Lightning arrester for high-voltage overhead line

Abstract

The utility model discloses a lightning arrester for a high-voltage overhead line, which belongs to the technical field of lightning arresters, and comprises an insulating rubber sleeve, an insulating mounting sleeve, a plurality of valve plates, a conductive block I and a pressing component, a first conductive block and a second conductive block are arranged at the two ends of the stacked valve blocks correspondingly for conducting, a pressing assembly is arranged at the top of the first conductive block, a mounting ring is rotated to enable a pressing piece to tightly press the first conductive block and then deform, the deformed pressing piece can always keep downward pressure on the first conductive block, the multiple valve blocks tightly abut against one another, and the sealing effect is good. Meanwhile, the outer end of the insulating mounting sleeve is further sleeved with the insulating sleeve made of ceramic, and the insulating glaze sleeve, the insulating mounting sleeve and the insulating sleeve are attached in an insulating mode, so that the zinc oxide resistor disc can be prevented from discharging from the side face, and the zinc oxide resistor disc can only be conducted from top to bottom.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, and more specifically, to a surge arrester for high-voltage overhead lines. Background Technology

[0002] The mainstream surge arrester for high-voltage overhead lines is the zinc oxide surge arrester, a widely used overvoltage protection device in modern power systems. It is primarily used to limit lightning or switching overvoltages, protecting electrical equipment (such as transformers and switches) from damage caused by high-voltage surges. Its core material is zinc oxide, which possesses excellent nonlinear volt-ampere characteristics.

[0003] Chinese Patent Announcement No. CN219937919U discloses a zinc oxide surge arrester. This design utilizes a thick pull conductor. Because the thick pull conductor can deform, it is convenient to fix the end of the thick pull conductor at any position within a certain range. This allows for easy installation even when there is vertical displacement between the housing and the frame, without restricting the core rod to a vertical installation position. This makes it convenient to use. After rotating the stud along the hinge on the thin protrusion to one side, the cable can be easily clamped in the end hook. Then, rotating the stud to a vertical position and tightening the nut onto the thin protrusion prevents the stud from rotating easily. At the same time, the clamping ring can also be used to clamp the cable clamped in the end hook, making it convenient to use.

[0004] Zinc oxide surge arresters mainly release the high voltage during lightning strikes through the nonlinear volt-ampere characteristics provided by the internal zinc oxide varistor. Multiple zinc oxide varistors are installed by stacking them together. Shaking during transportation and vibration during installation and use can easily cause gaps to appear between the zinc oxide varistors. The air in the gaps will cause partial discharge under a strong electric field, and long-term discharge will corrode the surface of the varistor.

[0005] Therefore, a surge arrester for high-voltage overhead lines is proposed to address the above problems. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] This utility model provides a surge arrester for high-voltage overhead lines, which can improve the problems existing in related technologies: shaking during transportation and vibration during installation and use can easily cause gaps between zinc oxide valve plates. The air in the gaps will cause partial discharge under a strong electric field, and long-term discharge will corrode the surface of the valve plates.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] This application provides a high-voltage overhead line surge arrester, comprising: an insulating rubber sleeve, an insulating mounting sleeve, valve plates, a conductive block, and a clamping assembly. The internal space of the insulating rubber sleeve is isolated from the external environment. The insulating mounting sleeve includes a sleeve with an internal thread engraved at the top of the sleeve. The valve plates are vertically stacked inside the sleeve. The conductive block is disposed on the top of the valve plates. The clamping assembly includes a pressing plate and a mounting ring adapted to the internal thread. The pressing plate protrudes outward, and the top of the pressing plate is fixedly connected to the mounting ring. The mounting ring is installed inside the sleeve by being threaded to the internal thread. The bottom of the pressing plate presses against the conductive block, forcing the multiple valve plates to be stacked and tightly attached together.

[0011] The technical solutions described in this application embodiment have at least the following technical effects:

[0012] Multiple stacked valve plates are fitted inside an insulating mounting sleeve. Conductive blocks one and two are respectively installed at both ends of the stacked valve plates to conduct electricity. A clamping component is installed on top of conductive block one. By rotating the mounting ring, the pressure plate is pressed tightly against conductive block one and deformed. The deformed pressure plate will always maintain downward pressure on conductive block one, so that the multiple valve plates are tightly pressed together and gaps are not easily generated during vibration. At the same time, an insulating sleeve made of ceramic is also fitted on the outer end of the insulating mounting sleeve. Through the three layers of insulation of insulating glaze sleeve, insulating mounting sleeve and insulating sleeve, the zinc oxide resistor can be prevented from discharging from the side, so that it can only be conducted from top to bottom.

[0013] In some embodiments, sealing rings are provided at both ends of the insulating rubber sleeve, and sealing caps are fixedly installed at both ends of the insulating rubber sleeve. The sealing caps form a seal with the insulating rubber sleeve through the sealing rings. An insulating bracket is installed at the bottom of one of the sealing caps. The insulating rubber sleeve is installed on the line through the insulating bracket. A thermal explosion release mechanism is provided at the bottom of the insulating bracket. A grounding terminal is installed at the bottom of the thermal explosion release mechanism. The grounding terminal is connected to a grounding device.

[0014] In some embodiments, a second conductive block is provided at the bottom of the valve plate. Both the first conductive block and the second conductive block are located inside the sleeve. A first wiring terminal is installed at the outer end of the first conductive block, and a second wiring terminal is installed at the outer end of the second conductive block. The first wiring terminal and the second wiring terminal extend through the two sealing caps to their outer ends.

[0015] In some embodiments, a lead end is installed at one outer end of the terminal block, the lead end is connected to the line cable, the second outer end of the terminal block passes through the insulating bracket and is connected to the thermal explosion release mechanism, a dust cover is sleeved on the outer end of the lead end, and an umbrella-shaped cap is fixedly installed on the outer end of the dust cover.

[0016] In some embodiments, the valve plate includes a zinc oxide resistance plate and an insulating glaze sleeve, the insulating glaze sleeve being installed around the zinc oxide resistance plate and abutting against the inner side of the sleeve.

[0017] In some embodiments, the insulating mounting sleeve further includes a retaining ring, which is fixedly installed at the bottom of the inner side of the sleeve. The retaining ring abuts against the conductive block. An insulating sleeve is fitted on the outer end of the sleeve, and the insulating sleeve is in close contact with the inner wall of the insulating rubber sleeve.

[0018] In some embodiments, the bottom end of the pressure plate has a through hole, the terminal block has a through hole, and the outer end of the mounting ring has two slots. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the insulating rubber sleeve of this utility model;

[0022] Figure 4 This is a schematic diagram of the insulating mounting sleeve structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the pressing component structure of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Insulating rubber sleeve;

[0026] 2. Insulating support;

[0027] 3. Thermal explosion release mechanism;

[0028] 4. Grounding terminal;

[0029] 5. Cap;

[0030] 6. Dust cover;

[0031] 7. Lead wire end;

[0032] 8. Terminal block one;

[0033] 9. Two wiring terminals;

[0034] 10. Sealing cap;

[0035] 11. Sealing ring;

[0036] 12. Clamping assembly; 121. Pressure plate; 122. Mounting ring; 123. Through hole; 124. Slot;

[0037] 13. Insulating sleeve;

[0038] 14. Insulating mounting sleeve; 141. Sleeve; 142. Internal thread; 143. Retaining ring;

[0039] 15. Valve plate; 151. Zinc oxide resistance element; 152. Insulating glaze sleeve;

[0040] 16. Conductive block one;

[0041] 17. Conductive block two. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0043] Please see Figure 1 - Figure 5 A high-voltage overhead line surge arrester includes: an insulating rubber sleeve 1, an insulating mounting sleeve 14, valve plates 15, a conductive block 16, and a clamping assembly 12. The internal space of the insulating rubber sleeve 1 is isolated from the external environment. The insulating mounting sleeve 14 includes a sleeve 141 with an internal thread 142 engraved on the top of the sleeve 141. The valve plates 15 are vertically stacked inside the sleeve 141. The conductive block 16 is located on top of the valve plates 15. The clamping assembly 12 includes a pressing plate 121 and a mounting ring 122 adapted to the internal thread 142. The pressing plate 121 protrudes outward. The top of the pressing plate 121 is fixedly connected to the mounting ring 122. The mounting ring 122 is installed inside the sleeve 141 by being threaded to the internal thread 142. The bottom of the pressing plate 121 presses against the conductive block 16, forcing the multiple valve plates 15 to be stacked and tightly attached together.

[0044] The device in this scheme is mainly installed on high-voltage lines to protect electrical equipment such as transformers from lightning strikes. One end of the surge arrester is directly connected to the high-voltage line, while the other end needs to be grounded. The outer end of the insulating rubber sleeve 1 is umbrella-shaped and made of insulating rubber. It mainly protects the internal valve plate 15 and prevents the surge arrester's terminals from directly connecting across the valve plate 15 during rain, thus providing insulation.

[0045] An insulating sleeve 13 is first installed inside the insulating rubber sleeve 1. An insulating sleeve 13 is then installed inside the insulating sleeve 13. An insulating mounting sleeve 14 is then installed inside the insulating sleeve 13. Multiple stacked valve plates 15 are wrapped inside the insulating mounting sleeve 14. Conductive blocks 16 and 17 are respectively installed at both ends of the stacked valve plates 15 for conduction. A clamping assembly 12 is installed on top of the conductive block 16. The assembly is installed by rotation. The ring 122 causes the pressure plate 121 to press tightly against the conductive block 16 and deform. The deformed pressure plate 121 will always maintain downward pressure on the conductive block 16, so that the multiple valve plates 15 are tightly pressed together and gaps are not easily generated during vibration. At the same time, an insulating sleeve 13 made of ceramic is also sleeved on the outer end of the insulating mounting sleeve 14. Through the three layers of insulation of insulating glaze sleeve 152, insulating mounting sleeve 14 and insulating sleeve 13, the zinc oxide resistor plate 151 can be prevented from discharging from the side, so that it can only be conducted from top to bottom.

[0046] Please see Figure 1 and Figure 2 Both ends of the insulating rubber sleeve 1 are provided with sealing rings 11, and both ends of the insulating rubber sleeve 1 are fixedly installed with sealing caps 10. The sealing caps 10 form a seal with the insulating rubber sleeve 1 through the sealing rings 11. An insulating bracket 2 is installed at the bottom of one of the sealing caps 10. The insulating rubber sleeve 1 is installed on the line through the insulating bracket 2. A thermal explosion release mechanism 3 is provided at the bottom of the insulating bracket 2. A grounding terminal 4 is installed at the bottom of the thermal explosion release mechanism 3. The grounding terminal 4 is connected to the grounding device.

[0047] Sealing rings 11 are provided at both ends of the insulating rubber sleeve 1, and sealing caps 10 are installed at both ends of the insulating rubber sleeve 1. The sealing rings 11 are located between the sealing caps 10 and the insulating rubber sleeve 1 to fill and seal. The sealing caps 10 can be glued or bent at the outer edge to lock onto the port of the insulating rubber sleeve 1, mainly to seal the insulating rubber sleeve 1. An insulating bracket 2 is fixed on the sealing cap 10 located below. The insulating bracket 2 is made of insulating plastic and is fixed to a place that can provide support, such as a utility pole. The surge arrester can be installed through the insulating bracket 2. A thermal detonator is provided below the insulating bracket 2. The thermal explosion disconnection mechanism 3 has an exposed grounding terminal 4 at its bottom. The grounding terminal 4 is mainly used to connect the grounding mechanism and can be connected to the earth via cables or copper busbars. The thermal explosion disconnection mechanism 3 is a key safety protection device, mainly used to quickly disconnect the connection between the surge arrester and the power system when a serious fault occurs, thereby avoiding equipment explosion, fire or power grid accident. When the surge arrester has an internal short circuit due to valve plate aging, moisture, overvoltage breakdown or continuous heating, the disconnection device will thermally explode through a thermal triggering mechanism to physically disconnect the electrical connection between the surge arrester and the system, preventing the continuous flow of fault current.

[0048] Please see Figure 1 - Figure 4 A conductive block 17 is provided at the bottom of the valve plate 15. Both conductive blocks 16 and 17 are located inside the sleeve 141. A terminal 8 is installed at the outer end of conductive block 16, and a terminal 9 is installed at the outer end of conductive block 17. Terminals 8 and 9 extend through the two sealing caps 10 to their outer ends.

[0049] Terminal 1 8 has a lead end 7 installed on its outer end, which is connected to the line cable. Terminal 2 9 has its outer end passing through the insulating bracket 2 and connected to the thermal release mechanism 3. A dust cover 6 is fitted on the outer end of the lead end 7, and an umbrella-shaped cap 5 is fixedly installed on the outer end of the dust cover 6.

[0050] Conductive blocks 16 and 17, made of copper, are respectively installed at the upper and lower ends of multiple stacked valve plates 15 to abut against each other. These conductive blocks 16 and 17 are primarily used for conductive contact with the valve plates 15. A terminal 8 is threaded onto conductive block 16, and a terminal 9 is threaded onto conductive block 17. Terminals 8 and 9 extend through the upper and lower sealing covers 10 to the outside. Terminal 9 also penetrates the insulating bracket 2 and connects to the interior of the thermal explosion release mechanism 3, and is also connected to the grounding terminal 4 at the bottom of the thermal explosion release mechanism 3 for conductive contact. A lead wire 7 is installed on the top of terminal 8. The lead wire 7 is mainly used for... Composed of wires, the lead end 7 is connected to the high-voltage line. Due to the nonlinear voltage-current characteristic of the valve plate 15, the resistance of the valve plate 15 changes drastically with voltage, and is divided into three working regions. In the low electric field region, the valve plate is in a high resistance state with a resistance of megaohms, and only μA-level leakage current passes through. When the line is struck by lightning and the voltage rises instantaneously, the resistance of the valve plate 15 drops sharply to the ohm level, and kA-level lightning current is instantly discharged. The current can be guided to the ground through the lead end 7, terminal 8, conductive block 16, valve plate 15, conductive block 17, terminal 9, and grounding end 4. After the lightning strike ends, the valve plate 15 will return to a high resistance and near-insulating state.

[0051] A dust cover 6 is fitted at the connection position of the lead end 7 and the terminal 8, mainly to prevent dust. The cap 5 fixed to the outer end of the dust cover 6 has a diameter larger than the insulating rubber sleeve 1, mainly for covering purposes, which can prevent bird droppings from falling onto the surface of the insulating rubber sleeve 1.

[0052] Please see Figure 5 The valve plate 15 includes a zinc oxide resistance plate 151 and an insulating glaze sleeve 152. The insulating glaze sleeve 152 is installed around the zinc oxide resistance plate 151 and abuts against the inner side of the sleeve 141.

[0053] The valve plate 15 in this scheme is mainly composed of a zinc oxide resistor 151 and an insulating glaze sleeve 152. The zinc oxide resistor 151 is made of zinc oxide, while the insulating glaze sleeve 152 is insulating. The insulating glaze sleeve 152 can be sintered on the outer surface of the zinc oxide resistor 151 so that only the upper and lower end faces of the zinc oxide resistor 151 can conduct electricity.

[0054] Please see Figure 4 The insulating mounting sleeve 14 also includes a retaining ring 143, which is fixedly installed on the bottom inner side of the sleeve 141. The retaining ring 143 abuts against the conductive block 17. An insulating sleeve 13 is fitted on the outer end of the sleeve 141, and the insulating sleeve 13 is in close contact with the inner wall of the insulating rubber sleeve 1.

[0055] The insulating mounting sleeve 14 in this solution is mainly used to wrap and fix multiple stacked valve pieces 15. The insulating mounting sleeve 14 is made of insulating epoxy resin. The internal thread 142 on the inner side of the top of the insulating mounting sleeve 14 is mainly used to cooperate with the clamping assembly 12. A retaining ring 143 is fixed at the bottom of the sleeve 141. The retaining ring 143 is mainly used to support the valve piece 15. An insulating sleeve 13 is sleeved around the outside of the sleeve 141. The insulating sleeve 13 is made of ceramic and is mainly used to cooperate with the sleeve 141 and the insulating glaze sleeve 152 to prevent the zinc oxide resistor piece 151 from discharging to the side.

[0056] Please see Figure 5 The bottom end of the pressure plate 121 has a through hole 123, and the wiring terminal 18 passes through the through hole 123. The outer end of the mounting ring 122 has two slots 124.

[0057] The clamping assembly 12 in this solution is mainly used to clamp the vertically stacked valve plates 15. The outer side of the mounting ring 122 is provided with an external thread that matches the internal thread 142. The mounting ring 122 is connected to the inner thread of the internal thread 142. A pressure plate 121 is fixed at the bottom of the mounting ring 122. The pressure plate 121 is designed to bulge downwards and its bottom is tightly pressed against the conductive block 16. A through hole 123 is opened at its bottom so that the terminal 8 can pass through. Two slots 124 are opened at the outer end of the mounting ring 122. After inserting needle-nose pliers into the inside of the two slots 124, the mounting ring 122 can be rotated so that the pressure plate 121 is pressed against the conductive block 16 and undergoes a slight deformation. The pressure plate 121 will always be pressed tightly against the conductive block 16, so that the valve plates 15 are tightly pressed together to prevent gaps from being generated when they shake or vibrate, and to prevent gap discharge.

[0058] Working principle: This device is installed on the high-voltage power line and fixed by the insulating bracket 2. The end of the lead wire 7 is connected to the high-voltage line, and the grounding end 4 is connected to the grounding mechanism through a cable or copper busbar. The insulating mounting sleeve 14 is mainly used to wrap and fix multiple stacked valve plates 15. The pressure plate 121 is designed to bulge downwards. Rotating the mounting ring 122 makes the pressure plate 121 press tightly against the conductive block 16, causing a slight deformation, which prevents gaps from being generated when it shakes or vibrates. When the line is struck by lightning and the voltage rises instantaneously, the resistance of the valve plate 15 drops sharply to the ohm level, instantly discharging the kA level lightning current. Through the lead wire end 7, the wiring end 8, the conductive block 16, the valve plate 15, the conductive block 17, the wiring end 9, and the grounding end 4, the current can be guided to the ground to protect the line.

Claims

1. A surge arrester for high-voltage overhead lines, characterized in that, include: An insulating rubber sleeve (1) isolates the internal space from the external environment; An insulating mounting sleeve (14) includes a sleeve (141) with an internal thread (142) engraved at the top of the sleeve (141). Valve plate (15), the valve plate (15) is vertically stacked inside the sleeve (141); A conductive block (16) is disposed on top of the valve plate (15); A clamping assembly (12) includes a pressure plate (121) and a mounting ring (122) adapted to an internal thread (142). The pressure plate (121) protrudes outward, and the top of the pressure plate (121) is fixedly connected to the mounting ring (122). The mounting ring (122) is installed inside the sleeve (141) by threaded connection with the internal thread (142). The bottom of the pressure plate (121) presses against the conductive block (16), forcing multiple valve plates (15) to overlap and stick together.

2. The surge arrester for high-voltage overhead lines according to claim 1, characterized in that: Both ends of the insulating rubber sleeve (1) are provided with sealing rings (11), and both ends of the insulating rubber sleeve (1) are fixedly installed with sealing caps (10). The sealing caps (10) form a seal with the insulating rubber sleeve (1) through the sealing rings (11). One of the sealing caps (10) is installed with an insulating bracket (2) at the bottom. The insulating rubber sleeve (1) is installed on the line through the insulating bracket (2). The bottom of the insulating bracket (2) is provided with a thermal explosion release mechanism (3). The bottom end of the thermal explosion release mechanism (3) is installed with a grounding terminal (4). The grounding terminal (4) is connected to the grounding device.

3. A surge arrester for high-voltage overhead lines according to claim 2, characterized in that: The bottom of the valve plate (15) is provided with a conductive block two (17). The conductive block one (16) and the conductive block two (17) are both located inside the sleeve (141). The outer end of the conductive block one (16) is provided with a wiring terminal one (8), and the outer end of the conductive block two (17) is provided with a wiring terminal two (9). The wiring terminal one (8) and the wiring terminal two (9) extend to the outer end through the two sealing caps (10) respectively.

4. A surge arrester for high-voltage overhead lines according to claim 3, characterized in that: The outer end of the first terminal (8) is equipped with a lead end (7), which is connected to the line cable. The outer end of the second terminal (9) passes through the insulating bracket (2) and is connected to the thermal explosion release mechanism (3). The outer end of the lead end (7) is covered with a dust cover (6), and the outer end of the dust cover (6) is fixedly equipped with an umbrella-shaped cap (5).

5. A surge arrester for high-voltage overhead lines according to claim 1, characterized in that: The valve plate (15) includes a zinc oxide resistor plate (151) and an insulating glaze sleeve (152). The insulating glaze sleeve (152) is installed around the zinc oxide resistor plate (151) and abuts against the inner side of the sleeve (141).

6. A surge arrester for high-voltage overhead lines according to claim 1, characterized in that: The insulating mounting sleeve (14) also includes a retaining ring (143), which is fixedly installed on the bottom inner side of the sleeve (141). The retaining ring (143) abuts against the conductive block (17). An insulating sleeve (13) is fitted on the outer end of the sleeve (141), and the insulating sleeve (13) is in close contact with the inner wall of the insulating rubber sleeve (1).

7. A surge arrester for high-voltage overhead lines according to claim 3, characterized in that: The bottom end of the compression plate (121) is provided with a through hole (123), the terminal block (8) passes through the through hole (123), and the outer end of the mounting ring (122) is provided with two slots (124).

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