阅读说明：本技术 无空气间隙的半封闭式双反冲灭弧防雷装置及其应用 (Semi-closed double-recoil arc extinguishing lightning protection device without air gap and application thereof ) 是由 王巨丰 王嬿蕾 李心如 唐佳雄 徐宇恒 于 2019-04-16 设计创作，主要内容包括：本发明公开了一种无空气间隙的半封闭式双反冲灭弧防雷装置及其应用,主要包括灭弧体和反冲灭弧组件,灭弧体内部为中空结构,并且在灭弧体内部中间位置还纵向设有隔板,所述隔板把灭弧体的内部空间分隔成两组反冲灌注灭弧通道；在左侧的反冲灌注灭弧通道的上端固定安装一个反冲灭弧组件,下端为向灭弧体侧面延伸设置的反冲喷口；在右侧的反冲灌注灭弧通道的上端为向灭弧体侧面延伸设置的反冲喷口,下端固定安装一个反冲灭弧组件。本发明能够约束并管控电弧路径,消除电弧漂移的危害,而且使用范围广,一次安装,可长期重复使用,运行成本低,灵敏性高,有利于电力安全生产。(The invention discloses a semi-closed double-recoil arc extinguishing lightning protection device without an air gap and application thereof, mainly comprising an arc extinguishing body and a recoil arc extinguishing assembly, wherein the interior of the arc extinguishing body is of a hollow structure, and a partition plate is longitudinally arranged at the middle position in the interior of the arc extinguishing body and divides the interior space of the arc extinguishing body into two groups of recoil perfusion arc extinguishing channels; a recoil arc extinguishing component is fixedly installed at the upper end of the recoil perfusion arc extinguishing channel on the left side, and a recoil nozzle extending towards the side surface of the arc extinguishing body is arranged at the lower end of the recoil perfusion arc extinguishing channel; the upper end of the back-flushing pouring arc extinguishing channel on the right side is a back-flushing nozzle extending to the side face of the arc extinguishing body, and a back-flushing arc extinguishing component is fixedly installed at the lower end of the back-flushing pouring arc extinguishing channel. The invention can restrict and control the arc path, eliminate the harm of arc drift, has wide application range, one-time installation, long-term reuse, low operation cost and high sensitivity, and is beneficial to the safe production of electric power.)

1. A semi-closed double-recoil arc extinguishing lightning protection device without air gaps comprises an arc extinguishing body (4) and a recoil arc extinguishing assembly (5); the method is characterized in that: the interior of the arc extinguishing body (4) is of a hollow structure, a partition plate (8) is further longitudinally arranged at the middle position in the arc extinguishing body, the partition plate (8) divides the interior space of the arc extinguishing body (4) into two backflushing pouring arc extinguishing channels (9), and a wall electrode (7) is arranged on the partition plate (8); a recoil arc extinguishing component is fixedly installed at the upper end of the recoil perfusion arc extinguishing channel on the left side, and a recoil nozzle extending towards the side surface of the arc extinguishing body is arranged at the lower end of the recoil perfusion arc extinguishing channel; the upper end of the back-flushing pouring arc extinguishing channel on the right side is provided with a back-flushing nozzle extending to the side surface of the arc extinguishing body, and the lower end of the back-flushing arc extinguishing channel is fixedly provided with a back-flushing arc extinguishing assembly; and an arc striking electrode (14) is also arranged on the recoil arc extinguishing component.

2. The air gap-free semi-closed double-recoil arc extinguishing lightning protection device according to claim 1, characterized in that: the recoil arc extinguishing component (5) mainly comprises a recoil pipe (12) and a lightning receptor (13); a flasher (13) is fixedly arranged at one end of the recoil pipe (12) with an opening and the other end, so that the recoil arc-extinguishing component (5) becomes a semi-closed pipe fitting with a hollow interior, an opening at one end and a closed end at the other end; the lightning receptor (13) is electrically connected with the arc striking electrode (14).

3. The air gap-free semi-closed double-recoil arc extinguishing lightning protection device according to claim 2, characterized in that: an opening of the recoil pipe (12) is provided with an arc guide ring (11).

4. The air gap-free semi-closed double-recoil arc extinguishing lightning protection device according to claim 1, characterized in that: the outer surface of the arc extinguishing body (4) is provided with a skirt edge (10).

5. The air gap-free semi-closed double-recoil arc extinguishing lightning protection device according to claim 1, characterized in that: the wall electrode (7) adopts an arc guide electrode plate or a compression arc extinguishing tube or a recoil tube.

6. The air gap-free semi-closed double-recoil arc extinguishing lightning protection device according to claim 1, characterized in that: and the opening of the recoil nozzle extending to the side surface of the arc extinguishing body inclines downwards.

7. The semi-enclosed double-recoil arc-extinguishing lightning protection device without an air gap according to any one of claims 1 to 6, wherein: the arc extinguishing and lightning protection device is applied to an electric transmission line, a transformer substation, a circuit breaker, a transformer or a series compensation device.

8. Use of the semi-enclosed double recoil arc extinguishing lightning protection device without air gap according to any of claims 1 to 6, characterized in that: the semi-closed double-recoil arc-extinguishing lightning protection device without the air gap is installed in parallel with the insulator string (1), namely two ends of the semi-closed double-recoil arc-extinguishing lightning protection device without the air gap are respectively installed on a low-voltage end (2) and a high-voltage end (3) of the insulator string through fixing hardware fittings.

Technical Field

The invention belongs to a lightning protection device for a power transmission and distribution overhead line, and relates to a semi-closed double-recoil arc-extinguishing lightning protection device without an air gap and application thereof.

Background

At present, lightning stroke accidents are frequent in areas such as overhead power transmission and distribution lines, transformer substations, power plants and the like, the accidents caused by lightning strokes bring great challenges to safe, stable and reliable operation of a power system, and great influences are brought to national economic development and the living standard of people. How to effectively extinguish arc and prevent lightning and improve the safety, stability and reliability of a power system is always the key research content of a power department, and the existing arc extinguishing and preventing lightning means mainly protects the power system by additionally arranging an arc extinguishing and preventing lightning device in a circuit of the power system; but required from lightning protection device technology: the comprehensive consideration and analysis of the points of safety, effectiveness, durability, economy and maintainability show that the technical level of the existing lightning protection device is difficult to achieve in one step.

In this regard, the applicant and the related inventors have conducted a great deal of research on the technical requirements of the lightning protection device, and found that the following problems still exist in the existing lightning protection device: firstly, the arc extinguishing effect is not good, the condensation pole effect is generated when the electric arc passes through, the gas generating effect is not good due to the gas generating material baked by the low-temperature electric arc, and the arc extinguishing effect is not good due to the contradiction between the condensation pole effect and the arc extinguishing formed by the gas generating material baked at high temperature; secondly, the arc extinguishing sensitivity is not high, the arc extinguishing effect is not good when small electric arcs pass through the lower multi-cavity chamber, the large electric arcs can act correctly only when larger electric arcs pass through the lower multi-cavity chamber, relay protection action is caused when large electric arcs circulate, and tripping accidents exist, so that the multi-cavity arc extinguishing sensitivity is not good; durability is not high, gas-generating materials need to be baked at high temperature to generate gas, and the gas-generating materials in the arc-extinguishing device are consumed at high temperature, so that the durability is not good; fourthly, under the influence of the operation mode, an arc extinguishing blind area exists, so that the arc extinguishing and lightning protection effects are poor.

Disclosure of Invention

The invention aims to provide a semi-closed double-recoil arc extinguishing lightning protection device without an air gap aiming at the defects in the prior art. The device has good arc extinguishing lightning protection effectiveness and durability.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a semi-closed double-recoil arc extinguishing lightning protection device without air gaps comprises an arc extinguishing body and a recoil arc extinguishing assembly; the interior of the arc extinguishing body is of a hollow structure, a partition plate is longitudinally arranged at the middle position in the arc extinguishing body, the partition plate divides the interior space of the arc extinguishing body into two groups of backflushing perfusion arc extinguishing channels, and wall electrodes are arranged on the partition plate; a recoil arc extinguishing component is fixedly installed at the upper end of the recoil perfusion arc extinguishing channel on the left side, and a recoil nozzle extending towards the side surface of the arc extinguishing body is arranged at the lower end of the recoil perfusion arc extinguishing channel; the upper end of the back-flushing pouring arc extinguishing channel on the right side is provided with a back-flushing nozzle extending to the side surface of the arc extinguishing body, and the lower end of the back-flushing arc extinguishing channel is fixedly provided with a back-flushing arc extinguishing assembly; and the recoil arc extinguishing component is also provided with an arc striking electrode.

The invention further discloses that the recoil arc-extinguishing component mainly comprises a recoil pipe and a lightning arrester; the flashover receiver is fixedly installed at one end of the recoil pipe, and the recoil arc-extinguishing component is a semi-closed pipe fitting which is hollow inside and is open at one end and closed at the other end; the lightning receptor is electrically connected with the arc striking electrode.

The arc striking electrode and the lightning arrester are both made of metal or nonmetal with strong conductivity, and can guide electric arcs to enter a back-flushing perfusion arc extinguishing channel; the recoil pipe is made of a non-conductive metal material with high strength and strong pressure resistance.

The invention further discloses that an arc guide ring is arranged at the opening of the back flushing pipe. The arc guide ring is made of metal or nonmetal with strong conductivity, and is matched with the wall electrode to guide the arc to rotate to the backflushing pouring arc extinguishing channel on the other side.

The invention further discloses that the outer surface of the arc extinguishing body is provided with a skirt edge. The skirt edge is arranged to enhance creepage distance and avoid electric arc creeping discharge.

The invention further discloses that the wall electrode adopts an arc guide electrode plate or a compression arc extinguishing tube or a recoil tube. The wall electrode can effectively disperse the arc energy, so that the arc can be extinguished more easily.

The invention further discloses that the opening of the recoil nozzle extending to the side surface of the arc extinguishing body is inclined downwards.

The invention can be applied to arc extinction and lightning protection on a transmission line, a transformer substation, a breaker, a transformer or a series compensation device.

In the practical application process, the semi-closed double-recoil arc-extinguishing lightning protection device without the air gap is installed in parallel with the insulator string, namely, two ends of the semi-closed double-recoil arc-extinguishing lightning protection device without the air gap are respectively installed on the low-voltage end and the high-voltage end of the insulator string through fixing hardware fittings.

The working principle of the invention is as follows:

the arc-extinguishing lightning protection device is arranged beside the insulator string in parallel, and electric arcs generated when a tower or a lightning conductor is struck by lightning are introduced into the semi-closed double-recoil arc-extinguishing lightning protection device, so that the insulator string is protected; the electric arc can be drawn into the device through the arc striking electrode, and as the back-flushing perfusion arc extinguishing channel is very thin, the thick thunder electric arc can be deformed into a slender electric arc when entering the back-flushing perfusion arc extinguishing channel, so that the whole back-flushing perfusion arc extinguishing channel is filled, and the back-flushing perfusion arc extinguishing channel can generate acting force on the electric arc to finally form a pressure explosion effect, block the subsequent electric arc from passing through and cut off the electric arc; when the electric arc enters the recoil pipe from the arc guide ring, the density, the speed and the temperature are increased to increase the pressure in the pipe and finally generate a pressure explosion effect, the electric arc impacts the flasher at the bottom of the recoil pipe, the electric arc is subjected to reverse elasticity at the bottom of the blocked recoil pipe, and the advancing direction of most of the electric arc is changed by 180 degrees; the rebounded arc acts on the outer arc at the inlet due to the larger speed, density and pressure, and causes the arc at the back flushing pipe port to be cut off until the arc is extinguished. In addition, if the electric arc still remains after one-time back-flushing arc extinguishing, the remaining residual electric arc which is not extinguished can be drawn into a back-flushing arc extinguishing component in the semi-closed back-flushing pouring arc extinguishing channel on the other side under the combined action of the arc guide ring and the wall electrode, and the back-flushing arc extinguishing action is carried out again, so that the electric arc is completely extinguished.

Compared with multi-chamber series arc extinguishing products, the invention has the following advantages:

(1) and (5) the durability is compared. The commonly added gas production material of the multi-chamber series arc extinguishing product needs to be baked to produce gas under the high-temperature condition, so the gas production material in the multi-chamber arc extinguishing device is consumed under the high-temperature environment, and the durability is poor; the pouring material adopted by the invention has no consumption factor, does not need to extinguish arc through a gas generation mechanism, and has better durability.

(2) And (5) arc extinguishing effect comparison. Every two adjacent electrodes in the multi-cavity series arc-extinguishing product generate a condensation polar effect when an electric arc passes through, namely, the temperature of the electric arc under the adjacent electrodes is lower, gas-generating materials are baked by the low-temperature electric arc to cause the gas-generating effect to be poor, and the arc-extinguishing effect is poor due to the contradiction between the condensation polar effect and arc-extinguishing formed by high-temperature baking gas generation; the invention adopts a narrow tube pouring mechanism, the electric arc collision generates huge arc extinguishing energy, and the self energy of the electric arc and the collision arc extinguishing are utilized, so that the arc extinguishing effect is excellent.

(3) And (5) comparing arc extinguishing sensitivity. According to the durability and the arc extinguishing effect, as the durability of the multi-cavity series arc extinguishing products is influenced by high temperature, and the generated gas is influenced by electrode condensation pole effect, namely the baking capability of low-temperature electric arc is extremely low, the contradiction between the condensation pole effect and the high-temperature baked generated gas forming arc extinguishing is formed, the arc extinguishing effect is not good when small electric arc passes through, the multi-cavity series arc extinguishing products can correctly act only when larger electric arc passes through, and the relay protection action is caused by the circulation of large electric arc, namely trip accidents exist, so the multi-cavity arc extinguishing sensitivity is not good; in the invention, no matter large electric arcs or small electric arcs exist, the electric arcs are only required to enter the invention to generate a perfusion mechanism, and the sensitivity is higher.

(4) And comparing the operation modes. According to the sensitivity analysis, the action of the multi-chamber series arc-extinguishing products is influenced by external factors such as system operation modes, short-circuit current and the like, and arc-extinguishing blind areas exist, so that the multi-chamber series arc-extinguishing products are difficult to match in a lightning protection manner; the invention has no influence of external factors such as system operation mode, short-circuit current and the like.

The invention has the advantages and beneficial effects as follows:

1. the double-recoil arc-extinguishing lightning protection device can effectively extinguish electric arcs aiming at different electric arc directions; and high air pressure generated in the semi-closed recoil arc extinguishing assembly can accelerate the medium to recover the strength, so that the electric arc is extinguished more quickly.

2. The wall electrode arranged on the clapboard can effectively disperse the energy of the electric arc, so that the electric arc is easier to extinguish.

3. The invention has wide application range and is not influenced by the arrangement of the conducting wires, the tower type of the tower and the polar effect.

4. The invention can restrict and control the arc path, and eliminate the harm of arc drift; can let electric arc strike the arc-extinguishing section arc extinguishing and destroy the power frequency and establish the arc passageway to guarantee relay protection device not perceived.

5. The invention is installed once, has no aging influence of the composite insulator core rod, can be repeatedly used for a long time, only needs to replace the recoil device regularly, and has low operation cost; the insulator flashover problem can be effectively prevented, the lightning trip-out rate of the power equipment is reduced, the power facilities are protected, the reliability of a power grid is improved, and the safety production of the power is facilitated.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.

Fig. 2 is a schematic diagram of a recoil arc extinguishing assembly of the present invention.

Fig. 3 is a schematic view of an application installation position of the present invention.

Fig. 4 is a schematic overall structure diagram of another embodiment of the present invention.

Fig. 5 is a schematic overall structure diagram of yet another embodiment of the present invention.

Fig. 6 is a schematic overall structure diagram of another embodiment of the present invention.

Sequence numbers and corresponding names in the figures:

1-insulator string, 2-low voltage end, 3-high voltage end, 4-arc extinguishing body, 5-recoil arc extinguishing component, 6-recoil nozzle, 7-wall electrode, 8-clapboard, 9-recoil pouring arc extinguishing channel, 10-skirt edge, 11-arc guiding ring, 12-recoil tube, 13-lightning arrester, 14-arc striking electrode.

Detailed Description

The invention is described in further detail below with reference to the following figures and detailed description: