A single-column multi-parallel independent unit lightning arrester

Abstract

The present application relates to the field of lightning arresters, and specifically discloses a single-column multi-parallel independent unit lightning arrester, comprising a first unit and a second unit; the first unit comprises a first upper hardware, a first insulating jacket, and a first lower hardware connected in sequence, a first resistor, a first metal pad, and a first electrode are sequentially arranged inside the first insulating jacket along the direction from the first upper hardware to the first lower hardware, a wire is connected between the first upper hardware and the first lower hardware, the wire is passed between the first resistor, the first metal pad, and the first electrode, and a second insulating tube is arranged on the outside of the wire; the second unit comprises a second upper hardware, a second insulating jacket, and a second lower hardware connected in sequence, a second resistor, a second metal pad, and a second electrode are sequentially arranged inside the second insulating jacket along the direction from the second upper hardware to the second lower hardware. The present application sets up multiple parallel independent unit lightning arresters in one place, which is suitable for places with high protection performance requirements and difficult maintenance.

Description

Technical Field

[0001] The present application relates to the field of lightning arresters, and in particular to a single-column multi-parallel independent unit lightning arrester. Background Art

[0002] A lightning arrester, also known as an overvoltage protector, is an electrical device used to protect electrical equipment from high transient overvoltages. Typically connected in parallel with the equipment being protected, an arrester immediately activates when the overvoltage reaches the specified operating voltage, flowing a charge through it, limiting the overvoltage amplitude and protecting the equipment's insulation. Once the voltage returns to normal, the arrester quickly returns to its original state to ensure normal power supply. Arresters are widely used to protect transformers, transmission lines, distribution panels, switchgear, power meter boxes, vacuum switches, and other equipment from damage caused by lightning and operational overvoltages.

[0003] In related technologies, lightning arresters are equipped with a resistor with excellent nonlinear volt-ampere characteristics. When an overvoltage occurs in the system, the resistor exhibits low resistance, allowing large currents to flow, thereby protecting equipment from overvoltage damage. Under normal operating voltages of the power system, the resistor exhibits high resistance, allowing only microampere leakage current to flow through the arrester, effectively insulating it from the system.

[0004] Lightning arresters are connected in parallel to power lines, meaning multiple, individually installed arresters are installed at intervals along a single line. If an arrester is damaged by lightning, it must be promptly replaced to ensure stable system operation. However, in practice, if thunderstorms persist for multiple days or the site is located in a remote area, damaged arresters cannot be replaced promptly, potentially leading to serious electrical accidents. Summary of the Invention

[0005] The present application provides a single-column multi-parallel independent unit lightning arrester, which is suitable for places with high protection performance requirements and difficult routine maintenance, and does not need to be handled immediately when a fault occurs.

[0006] The present application provides a single-column multi-parallel independent unit lightning arrester adopts the following technical solution:

[0007] A single-column multi-parallel independent unit arrester comprises a first unit and a second unit;

[0008] The first unit includes a first upper hardware, a first insulating jacket, and a first lower hardware connected in sequence. A first resistor, a first metal pad, and a first electrode are sequentially arranged inside the first insulating jacket along the direction from the first upper hardware to the first lower hardware. A wire is connected between the first upper hardware and the first lower hardware. The wire is passed between the first resistor, the first metal pad, and the first electrode. A second insulating tube is arranged outside the wire.

[0009] The second unit includes a second upper hardware, a second insulating jacket and a second lower hardware connected in sequence, wherein a second resistor, a second metal pad and a second electrode are sequentially arranged inside the second insulating jacket along the direction from the second upper hardware to the second lower hardware;

[0010] Connectors are provided between the first resistor and the first upper hardware, and between the second resistor and the second upper hardware. The first metal pad and the second metal pad are both connected to a disconnector. Air gaps are provided between the first electrode and the first lower hardware, and between the second electrode and the second lower hardware. The second upper hardware is connected to the first lower hardware with fasteners.

[0011] By adopting the above technical solution, during the use of the lightning arrester, once the energy absorbed is too large (such as lightning strike, etc.), making the lightning arrester unable to withstand the energy, the lightning arrester will self-damage, the internal resistor will be broken down, and the short-circuit current will trigger the disconnector to operate and the internal circuit breaker to trip, thereby eliminating the short-circuit current.

[0012] The path through which high current can flow is the first upper fitting, the first resistor, the first metal spacer, and the disconnector on the first unit. Alternatively, it can be the first upper fitting, the wire, the first lower fitting, the second upper fitting, the second resistor, the second metal spacer, and the disconnector on the second unit. The first and second units are structurally connected in series but functionally connected in parallel.

[0013] Therefore, when the system is struck by lightning, degraded units will break down. This lightning current then flows through the grounding wire from the disconnector and into the earth. Subsequently, due to the power-frequency voltage on the line, a power-frequency continuous current forms at the faulty unit, flowing through the disconnector to the earth. This causes the system voltage to drop, and the short-circuit current triggers the disconnector to disconnect, eliminating the short-circuit fault and removing the faulty unit from system operation. During this period, intact units can continue to operate, providing overvoltage protection for the power system.

[0014] Optionally, one end of the wire facing the first upper hardware is fixedly connected to a fixing seat, and the fixing seat is connected to the first upper hardware by using threads.

[0015] By adopting the above technical solution, the wires are easy to assemble and firmly installed.

[0016] Optionally, the fixing seat includes a threaded sleeve and a limiting cover connected to the threaded sleeve, the end of the wire is crimped inside the threaded sleeve, the limiting cover is crimped to the outside of the end of the second insulating tube, and the first upper hardware is provided with a threaded hole for the threaded sleeve to be screwed in.

[0017] By adopting the above technical solution, the fixing seat limits the end of the second insulating tube together, thereby ensuring the electrical insulation effect.

[0018] Optionally, one end of the wire facing the first lower hardware is fixedly connected to a mounting seat, the first lower hardware is provided with a slot for inserting the mounting seat and the second insulating tube, and the first lower hardware is penetrated by a mounting screw threadedly connected to the mounting seat.

[0019] By adopting the above technical solution, the wires are easy to assemble and firmly installed.

[0020] Optionally, the first lower hardware is provided with a countersunk hole for the installation screw to pass through, the countersunk hole is communicated with the slotted hole, and the interior of the countersunk hole is filled with sealant.

[0021] Optionally, flanges are connected to the outer sides of the first lower hardware and the second upper hardware, and the flanges are connected by fasteners.

[0022] By adopting the above technical solution, it is convenient to disassemble and replace the faulty unit.

[0023] Optionally, the insulating jacket includes a silicone rubber jacket and a first insulating tube arranged inside the silicone rubber jacket. The first upper hardware, the first lower hardware, the second upper hardware and the second lower hardware are all provided with a sealing groove for inserting the silicone rubber jacket, and the sealing groove is provided with an inclined surface.

[0024] By adopting the above technical solution, the installation of the insulating jacket is stable, and the safety and sealing of the lightning arrester are improved.

[0025] Optionally, the first electrode is connected to a first limiting clamp, the second electrode is connected to a second limiting clamp, the first metal pad is connected to a first boss inserted into the first limiting clamp, and the second metal pad is connected to a second boss inserted into the second limiting clamp.

[0026] Optionally, the connecting member includes a compression spring and a support pad, one end of the compression spring presses against the first upper hardware or the second upper hardware, and the other end presses against the support pad, and the support pad is attached to the first resistor sheet or the second resistor sheet.

[0027] By adopting the above technical solution, the structural stability is improved.

[0028] Optionally, the disconnector is threadedly connected to the first metal block or the second metal block, and the first insulating jacket and the second insulating jacket are both provided with a grounding terminal for connection of the disconnector.

[0029] By adopting the above technical solution, the installation of the disconnector is facilitated.

[0030] In summary, this application has the following beneficial effects:

[0031] The present application sets up multiple independent units in parallel in one place, which is suitable for places with high protection performance requirements and difficult routine maintenance. Since each unit is relatively independent, even if a single unit is damaged, there are other units to continue protection. Therefore, there is no need to deal with the fault as soon as it occurs, and it can be dealt with according to the situation. During maintenance, only the damaged unit needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a single-column multi-parallel independent unit arrester according to an embodiment of the present application;

[0033] Figure 2 is a structural diagram of the first unit in an embodiment of the present application;

[0034] Figure 3 is a structural diagram of the second unit in an embodiment of the present application;

[0035] Figure 4 yes Figure 2 A magnified schematic diagram of area A in the middle;

[0036] Figure 5 yes Figure 2 A magnified schematic diagram of area B in the middle;

[0037] Figure 6 yes Figure 2 Enlarged schematic diagram of the middle C area;

[0038] Figure 7 yes Figure 2 Schematic enlargement of region D in the middle.

[0039] Explanation of reference numerals: 1. first unit; 11. first upper fitting; 111. threaded hole; 112. sealing groove; 1121. inclined surface; 12. first insulating jacket; 121. silicone rubber jacket; 122. first insulating tube; 13. first lower fitting; 131. slot; 132. countersunk hole; 133. sealant; 14. first resistor; 15. first metal pad; 151. first boss; 16. first electrode; 161. first limiting clamp; 17. wire; 18. second insulating tube ;19. Fixing seat;191. Threaded sleeve;192. Limiting cover;2. Second unit;21. Second upper fitting;22. Second insulating sleeve;23. Second lower fitting;24. Second resistor;25. Second metal pad;251. Second boss;26. Second electrode;261. Second limiting clamp;3. Connecting piece;31. Compression spring;32. Supporting element;4. Disconnector;5. Air gap;6. Mounting seat;7. Mounting screw;8. Flange;9. Fastener;10. Grounding terminal. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-7 This application is described in further detail.

[0041] The embodiment of the present application discloses a single-column multi-parallel independent unit lightning arrester.

[0042] Reference Figure 1 The single-pole, multi-parallel independent unit lightning arrester includes a first unit 1 and a second unit 2. The first unit 1 is used to connect to the power system, and the second unit 2 is connected to the first unit 1. The first unit 1 and the second unit 2 are both independent lightning arrester units, which are structurally connected in series and functionally connected in parallel. Therefore, if one unit fails, the other normal unit can continue to work. It is suitable for places with high protection performance requirements and difficult maintenance.

[0043] In the embodiment of the present application, the number of the first unit 1 is 1; in other embodiments, the number of the first units 1 can also be 2, 3 or more, and the multiple first units 1 are distributed along the axial direction, with the first unit 1 at the top connected to the power system and the first unit 1 at the bottom connected to the second unit 2. The more units are connected, the higher the safety performance, but the cost will increase accordingly.

[0044] Reference Figure 1 、 Figure 2 The first unit 1 includes a first upper fitting 11, a first insulating jacket 12, and a first lower fitting 13, which are connected in sequence. Inside the first insulating jacket 12, a connector 3, a first resistor 14, a first metal spacer 15, and a first electrode 16 are arranged in sequence along the direction from the first upper fitting 11 to the first lower fitting 13. The first resistor 14, the first metal spacer 15, and the first electrode 16 are all ring-shaped. A wire 17 is connected between the first upper fitting 11 and the first lower fitting 13. A second insulating tube 18 is sleeved on the outside of the wire 17. The wire 17 and the second insulating tube 18 pass through the connector 3, the first resistor 14, the first metal spacer 15, and the middle of the first electrode 16. The second insulating tube 18 limits the position of the first resistor 14 and the wire 17, allowing current to flow through them, thereby achieving functional parallel connection.

[0045] In the embodiment of the present application, the conductor 17 can be copper wire or cable. An air gap 5 is provided between the first electrode 16 and the first lower fitting 13. A disconnector 4 is connected to the side of the first metal spacer 15. During use, if the lightning arrester absorbs excessive energy (such as from a lightning strike), making it unable to withstand the energy, the arrester will self-destruct, the internal resistor will break down, and the short-circuit current will trigger the disconnector 4 to operate and trip the internal circuit breaker, thereby eliminating the short-circuit current.

[0046] Reference Figure 1 、 Figure 3The second unit 2 includes a second upper fitting 21, a second insulating jacket 22, and a second lower fitting 23, which are connected in sequence. Inside the second insulating jacket 22, a connector 3, a second resistor 24, a second metal block 25, and a second electrode 26 are arranged in sequence from the second upper fitting 21 to the second lower fitting 23. The second resistor 24, the second metal block 25, and the second electrode 26 are annular, or alternatively circular, in shape. A disconnector 4 is connected to the side of the second metal block 25. An air gap 5 is provided between the second electrode 26 and the second lower fitting 23.

[0047] Reference Figure 1 The first lower fitting 13, the second upper fitting 21, and the second lower fitting 23 are all fixedly connected to the outside of the flange 8. The flange 8 of the first lower fitting 13 and the flange 8 of the second upper fitting 21 are connected by fasteners 9, which are bolts and nuts. After removing the fasteners 9, the faulty unit can be removed and replaced, facilitating maintenance. The flange 8 is universal, allowing for easy assembly of units and a wide range of applications.

[0048] Reference Figure 2 、 Figure 4 The end of the wire 17 facing the first upper hardware 11 is fixedly connected to a fixing seat 19, and the fixing seat 19 includes a threaded sleeve 191 and a limiting cover 192 fixedly connected to the threaded sleeve 191. The end of the wire 17 is fixedly crimped inside the threaded sleeve 191, and the limiting cover 192 is crimped to the outside of the end of the second insulating tube 18. The first upper hardware 11 is provided with a threaded hole 111 for the threaded sleeve 191 to be screwed in.

[0049] Reference Figure 2 、 Figure 5 The end of the wire 17 facing the first lower fitting 13 is fixedly connected to the mounting base 6. The first lower fitting 13 is provided with a slot 131 for inserting the mounting base 6 and the second insulating tube 18. The side of the first lower fitting 13 facing away from the wire 17 is penetrated by a mounting screw 7. The first lower fitting 13 is provided with a countersunk hole 132 for the mounting screw 7 to pass through. The countersunk hole 132 is connected to the slot 131. The mounting screw 7 is threadedly connected to the mounting base 6. The interior of the countersunk hole 132 is filled with sealant 133, which covers the head of the mounting screw 7. The wire 17 is easy to assemble and has a stable installation.

[0050] Reference Figure 2 、 Figure 3 The disconnector 4 is threadedly connected to the first metal pad 15 or the second metal pad 25, and the first insulating jacket 12 and the second insulating jacket 22 are both provided with a grounding terminal 10 for threaded connection of the disconnector 4, which has a thread for connection of the disconnector 4.

[0051] Reference Figure 3 、 Figure 4The connecting member 3 includes a compression spring 31 and a support pad 32. One end of the compression spring 31 is pressed against the first upper hardware 11 or the second upper hardware 21, and the other end is pressed against the support pad 32. The support pad 32 is attached to the first resistor 14 or the second resistor 24.

[0052] Reference Figure 2 、 Figure 6 The insulating jacket includes a silicone rubber jacket 121 and a first insulating tube 122 arranged on the inner side of the silicone rubber jacket 121. The insulating jacket referred to here is the first insulating jacket 12 and the second insulating jacket 22. The two ends of the first insulating tube 122 are respectively threadedly connected to the upper hardware and the lower hardware. The upper hardware and the lower hardware are both provided with a sealing groove 112 for inserting the silicone rubber jacket 121. The cross-section of the sealing groove 112 is a right triangle and the outer side surface is an inclined surface 1121. The upper hardware referred to here is the first upper hardware 11 and the second upper hardware 21, and the lower hardware referred to here is the first lower hardware 13 and the second lower hardware 23.

[0053] Reference Figure 3 、 Figure 7 The first electrode 16 is fixedly connected to a first limiting snap ring 161, the second electrode 26 is fixedly connected to a second limiting snap ring 261, the first metal pad 15 is connected to a first boss 151 inserted into the first limiting snap ring 161, and the second metal pad 25 is connected to a second boss 251 inserted into the second limiting snap ring 261.

[0054] The implementation principle of the single-column multi-parallel independent unit arrester in the embodiment of the present application is:

[0055] The large current can pass through the path of the first upper hardware 11, the first resistor 14, the first metal pad 15, and the disconnector 4, or it can pass through the path of the first upper hardware 11, the wire 17, the first lower hardware 13, the second upper hardware 21, the second resistor 24, the second metal pad 25, and the disconnector 4.

[0056] When a lightning strike strikes the system, degraded units break down. This lightning current then flows through the grounding wire from disconnector 4 and into the earth. Subsequently, due to the power-frequency voltage on the line, a power-frequency freewheeling current forms in the faulty unit, flowing through disconnector 4 to the earth. This lowers the system voltage and triggers the short-circuit current to activate disconnector 4, eliminating the short-circuit fault and removing the faulty unit from system operation.

[0057] During this period, intact units can continue to work and provide overvoltage protection for the power system. There is no need to deal with the fault immediately after it occurs, and it can be handled according to the situation.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A single-column multi-parallel independent unit arrester, characterized by: comprising a first unit (1) and a second unit (2); The first unit (1) comprises a first upper fitting (11), a first insulating jacket (12) and a first lower fitting (13) connected in sequence, wherein a first resistor (14), a first metal pad (15) and a first electrode (16) are sequentially arranged inside the first insulating jacket (12) along a direction from the first upper fitting (11) to the first lower fitting (13), a wire (17) is connected between the first upper fitting (11) and the first lower fitting (13), the wire (17) is passed between the first resistor (14), the first metal pad (15) and the first electrode (16), and a second insulating tube (18) is arranged outside the wire (17); The second unit (2) comprises a second upper fitting (21), a second insulating jacket (22) and a second lower fitting (23) connected in sequence, wherein a second resistor (24), a second metal pad (25) and a second electrode (26) are sequentially arranged inside the second insulating jacket (22) along a direction from the second upper fitting (21) to the second lower fitting (23); Connectors (3) are provided between the first resistor (14) and the first upper hardware (11), and between the second resistor (24) and the second upper hardware (21); the first metal pad (15) and the second metal pad (25) are connected to a disconnector (4); air gaps (5) are provided between the first electrode (16) and the first lower hardware (13), and between the second electrode (26) and the second lower hardware (23); and the second upper hardware (21) and the first lower hardware (13) are connected by fasteners.

2. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: One end of the wire (17) facing the first upper hardware (11) is fixedly connected to a fixing seat (19), and the fixing seat (19) and the first upper hardware (11) are connected by threads.

3. The single-column multi-parallel independent unit arrester according to claim 2, characterized in that: The fixing seat (19) includes a threaded sleeve (191) and a limiting cover (192) connected to the threaded sleeve (191); the end of the wire (17) is crimped to the inside of the threaded sleeve (191); the limiting cover (192) is crimped to the outside of the end of the second insulating tube (18); and the first upper hardware (11) is provided with a threaded hole (111) for the threaded sleeve (191) to be screwed in.

4. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: One end of the wire (17) facing the first lower hardware (13) is fixedly connected to a mounting seat (6); the first lower hardware (13) is provided with a slot (131) for inserting the mounting seat (6) and the second insulating tube (18); the first lower hardware (13) is provided with a mounting screw (7) threadedly connected to the mounting seat (6).

5. The single-column multi-parallel independent unit arrester according to claim 4, characterized in that: The first lower hardware (13) is provided with a countersunk hole (132) for the installation screw (7) to pass through, the countersunk hole (132) is communicated with the slot hole (131), and the interior of the countersunk hole (132) is filled with sealant (133).

6. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: The outer sides of the first lower hardware (13) and the second upper hardware (21) are both connected with flanges (8), and the flanges (8) are connected via fasteners (9).

7. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: The insulating jacket (12, 22) comprises a silicone rubber jacket (121), a first insulating tube (122) arranged inside the silicone rubber jacket (121), the first upper hardware (11), the first lower hardware (13), the second upper hardware (21) and the second lower hardware (23) are all provided with a sealing groove (112) into which the silicone rubber jacket (121) is inserted, and the sealing groove (112) is provided with an inclined surface (1121).

8. The single-column multi-parallel independent unit arrester according to claim 7, characterized in that: The first electrode (16) is connected to a first limiting snap ring (161), the second electrode (26) is connected to a second limiting snap ring (261), the first metal pad (15) is connected to a first boss (151) inserted into the first limiting snap ring (161), and the second metal pad (25) is connected to a second boss (251) inserted into the second limiting snap ring (261).

9. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: The connecting member (3) comprises a compression spring (31) and a support pad (32); one end of the compression spring (31) is pressed against the first upper hardware (11) or the second upper hardware (21), and the other end is pressed against the support pad (32); the support pad (32) is attached to the first resistor (14) or the second resistor (24).

10. The single-column multi-parallel independent unit arrester according to claim 1, characterized in that: The disconnector (4) is threadedly connected to the first metal pad (15) or the second metal pad (25); the first insulating jacket (12) and the second insulating jacket (22) are both provided with a grounding terminal (10) for connecting the disconnector (4), and a thread for connecting the disconnector (4) is provided thereon.

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