阅读说明：本技术 一种500kV输电线路用防风偏跳线避雷器 (500kV transmission line is with preventing wind partially jumper wire arrester ) 是由 赵凯铭 朱树立 赵培新 郑均 刘新 劳超平 杨可沁 于 2020-12-24 设计创作，主要内容包括：本发明公开了一种500kV输电线路用防风偏跳线避雷器,包括避雷器本体一、避雷器本体二和放电间隙组件,避雷器本体一与避雷器本体二规格相同,避雷器本体一与避雷器本体二相互靠近的一端相连接,避雷器本体二与放电间隙组件相互靠近的一端相连接,避雷器本体一的内侧设置有电阻片柱,电阻片柱的外侧设置有环氧玻璃丝缠绕管,电阻片柱与环氧玻璃丝缠绕管之间缝隙内填充有硅橡胶,环氧玻璃丝缠绕管的外侧设置有避雷器硅橡胶伞套。本发明一种500kV输电线路用防风偏跳线避雷器的绝缘密封性和安全性高,可有效避免引流跳线风偏,集跳线串、重锤片、V字绝缘子串及常规线路避雷器的功能于一身,安装施工难度低,适合推广使用。(The invention discloses a 500kV transmission line lightning arrester with a windage yaw jumper preventing function, which comprises a lightning arrester body I, a lightning arrester body II and a discharge gap assembly, wherein the lightning arrester body I and the lightning arrester body II are identical in specification, the lightning arrester body I is connected with one end, close to the lightning arrester body II, of the lightning arrester body II, the other end, close to the discharge gap assembly, of the lightning arrester body II is connected, a resistor disc column is arranged on the inner side of the lightning arrester body I, an epoxy glass fiber winding pipe is arranged on the outer side of the resistor disc column, a gap between the resistor disc column and the epoxy glass fiber winding pipe is filled with silicon rubber, and a lightning arrester silicon rubber umbrella sleeve is arranged on the outer side of the epoxy glass fiber winding. The wind deflection preventing jumper arrester for the 500kV transmission line has high insulation tightness and safety, can effectively avoid wind deflection of the drainage jumper, integrates the functions of a jumper string, a heavy hammer sheet, a V-shaped insulator string and a conventional line arrester, is low in installation and construction difficulty, and is suitable for popularization and use.)

1. A500 kV transmission line is with preventing wind bias wire jumper arrester, includes arrester body one (1), arrester body two (2) and discharge gap subassembly (3), arrester body one (1) and arrester body two (2) specification are the same, its characterized in that, arrester body one (1) is connected with the one end that arrester body two (2) are close to each other, arrester body two (2) is connected with the one end that discharge gap subassembly (3) are close to each other, the inboard of arrester body one (1) is provided with resistance card post (11), the outside of resistance card post (11) is provided with epoxy glass silk winding pipe (13), the intussuseption is filled with silicon rubber (12) between epoxy glass silk winding pipe (13) and the piece post (11), the outside of epoxy glass silk winding pipe (13) is provided with arrester silicon rubber umbrella cover (14), the utility model discloses a high-voltage fuse structure, including epoxy glass silk winding pipe (13), the both ends inside all is provided with electric current and draws forth subassembly (16) and insulating cushion (17), resistance card post (11) are close to electric current and draw forth between subassembly (16) and be provided with compression spring (15), discharge gap subassembly (3) are including body side flange (31), epoxy glass silk insulating core rod (32), subassembly silicon rubber chute boot (33), discharge gap electrode (34) and wire side connecting plate gold utensil (35), subassembly silicon rubber chute boot (33) set up in the outside of epoxy glass silk insulating core rod (32) and with epoxy glass silk insulating core rod (32) whole compression molding, wire side connecting plate gold utensil (35) and body side flange (31) fixed connection are respectively at the both ends of epoxy glass silk insulating core rod (32).

2. The lightning arrester with the function of preventing the wind-bias jumper wire for the 500kV power transmission line according to claim 1, wherein end fittings (18) are fixedly connected to both ends of the first lightning arrester body (1) and both ends of the second lightning arrester body (2), and the two adjacent end fittings (18) are fixedly connected through bolts.

3. The lightning arrester for preventing the wind bias jumper wire for the 500kV power transmission line according to claim 2, wherein one end of the lightning arrester body I (1) far away from the lightning arrester body II (2) is connected with the 500kV line iron tower cross arm through an end fitting (18), and one end of the discharge gap component (3) far away from the lightning arrester body II (2) is connected with the 500kV line drainage jumper wire through a wire side connecting plate fitting (35).

4. The lightning arrester with the function of preventing the wind-bias jumper wire for the 500kV transmission line according to claim 1, wherein the resistance sheet column (11) is formed by overlapping and connecting a plurality of groups of nonlinear metal oxide resistance sheets in series, and the lightning arrester silicon rubber umbrella cover (14) is formed by integral compression molding.

5. The lightning arrester of claim 1, wherein the current lead-out assembly (16) is connected to a discharge counter monitoring device via a lead-out terminal.

Technical Field

The invention relates to the technical field of high-voltage alternating current arresters, in particular to a windage yaw jumper wire arrester for a 500kV power transmission line.

Background

The 500kV alternating current transmission line is a backbone network for power transmission in China and is an important channel for interconnection among large power systems in trans-provincial regions. And the tripping accidents caused by insulation flashover of the drainage jumper of the 500kV alternating-current transmission line frequently occur, so that the safety operation of the transmission line is greatly influenced, and particularly the tripping accidents caused by insulation flashover discharge are serious under severe weather conditions of strong wind, thunderstorm and rain.

According to statistics, the wind deflection flashover trip accidents of 500kV and above transmission lines governed by the national grid company in 2018 are generated for more than 100 times. The range of the insulation flashover discharge of the drainage jumper caused by wind deviation is wide, the times are multiple, the influence is large, and particularly, the typhoon-prone area in the coastal region is more serious. Under the action of strong wind, the swing amplitude of a current-guiding jumper wire of a 500kV alternating-current transmission line is large, the insulation clear distance between a wire and an iron tower is reduced, insulation flashover discharge is caused under lightning overvoltage, and insulation flashover discharge accidents can occur under operation overvoltage and even under working voltage. If the reclosing is unsuccessful, the line is shut down, and great loss is caused to national economy.

According to the analysis of the wind deflection flashover trip accident of the prior alternating current transmission line, the reasons are as follows:

1. strong wind is the most direct cause of flashover discharge caused by windage yaw of the drainage jumper. The traditional jumper wire insulator strings are made of conventional porcelain or glass, and under the action of strong wind, the jumper wire insulator string on one side inclines towards the tower direction, so that the air gap distance between a lead and an iron tower is reduced. When the wind speed exceeds the designed wind speed, flashover discharge occurs when the air gap distance cannot meet the minimum discharge voltage requirement;

2. the composite insulator is adopted for line climbing adjustment, and wind deflection check is not carried out, so that air gap flashover discharge can be caused even if the swinging amplitude of a heavy hammer is large in wind deflection due to light dead weight of the composite insulator.

At present, the main solutions are as follows:

1. reinforcing the windproof stay wire: the stay wire is used for fixing the line hardware fitting and the lead, so that the wind deflection generated on the line can be well inhibited. However, the line hardware is easy to be damaged by fatigue due to long-time stress caused by unfixed windage yaw rotation. Therefore, the windproof stay wire is additionally arranged, so that a large potential safety hazard still exists in the operation of the line;

2. adding a heavy hammer: the effect of additionally arranging the heavy hammer is limited, and the problem of the hanging wind and wind drift flashover cannot be fundamentally solved;

3. adopting a windage yaw prevention insulator: the insulator has small windage yaw swing amplitude, increases the electric clearance between the wire and the tower, and is reliably installed, but the wire is more seriously windy and waved due to larger insulation external dimension aiming at the 500kV and above line;

4. the adjustment of the creepage distance of the jumper insulator and the reduction of the tower grounding resistance are traditional measures for reducing the lightning trip-out rate of the power transmission line, but the problem of trip-out accidents caused by flashover discharge caused by wind deflection and the like of the jumper cannot be effectively solved;

5. the conventional line arrester with the series gap is additionally arranged at the position of the current-guiding jumper wire, so that lightning overvoltage can be reduced, but wind deflection of the current-guiding jumper wire cannot be inhibited, and insulation flashover accidents can occur under lightning overvoltage, operation overvoltage and even working voltage;

the 6.500 kV line is still provided with the conventional jumper string due to the limitation of the bending resistance of the conventional composite insulator core rod. The jumper string of the 500kV power transmission line is generally assembled by vertically hanging or additionally hanging a heavy hammer piece at home and abroad, and the assembly mode can not radically solve the problem of windage yaw flashover of the jumper;

7. in the coastal strong wind area, a V-shaped jumper string assembling mode is possibly adopted, and because a pair of insulators are required to be added and the jumper cross arm is also required to be lengthened, the investment construction and maintenance cost is increased.

To sum up, measures for preventing the insulation flashover discharge at the drainage jumper of the 500kV alternating-current transmission line include resistance reduction, creepage increase, windage yaw prevention insulators and heavy hammer sheets, additional installation of a conventional line arrester and the like, and still can not effectively solve the tripping accident caused by the insulation flashover discharge of the drainage jumper. If the method adopts the measure of simultaneously installing the wind deflection prevention insulator and the line arrester, the problems of high implementation difficulty and high construction and maintenance cost are faced. Therefore, we propose a windage yaw jumper arrester for 500kV transmission lines to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a wind deflection jumper wire lightning arrester for a 500kV transmission line.

In order to achieve the purpose, the invention adopts the following technical scheme:

a500 kV transmission line is with preventing wind bias wire jumper arrester, including arrester body one, arrester body two and discharge gap subassembly, arrester body one and arrester body two specification are the same, arrester body one is connected with the one end that arrester body two are close to each other, arrester body two is connected with the one end that discharge gap subassembly is close to each other, the inboard of arrester body one is provided with the resistance card post, the outside of resistance card post is provided with epoxy glass silk winding pipe, the gap between epoxy glass silk winding pipe and the resistance card post is filled with silicon rubber, the outside of epoxy glass silk winding pipe is provided with arrester silicon rubber chute boot, the inside both ends of epoxy glass silk winding pipe all is provided with electric current extraction subassembly and insulating cushion, the one end that the resistance card post is close to the electric current extraction subassembly is provided with compression spring with the electric current extraction subassembly, the discharge gap assembly comprises a body side flange, an epoxy glass fiber insulation core rod, an assembly silicon rubber umbrella sleeve, a discharge gap electrode and a wire side connecting plate fitting, the assembly silicon rubber umbrella sleeve is arranged on the outer side of the epoxy glass fiber insulation core rod and is integrally compression-molded with the epoxy glass fiber insulation core rod, and the wire side connecting plate fitting and the body side flange are fixedly connected to two ends of the epoxy glass fiber insulation core rod respectively.

Preferably, the two ends of the first lightning arrester body and the two ends of the second lightning arrester body are fixedly connected with end part hardware fittings, and the two adjacent end part hardware fittings are fixedly connected through bolts.

Preferably, the end, far away from arrester body two, of arrester body one is passed through the tip gold utensil and is linked to each other with 500kV circuit iron tower cross arm, and the one end that the discharge gap subassembly was kept away from arrester body two is passed through wire side connecting plate gold utensil and is linked to each other with 500kV circuit drainage wire jumper.

Preferably, the resistance card column is formed by overlapping and connecting a plurality of groups of nonlinear metal oxide resistance cards in series, and the lightning arrester silicon rubber umbrella cover is formed by integral compression molding.

Preferably, the current leading-out assembly is connected with the discharge counter monitoring device through a leading-out terminal.

Compared with the prior art, the first lightning arrester body and the second lightning arrester body of the windage yaw jumper wire preventing lightning arrester for the 500kV transmission line are both non-linear metal oxide resistance sheet parts contained in the composite outer sleeve, and a discharge gap component is added to be connected to form a complete metal oxide lightning arrester with a series gap; the outer part of the resistor disc column is provided with an epoxy glass wire winding pipe which is used for fixing the resistor disc column and bearing mechanical loads (including bending loads, tensile loads and the like) of the lightning arrester body I and the lightning arrester body II; the lightning arrester silicon rubber umbrella sleeve is integrally molded and formed outside the epoxy glass wire winding pipe, is used for providing good sealing protection for the internal resistance sheet column and the epoxy glass wire winding pipe and preventing internal elements from being affected with damp, and also provides external insulation performance (including lightning impact, power frequency wet withstand voltage and pollution resistance performance) of the lightning arrester body I and the lightning arrester body II; the silicon rubber is filled in a gap between the resistor disc column and the epoxy glass fiber winding pipe, so that a breathing effect caused by the cavity is prevented, and the reliable sealing performance of the lightning arrester body I and the lightning arrester body II is ensured; the compression spring is used for providing constant axial pressure for the resistance sheets which are superposed and connected in series, so that good contact between the resistance sheets is ensured and the electrical performance requirement is met; the current leading-out component is connected with monitoring devices such as a discharge counter and the like through a leading-out terminal, records the protection action times of the lightning arrester and monitors the running state of the lightning arrester; the insulating cushion block is used for forming insulation between the resistor disc column and a flange connected with a line iron tower cross arm, so that discharge current and leakage current flowing through the resistor disc are ensured to flow to a discharge counter and other monitoring devices through the current leading-out assembly; the end fitting is used for fixing the epoxy glass wire winding pipe, the compression spring and the resistance sheet column inside the epoxy glass wire winding pipe, and forms a complete sealing system with the lightning arrester silicon rubber umbrella sleeve, and meanwhile, the end fitting is mechanically and electrically connected with the line iron tower cross arm and the lightning arrester body II respectively.

The invention has the beneficial effects that:

1. avoid drainage wire jumper windage yaw: the lightning arrester is fixedly connected with a cross arm of a line iron tower and has enough bending strength, so that windage yaw of a current-guiding jumper wire of a 500kV power transmission line under a strong wind meteorological condition can be effectively inhibited, an enough insulation clear distance is ensured, insulation flashover discharge is prevented, and the trip rate is reduced;

2. reliable overvoltage protection capability: reasonably setting the discharge level of the external series gap of the lightning arrester to ensure that the lightning arrester can reliably discharge under the lightning overvoltage, thereby providing stable lightning overvoltage protection performance for a 500kV power transmission line;

3. enough power frequency overvoltage and overvoltage tolerance before slow wave: the external series gap of the lightning arrester is reasonably arranged, and the isolation between a metal oxide resistance card in the lightning arrester body and power frequency overvoltage and slow wave front overvoltage under the worst condition caused by operation or fault on a circuit can be effectively arranged;

4. the maintenance cost is low: the insulation effect of the discharge gap can avoid the aging problem of the resistance card, prolong the service life of the resistance card, basically realize maintenance-free and greatly reduce the maintenance cost;

5. the sealing performance is reliable: the lightning arrester silicon rubber umbrella covers on the first lightning arrester body and the second lightning arrester body and the component silicon rubber umbrella covers on the discharge gap component respectively form reliable sealing systems with flange hardware fittings at two ends of the respective components, so that the insulation of epoxy glass fiber insulation core rods in the first lightning arrester body and the second lightning arrester body and in the discharge gap component is ensured, the epoxy glass fiber insulation core rods are prevented from being damaged by external moisture, silicon rubber is filled in inner gaps of the first lightning arrester body and the second lightning arrester body, the respiration effect is avoided, and the sealing performance is more reliable;

6. the investment is saved: the lightning arrester integrates the functions of a jumper string, a heavy punch piece, a V-shaped insulator string and a conventional line lightning arrester, and can greatly shorten the length of the jumper cross arm, thereby reducing the steel consumption of an iron tower and saving the construction or technical transformation cost.

The wind deflection preventing jumper arrester for the 500kV transmission line has high insulation tightness and safety, can effectively avoid wind deflection of the drainage jumper, integrates the functions of a jumper string, a heavy hammer sheet, a V-shaped insulator string and a conventional line arrester, is low in installation and construction difficulty, and is suitable for popularization and use.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of the internal structure of a first lightning arrester body according to the invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

fig. 4 is a schematic view of the internal structure of a second lightning arrester body according to the invention;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a schematic view of the internal structure of the discharge gap assembly of the present invention;

fig. 7 is a partially enlarged view of fig. 6.

In the figure: 1. a first lightning arrester body; 2. a second lightning arrester body; 3. a discharge gap assembly; 11. a resistor disc column; 12. silicone rubber; 13. an epoxy glass fiber winding tube; 14. a silicon rubber umbrella cover of the lightning arrester; 15. a compression spring; 16. a current drawing assembly; 17. insulating cushion blocks; 18. an end fitting; 31. a body-side flange; 32. an epoxy glass fiber insulation core rod; 33. a silicon rubber umbrella cover is assembled; 34. a discharge gap electrode; 35. wire side connecting plate gold utensil.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-7, a 500kV transmission line uses the lightning arrester of preventing the windage yaw jumper wire, including a lightning arrester body 1, a lightning arrester body 2 and a discharge gap assembly 3, the lightning arrester body 1 and the lightning arrester body 2 have the same specification, the lightning arrester body 1 is connected with one end of the lightning arrester body 2 close to each other, the lightning arrester body 2 is connected with one end of the discharge gap assembly 3 close to each other, the inner side of the lightning arrester body 1 is provided with a resistance sheet column 11, the outer side of the resistance sheet column 11 is provided with an epoxy glass wire winding pipe 13, a gap between the resistance sheet column 11 and the epoxy glass wire winding pipe 13 is filled with silicon rubber 12, the outer side of the epoxy glass wire winding pipe 13 is provided with a lightning arrester silicon rubber umbrella cover 14, the inner parts of both ends of the epoxy glass wire winding pipe 13 are provided with a current leading-out assembly 16 and an insulating cushion block 17, a compression spring 15 is arranged between one end of the resistance sheet column 11 close to the current, the discharge gap assembly 3 comprises a body side flange 31, an epoxy glass fiber insulation core rod 32, an assembly silicon rubber umbrella 33, a discharge gap electrode 34 and a lead side connecting plate fitting 35, the assembly silicon rubber umbrella 33 is arranged on the outer side of the epoxy glass fiber insulation core rod 32 and is integrally compression-molded with the epoxy glass fiber insulation core rod 32, and the lead side connecting plate fitting 35 and the body side flange 31 are fixedly connected to two ends of the epoxy glass fiber insulation core rod 32 respectively.

In this embodiment, one end of the first arrester body 1 is disposed at the ground terminal of the arrester, and the other end is connected to the second arrester body 2, and the difference between the first arrester body 1 and the second arrester body 2 lies in that the resistor disc column 11 inside the first arrester body is electrically isolated from the end fitting 18 of the ground terminal by the insulating spacer 17, and the current flowing through the resistor disc column 11 is led out by the current leading-out component 16 and grounded by the discharge counter monitoring device.

In this embodiment, the second arrester body 2 is arranged between the first arrester body 1 and the discharge gap component 3, one end of the second arrester body is connected with the first arrester body 1, and the other end of the second arrester body is connected with the discharge gap component 3. The difference between the second lightning arrester body 2 and the first lightning arrester body 1 is that the resistor disc column 11 inside the second lightning arrester body is electrically conducted with the end fitting 18 of the grounding terminal, and no current is led out of the terminal.

In this embodiment, the body-side flange 31 of the discharge gap assembly 3 is mechanically and electrically connected to the arrester body 2, the body-side flange 31 is used for fixing the epoxy glass fiber insulating core rod 32 and bearing the mechanical load (including bending load, tensile load, etc.) of the discharge gap assembly 3, and the body-side flange 31 and the silicone rubber umbrella 33 of the assembly outside the epoxy glass fiber insulating core rod 32 form a part of a complete sealing system of the discharge gap assembly 3.

The epoxy glass fiber insulation core rod 32, the body side flange 31 and the wire side connecting plate fitting 35 bear mechanical loads (including bending loads, tensile loads and the like) of the discharge gap assembly 3, and the epoxy glass fiber insulation core rod 32 and the external assembly silicon rubber umbrella 33 provide electrical insulation tolerance (power frequency dry and wet voltage tolerance, lightning impulse voltage tolerance and steep wave impulse voltage tolerance) for the discharge gap assembly 3.

The silicone rubber umbrella 33 of the assembly is integrally molded outside the epoxy glass fiber insulation core rod 32, the silicone rubber umbrella 33 of the assembly, the body side flange 31 and the wire side connecting plate fitting 35 form a complete sealing system of the discharge gap assembly 3, so that the epoxy glass fiber insulation core rod 32 inside the silicone rubber umbrella is ensured not to be affected with damp and has good inner insulation performance and outer insulation performance (including lightning impulse, power frequency humidity voltage resistance and pollution resistance performance), and the requirements of leakage tracking resistance and creepage distance resistance are met.

The discharge gap electrode 34 is composed of a pair of electrodes, an insulator composed of a body side flange 31, an epoxy glass fiber insulation core rod 32 and a component silicon rubber umbrella sleeve 33 is used as a fixed support to ensure that the distance of a discharge gap is constant, the lightning arrester can reliably discharge under the lightning overvoltage through reasonably setting the discharge level of an external series gap, stable lightning overvoltage protection performance is provided, meanwhile, the reasonable arrangement of the metal oxide resistance sheets in the first lightning arrester body 1 and the second lightning arrester body 2 and the isolation between the power frequency overvoltage caused by expected operation and failure and the overvoltage before slow wave under the worst condition on the circuit can be realized, the service life of the lightning arrester is prolonged, the preventive test once in each year is avoided, and the maintenance is basically avoided.

The discharge gap assembly 3 is connected with a 500kV line drainage jumper through a wire side connecting plate fitting 35, namely a connection point of the arrester and the 500kV line, meanwhile, the wire side connecting plate fitting 35 and the body side flange 31 are fixed at two ends of the epoxy glass fiber insulation core rod 32 to bear mechanical loads (including bending loads, tensile loads and the like) of the discharge gap assembly 3, the wire side connecting plate fitting 35, the body side flange 31 and the assembly silicon rubber umbrella sleeve 33 form a complete sealing system of the discharge gap assembly 3, and the epoxy glass fiber insulation core rod 32 inside the discharge gap assembly is ensured not to be affected with damp and has good electrical insulation performance.

In this embodiment, the requirements of the technical conditions of the discharge gap component 3 and the discharge voltage that the arrester should have are as follows: the power frequency withstand voltage is not less than 567kV (effective value), and the 50% discharge voltage of the lightning impulse is not more than 1760kV (peak value); the 50% discharge performance of the lightning impulse of the lightning arrester is matched with the insulation level of a line so as to ensure that the lightning arrester discharges under the overvoltage of the lightning; the power frequency voltage tolerance capability of the lightning arrester is to ensure that the lightning arrester does not discharge under the power frequency overvoltage.

In the embodiment, the lightning arrester body I1, the lightning arrester body II 2 and the discharge gap component 3 are fixedly connected into the integral lightning arrester by adopting flanges, the lightning arrester is arranged at a drainage jumper of an overhead line, a high-voltage end is connected with the line drainage jumper by a line hardware fitting, a low-voltage end flange is fixedly connected with a line iron tower cross arm and does not allow the lightning arrester to swing, so that the high-voltage end drainage jumper is limited to swing greatly along with wind; the arrester also protects the line insulation (including the insulator string and air gap) from lightning induced rapid wave front overvoltage hazards.

In this embodiment, the equal fixedly connected with tip gold utensil 18 in both ends of the two 2 of arrester body 1, and two adjacent tip gold utensils 18 pass through bolt fixed connection, and the one end that the two 2 of arrester body were kept away from to arrester body 1 is passed through tip gold utensil 18 and is linked to each other with 500kV circuit iron tower cross arm, and the one end that the two 2 of arrester body were kept away from to discharge gap subassembly 3 passes through wire side connecting plate gold utensil 35 and links to each other with 500kV circuit drainage wire jumper.

In this embodiment, the resistance card column 11 is formed by stacking and connecting a plurality of groups of nonlinear metal oxide resistance cards in series, the lightning arrester silicon rubber umbrella cover 14 is formed by integral compression molding, and the current leading-out component 16 is connected with a discharge counter monitoring device through a leading-out terminal, records the protection action times of the lightning arrester, and monitors the running state of the lightning arrester.

In the embodiment, the first lightning arrester body 1 is a low-voltage end body component of the lightning arrester, one side of the first lightning arrester body is connected with a 500kV line iron tower cross arm, the other side of the first lightning arrester body is connected with a second lightning arrester body 2, the second lightning arrester body 2 is a high-voltage end body component of the lightning arrester, one side of the second lightning arrester body is connected with the first lightning arrester body 1, and the other side of the second lightning arrester body is connected with the discharge gap component 3; one side of the discharge gap component 3 is connected with the second lightning arrester body 2, and the other side of the discharge gap component is connected with a 500kV line drainage jumper; the lightning arrester body I1 and the lightning arrester body II 2 are both non-linear metal oxide resistance card parts contained in the composite outer sleeve, and are connected with a discharge gap component 3 to form a complete metal oxide lightning arrester with series gaps; the resistance chip column 11 is formed by overlapping and connecting a plurality of nonlinear metal oxide resistance chips in series, an epoxy glass wire winding pipe 13 is arranged outside the resistance chip column 11, and the epoxy glass wire winding pipe 13 is used for fixing the resistance chip column 11 and bearing mechanical loads (including bending loads, tensile loads and the like) of the lightning arrester body I1 and the lightning arrester body II 2; the outside of the epoxy glass fiber winding pipe 13 is provided with an arrester silicon rubber umbrella sleeve 14 which is integrally molded, the arrester silicon rubber umbrella sleeve 14 is used for providing good sealing protection for the internal resistance sheet column 11 and the epoxy glass fiber winding pipe 13 and preventing internal elements from being affected with damp, and meanwhile, the arrester silicon rubber umbrella sleeve 14 also provides the external insulation performance (including lightning impact, power frequency wet withstand voltage and pollution resistance performance) of the arrester body I1 and the arrester body II 2; the silicon rubber 12 is filled in a gap between the resistor disc column 11 and the epoxy glass fiber winding pipe 13 and is used for filling a cavity between the resistor disc column 11 and the epoxy glass fiber winding pipe 13 to prevent the cavity from generating respiration, so that the first lightning arrester body 1 and the second lightning arrester body 2 are ensured to have reliable sealing performance; the compression spring 15 is used for providing constant axial pressure for the superposed and serially connected resistor discs, so that good contact between the resistor discs is ensured and the electrical performance requirement is met; the current leading-out component 16 is connected with monitoring devices such as a discharge counter and the like through a leading-out terminal, records the protection action times of the lightning arrester and monitors the running state of the lightning arrester; the insulating cushion block 17 is used for forming insulation between the resistor disc column 11 and a flange connected with a line iron tower cross arm, and ensuring that discharge current and leakage current flowing through the resistor disc flow to a discharge counter and other monitoring devices through the current leading-out assembly 16; the end fitting 18 is used for fixing the epoxy glass wire winding pipe 13, the compression spring 15 and the resistance sheet column 11 inside the epoxy glass wire winding pipe, and the like to form a complete sealing system with the lightning arrester silicon rubber umbrella sleeve 14, and meanwhile, the end fitting 18 is respectively in mechanical and electrical connection with the line iron tower cross arm and the lightning arrester body II 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.