CN210404376U - A lightning protection distribution cabinet - Google Patents

Abstract

The utility model discloses a lightning protection switch board, including the cabinet body and lightning protection device, be provided with insulating barrier on the outer wall of cabinet body top, be provided with rain-proof eaves on insulating barrier's the top outer wall, and rain-proof eaves pass through bolt fixed connection on the outer wall at cabinet body top, the four corners department of rain-proof eaves is provided with insulating support column, and insulating support column's top fixedly connected with top cap, the center department of top cap top outer wall passes through bolt fixedly connected with base, and the central point of base top outer wall puts the welding and has the lightning rod that discharges in advance, electric connection has the earth connection on the outer wall of top cap bottom, and the earth connection keeps away from the one end welding. The utility model discloses can prevent effectively that the thunder and lightning from directly hitting the switch board cabinet body, reduce the direct harm brought to the switch board of thunder and lightning greatly, when the thunder wave invaded, can lead to the earth rapidly with the lightning current, prevent that too high voltage from causing the damage to electrical element in the switch board.

Description

A lightning protection distribution cabinet

technical field

The utility model relates to the technical field of power distribution cabinets, in particular to a lightning protection power distribution cabinet.

Background technique

Power distribution cabinets are divided into power distribution cabinets, lighting distribution cabinets, and metering cabinets, which are the final equipment of the power distribution system. The power distribution cabinet is the general name of the motor control center; the power distribution cabinet is used in the situation where the load is relatively scattered and the circuit is less. The motor control center is used in the situation where the load is concentrated and the circuits are many. The electrical energy is distributed to the nearby loads, and this level of equipment should provide protection, monitoring and control of the loads.

However, the current power distribution cabinet does not have particularly effective lightning protection measures, or is only equipped with lightning protection modules, which is far from meeting the needs of preventing internal electrical components when a thunderstorm comes. In severe cases, it will cause personal safety accidents. Therefore, it is urgent to design a lightning protection power distribution cabinet to solve the above problems.

Utility model content

The purpose of the utility model is to propose a lightning protection power distribution cabinet in order to solve the shortcomings existing in the prior art.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

A lightning protection power distribution cabinet, comprising a cabinet body and a lightning protection device, an insulating clapboard is arranged on the outer wall of the top of the cabinet body, and a rain-proof eaves are arranged on the top outer wall of the insulating clapboard, and the rain-proof eaves pass through bolts It is fixedly connected to the outer wall of the top of the cabinet, the four corners of the rain-proof eaves are provided with insulating support columns, and the top of the insulating support columns is fixedly connected with a top cover, and the center of the top outer wall of the top cover is fixedly connected with a bolt. The base is welded with a pre-discharge lightning rod at the center of the outer wall at the top of the base. A grounding wire is electrically connected to the outer wall of the bottom of the top cover, and a grounding body is welded at the end of the grounding wire away from the top cover. The outer wall of the side is welded with lifting ears, one side of the outer wall of the front of the cabinet body is provided with heat dissipation grooves distributed at equal distances, the bottom of the cabinet body is welded with a base, and one side of the outer wall of the base is plugged with an inlet. Cabinet wiring, the inner wall of the back panel of the cabinet is equidistantly welded with installation frames, the outer wall of the back of the installation frame is provided with wire collecting grooves, and the outer wall of the front of the installation frame is equidistantly provided with installation grooves. A clamping device is arranged in the installation groove, and one end of the installation frame is clamped with a discharge tube and a varistor through the clamping device.

Further, the clamping device includes a fixed pin and a bayonet, the inner wall of the installation slot is provided with bayonet slots that are distributed at equal distances, and a spring is fixed inside the bayonet slot, and the bayonet is inserted into the bayonet. in the groove, and the bottom outer wall of the bayonet is welded with one end of the spring.

Further, the lightning protection device includes two end covers and a porcelain sleeve, one end of the inner cavity of the porcelain sleeve is inserted with valve plates distributed at equal distances, and the other end of the inner cavity of the porcelain sleeve is inserted with a pressure plate. Tight sleeve, the compression sleeve and the valve plate form an arc extinguishing gap, the end caps are respectively clamped on both ends of the porcelain sleeve, the inner wall of the end cap is welded with a compression spring, and the compression spring is One end is movably connected with the compression sleeve.

Further, the varistor is connected in parallel to the cabinet entry line, the discharge tube is connected in parallel to the ground wire, and the discharge tube and the varistor are connected in parallel.

Further, the pre-discharge lightning rod includes a central collecting rod, an exciter and needle tips that are equidistantly distributed, the top of the central collecting rod is welded with the exciter, and the top surface of the exciter is welded with the bottom surface of the needle tip.

Further, a louver is provided on the outer wall of one side of the cabinet body, and an exhaust fan is connected to the interior of the louver through bolts.

The beneficial effects of the present utility model are:

1. By setting the pre-discharge lightning rod, it can be discharged in advance before the surrounding lightning comes, and the lightning current can be transmitted to the ground through its own grounding conductor, which can effectively prevent lightning from directly hitting the power distribution cabinet and greatly reduce lightning. Direct harm to the power distribution cabinet.

2. Through the set lightning protection device, when the lightning wave invades, due to the high overvoltage, the arc extinguishing gap is broken down, and the resistance of the valve plate is very small, so that the lightning wave can be leaked to the ground through the ground wire, thereby Prevent the intrusion of lightning waves.

3. Through the set discharge tube and varistor, when the lightning wave exceeds the withstand voltage strength of the varistor, the discharge tube is broken down to produce a low arc voltage of only tens of volts, which can limit the lightning in a short time. The further rise of the wave voltage prevents excessive voltage from causing damage to the electrical components in the power distribution cabinet.

Description of drawings

Fig. 1 is the structural representation of a kind of lightning protection distribution cabinet proposed by the utility model;

2 is a cross-sectional view of the internal structure of a lightning protection power distribution cabinet proposed by the utility model;

3 is a schematic structural diagram of a mounting frame of a lightning protection power distribution cabinet proposed by the utility model;

4 is a schematic structural diagram of a clamping device for a lightning protection power distribution cabinet proposed by the utility model;

5 is a structural cross-sectional view of a lightning protection device of a lightning protection power distribution cabinet proposed by the utility model;

6 is a circuit diagram of a discharge tube and a varistor of a lightning protection power distribution cabinet proposed by the utility model.

In the picture: 1 cabinet, 2 rain-proof eaves, 3 insulating support columns, 4 top cover, 5 pre-discharge lightning rod, 6 base, 7 lifting lugs, 8 grounding wires, 9 grounding bodies, 10 bases, 11 cabinet entry wires, 12 lightning protection device, 13 cooling slot, 14 shutter, 15 exhaust fan, 16 discharge tube, 17 varistor, 18 mounting slot, 19 mounting bracket, 20 insulating partition, 21 wiring slot, 22 clamping device, 23 card slot , 24 fixed pins, 25 bayonet pins, 26 springs, 27 valve plates, 28 end caps, 29 porcelain sleeves, 30 arc extinguishing gaps, 31 compression springs, 32 compression sleeves, 33 central collection rods, 34 excitation bodies, 35 needle tips .

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a co-existence of an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

1-6, a lightning protection power distribution cabinet includes a cabinet 1 and a lightning protection device 12. An insulating partition 20 is provided on the outer wall of the top of the cabinet 1 to isolate the current that may be generated on the top cover 4. The insulating partition The top outer wall of 20 is provided with rain-proof eaves 2 to prevent rainwater from entering the cabinet body 1, and the rain-proof eaves 2 are fixedly connected to the outer wall of the top of the cabinet body 1 by bolts, and the four corners of the rain-proof eaves 2 are provided with insulating support columns 3 , used to support the top cover 4, and the top of the insulating support column 3 is fixedly connected with the top cover 4, the center of the top outer wall of the top cover 4 is fixedly connected with the base 6 by bolts, the pre-discharge lightning rod 5 is fixed, and the top of the base 6 The center of the outer wall is welded with a pre-discharge lightning rod 5, which can be discharged in advance before the surrounding lightning strikes, and transmit the lightning current to the ground through its own grounding conductor. The bottom outer wall of the top cover 4 is electrically connected with a grounding wire 8, and the grounding wire 8. A grounding body 9 is welded to the end away from the top cover 4 to guide the lightning wave to the ground. The outer walls on both sides of the bottom of the top cover 4 are welded with lifting ears 7 to facilitate the mobile installation of the cabinet body 1. There are cooling grooves 13 equidistantly distributed on the side to dissipate the internal heat. The bottom of the cabinet 1 is welded with a base 10, and an outer wall of one side of the base 10 is plugged with an incoming cable 11 to connect the external circuit to the cabinet. Body 1, the inner wall of the back panel of the cabinet body 1 is equidistantly welded with mounting brackets 19, the outer wall of the back of the installation bracket 19 is provided with a wire collecting slot 21, and the outer wall of the front of the installation bracket 19 is equidistantly opened with installation slots 18. A clamping device 22 is provided in the installation groove 18 to facilitate the installation and disassembly of electrical components. One end of the mounting frame 19 is clamped with the discharge tube 16 and the varistor 17 through the clamping device 22.

Further, the clamping device 22 includes a fixing pin 24 and a clamping pin 25, the inner wall of the installation slot 18 is provided with clamping slots 23 distributed at equal distances, and the interior of the clamping slot 23 is fixedly provided with a spring 26, and the clamping pin 25 is inserted. In the card slot 23, and the bottom outer wall of the card pin 25 is welded with one end of the spring 26, the electrical components inside can be clamped.

Further, the lightning protection device 12 includes two end covers 28 and a porcelain sleeve 29. One end of the inner cavity of the porcelain sleeve 29 is inserted with valve plates 27 distributed at equal distances, and the other end of the inner cavity of the porcelain sleeve 29 is inserted into the cavity. There is a compression sleeve 32, the compression sleeve 32 and the valve plate 27 are surrounded by an arc extinguishing gap 30, the end caps 28 are respectively clamped at both ends of the porcelain sleeve 29, and the inner wall of the end cap 28 is welded with a compression spring 31, and One end of the compression spring 31 is movably connected with the compression sleeve 32. When the lightning wave invades, the arc extinguishing gap is broken down, and the resistance of the valve plate is very small, so that the lightning wave does not pass through the main line.

Further, the varistor 17 is connected in parallel with the incoming line 11 , the discharge tube 16 is connected in parallel with the ground wire 8 , and the discharge tube 16 is connected in parallel with the varistor 17 .

Further, the pre-discharge lightning rod 5 includes a central collecting rod 33, an exciter 34 and needle tips 35 that are equidistantly distributed. The top of the central collecting rod 33 is welded with the exciter 34, and the top surface of the exciter 34 and the bottom surface of the needle tip 35 are welded. When welding, the potential difference between the exciter 34 and the needle tip 35 is roughly equivalent to the potential between the thundercloud and the ground. When the lightning strikes, the air around the needle tip 35 will be ionized, forming a tip discharge phenomenon, and the discharge channel will rapidly discharge. Lightning intercepted and released to the ground.

Further, a louver 14 is provided on the outer wall of one side of the cabinet body 1 , and an exhaust fan 15 is connected to the interior of the louver 14 through bolts to discharge heat and dust in the cabinet.

Working principle: When in use, place the insulating partition 20 on the top of the cabinet 1, and then place the top cover 2 with the insulating support column 3 above the insulating partition 20, and then connect the top cover 2 to the cabinet by bolts. 1 Fix, fix the pre-discharge lightning rod 5 at the center of the top of the top cover 4 through the base 6 and bolts, then connect the grounding wire 8 to the top cover 4, and bury the grounding body 9 at the other end of the grounding wire 8 into the ground In the wet place, the discharge tube 16 and the varistor 17 are clamped on the mounting frame 19 through the fixing pin 24. During the clamping, the spring 26 pushes the bayonet 25 to move axially, and one end of the bayonet 25 is pressed against the surface of the fixing pin 24. , lock the bayonet 25 radially, and connect the varistor 17 in parallel to the cabinet line 11, the discharge tube 16 is connected in parallel to the ground wire 8, and the discharge tube 16 is connected in parallel with the varistor 17; The electric field strength of the excitation body 34 and the needle tip 35 of the lightning rod 5 will increase rapidly, and the potential difference between the excitation body 34 and the needle tip 35 is roughly equivalent to the potential between the thundercloud and the earth, and the rapid increase in the voltage drop between them will cause The tip ignites and ionizes the air around the needle tip 35 to form a tip discharge phenomenon. Due to the presence of a large number of ions, the natural electromagnetic field effect is reduced, and a discharge channel is generated to quickly intercept and discharge the lightning to the ground; when When the lightning wave enters from the cabinet entry line 11, the resistance value of the valve plate 27 will become lower, so that the inrush current is easy to pass, and then lead to the ground through the grounding wire 8 and the grounding body 9. When the lightning wave passes, the lower working voltage acts on the ground. On the valve plate 27, the valve plate 27 restores the high resistance state, limits the power frequency freewheeling, and cooperates with the arc extinguishing gap to extinguish the spark arc; the discharge tube 16 and the varistor 17 are the third layer of protection. When there is a lightning residual wave, the pressure sensitive The resistance value of the resistor 17 will become extremely small, and the lightning residual wave will flow into the discharge tube 16 through the varistor 17 with the extremely small resistance, so as to protect the normal circuit from being invaded, and the lightning residual wave flowing into the discharge tube 16 will be connected to the discharge tube 16. The ground wire 8 on the discharge tube 16 flows into the wiring body 9 and leads to the ground.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. A lightning protection power distribution cabinet comprises a cabinet body (1) and a lightning protection device (12), and is characterized in that an insulating partition plate (20) is arranged on the outer wall of the top of the cabinet body (1), a rain-proof eaves (2) is arranged on the outer wall of the top of the insulating partition plate (20), the rain-proof eaves (2) are fixedly connected to the outer wall of the top of the cabinet body (1) through bolts, insulating support columns (3) are arranged at four corners of the rain-proof eaves (2), a top cover (4) is fixedly connected to the top ends of the insulating support columns (3), a base (6) is fixedly connected to the center of the outer wall of the top cover (4) through bolts, a pre-discharge lightning rod (5) is welded to the center of the outer wall of the top of the base (6), a grounding wire (8) is electrically connected to the outer wall of the bottom of the, lifting lugs (7) are welded on the outer walls of two sides of the bottom of the top cover (4), radiating grooves (13) distributed equidistantly are formed in one side of the front outer wall of the cabinet body (1), a base (10) is welded at the bottom of the cabinet body (1), cabinet inlet lines (11) are inserted into the outer wall of one side of the base (10), mounting frames (19) are welded equidistantly on the inner wall of the back plate of the cabinet body (1), wire collecting grooves (21) are formed in the outer wall of the back face of the mounting frames (19), mounting grooves (18) are formed in the front outer wall of the mounting frames (19) equidistantly, clamping devices (22) are arranged in the mounting grooves (18), and discharge tubes (16) and piezoresistors (17) are clamped into one end of the mounting frames (19) through the clamping devices (22).

2. The lightning protection power distribution cabinet according to claim 1, wherein the clamping device (22) comprises a fixed pin (24) and a clamping pin (25), clamping grooves (23) are formed in the inner wall of the mounting groove (18) and are distributed equidistantly, a spring (26) is fixedly arranged inside the clamping grooves (23), the clamping pin (25) is inserted into the clamping grooves (23), and the outer wall of the bottom of the clamping pin (25) is welded to one end of the spring (26).

3. The lightning protection power distribution cabinet according to claim 1, wherein the lightning protection device (12) comprises two end covers (28) and porcelain sleeves (29), valve plates (27) are inserted into one end of a cavity inside the porcelain sleeve (29) and are distributed equidistantly, a pressing sleeve (32) is inserted into the other end of the cavity inside the porcelain sleeve (29), an arc extinguishing gap (30) is defined by the pressing sleeve (32) and the valve plates (27), the end covers (28) are respectively clamped at two ends of the porcelain sleeve (29), a pressing spring (31) is welded on the inner wall of each end cover (28), and one end of each pressing spring (31) is movably connected with the corresponding pressing sleeve (32).

4. The lightning protection distribution cabinet according to claim 1, wherein the piezoresistor (17) is connected in parallel to the cabinet-entering line (11), the discharge tube (16) is connected in parallel to the grounding line (8), and the discharge tube (16) is connected in parallel to the piezoresistor (17).

5. The lightning protection distribution cabinet according to claim 1, wherein the pre-discharge lightning rod (5) comprises a central collection rod (33), an exciter (34) and needle points (35) distributed at equal intervals, the top end of the central collection rod (33) is welded with the exciter (34), and the top surface of the exciter (34) is welded with the bottom surface of the needle points (35).

6. The lightning protection power distribution cabinet according to claim 1, wherein a louver (14) is arranged on the outer wall of one side of the cabinet body (1), and an exhaust fan (15) is connected to the inside of the louver (14) through a bolt.

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