Multi-level integrated lightning protection box

Abstract

The present invention relates to a lightning protection device; specifically, to a multi-stage integrated lightning protection box, including a box, the grounding wire of each module in the box is connected to a conductive mounting plate, the conductive mounting plate is fixed on the bottom plate of the lightning protection box by an insulating connection method, the conductive mounting plate is connected to the grounding column of the lightning protection box, the grounding column is connected to the external grounding wire through an insulating kit, and the box integrates a multi-stage lightning protection module, the multi-stage lightning protection module includes: a phase line and a neutral line; a primary lightning arrester, arranged between the phase line and the phase line or between the phase line and the neutral line; at least two-stage discharge circuits connected in parallel with the primary lightning arrester, the discharge circuit includes a first decoupler, a first lightning arrester and a second decoupler connected in series in sequence; a discharge channel is provided with a second lightning arrester between the tail end of the first decoupler and the tail end of the primary lightning arrester. The present invention adds a discharge channel without increasing the number of discharge stages, and increases the discharge speed while reducing the risk of electric shock.

Description

Technical Field

[0001] The invention relates to a lightning protection device, and in particular to a multi-level integrated lightning protection box. Background Art

[0002] The lightning protection box module is composed of a voltage switch module and a voltage limiting module (or integrated MOV). It is mainly installed in power distribution rooms, distribution cabinets, AC distribution panels, switch boxes and other important equipment, and the power supply lines of equipment that is easily struck by lightning to protect the equipment from damage caused by lightning overvoltage invading along the power line; it can be widely used in the main power protection of communication, power, transportation, finance, railways, civil aviation and other systems.

[0003] At present, the grounding setting of the lightning protection box generally adopts a bus bar. The modules in the box are fixed by a mounting plate. The mounting plate is connected to the outer shell of the box. A bus bar is set on the mounting plate. The ground wire of each module is first connected to the bus bar, and then connected to the ground wire outside the box through the bus bar. This grounding method has a long discharge path, resulting in high residual pressure and poor grounding protection effect. The long discharge path also leads to a long discharge time. In addition, the mounting plate is connected to the outer shell of the box, which poses a risk of electric shock. In addition, one end of the existing grounding wire is welded to the grounding electrode, and the other end is led out through the wire hole and connected to the grounding wire of the ground grid. It is inconvenient to install and easy to loosen. For multi-level lightning protection, due to the limitation of equipment size, most of them only set up a three-level discharge circuit, but the discharge effect is not ideal. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-stage integrated lightning protection box, which adds a discharge channel without increasing the number of discharge stages, thereby reducing the risk of electric shock and increasing the discharge speed, thereby improving the lightning protection effect.

[0005] The multi-stage integrated lightning protection box of the present invention comprises a box body, the grounding wires of each module in the box body are connected to a conductive mounting plate, the conductive mounting plate is fixed to the bottom plate of the lightning protection box by an insulating connection method, the conductive mounting plate is connected to a grounding column of the lightning protection box, the grounding column is connected to an external grounding wire through an insulating kit, and a multi-stage lightning protection module is integrated in the box body, and the multi-stage lightning protection module comprises:

[0006] Phase and neutral conductors;

[0007] Primary lightning arrester, installed between phase lines or between phase line and neutral line;

[0008] At least two stages of discharge circuits connected in parallel with the primary lightning arrester, the discharge circuits comprising a first decoupler, a first lightning arrester, and a second decoupler connected in series in sequence;

[0009] The discharge channel is provided with a second lightning arrester between the tail end of the first decoupler and the tail end of the primary lightning arrester.

[0010] The present invention sets the bottom plate of the lightning protection box and the conductive mounting plate to be insulated from each other, so that the grounding current of each module in the box is no longer discharged through the lightning protection box shell, thereby preventing the lightning protection box shell from discharging and reducing the risk of electric shock. Each module in the box is uniformly connected to the grounding column of the lightning protection box through the conductive mounting plate to discharge the grounding current. The conductive mounting plate has a large discharge area, good equipotential consistency, small resistance, short discharge path, and fast discharge speed. The grounding column can be quickly connected to the external grounding wire through an insulating kit.

[0011] The lightning signal is discharged step by step through the discharge circuits set up before and after. While discharging step by step, the discharge channel added to each discharge circuit provides an additional discharge path for the lightning signal, which can provide better protection for the equipment without increasing the number of discharge levels and the size of the equipment. The addition of discharge channels is suitable for discharge between phase lines, between phase lines and neutral lines, between phase lines and ground lines, and between neutral lines and ground lines. It can be flexibly set according to actual use needs. Generally, 3 levels of discharge circuits are sufficient.

[0012] Preferably, the grounding wires of the modules in the lightning protection box are connected in parallel through a busbar and then connected to the grounding column of the lightning protection box. Multiple discharge paths are connected in parallel, and the path resistance is further reduced, and the discharge speed is fast.

[0013] Preferably, the conductive mounting plate is connected to one end of the insulating sleeve through a support rod, and the bottom plate of the lightning protection box is connected to the other end of the insulating sleeve through a support rod. The support rod is generally made of high-strength metal or plastic, and the insulating sleeve is made of insulating materials such as ceramics and engineering plastics, and has a long service life.

[0014] Preferably, the second lightning arrester is a varistor, a discharge tube or a transient diode.

[0015] Preferably, the first lightning arrester of the last-stage discharge circuit is connected in parallel with a filter to improve the protection effect. The primary lightning arrester includes a discharge tube and a varistor connected in series. The first decoupler and the second decoupler both use decoupling inductors. The first lightning arrester includes a discharge tube and a varistor connected in series.

[0016] Preferably, the insulating kit includes an insulating connection card and a grounding body, the two ends of the insulating connection card are fixedly connected to the inner wall of the lightning protection box, the middle part of the insulating connection card fixes the grounding body, a conductive stud is arranged at one end of the grounding body, the conductive stud is connected to the grounding column of the lightning protection box through a wiring sleeve, an external stud is arranged at the other end of the grounding body, the external stud passes through the wire hole of the lightning protection box, an insulating connector is arranged between the external stud and the wire hole of the lightning protection box, and a wire nut is arranged on the part of the external stud extending outside the lightning protection box. When in use, the relative position of the grounding body and the lightning protection box is fixed by the insulating connection card to prevent the grounding body from shifting during the process of tightening the wire nut. The grounding column of the lightning protection box is quickly connected to the conductive stud through the wiring sleeve, and the external stud is insulated and fixed to the lightning protection box through the insulating connection. When the grounding wire is needed, it is pressed between the insulating connector and the wire nut through the wire nut, without welding, and the operation is simple and fast, and it is not easy to loosen.

[0017] Preferably, the wiring sleeve includes a wiring nut and a wiring socket arranged inside the insulating shell, the wiring nut matches the conductive stud, and the wiring socket matches the grounding column of the lightning protection box. During assembly, the grounding column of the lightning protection box can be directly plugged into the wiring socket.

[0018] Preferably, the insulating connector includes a first insulating collar and a second insulating collar, the inner diameter of the first insulating collar is adapted to the external stud, the outer wall of the first insulating collar is set to a stepped shape, a section with a smaller outer diameter of the first insulating collar matches the aperture of the wire hole of the lightning protection box, the inner diameter of the second insulating collar matches the end with a smaller outer diameter of the first insulating collar, the first insulating collar and the second insulating collar are fixed by a fixing nut, and when installed, the first insulating collar is sleeved on the outside of the external stud, and the end with a larger diameter is installed inside the lightning protection box, and the diameter The smaller end passes through the wire hole of the lightning protection box to achieve insulation between the external stud and the lightning protection box shell. The first insulating ring extends out of one end of the lightning protection box and is sleeved with a second insulating ring. After being fastened with a fixing nut, the outer wall of the outer lightning protection box is clamped by the first and second insulating rings. When a grounding wire is needed, the grounding wire is pressed between the fixing nut and the wire pressing nut by a wire pressing nut. If necessary, a gasket is arranged between the wire pressing nut and the fixing nut. The part of the first insulating ring arranged inside the lightning protection box is stuck between the insulating connection card and the shell of the lightning protection box.

[0019] Preferably, the insulating connection card fixes the grounding body through a hole, and the shape of the outer wall of the part where the grounding body is connected to the insulating connection card matches the contour of the hole. When the wire nut is rotated to tighten the ground wire, the hole can prevent the grounding body from rotating relative to the insulating connection card, thereby facilitating operation. The hole should avoid a relatively smooth shape as much as possible, and preferably has a shape with a larger contour undulation, such as a five-pointed star, gear shape, rectangle and other polygons.

[0020] Preferably, mounting holes are provided at both ends of the insulating connection card, and mounting studs are provided on the inner wall of the lightning protection box corresponding to the mounting holes. The insulating connection card is sleeved on the mounting studs through the two mounting holes and then tightened by nuts, so that the fixation is simple and stable.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention adds a discharge channel without increasing the number of discharge levels, thereby increasing the discharge speed while reducing the risk of electric shock. The bottom plate of the lightning protection box and the conductive mounting plate are insulated from each other, and the grounding current of each module in the box is no longer discharged through the lightning protection box shell, thereby preventing the lightning protection box shell from discharging and reducing the risk of electric shock. Each module in the box is uniformly connected to the grounding column of the lightning protection box through the conductive mounting plate to discharge the grounding current. The conductive mounting plate has a large discharge area, good equipotential consistency, low resistance, short discharge path, and fast discharge speed, thereby improving the lightning protection effect. The grounding column can be quickly connected to the external grounding wire through an insulating kit. The lightning signal is discharged step by step through the discharge circuits set before and after. While discharging step by step, the discharge channel added to each discharge circuit provides an additional discharge path for the lightning signal, which can provide better protection for the equipment without increasing the number of discharge levels and the volume of the equipment. The addition of discharge channels is applicable to the discharge between phase lines, the discharge between phase lines and neutral lines, the discharge between phase lines and ground lines, and the discharge between neutral lines and ground lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the installation of the conductive mounting plate and the bottom plate of the lightning protection box.

[0024] Figure 2 Schematic diagram of grounding of each module in the lightning protection box.

[0025] Figure 3 Block diagram of multi-level lightning protection module.

[0026] Figure 4 Circuit diagram of multi-level lightning protection module.

[0027] Figure 5 Insulation kit construction diagram.

[0028] Figure 6 Insulation connection card structure diagram.

[0029] In the figure: 1. Conductive mounting plate; 2. Lightning protection box bottom plate; 3. Busbar; 4. Conductive braid; 5. Insulating sleeve; 6. Support rod; 7. Insulating connection card; 8. Conductive stud; 9. Wiring sleeve; 10. External stud; 11. Wire nut; 12. Mounting hole; 13. First insulating collar; 14. Second insulating collar; 15. Fixing nut; 16. Hole. DETAILED DESCRIPTION

[0030] Embodiment 1:

[0031] like Figure 1-3 As shown, the multi-stage integrated lightning protection box of the present invention includes a box body, the grounding wires of each module in the box body are connected to a conductive mounting plate 1, the conductive mounting plate 1 is fixed on the bottom plate 2 of the lightning protection box by an insulating connection method, the conductive mounting plate 1 is connected to the grounding column of the lightning protection box, and the grounding column is connected to the external grounding wire through an insulating kit, and a multi-stage lightning protection module is integrated in the box body, and the multi-stage lightning protection module includes:

[0032] Phase and neutral conductors;

[0033] Primary lightning arrester, installed between phase lines or between phase line and neutral line;

[0034] A two-stage discharge circuit connected in parallel with the primary lightning arrester, the discharge circuit comprising a first decoupler, a first lightning arrester and a second decoupler connected in series in sequence;

[0035] The discharge channel is provided with a second lightning arrester between the tail end of the first decoupler and the tail end of the primary lightning arrester.

[0036] Among them, the grounding wires of each module in the lightning protection box are connected in parallel through the busbar 3 and then connected to the grounding column of the lightning protection box. The busbar 3 is connected to the grounding column of the lightning protection box through the conductive tape 4. The multi-path discharge is connected in parallel, the path resistance is further reduced, and the discharge speed is fast; the conductive mounting plate 1 is connected to one end of the insulating sleeve 5 through the support rod 6, and the bottom plate 2 of the lightning protection box is connected to the other end of the insulating sleeve 5 through the support rod 6. The support rod 6 is generally made of high-strength metal or plastic, and the insulating sleeve 5 is made of insulating materials such as ceramics and engineering plastics, and has a long service life. The conductive mounting plate 1, the conductive tape 4, and the busbar 3 are all made of good conductors, preferably metal copper.

[0037] The first lightning arrester of the secondary discharge circuit is connected in parallel with a filter to improve the protection effect. The primary lightning arrester includes a discharge tube and a varistor connected in series. The first decoupler and the second decoupler both use decoupling inductors. The first lightning arrester includes a discharge tube and a varistor connected in series. The second lightning arrester uses a varistor, a discharge tube or a transient diode.

[0038] The present invention adds a discharge channel without increasing the number of discharge levels, thereby reducing the risk of electric shock and increasing the discharge speed. The lightning protection box bottom plate 2 and the conductive mounting plate 1 are insulated from each other, and the grounding current of each module in the box is no longer discharged through the lightning protection box shell, which prevents the lightning protection box shell from discharging and reduces the risk of electric shock. Each module in the box is uniformly connected to the lightning protection box grounding column through the conductive mounting plate 1 to discharge the grounding current. The conductive mounting plate 1 has a large discharge area, good equipotential consistency, low resistance, short discharge path, and fast discharge speed. The grounding column can be quickly connected to the external grounding wire through an insulating kit.

[0039] The additional discharge channel is applicable to the discharge between phase lines, the discharge between phase lines and neutral lines, the discharge between phase lines and ground lines, and the discharge between neutral lines and ground lines. It can be flexibly set according to actual use requirements. Figure 4 The circuit diagram of adding discharge channels between phase lines is given. Lightning signals are discharged step by step through the discharge circuits set up before and after. While discharging step by step, the discharge channels added to each discharge circuit provide additional discharge paths for lightning signals, which can provide better protection for equipment without increasing the number of discharge levels and equipment volume.

[0040] Embodiment 2:

[0041] This embodiment, based on the embodiment 1, details the structure of the insulation kit. Figure 5-6 As shown, the insulating kit includes an insulating connection card 7 and a grounding body, both ends of the insulating connection card 7 are fixedly connected to the inner wall of the lightning protection box, the middle part of the insulating connection card 7 is fixed to the grounding body, a conductive stud 8 is arranged at one end of the grounding body, the conductive stud 8 is connected to the grounding column of the lightning protection box through a wiring sleeve 9, an external stud 10 is arranged at the other end of the grounding body, the external stud 10 passes through the wire hole of the lightning protection box, an insulating connector is arranged between the external stud 10 and the wire hole of the lightning protection box, and a wire nut 11 is arranged on the part of the external stud 10 extending outside the lightning protection box.

[0042] When in use, the relative position of the grounding body and the lightning protection box is fixed by the insulating connection card 7 to prevent the grounding body from shifting during the tightening of the wire nut 11. The grounding column of the lightning protection box is quickly connected to the conductive stud 8 through the wiring sleeve 9, and the external stud 10 is insulated and fixed to the lightning protection box through the insulating connector. When the grounding wire is needed, it is compressed between the insulating connector and the wire nut 11 through the wire nut 11. No welding is required, and the operation is simple and quick, and it is not easy to loosen.

[0043] Among them, the wiring sleeve 9 includes a wiring nut and a wiring jack arranged inside the insulating shell, the wiring nut matches the conductive stud 8, and the wiring jack matches the grounding column of the lightning protection box. During assembly, the grounding column of the lightning protection box can be directly plugged into the wiring jack; the insulating connection card 7 fixes the grounding body through the hole 16, and the shape of the outer wall of the part where the grounding body is connected to the insulating connection card 7 matches the contour of the hole 16. When the wire pressing nut 11 is rotated to press the ground wire, the hole 16 can prevent the grounding body from rotating relative to the insulating connection card 7, which is convenient for operation. The hole 16 should try to avoid a relatively smooth shape, and a shape with a larger contour undulation is preferred, such as a five-pointed star, a gear shape, a rectangle and other polygons. In order to increase the fixing strength, the middle part of the insulating connection card 7 can be set thicker; mounting holes 12 are set at both ends of the insulating connection card 7, and mounting studs are set on the inner wall of the lightning protection box corresponding to the mounting holes. The insulating connection card 7 is sleeved on the mounting studs through two mounting holes 12, and then tightened by nuts, which is simple and stable to fix.

[0044] The insulating connector includes a first insulating collar 13 and a second insulating collar 14. The inner diameter of the first insulating collar 13 is adapted to the external stud 10. The outer wall of the first insulating collar 13 is set to a stepped shape. The first insulating collar 13 with a smaller outer diameter matches the aperture of the wire hole of the lightning protection box. The inner diameter of the second insulating collar 14 matches the end with a smaller outer diameter of the first insulating collar 13. The first insulating collar 13 and the second insulating collar 14 are fixed by a fixing nut 15. When installed, the first insulating collar 13 is sleeved on the outside of the external stud 10, and the end with a larger diameter is installed inside the lightning protection box. The small end passes through the wire hole of the lightning protection box to achieve insulation between the external stud 10 and the lightning protection box shell. The first insulating ring 13 extends out of one end of the lightning protection box and a second insulating ring 14 is sleeved on the outside. After being fastened by the fixing nut 15, the outer wall of the outer lightning protection box is clamped by the first and second insulating rings. When a grounding wire is needed, the grounding wire is pressed between the fixing nut 15 and the wire pressing nut 11 by the wire pressing nut 11. If necessary, a gasket is arranged between the wire pressing nut 11 and the fixing nut 15. The part of the first insulating ring 13 arranged inside the lightning protection box is stuck between the insulating connection card 7 and the shell of the lightning protection box.

Claims

1. A multi-level integrated lightning protection box, comprising a box body, characterized in that: The grounding wires of the modules in the box are connected to a conductive mounting plate (1), the conductive mounting plate (1) is fixed on the bottom plate (2) of the lightning protection box by an insulating connection method, the conductive mounting plate (1) is connected to the grounding column of the lightning protection box, the grounding column is connected to the external grounding wire through an insulating kit, and a multi-stage lightning protection module is integrated in the box, and the multi-stage lightning protection module includes: Phase and neutral conductors; Primary lightning arrester, installed between phase lines or between phase line and neutral line; At least two stages of discharge circuits connected in parallel with the primary lightning arrester, the discharge circuits comprising a first decoupler, a first lightning arrester, and a second decoupler connected in series in sequence; The discharge channel includes a second lightning arrester disposed between the tail end of the first decoupler and the tail end of the primary lightning arrester; The insulating kit comprises an insulating connection card (7) and a grounding body, wherein both ends of the insulating connection card (7) are fixedly connected to the inner wall of the lightning protection box, the middle part of the insulating connection card (7) is fixed to the grounding body, a conductive stud (8) is arranged at one end of the grounding body, the conductive stud (8) is connected to the grounding column of the lightning protection box through a wiring sleeve (9), an external stud (10) is arranged at the other end of the grounding body, the external stud (10) passes through the wire hole of the lightning protection box, an insulating connector is arranged between the external stud (10) and the wire hole of the lightning protection box, and a wire pressing nut (11) is arranged on the part of the external stud (10) extending outside the lightning protection box; The wiring sleeve (9) comprises a wiring nut and a wiring jack arranged inside the insulating shell, the wiring nut matches the conductive stud (8), and the wiring jack matches the grounding column of the lightning protection box; The insulating connector comprises a first insulating ring (13) and a second insulating ring (14); the inner diameter of the first insulating ring (13) is adapted to the external stud; the outer wall of the first insulating ring (13) is arranged in a stepped shape; a section of the first insulating ring (13) with a smaller outer diameter matches the aperture of the wire hole of the lightning protection box; the inner diameter of the second insulating ring (14) matches the end of the first insulating ring (13) with a smaller outer diameter; the first insulating ring (13) and the second insulating ring (14) are fixed by a fixing nut (15).

2. The multi-level integrated lightning protection box according to claim 1, characterized in that: The grounding wires of the modules of the box are connected in parallel through a busbar (3) and then connected to the grounding column of the lightning protection box.

3. The multi-level integrated lightning protection box according to claim 1, characterized in that: The conductive mounting plate (1) is connected to one end of the insulating sleeve (5) via a support rod (6), and the lightning protection box bottom plate (2) is connected to the other end of the insulating sleeve (5) via the support rod (6).

4. The multi-level integrated lightning protection box according to claim 1, characterized in that: The second lightning arrester adopts a varistor, a discharge tube or a transient diode.

5. The multi-level integrated lightning protection box according to claim 1, characterized in that: The insulating connection card (7) fixes the grounding body through the hole (16), and the shape of the outer wall portion of the grounding body connected to the insulating connection card (7) matches the contour of the hole (16).

6. The multi-level integrated lightning protection box according to claim 1, characterized in that: Mounting holes (12) are arranged at both ends of the insulating connection card (7), and mounting studs are arranged on the inner wall of the lightning protection box corresponding to the mounting holes (12).

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