阅读说明：本技术 一种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 and application thereof ) 是由 王巨丰 王嬿蕾 杨倩颖 张清河 彭斐 于 2019-04-16 设计创作，主要内容包括：本发明公开了一种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,隔板把灭弧体的内部空间隔成两个反冲灌注灭弧通道；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,下端为垂直向下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；本发明使用范围广,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 and application thereof, mainly comprising an arc extinguishing body and a recoil arc extinguishing assembly; 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 arc extinguishing body and divides the inner space of the arc extinguishing body into two backflushing pouring arc extinguishing channels; a recoil arc extinguishing component is fixedly arranged at the upper end of the recoil perfusion arc extinguishing channel at the left side, and a recoil nozzle which vertically extends downwards is arranged at the lower end of the recoil arc extinguishing component; 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, and eliminate the harm of arc drift; the invention 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-enclosed double-recoil arc-extinguishing lightning protection device comprises an arc extinguishing body (4) and a recoil arc-extinguishing component (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 in the middle of the interior of the arc extinguishing body (4), the partition plate (8) partitions the interior of the arc extinguishing body (4) into two backflushing pouring arc extinguishing channels (9), and wall electrodes (7) are arranged on the partition plate (8); a recoil arc extinguishing component is fixedly arranged at the upper end of the recoil perfusion arc extinguishing channel at the left side, and a recoil nozzle which vertically extends downwards is arranged at the lower end of the recoil arc extinguishing component; 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; the recoil arc extinguishing components are provided with electrodes (14); the electrode (14) is divided into an upper electrode (141) arranged on a recoil arc extinguishing component of a recoil pouring arc extinguishing channel which is vertically opened downwards and a lower electrode (142) arranged on a recoil arc extinguishing component of a recoil pouring arc extinguishing channel which is opened towards the side surface of the arc extinguishing body.

2. The semi-enclosed double-recoil arc-extinguishing lightning protection device according to claim 1, wherein: 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 electrode (14).

3. The semi-enclosed double-recoil arc-extinguishing lightning protection device according to claim 2, wherein: an opening of the backflushing pipe (12) is provided with an arc guide ring (11).

4. The semi-enclosed double-recoil arc-extinguishing lightning protection device according to claim 1, wherein: the outer surface of the arc extinguishing body (4) is provided with a skirt edge (10).

5. The semi-enclosed double-recoil arc-extinguishing lightning protection device according to claim 1, wherein: the wall electrode (7) adopts a lower electrode plate or a compression arc extinguishing tube or a recoil tube.

6. The semi-enclosed double-recoil arc-extinguishing lightning protection device according to claim 1, wherein: 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 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 a semi-enclosed double recoil arc extinguishing lightning protection device according to any of claims 1 to 6, characterized in that: the semi-closed double-recoil arc-extinguishing lightning protection device is characterized in that a semi-closed double-recoil arc-extinguishing lightning protection device is respectively installed at two ends of an insulator string (1) of a power transmission line through fixing hardware fittings, and a lower electrode of the semi-closed double-recoil arc-extinguishing lightning protection device at a low-voltage end of the insulator string points to an upper electrode of the semi-closed double-recoil arc-extinguishing lightning protection device at a high-voltage end of the insulator string, namely an air gap exists between the two semi-closed double-recoil.

9. Use of a semi-enclosed double recoil arc extinguishing lightning protection device according to any of claims 1 to 6, characterized in that: a semi-closed double-recoil arc-extinguishing lightning protection device is arranged at the low-voltage end of an insulator string (1) of the power transmission line through a fixed fitting, and an upper electrode of the semi-closed double-recoil arc-extinguishing lightning protection device is directly and electrically connected with the fixed fitting; a high-voltage electrode is fixedly arranged on the high-voltage end of an insulator string (1) of the power transmission line; the lower electrode of the semi-closed type double-recoil arc-extinguishing lightning protection device points to the high-voltage electrode, namely an air gap exists between the semi-closed type double-recoil arc-extinguishing lightning protection device and the high-voltage electrode.

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 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

Aiming at the problems, the invention provides a semi-closed double-recoil arc-extinguishing lightning protection device and application thereof.

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

a semi-enclosed double-recoil arc-extinguishing lightning protection device 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 partitions the inner space of the arc extinguishing body into two backflushing perfusion arc extinguishing channels, and a wall electrode is arranged on the partition plate; a recoil arc extinguishing component is fixedly arranged at the upper end of the recoil perfusion arc extinguishing channel at the left side, and a recoil nozzle which vertically extends downwards is arranged at the lower end of the recoil arc extinguishing component; 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; the recoil arc extinguishing components are provided with electrodes; the electrodes are divided into an upper electrode arranged on a recoil arc extinguishing component of a recoil pouring arc extinguishing channel which is vertically opened downwards and a lower electrode arranged on a recoil arc extinguishing component of a recoil pouring arc extinguishing channel which is opened towards the side surface of an arc extinguishing body.

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 electrode.

The electrode and the lightning receptor are both made of metal or nonmetal with strong conductivity, and can guide electric arcs into 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 opening of the injection cylinder is provided with an arc guide ring. 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 a lower 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 downward opening can effectively prevent rainwater or dust from entering the interior of the air jet flow channel.

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 devices are respectively installed at two ends of an insulator string of a power transmission line through fixing hardware fittings, and the lower electrode of the semi-closed double-recoil arc-extinguishing lightning protection device at the low-voltage end of the insulator string points to the upper electrode of the semi-closed double-recoil arc-extinguishing lightning protection device at the high-voltage end of the insulator string, namely, an air gap exists between the two semi-closed double-recoil arc-extinguishing lightning protection devices. The semi-closed double-recoil arc-extinguishing lightning protection device is arranged at the low-voltage end of the insulator string, and an upper electrode of the semi-closed double-recoil arc-extinguishing lightning protection device is electrically connected with the low-voltage end of the insulator string; and the lower electrode of the semi-closed double-recoil arc-extinguishing lightning protection device is electrically connected with the high-voltage end of the insulator string.

Or a semi-closed double-recoil arc-extinguishing lightning protection device is arranged at the low-voltage end of the insulator string of the power transmission line through a fixed fitting, and an upper electrode of the semi-closed double-recoil arc-extinguishing lightning protection device is directly and electrically connected with the fixed fitting; a high-voltage electrode is fixedly arranged at the high-voltage end of an insulator string of the power transmission line; the lower electrode of the semi-closed type double-recoil arc-extinguishing lightning protection device points to the high-voltage electrode, namely an air gap exists between the semi-closed type double-recoil arc-extinguishing lightning protection device and the high-voltage electrode.

The air gap with weaker insulating property is arranged beside the insulator string, so that lightning overvoltage generated when a pole tower or a lightning conductor is struck by lightning can be ensured to puncture the air gap preferentially, an electric arc is introduced into the semi-closed type double-recoil arc-extinguishing lightning protection device, and the electric arc is prevented from being flashover on the surface of the insulator string directly, so that the insulator string is protected to the greatest extent.

The working principle of the invention is as follows:

the arc extinguishing lightning protection device is arranged on one side or two sides of the insulator string, so that a preferential flashover air gap is generated near the insulator string; through insulation matching, lightning overvoltage generated when a tower or a lightning conductor is struck by lightning preferentially punctures an air gap channel which is connected with an insulator string in parallel, so that the insulator string is protected, the formed electric arc enters a semi-closed double-recoil arc extinguishing lightning protection device, the electric arc can enter the arc extinguishing lightning protection device through traction of an upper electrode, and as the recoil perfusion arc extinguishing channel is very thin, a thick lightning electric arc can be deformed into a slender electric arc when entering the recoil perfusion arc extinguishing channel, the whole recoil perfusion arc extinguishing channel is filled with the slender electric arc, and the recoil perfusion arc extinguishing channel can generate acting force on the electric arc, finally can form a pressure explosion effect, block the passage of subsequent electric arcs and block 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 receptor, 14-electrode, 141-upper electrode and 142-lower electrode.

Detailed Description

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