阅读说明：本技术 一种反冲灭弧绝缘子 (Recoil arc-extinguishing insulator ) 是由 王锟 张清河 徐宇恒 彭斐 黄萍 李继强 王国锋 骆耀敬 王巨丰 王嬿蕾 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种反冲灭弧绝缘子,属于输配电架空线路防雷技术领域,包括若干个绝缘子和连接杆,若干个绝缘子通过连接杆串接构成绝缘子串,其特征在于,绝缘子串两端均设置有反冲灭弧装置,反冲灭弧装置包括导弧电极、导线和端位绝缘子,所述导弧电极设置在外部的连接件上,且通过导线连接到端位绝缘子上。本发明绝缘子灭弧时间提前,由传统的贯穿闪络绝缘配合提前到局部闪络绝缘配合,局部闪络后绝大多数绝缘没有击穿,仅仅出现沿面放电,此时灭弧对象只是极弱冲击电弧的流注,脆弱性高、灭弧难度低。(The invention discloses a recoil arc-extinguishing insulator, which belongs to the technical field of lightning protection of power transmission and distribution overhead lines and comprises a plurality of insulators and connecting rods, wherein the insulators are connected in series through the connecting rods to form an insulator string. The insulator has the advantages that the arc extinguishing time is advanced, the traditional flashover penetrating insulation fit is advanced to the local flashover insulation fit, most of insulation is not broken down after the local flashover, only surface discharge occurs, at the moment, an arc extinguishing object is just the flow of an extremely weak impact arc, the brittleness is high, and the arc extinguishing difficulty is low.)

1. The utility model provides a recoil arc extinguishing insulator, its characterized in that, includes a plurality of insulator (9) and connecting rod (8), and a plurality of insulator (9) concatenate through connecting rod (8) and constitute insulator chain, and its characterized in that, insulator chain both ends all are provided with recoil arc extinguishing device, and recoil arc extinguishing device is including leading arc electrode (10), wire (11) and end position insulator (A), lead arc electrode (10) and set up on the connecting piece of outside, and be connected to on the end position insulator (A) through wire (11).

2. A recoil arc-extinguishing insulator according to claim 1, wherein the end insulator (A) comprises an insulator piece body (1), and an arc inlet (1.1), a plurality of accelerating nozzles (2), a plurality of recoil nozzles (3), a plurality of recoil accelerating arc-extinguishing components (4) and an L-shaped arc-extinguishing component (5) are arranged on the insulator piece body (1);

Advance arc mouth (1.1) and set up in the upper end of insulator piece body (1), accelerate on the side of spout (2) and recoil spout (3) setting at insulator piece body (1), a plurality of recoil is arc extinguishing subassembly (4) and L type arc extinguishing subassembly (5) setting in the inside of insulator piece body (1) with higher speed, and L type arc extinguishing subassembly (5) are connected through setting up connecting wire (7) with recoil with higher speed arc extinguishing subassembly (4), and recoil is connected through connecting wire (7) with higher speed arc extinguishing subassembly (4) and recoil with higher speed arc extinguishing subassembly (4), L type arc extinguishing subassembly (5) set up in the bottom of advancing arc mouth (1.1).

3. A recoil arc extinguishing insulator according to claim 2, wherein: l type arc extinguishing subassembly (5) including vertical recoil pipe (5.1), L type break point lightning electrode (5.2) and bottom acceleration spray tube (5.3), vertical recoil pipe (5.1) vertical setting is in the bottom of advancing arc mouth (1.1), and vertical recoil pipe (5.1) is connected with bottom acceleration spray tube (5.3) is perpendicular, L type break point lightning electrode (5.2) seal sets up the junction of vertical recoil pipe (5.1) and bottom acceleration spray tube (5.3).

4. A recoil arc extinguishing insulator according to claim 3, wherein: the arc inlet (1.1) on the top end of the vertical recoil pipe (5.1) is provided with an arc inlet electrode, the arc inlet electrode is arranged to be a circular metal sheet, the outer diameter of the circular metal sheet is tightly attached to the inner diameter of the arc inlet (1.1) and is connected with an external metal mounting part through a wire, the bottom accelerating spray pipe (5.3) is communicated with an external connector and an accelerating nozzle (2), the accelerating nozzle (2) is provided with a bottom accelerating spray pipe arc striking electrode, and the bottom accelerating spray pipe arc striking electrode is connected with an adjacent recoil accelerating arc extinguishing component (4) through a connecting wire (7).

5. A recoil arc extinguishing insulator according to claim 2, wherein: the recoil acceleration arc extinguishing component (4) comprises a V-shaped arc extinguishing recoil pipe (4.1A), a V-shaped arc extinguishing lightning receiving electrode (4.2A), a V-shaped arc extinguishing acceleration spray pipe (4.3A), a V-shaped arc extinguishing recoil pipe arc striking electrode (4.4A) and a V-shaped arc extinguishing acceleration spray pipe arc striking electrode (4.5A), the V-shaped arc extinguishing recoil pipe (4.1A) is communicated with the V-shaped arc extinguishing acceleration spray pipe (4.3A) and forms a V-shaped structure, the V-shaped structure is horizontally arranged in the insulator sheet body (1), the V-shaped arc extinguishing lightning receiving electrode (4.2A) is hermetically arranged at the joint of the V-shaped arc extinguishing recoil pipe (4.1A) and the V-shaped arc extinguishing acceleration spray pipe (4.3A), the V-shaped recoil pipe (4.1A) is communicated with the recoil nozzle (3), and the V-shaped recoil pipe arc striking electrode (4.4A) is arranged on the inner side of the recoil nozzle (3) and is connected with the recoil acceleration arc extinguishing component (4) or the front arc extinguishing component (5) through a recoil connecting wire (7), v type arc extinguishing accelerates spray tube (4.3A) and accelerates spout (2) intercommunication, and accelerates spout (2) inside and be provided with V type arc extinguishing and accelerate spray tube arc ignition electrode (4.5A), and V type arc extinguishing accelerates spray tube arc ignition electrode (4.5A) and is connected with next recoil acceleration arc extinguishing subassembly (4) through connecting wire (7).

6. A recoil arc extinguishing insulator according to claim 2, wherein: the recoil acceleration arc extinguishing component (4) comprises a combined arc extinguishing recoil pipe (4.1B), a combined arc extinguishing lightning receiving electrode (4.2B), a combined arc extinguishing acceleration spray pipe (4.3B), a combined arc extinguishing recoil pipe arc striking electrode (4.4B) and a combined arc extinguishing acceleration spray pipe arc striking electrode (4.5B), wherein the combined arc extinguishing recoil pipe (4.1B) is communicated with the combined arc extinguishing acceleration spray pipe (4.3B), the combined arc extinguishing lightning receiving electrode (4.2B) is hermetically arranged at the joint of the combined arc extinguishing recoil pipe (4.1B) and the combined arc extinguishing acceleration spray pipe (4.3B), the combined arc extinguishing recoil pipe (4.1B) is arranged into a straight pipe structure, the combined arc extinguishing recoil pipe (4.1B) is communicated with the recoil acceleration spray pipe (3), the combined arc extinguishing recoil pipe arc striking electrode (4.4B) is arranged in the recoil spray nozzle (3), and the combined arc extinguishing recoil pipe arc striking electrode (4.4B) is connected with the previous spray nozzle acceleration component (4) or the previous spray nozzle (4L) through a connecting wire (7) The assembly (5) is connected, the combined arc extinguishing accelerating spray pipe (4.3B) is arranged to be an arc-shaped pipe, the combined arc extinguishing accelerating spray pipe (4.3B) is communicated with the accelerating nozzle (2), and the arc striking electrode (4.5B) of the combined arc extinguishing accelerating spray pipe is arranged in the accelerating nozzle (2) and is connected with the next recoil accelerating arc extinguishing assembly (4) through a connecting wire (7).

7. A recoil arc extinguishing insulator according to claim 2, wherein: the backflushing and accelerating arc extinguishing assembly (4) comprises a U-shaped arc extinguishing recoil pipe (4.1C), a U-shaped arc extinguishing flashing electrode (4.2C), a U-shaped arc extinguishing accelerating spray pipe (4.3C), a U-shaped arc extinguishing recoil pipe arc striking electrode (4.4C) and a U-shaped arc extinguishing accelerating spray pipe arc striking electrode (4.5C), wherein the U-shaped arc extinguishing recoil pipe (4.1C) and the U-shaped arc extinguishing accelerating spray pipe (4.3C) are communicated to form a U-shaped structure, an opening of the U-shaped structure points to the outer side of the insulator sheet body (1), the U-shaped arc extinguishing flashing electrode (4.2C) is hermetically arranged at the joint of the U-shaped arc extinguishing recoil pipe (4.1C) and the U-shaped arc extinguishing accelerating spray pipe (4.3C), the U-shaped arc extinguishing recoil pipe (4.1C) is communicated with the U-shaped arc striking electrode (4.4C) of the U-shaped arc extinguishing recoil pipe arc striking nozzle (3), and the U-shaped arc extinguishing recoil pipe arc striking electrode (4.4C) is arranged in a backflushing electrode group (4.4) through a connecting wire, and a U-shaped arc extinguishing flashover-shaped arc striking electrode (7 Piece (4) or L type arc extinguishing subassembly (5) are connected, spray tube (4.3C) is set up to half "U" type pipe with higher speed to U type arc extinguishing, and spray tube (4.3C) and spout (2) intercommunication with higher speed are accelerated to U type arc extinguishing, and U type arc extinguishing sets up in spout (2) with higher speed spray tube arc striking electrode (4.5C), is connected with next recoil arc extinguishing subassembly (4) with higher speed through connecting wire (7).

8. A recoil arc extinguishing insulator according to claim 2, wherein: the side walls of the plurality of backflushing acceleration arc extinguishing assemblies (4) and the L-shaped arc extinguishing assembly (5) are made of high-strength, high-temperature-resistant and high-pressure-resistant non-conductive materials, the non-conductive materials are made of alloy ceramics, rare earth ceramics, graphene-ceramic composite materials, organic ceramics, synthetic silicone rubber, organic insulating materials, alloy glass, rare earth glass, graphene glass or organic glass, and the inner diameter of the plurality of backflushing acceleration arc extinguishing assemblies (4) and the inner diameter of the L-shaped arc extinguishing assembly (5) are increased along with the voltage grade rise of the power transmission line.

Technical Field

The invention relates to the technical field of lightning protection of power transmission and distribution overhead lines, in particular to a recoil arc-extinguishing insulator.

Background

When the clouds aggregate to form a difference between the clouds and earth, a very non-uniform electric field is always induced at the insulator. Research shows that the distribution of the electric field intensity among different pieces of insulators is also very uneven when lightning strike occurs, and the electric field intensity of the insulator pieces at two ends of the insulator string is high, and the electric field intensity of the middle part of the insulator string is low. Because the electric field intensity of the insulators at the first end and the last end is high, the electric field intensity of the middle part of the insulator is low, lightning flashover arcs firstly appear at the two ends of the insulator string, and then the lightning flashover arcs develop from the two ends of the insulator string to the middle part.

The lightning arrester and the parallel gap widely adopted in the power line nowadays mainly intervene when lightning stroke occurs, and the traditional lightning arrester has many defects, such as: difficult maintenance, low lightning protection effect, incapability of protecting superposed lightning stroke and the like. The parallel gap also has a number of disadvantages, such as: (1) the parallel gap installation needs additional hardware fittings, and the installation has certain difficulty; (2) the insulation matching of the parallel gap is designed according to the highest breakdown voltage of the head and tail insulators of the insulator string, and partial discharge firstly occurs at the head end and the tail end, so that the insulation matching ratio of the parallel gap needs to be low, the insulation level of a line can be reduced, and the lightning trip-out rate is increased; (3) the parallel gap electrode is burnt by power frequency follow current electric arc for many times, which can lead to the ablation of the metal electrode and reduce the insulation matching capability of the parallel gap and the insulator.

Aiming at the defects of the lightning arrester and the parallel gap, the serial recoil arc-extinguishing insulator applied to the lightning protection of the power transmission line is provided.

disclosure of Invention

The invention aims to provide a recoil arc-extinguishing insulator to solve the technical problems in the background technology.

The utility model provides a recoil arc extinguishing insulator, includes a plurality of insulator and connecting rod, and a plurality of insulator concatenates through the connecting rod and constitutes insulator chain, its characterized in that, insulator chain both ends all are provided with recoil arc control device, and recoil arc control device is including leading arc electrode, wire and end position insulator, lead the arc electrode setting on the connecting piece of outside, and be connected to on the end position insulator through the wire.

The end insulator comprises an insulator piece body, and an arc inlet, a plurality of accelerating nozzles, a plurality of backflushing accelerating arc extinguishing assemblies and an L-shaped arc extinguishing assembly are arranged on the insulator piece body;

The arc inlet is arranged at the upper end of the insulator piece body, the accelerating nozzle and the backflushing nozzle are arranged on the side edge of the insulator piece body, the plurality of backflushing accelerating arc extinguishing assembly and the L-shaped arc extinguishing assembly are arranged inside the insulator piece body, the L-shaped arc extinguishing assembly and the backflushing accelerating arc extinguishing assembly are connected through a connecting wire, the backflushing accelerating arc extinguishing assembly and the backflushing accelerating arc extinguishing assembly are connected through a connecting wire, and the L-shaped arc extinguishing assembly is arranged at the bottom of the arc inlet.

Further, L type arc extinguishing subassembly includes vertical recoil pipe, L type break point meets and dodges electrode and the accelerated spray tube in bottom, the vertical setting of vertical recoil pipe is in the bottom of advancing the arc mouth, and vertical recoil pipe is connected with the bottom is with higher speed the spray tube perpendicularly, L type break point meets and dodges the sealed junction that sets up at vertical recoil pipe and the accelerated spray tube in bottom of electrode.

Further, the arc inlet on the top end of the vertical recoil pipe is provided with an arc inlet electrode, the arc inlet electrode is arranged to be a circular metal sheet, the outer diameter of the circular metal sheet is tightly attached to the inner diameter of the arc inlet and is connected with an external metal mounting part through a wire, the bottom accelerating spray pipe is communicated with an external connector and an accelerating nozzle, the accelerating nozzle is provided with a bottom accelerating spray pipe arc striking electrode, and the bottom accelerating spray pipe arc striking electrode is connected with an adjacent recoil accelerating arc extinguishing component through a connecting wire.

further, the recoil acceleration arc extinguishing component comprises a V-shaped arc extinguishing recoil pipe, a V-shaped arc extinguishing lightning receiving electrode, a V-shaped arc extinguishing acceleration spray pipe, a V-shaped arc extinguishing recoil pipe arc striking electrode and a V-shaped arc extinguishing acceleration spray pipe arc striking electrode, the V-shaped arc extinguishing recoil pipe is communicated with the V-shaped arc extinguishing acceleration spray pipe and forms a V-shaped structure, the V-shaped structure is horizontally arranged in the insulator sheet body, the V-shaped arc extinguishing lightning receiving electrode is hermetically arranged at the joint of the V-shaped arc extinguishing recoil pipe and the V-shaped arc extinguishing acceleration spray pipe, the V-shaped arc extinguishing recoil pipe is communicated with the spray nozzle, the V-shaped arc extinguishing recoil pipe arc striking electrode is arranged on the inner side of the recoil spray nozzle and is connected with the previous acceleration recoil arc extinguishing component or the L-shaped arc extinguishing component through a connecting wire, the V-shaped arc extinguishing acceleration spray pipe is communicated with the acceleration spray nozzle, and the V-shaped arc striking electrode is arranged in the, and the arc striking electrode of the V-shaped arc extinguishing accelerating spray pipe is connected with the next recoil accelerating arc extinguishing component through a connecting wire.

Further, the recoil acceleration arc extinguishing component comprises a combined arc extinguishing recoil pipe, a combined arc extinguishing lightning receiving electrode, a combined arc extinguishing acceleration spray pipe, a combined arc extinguishing recoil pipe arc striking electrode and a combined arc extinguishing acceleration spray pipe arc striking electrode, wherein the combined arc extinguishing recoil pipe is communicated with the combined arc extinguishing acceleration spray pipe, the combined arc extinguishing lightning receiving electrode is hermetically arranged at the joint of the combined arc extinguishing recoil pipe and the combined arc extinguishing acceleration spray pipe, the combined arc extinguishing recoil pipe is of a straight pipe structure and is communicated with the recoil nozzle, the combined arc extinguishing recoil pipe arc striking electrode is arranged in the recoil nozzle, the combined arc extinguishing recoil pipe arc striking electrode is connected with the previous recoil acceleration arc extinguishing component or the L-shaped arc extinguishing component through a connecting wire, the combined arc extinguishing acceleration spray pipe is arranged as an arc pipe, and is communicated with the acceleration nozzle, and the arc striking electrode of the combined arc extinguishing accelerating nozzle is arranged in the accelerating nozzle and is connected with the next recoil accelerating arc extinguishing component through a connecting wire.

Further, the recoil acceleration arc extinguishing component comprises a U-shaped arc extinguishing recoil pipe, a U-shaped arc extinguishing flashover electrode, a U-shaped arc extinguishing acceleration spray pipe, a U-shaped arc extinguishing recoil pipe arc striking electrode and a U-shaped arc extinguishing acceleration spray pipe arc striking electrode, the U-shaped arc extinguishing recoil pipe and the U-shaped arc extinguishing acceleration spray pipe are communicated to form a U-shaped structure, an opening of the U-shaped structure points to the outer side of the insulator sheet body, the U-shaped arc extinguishing flashover electrode is hermetically arranged at the joint of the U-shaped arc extinguishing recoil pipe and the U-shaped arc extinguishing acceleration spray pipe, the U-shaped arc extinguishing recoil pipe is communicated with an arc striking electrode nozzle of the U-shaped arc extinguishing recoil pipe arc striking nozzle, the U-shaped arc extinguishing recoil pipe arc striking electrode is arranged in the recoil nozzle, the U-shaped recoil arc extinguishing pipe arc striking electrode is connected with the previous recoil acceleration arc extinguishing component (4) or the L-shaped arc extinguishing component through a connecting wire, and the U-shaped recoil acceleration, the U-shaped arc extinguishing accelerating spray pipe is communicated with the accelerating nozzle, and an arc striking electrode of the U-shaped arc extinguishing accelerating spray pipe is arranged in the accelerating nozzle and is connected with the next backflushing accelerating arc extinguishing assembly through a connecting wire.

Furthermore, the side walls of the plurality of backflushing acceleration arc extinguishing assemblies and the L-shaped arc extinguishing assembly are made of high-strength, high-temperature-resistant and high-pressure-resistant non-conductive materials, the non-conductive materials are made of alloy ceramics, rare earth ceramics, graphene-ceramic composite materials, organic ceramics, synthetic silicon rubber, organic insulating materials, alloy glass, rare earth glass, graphene glass or organic glass, and the inner diameters of the plurality of backflushing acceleration arc extinguishing assemblies and the L-shaped arc extinguishing assembly are increased along with the increase of the voltage grade of the power transmission line.

By adopting the technical scheme, the invention has the following technical effects:

(1) The insulator has the advantages that the arc extinguishing time is advanced, the traditional flashover penetrating insulation fit is advanced to the local flashover insulation fit, most of insulation is not broken down after the local flashover, only surface discharge occurs, at the moment, an arc extinguishing object is just the flow of an extremely weak impact arc, the brittleness is high, and the arc extinguishing difficulty is low.

(2) Arc extinction is easier, an arc building channel belongs to a non-through channel, and damping is huge.

(3) The re-ignition is more difficult, the medium recovery is faster once the weak arcing is interrupted, the arc path vulnerability is greater, and the deionization area is larger.

(4) The arc extinguishing module has the advantage of safety, and flashover caused by power frequency overvoltage is also extinguished in the partial discharge stage. The arc extinguishing module can be prevented from being damaged by large energy, the range of the arc extinguishing module for suppressing overvoltage and the durability of the arc extinguishing module are improved, and the requirement of the arc extinguishing capability of pure power frequency overvoltage is completely met.

(5) The arc extinguishing module and the insulator string are integrated, so that the installation is simple and the economical efficiency is high.

Drawings

Fig. 1 is a schematic view of the structure of the insulator of the present invention.

FIG. 2 is a schematic view of the external structure of the insulator sheet of the present invention.

Fig. 3 is a cross-sectional view of a first construction of an insulator sheet according to the present invention.

Fig. 4 is an internal structural view of a first structure of an insulator sheet according to the present invention.

Fig. 5 is a schematic structural diagram of a recoil acceleration arc extinguishing assembly of a first structure of the insulator sheet according to the invention.

Fig. 6 is an internal structural view of a second structure of an insulator sheet according to the present invention.

Fig. 7 is a schematic structural diagram of a recoil acceleration arc extinguishing assembly of a second structure of the insulator sheet according to the invention.

Fig. 8 is an internal structural view of a third structure of an insulator sheet according to the present invention.

Fig. 9 is a schematic structural diagram of a third structure of a recoil acceleration arc extinguishing assembly of the insulator piece of the invention.

fig. 10 is a schematic structural diagram of an L-shaped arc extinguishing assembly according to the present invention.

fig. 11 is a schematic diagram of a recoil arc extinguishing channel of the present invention.

In the figure: 1-an insulator sheet body; 1.1-an arc inlet; 2-accelerating nozzle; 3-backflushing the nozzle; 4-recoil accelerating arc extinguishing components; 5-L-shaped arc extinguishing components; 5.1-vertical back flushing pipe; 5.2-L-shaped break point lightning receiving electrode; 5.3-bottom accelerating jet pipe; 6-end single-bounce arc tube; 7-connecting lines; 4.1A-V type arc extinguishing recoil pipe; 4.2A-V type arc extinguishing lightning receiving electrode; 4.3A-V type arc extinguishing accelerating nozzle; 4.4A-V arc extinguishing recoil tube arc striking electrode; 4.5A-V type arc extinguishing accelerating nozzle arc striking electrode; 4.1B-Combined arc extinguishing recoil pipe; 4.2B-combined arc extinguishing lightning receiving electrode; 4.3B-combined arc extinguishing accelerating nozzle; 4.4B-combined arc extinguishing recoil tube arc striking electrode; 4.5B-combined arc extinguishing accelerating nozzle arc striking electrode; 4.1C-U arc extinguishing recoil tube; 4.2C-U arc extinguishing lightning receiving electrode; 4.3C-U type arc extinguishing accelerating nozzle; 4.4C-U arc extinguishing recoil tube arc striking electrode; 4.5C-U arc extinguishing accelerating nozzle arc striking electrode; 8-a connecting rod; 9-an insulator; 10-a conductive arc electrode; 11-a wire; a-terminal insulator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

An embodiment of the invention is further described in accordance with the above-described principle description and with reference to fig. 1:

The utility model provides a recoil arc extinguishing insulator, includes a plurality of insulator 9 and connecting rod 8, and a plurality of insulator 9 concatenates through connecting rod 8 and constitutes the insulator chain, and its characterized in that, insulator chain both ends all are provided with recoil arc extinguishing device, and recoil arc extinguishing device is including leading arc electrode 10, wire 11 and end position insulator A, lead arc electrode 10 and set up on the connecting piece of outside, and be connected to on the end position insulator A through wire 11.

As shown in fig. 1, the first and last insulators of the insulator string, that is, the end insulator a, as the 1 st and 7 th insulators in fig. 1, have high local field strength and are easy to preferentially flashover, so that two insulators with large areas are designed at the first and last ends of the insulator string, and the first and last insulators are provided with the back-flushing arc-extinguishing devices for protecting the first and last ends of the insulator string. The recoil arc-extinguishing device can be formed by reserving a space inside the manufactured end insulator A or by later-stage hole turning and the like. At the leading stage of thunder and lightning discharge, to inhomogeneous electric field partial discharge characteristic part, two great insulators of area (1 st, 7 th) are designed at the first and last both ends of insulator string, install recoil arc extinguishing device in two first and last insulators, it is insulating to run through flashover insulation cooperation to the partial flashover in advance with traditional, the realization is effectively extinguished to the partial discharge electric arc, thereby eliminate the basic condition that develops into main discharge from partial discharge, greatly reduce the arc extinguishing degree of difficulty, eliminate thunderbolt flashover and build the arc harm, ensure that the thunderbolt does not trip.

Firstly, after lightning strike, lightning is transmitted to the arc-conducting electrode 3 through an external metal connecting piece, and the arc is transmitted to the end insulator A by the arc-conducting electrode 3 through the lead 11 for recoil arc extinction.

As shown in fig. 1, arc-guiding electrodes 10 are respectively arranged at the head end and the tail end of the insulator string, and the arc-guiding electrodes 10 are respectively sleeved at the head end and the tail end of the insulator string and are in contact with the outer metal wall at the head end and the tail end of the insulator. The arc-guiding electrode 10 is made of metal material and is respectively connected with the recoil arc-extinguishing devices in the insulators at the first end and the last end through a lead 11. Function of the arc-guiding electrode 10: when lightning flashover arcs occur near the insulator, the arc guide electrode 3 can drag the nearby arcs into the recoil arc extinguishing devices of the insulator pieces at the two ends. The diameter of the end insulator A is larger than that of the other insulators in the middle, and the end insulators are covered by the diameters of the two ends, so that arc extinguishing effects of the two ends can be achieved.

As shown in fig. 2, the end insulator a includes an insulator segment body 1, and is characterized in that an arc inlet 1.1, a plurality of accelerating nozzles 2, a plurality of backflushing nozzles 3, a plurality of backflushing accelerating arc extinguishing assemblies 4, and an L-shaped arc extinguishing assembly 5 are arranged on the insulator segment body 1. Advance arc mouth 1.1 setting in the upper end of insulator piece body 1, spout 2 and recoil spout 3 setting on the side of insulator piece body 1 with higher speed, a plurality of recoil is arc extinguishing subassembly 4 with higher speed and L type arc extinguishing subassembly 5 sets up in the inside of insulator piece body 1, and L type arc extinguishing subassembly 5 is connected through setting up connecting wire 7 with recoil with higher speed arc extinguishing subassembly 4, and recoil is arc extinguishing subassembly 4 with higher speed and is connected through connecting wire 7 with recoil with higher speed arc extinguishing subassembly 4, L type arc extinguishing subassembly 5 sets up in the bottom of entering arc mouth 1.1.

After the thunderbolt, the thunder and lightning advances arc mouth 1.1 from the wire conduction, then through L type arc extinguishing subassembly 5 with recoil acceleration arc extinguishing subassembly 4 recoil and spout with higher speed for multistage recoil offset, toward the outside air multiple spot blowout with higher speed simultaneously, the better weakens electric arc, can reach the effect of better arc extinguishing. The lightning receiving electrodes are all of a metal spherical structure and have the function of conducting electricity.

As shown in fig. 4 and 10, the L-shaped arc extinguishing assembly 5 includes a vertical recoil pipe 5.1, an L-shaped breakpoint lightning contact electrode 5.2 and a bottom accelerating nozzle 5.3. The vertical recoil pipe 5.1 is vertically arranged at the bottom of the arc inlet 1.1, and the vertical recoil pipe 5.1 is vertically connected with the bottom accelerating jet pipe 5.3. The L-shaped break point lightning receiving electrode 5.2 is hermetically arranged at the joint of the vertical recoil pipe 5.1 and the bottom accelerating spray pipe 5.3. The arc inlet 1.1 on the top end of the vertical recoil pipe 5.1 is provided with an arc inlet electrode, the arc inlet electrode is arranged to be a circular metal sheet, the outer diameter of the circular metal sheet is tightly attached to the inner diameter of the arc inlet 1.1 and is connected with an external metal mounting part through a wire, the bottom accelerating spray pipe 5.3 is communicated with an external connector and an accelerating nozzle 2, the accelerating nozzle 2 is provided with a bottom accelerating spray pipe arc striking electrode, and the bottom accelerating spray pipe arc striking electrode is connected with an adjacent recoil accelerating arc extinguishing component 4 through a connecting wire 7.

During lightning stroke, high voltage is conducted into the arc electrode through a lead, then an electric arc is formed on the arc electrode, and recoil hedging is formed in the vertical recoil pipe 5.1, and the specific principle is shown in figure 10. A part of the electric arc is conducted to the bottom accelerating spray pipe 5.3 through the L-shaped break-point lightning receiving electrode 5.2, then the electric arc forms an accelerating process in the bottom accelerating spray pipe 5.3, then a part of the electric arc is sprayed out from the accelerating spray nozzle 2 of the bottom accelerating spray pipe 5.3, and the rest part of the electric arc is conducted to the recoil accelerating arc-extinguishing component 4 through a wire.

The side walls of the plurality of backflushing acceleration arc extinguishing assemblies 4 and the L-shaped arc extinguishing assembly 5 are made of high-strength, high-temperature-resistant and high-pressure-resistant non-conductive materials, the non-conductive materials are made of alloy ceramics, rare earth ceramics, graphene-ceramic composite materials, organic ceramics, synthetic silicon rubber, organic insulating materials, alloy glass, rare earth glass, graphene glass or organic glass, and the inner diameters of the plurality of backflushing acceleration arc extinguishing assemblies 4 and the L-shaped arc extinguishing assembly 5 are increased along with the increase of the voltage grade of the power transmission line.

As shown in fig. 3-5, the recoil acceleration and arc extinguishing assembly 4 comprises a V-shaped arc extinguishing recoil pipe 4.1A, V type arc extinguishing flashover electrode 4.2A, V type arc extinguishing flashover pipe 4.3A, V type arc extinguishing flashover pipe arc striking electrode 4.4A and a V-shaped arc extinguishing acceleration nozzle arc striking electrode 4.5A, the V-shaped arc extinguishing recoil pipe 4.1A is communicated with the V-shaped arc extinguishing acceleration nozzle pipe 4.3A and forms a V-shaped structure, the V-shaped structure is horizontally arranged in the insulator plate body 1, the V-shaped arc extinguishing flashover electrode 4.2A is hermetically arranged at the joint of the V-shaped arc extinguishing recoil pipe 4.1A and the V-shaped arc extinguishing acceleration nozzle pipe 4.3A, the V-shaped arc extinguishing recoil pipe 4.1A is communicated with the recoil acceleration nozzle 3, the V-shaped recoil nozzle arc striking electrode 4.4A is arranged on the inner side of the recoil nozzle 3 and is connected with the previous recoil acceleration nozzle assembly 4 or L-shaped arc extinguishing assembly 5 through a connecting wire 7, the V-shaped recoil acceleration nozzle 4.3A is communicated with the acceleration nozzle 4.2, and the inner part of the accelerating nozzle 2 is provided with a V-shaped arc extinguishing accelerating nozzle arc striking electrode 4.5A, and the V-shaped arc extinguishing accelerating nozzle arc striking electrode 4.5A is connected with the next recoil accelerating arc extinguishing component 4 through a connecting wire 7.

The end of the recoil acceleration arc extinguishing component 4 is also provided with a tail end single-recoil arc extinguishing tube 6, one end of the tail end single-recoil arc extinguishing tube 6 is opened, one end of the tail end single-recoil arc extinguishing tube is closed and arranged, and the closed end is provided with a lightning receiving electrode, so that the electric arc weakened through multiple layers is extinguished through the tail end recoil of the tail end single-recoil arc extinguishing tube 6.

The electric arc is weakened by the L-shaped arc extinguishing component 5 and then enters the recoil accelerating arc extinguishing component 4 with a V-shaped structure to be weakened one by one. Each recoil accelerating arc-extinguishing component 4 carries out recoil hedging and then is sprayed out in an accelerating way, so that the effect that each recoil accelerating arc-extinguishing component 4 carries out secondary arc-extinguishing is achieved. The V-shaped arc extinguishing recoil pipe 4.1A and the V-shaped arc extinguishing accelerating nozzle 4.3A are both set to be straight pipe structures, so that recoil hedging is carried out in the V-shaped arc extinguishing recoil pipe 4.1A, and the specific recoil process is shown in figure 10.

As shown in fig. 6-7, the back-flushing accelerating arc-extinguishing component 4 includes a combined arc-extinguishing back-flushing pipe 4.1B, a combined arc-extinguishing flash-receiving electrode 4.2B, a combined arc-extinguishing accelerating nozzle 4.3B, a combined arc-extinguishing back-flushing pipe arc-striking electrode 4.4B, and a combined arc-extinguishing accelerating nozzle arc-striking electrode 4.5B, the combined arc-extinguishing back-flushing pipe 4.1B is communicated with the combined arc-extinguishing accelerating nozzle 4.3B, and the combined arc-extinguishing flash-receiving electrode 4.2B is hermetically arranged at the joint of the combined arc-extinguishing back-flushing pipe 4.1B and the combined arc-extinguishing accelerating nozzle 4.3B, the combined arc-extinguishing back-flushing pipe 4.1B is arranged in a straight pipe structure, the combined arc-extinguishing back-flushing pipe 4.1B is communicated with the back-flushing nozzle 3, and the combined arc-extinguishing back-flushing pipe arc-striking electrode 4.4B is arranged in the back-flushing nozzle 3, the combined back-flushing pipe arc-flushing nozzle arc-, the combined arc extinguishing accelerating spray pipe 4.3B is set to be an arc-shaped pipe, the combined arc extinguishing accelerating spray pipe 4.3B is communicated with the accelerating nozzle 2, and an arc striking electrode 4.5B of the combined arc extinguishing accelerating spray pipe is arranged in the accelerating nozzle 2 and is connected with the next backflushing accelerating arc extinguishing assembly 4 through a connecting wire 7.

The recoil arc extinguishing process of the combined arc extinguishing recoil pipe 4.1B is the same as the recoil hedging arc extinguishing process of the V-shaped arc extinguishing recoil pipe 4.1A. The combined arc extinguishing accelerating nozzle 4.3B is arranged into an arc-shaped structure, so that the arc is extruded and collided with the side wall more in the arc-shaped pipe, the temperature is increased more quickly, and the spraying force of the generated spraying port is larger.

As shown in fig. 8-9, the recoil acceleration arc-extinguishing component 4 comprises a U-shaped arc-extinguishing recoil pipe 4.1C, U type arc-extinguishing flashover electrode 4.2C, U type arc-extinguishing acceleration nozzle 4.3C, U type arc-extinguishing recoil pipe arc-striking electrode 4.4C and a U-shaped arc-extinguishing acceleration nozzle arc-striking electrode 4.5C, the U-shaped arc-extinguishing recoil pipe 4.1C and the U-shaped arc-extinguishing acceleration nozzle 4.3C are communicated to form a "U" type structure, the opening of the "U" type structure is directed to the outer side of the insulator plate body 1, the U-shaped arc-extinguishing flashover electrode 4.2C is hermetically arranged at the joint of the U-shaped arc-extinguishing recoil pipe 4.1C and the U-shaped arc-extinguishing acceleration nozzle 4.3C, the U-shaped arc-extinguishing recoil pipe arc-extinguishing flashover electrode 4.4C is communicated with the U-shaped arc-extinguishing recoil pipe arc-striking electrode 4.4C, and the U-shaped recoil pipe arc-extinguishing flashover electrode 4.4C is connected with the recoil-extinguishing acceleration nozzle 3 through a recoil assembly 7 or a front arc-extinguishing acceleration nozzle assembly 5, u type arc extinguishing is spray tube 4.3C with higher speed sets up to half "U" type pipe, and U type arc extinguishing is spray tube 4.3C with higher speed and is spout 2 intercommunication with higher speed, and U type arc extinguishing is spray tube arc striking electrode 4.5C with higher speed sets up in spout 2 with higher speed, is connected with next recoil arc extinguishing subassembly 4 with higher speed through connecting wire 7.

U type arc extinguishing recoil pipe 4.1C and U type arc extinguishing are all set up to half "U" structure with higher speed spray tube 4.3C, then be the arc structure, make electric arc when getting into, and the number of times of friction between the lateral wall and collision is more, the temperature risees sooner, accumulate more energy, make the recoil that forms in U type arc extinguishing recoil pipe 4.1C more violent to dashing, it is faster to carry out the speed of recoil in U type arc extinguishing with higher speed spray tube 4.3C, the effect of arc extinguishing is better.

As shown in FIG. 11, the outer arc may be defined as having a velocity v0 at the inlet, a pressure p0, a density ρ 0, and a temperature T0. After the outer arc enters the recoil assembly, an inlet arc velocity v1, a pressure p1, a density ρ 1 and a temperature T1 are formed. After passing through the arc striking assembly, the outlet arc speed v2 is p2, the pressure is p2, and the temperature is T2. The outer arc enters the recoil assembly through the inlet to form an inner arc, the inner arc is limited by the recoil assembly wall, the diameter is mechanically compressed by a large scale, and the temperature, the density, the pressure and the speed of the inner arc are all increased. Regardless of arc energy loss and friction effects, when the inlet arc passes the compression electrode to achieve a resilient impact moment, v1 is considered to be-v 2, i.e., the inlet arc velocity is equal in magnitude and opposite in direction to the outlet velocity. Considering the energy loss and friction of the arc, when the inlet arc collides with the compressive electrode, it is considered that | v2 | v1 | that the outlet velocity is smaller than the inlet velocity and the direction is opposite. The outlet arc is impeded by the inlet arc, which is smaller in diameter than the inlet arc, so that the outlet arc has a greater density, temperature and pressure than the inlet arc, i.e. ρ 2 > ρ 1, T2 > T1, p2 > p1, which in combination accelerate v2 more than v1, i.e. a2 > a 1. As the outlet arc diameter is increasingly compressed, resulting in an increase in outlet arc density, temperature and pressure, v2 > v1 eventually causes the outlet arc to rush out of the recoil assembly from the inlet. After the electric arc at the outlet rushes out of the recoil component, a cavity effect is formed on the external electric arc, the continuity of the electric arc is damaged, the energy of the electric arc is weakened, and the cutting and extinguishing of the electric arc are accelerated.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.