of the rotating electrical contact. The rotating shafts and hook structures enable a detachable rotating electrical connection between the rotating electrical contact and the rotating lower connection mechanism.
10. A three-phase combined fault-disconnecting line arrester according to claim 8, characterized in that, The elastic upper connection mechanism also includes a U-shaped limiting plate; The U-shaped limiting plate is disposed below the electric contact plate. One end of the U-shaped limiting plate is fixedly connected to the lower surface of the upper substrate, and the other end is bent downward and the end of the other end is set as a U-shaped structure. The overcurrent protection mechanism is limited by the U-shaped structure.