A grounding protection device for smart grid

Abstract

The present invention relates to the technical field of grounding protection devices for power grids, and discloses a grounding protection device for smart grids, including a telescopic bracket, two limit assemblies and a conductive bar, wherein the telescopic bracket has two telescopic ends that can move closer to or farther from each other; two limit assemblies are respectively arranged at the two telescopic ends, and the limit assembly includes two limit brackets, which are respectively arranged on both sides of the telescopic bracket and can be rotatably connected to the telescopic bracket. When the limit bracket is rotated to be perpendicular to the telescopic bracket, a limit structure is formed between the limit bracket and the telescopic bracket; the conductive bar is detachably connected to the telescopic bracket; wherein the telescopic bracket, the limit bracket and the conductive bar are all conductive and electrically connected to each other. The telescopic bracket and the limit bracket can be unfolded and folded, and there is no need to fix each component by welding. The telescopic bracket and the limit bracket extending in different directions increase the length of the grounding, which can effectively reduce the grounding resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid grounding protection, and in particular to a grounding protection device for a smart grid. Background Art

[0002] The grounding protection device of the smart grid connects the metal shell or frame of the electrical equipment to the earth to prevent the live parts caused by insulation damage or other reasons from posing a threat to personal safety. According to the purpose of grounding, the grounding device can be divided into working grounding, protective grounding, protective grounding and lightning protection grounding. Among them, protective grounding is to prevent the metal shell of the electrical equipment, the frame of the distribution device and the line tower from being energized after the insulation is damaged, so as to avoid posing a threat to the safety of people and equipment. The basic principle of protective grounding is to limit the leakage current of the leakage equipment to the ground so that it does not exceed a certain safety range. Once it exceeds a certain set value, the protector can automatically cut off the power supply. The core of the smart grounding distribution system is to configure the smart grounding device and connect it to the substation through a circuit breaker. When a single-phase grounding is detected, the smart grounding device controls the metal grounding of the grounding fault phase, so as to reliably extinguish the arc; the smart grounding distribution system helps to solve the problem of single-phase grounding line selection and positioning difficulties in the small current grounding system, and the arc extinguishing is more reliable, which improves the relevant theories of insulation parameter measurement and grounding method selection and control of the distribution network, and reduces power outages and equipment damage caused by distribution network faults.

[0003] Announcement No. CN110444919A discloses a permanent pre-buried grounding body for an urban distribution network, wherein the four corners of the grounding grid are connected to four grounding pins, the four sides of the grounding grid are connected to four grounding modules through flat irons, the other ends of the four grounding modules are connected together through flat irons, the grounding grid is connected to a lead-in wire, the part of the lead-in wire extending above the ground is fixed to the pole by bolts, and a wiring port is provided at the upper end of the lead-in wire, and holes and notches are provided on the wiring port. The grounding module is welded to the connecting flat iron at its lower end, and the flat iron at the upper end of the grounding module is welded to the four sides of the grounding grid and anti-corrosion treatment is performed; four grounding pins are driven into the four corners of the grounding grid, the length of the grounding pins is 1.2-1.3m, the upper ends of the grounding pins are welded to the four corners of the grounding grid, a flat iron of suitable length is welded to one side or one corner of the grounding grid as a lead-in wire, the lead-in wire is fixed to the pole by bolts, and a wiring port is welded at the upper end of the lead-in wire.

[0004] During the installation of the grounding device, it is necessary to use electric welding to fix the various components and process the welded joints. In addition, in the absence of an external power supply, a diesel generator is also required, which increases the installation time of the grounding device and extends the construction period. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide a grounding protection device for a smart grid, and solve the technical problem in the prior art that various components of the grounding device need to be assembled on site by welding.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a grounding protection device for a smart grid, comprising a telescopic bracket, two limit assemblies and a conductive bar, the telescopic bracket having two telescopic ends that can approach or move away from each other; the two limit assemblies are respectively arranged at the two telescopic ends, the limit assembly comprises two limit brackets, the two limit brackets are respectively arranged on both sides of the telescopic bracket, and both can be rotatably connected to the telescopic bracket, when the limit bracket is rotated to be perpendicular to the telescopic bracket, a limit structure is formed between the limit bracket and the telescopic bracket, and the limit structure limits the limit bracket from continuing to rotate relative to the telescopic bracket; the conductive bar is detachably connected to the telescopic bracket; wherein the telescopic bracket, the limit bracket and the conductive bar are all conductive and electrically connected to each other.

[0007] In one embodiment, the telescopic bracket includes two telescopic plates and two fork arms, the two telescopic plates are arranged parallel to each other, the two fork arms are cross-arranged and hinged in the middle, one end of the two fork arms is hinged to the two telescopic plates, and the other end of the two fork arms is slidably connected to the other end of the two telescopic plates.

[0008] In one embodiment, a first sliding groove is formed at the other end of the telescopic plate along the length direction, and the other end of the fork arm is slidably connected to the first sliding groove.

[0009] In one embodiment, the limit bracket includes a limit plate, one end of which is rotatably connected to the telescopic plate. When the limit plate is rotated to be perpendicular to the telescopic plate, the limit plate abuts against the telescopic plate to limit the rotation of the limit plate relative to the telescopic plate.

[0010] In one embodiment, a second sliding groove is further provided at the other end of the telescopic plate along the length direction;

[0011] The limit bracket also includes a limit bar, one end of which is rotatably connected to the limit plate, and the other end of which is slidably connected to the second slide groove, and when the limit plate is rotated to be perpendicular to the telescopic plate, the limit bar slides against the inner wall of the end of the second slide groove to limit the rotation of the limit plate relative to the telescopic plate.

[0012] In one embodiment, the limiting assembly also includes a plurality of linearly arranged extension strips, one end of the extension strip having a first connecting structure and the other end having a second connecting structure, the second connecting structure cooperates with the first connecting structure, and the adjacent extension strips can be detachably connected to the first connecting structure via the second connecting structure, and the extension strip located at the end is detachably connected to the side of the limiting plate away from the telescopic plate via the first connecting structure.

[0013] In one embodiment, the extension strip includes a metal conductor and a graphite wrapping layer, one end of the metal conductor is provided with an external thread along the axial direction, and the other end is provided with a threaded hole along the axial direction, the external thread at one end of the metal conductor is the first connection structure, and the threaded hole at the other end of the metal conductor is the second connection structure; the graphite wrapping layer is sleeved on the metal conductor.

[0014] In one embodiment, the limiting assembly further includes a connector, which can be connected to the extension strip and inserted into the soil layer.

[0015] In one embodiment, the connector includes two limit plates and an insertion rod, the limit plate is provided with a mounting hole relative to the metal conductor, the limit plate is mounted on the metal conductor through the mounting hole, and the two limit plates are arranged between two adjacent extension strips and respectively abut against the graphite wrapping layer of the extension strips, a receiving groove is formed between the two limit plates, the insertion rod is U-shaped, the open end of the insertion rod is a pointed end, the insertion rod is sleeved on the metal conductor and can be slidably inserted in the receiving groove, the insertion rod is electrically connected to the metal conductor through the limit plate, and the tip of the insertion rod is used to be inserted into the soil layer.

[0016] In one embodiment, a limiting hole is formed on one side of the limiting piece, and a limiting protrusion is arranged on the other side opposite to the limiting hole. Among the two limiting pieces, the limiting protrusion of one limiting piece is plugged into the limiting hole of the other limiting piece.

[0017] Compared with the prior art, the beneficial effects of the present invention include: during transportation, the two limit brackets are rotated to fit the telescopic bracket, and the two telescopic ends of the telescopic bracket are brought close to each other to fit together. At this time, the size occupied by the grounding protection device is relatively small, which is convenient for transportation. After the grounding protection device is transported to the preset installation position, an installation groove is excavated in the soil layer, and the two telescopic ends of the telescopic bracket are telescoped in directions away from each other, and then the limit brackets on both sides of the telescopic bracket are rotated so that the limit brackets are rotated to be perpendicular to the telescopic bracket. At this time, a limit structure is formed between the limit bracket and the telescopic bracket, and the limit structure can limit the rotation of the limit bracket relative to the telescopic bracket, so that the limit bracket and the telescopic bracket form a T-shaped whole, and then the conductive bar is connected to the telescopic bracket. During the assembly process of the grounding protection device, there is no need to use welding for splicing, there are no welding points, and the parts that need to be treated with anti-corrosion. The parts can be processed in advance and do not need to be processed on the construction site, which can reduce the construction period and eliminate the unstable effects caused by manual welding and artificial anti-corrosion treatment, ensuring consistent construction quality. After the grounding protection device is deployed, the soil is filled into the installation groove, and the soil can fill the cavity in the installation groove. In addition, the T-shaped structure formed by the limit bracket and the telescopic bracket can limit the telescopic bracket from sliding outward when an external force tries to pull the telescopic bracket out of the installation groove, so as to avoid being directly pulled out of the soil. At the same time, the telescopic bracket arranged in the vertical direction and the limit bracket arranged in the horizontal direction increase the contact between the grounding protection device and the soil layer, and can increase the conductivity of the telescopic bracket, the limit bracket and the conductive bar, and contact the soil layer, increase the grounding length, and disperse the grounding bodies, which can effectively reduce the grounding resistance. Reducing the grounding resistance helps to improve the system's lightning resistance and reduce electrical faults caused by lightning strikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of a grounding protection device for a smart grid according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0020] Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0021] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0022] Figure 5 is a structural schematic diagram of a grounding protection device for a smart grid according to an embodiment of the present invention;

[0023] Figure 6 yes Figure 5 A partial enlarged schematic diagram of point D in the middle;

[0024] Figure 7 is a structural schematic diagram of a grounding protection device for a smart grid according to an embodiment of the present invention;

[0025] Figure 8 It is a partial cross-sectional view of an extension bar and a connector in a grounding protection device for a smart grid according to an embodiment of the present invention;

[0026] Fig. 9 yes Figure 8 A partial enlarged schematic diagram of point E in the middle;

[0027] Fig.10 It is an exploded view of an extension bar and a connector in a grounding protection device for a smart grid according to an embodiment of the present invention;

[0028] Fig.11 It is a structural schematic diagram of a limit plate and a support plate in a grounding protection device for a smart grid according to an embodiment of the present invention;

[0029] Fig.12 It is an exploded view of an extension bar in a grounding protection device for a smart grid according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] Telescopic bracket 1;

[0032] Telescopic plate 11;

[0033] First chute 11a;

[0034] Second chute 11b;

[0035] Fork arm 12;

[0036] Limiting component 2;

[0037] Limiting bracket 21;

[0038] Limiting plate 211;

[0039] Limiting strip 212;

[0040] Slider 213;

[0041] Extension strip 22;

[0042] A first connecting structure 22a;

[0043] A second connecting structure 22b;

[0044] Metal conductor 221;

[0045] Graphite wrap 222;

[0046] Connector 23;

[0047] Limiting piece 231;

[0048] Accommodating groove 231a;

[0049] Insertion rod 232;

[0050] Limiting protrusion 233;

[0051] Support sheet 234;

[0052] Dial block 235;

[0053] plane 235a;

[0054] Conductive bar 3;

[0055] Limiting structure a. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0057] like Figure 1 and Figure 2 As shown, the present invention provides a grounding protection device for a smart grid, comprising a telescopic bracket 1, two limit assemblies 2 and a conductive bar 3, wherein the telescopic bracket 1 has two telescopic ends that can approach or move away from each other; the two limit assemblies 2 are respectively arranged at the two telescopic ends, and the limit assemblies 2 include two limit brackets 21, which are respectively arranged on both sides of the telescopic bracket 1 and can be rotatably connected to the telescopic bracket 1. When the limit bracket 21 is rotated to be perpendicular to the telescopic bracket 1, a limit structure a is formed between the limit bracket 21 and the telescopic bracket 1, and the limit structure a limits the limit bracket 21 from continuing to rotate relative to the telescopic bracket 1; the conductive bar 3 is detachably connected to the telescopic bracket 1; wherein the telescopic bracket 1, the limit bracket 21 and the conductive bar 3 are all conductive and electrically connected to each other.

[0058] During transportation, the two limit brackets 21 are rotated to fit the telescopic bracket 1, and the two telescopic ends of the telescopic bracket 1 are brought close to each other to fit together. At this time, the size occupied by the grounding protection device is relatively small, which is convenient for transportation. After the grounding protection device is transported to the preset installation position, an installation groove is excavated in the soil layer, and the two telescopic ends of the telescopic bracket 1 are telescoped in the directions away from each other, and then the limit brackets 21 located on both sides of the telescopic bracket 1 are rotated so that the limit brackets 21 are rotated to be perpendicular to the telescopic bracket 1. At this time, a limit structure a is formed between the limit bracket 21 and the telescopic bracket 1, and the limit structure a can limit the rotation of the limit bracket relative to the telescopic bracket 1, so that the limit bracket 21 and the telescopic bracket 1 form a T-shaped whole, and then the conductive bar 3 is connected to the telescopic bracket 1. During the assembly process of the grounding protection device, there is no need to use welding for splicing, there is no welding point, and the parts that need to be treated with anti-corrosion can be pre-treated. The treatment is not required at the construction site, which can reduce the construction period, eliminate the unstable effects caused by manual welding and artificial anti-corrosion treatment, and ensure consistent construction quality; after the grounding protection device is deployed, the soil is filled into the installation groove, and the soil can fill the cavity in the installation groove. Moreover, the T-shaped structure formed by the limit bracket 21 and the telescopic bracket 1, when an external force tries to pull the telescopic bracket 1 out of the installation groove, the limit bracket 21 can limit the telescopic bracket 1 from sliding outward to avoid being directly pulled out of the soil; at the same time, the telescopic bracket 1 arranged in the vertical direction and the limit bracket 21 arranged in the horizontal direction increase the contact between the grounding protection device and the soil layer, and can increase the conductivity of the telescopic bracket 1, the limit bracket 21 and the conductive bar 3, and contact the soil layer, increase the grounding length, and disperse the grounding bodies, which can effectively reduce the grounding resistance; reducing the grounding resistance helps to improve the system's lightning resistance and reduce electrical faults caused by lightning strikes.

[0059] Among them, the conductive bar 3 is used for electrical connection of lightning protection grounding wire, protective grounding wire, anti-static grounding wire and anti-corrosion grounding wire; the conductive bar 3 can be detachably connected to the telescopic bracket 1 by bolts, screws and buckles.

[0060] It should be understood that the telescopic bracket 1, the two limit components 2 and the conductive bar 3 can be made of metal materials such as steel, aluminum and copper, and can also be made of non-metallic materials such as graphite. In one embodiment, the telescopic bracket 1, the limit components 2 and the conductive bar 3 have a composite structure of steel and graphite.

[0061] It should be understood that the telescopic bracket 1 can be a telescopic structure with a fork arm 12, or can be two brackets connected by a telescopic rod, etc. Figure 2As shown, in one embodiment, the telescopic bracket 1 includes two telescopic plates 11 and two fork arms 12, the two telescopic plates 11 are arranged parallel to each other, the two fork arms 12 are arranged crosswise and hinged in the middle, one end of the two fork arms 12 is hinged to the two telescopic plates 11, and the other end of the two fork arms 12 is slidably connected to the other end of the two telescopic plates 11. The two telescopic plates 11 are two telescopic ends of the telescopic bracket 1 that can move closer to or farther away from each other.

[0062] When the telescopic bracket 1 needs to be extended, the two telescopic plates 11 are controlled to move closer to or farther from each other, the two fork arms 12 in the telescopic bracket 1 are hinged and the other end of the telescopic plate 11 slides relative to the telescopic plate 11, so as to achieve the extension and closing of the telescopic bracket 1. The telescopic bracket 1 does not adopt a welding structure, and no on-site welding is required. Among them, the conductive bar 3 can be detachably connected to the telescopic plate 11 by bolts, screws and buckles.

[0063] It should be understood that the fork arm 12 and the telescopic plate 11 can be slidably connected by means of a sliding groove slider, a slider and a guide rod, etc. Specifically, Figure 7 As shown, in one embodiment, a first sliding groove 11 a is provided at the other end of the telescopic plate 11 along the length direction, and the other end of the fork arm 12 is slidably connected to the first sliding groove 11 a.

[0064] When the two telescopic plates 11 move closer to or farther from each other, one end of the two fork arms 12 rotates relative to the telescopic plates 11 , and the other end slides relative to the telescopic plates 11 .

[0065] It should be understood that when the limit bracket 21 rotates to be perpendicular to the telescopic bracket 1, the limit can be achieved by the limit bracket 21 abutting against the telescopic bracket 1. A limit pin can also be set after the limit bracket 21 rotates to be perpendicular to the telescopic bracket 1, and the telescopic bracket 1 is restricted from further rotating relative to the limit bracket 21 by the limit pin. Specifically, Figure 2 , 4 As shown in Figures 5 and 6, in one embodiment, the limiting bracket 21 includes a limiting plate 211, one end of which is rotatably connected to the telescopic plate 11. When the limiting plate 211 is rotated to be perpendicular to the telescopic plate 11, the limiting plate 211 abuts against the telescopic plate 11 to limit the rotation of the limiting plate 211 relative to the telescopic plate 11.

[0066] When the grounding protection device needs to be folded, the limit plate 211 is rotated so that the limit plate 211 rotates to fit the telescopic plate 11; when the grounding protection device needs to be unfolded, the limit plate 211 is rotated to be perpendicular to the telescopic plate 11. At this time, the limit plate 211 abuts against the telescopic plate 11 in the direction in which it continues to rotate, forming a limit structure a, which can limit the telescopic plate 11 from continuing to rotate relative to the telescopic plate 11.

[0067] In order to achieve a stable connection structure between the limit strip 212 and the telescopic plate 11, for this purpose, as shown in FIG. Figure 7 As shown, in one of the embodiments, a second slide groove 11b is further provided at the other end of the telescopic plate 11 along the length direction; the limiting bracket 21 also includes a limiting bar 212, one end of which is rotatably connected to the limiting plate 211, and the other end is slidably connected to the second slide groove 11b, and when the limiting plate 211 is rotated to be perpendicular to the telescopic plate 11, the limiting bar 212 slides against the inner wall of the end of the second slide groove 11b to limit the rotation of the limiting plate 211 relative to the telescopic plate 11.

[0068] When the limit bracket 21 is unfolded, the limit plate 211 is rotated, and the limit plate 211 is rotated to be perpendicular to the telescopic plate 11. At this time, the limit plate 211 rotates and abuts the telescopic plate 11. During the rotation of the limit plate 211, the limit plate 211 drives the limit bar 212 to rotate, and the other end of the limit bar 212 slides relative to the second slide groove 11b of the telescopic plate 11. When the limit plate 211 is rotated to be perpendicular to the telescopic plate 11, the limit bar 212 slides and abuts against the end inner wall of the second slide groove 11b. At this time, the limit bar 212 can limit the telescopic plate 11 from continuing to rotate. At the same time, the limit bar 212 connects the telescopic plate 11 and the limit plate 211, so that the telescopic plate 11 and the limit plate 211 form an integral structure. When an external force pulls the limit plate 211 outward, the pulling force can be transmitted to the limit plate 211 through the telescopic plate 11 and the limit bar 212, so that the telescopic plate 11 and the limit plate 211 form a stable structure.

[0069] In order to realize that the other end of the limiting strip 212 can be slidably connected to the second sliding groove 11b, for this purpose, Figure 6 As shown, in one embodiment, the limiting bracket 21 further includes a slider 213 , the slider 213 is slidably disposed in the second slide groove 11 b , and the other end of the limiting bar 212 is hinged to the slider 213 .

[0070] like Fig. 9 As shown, in one of the embodiments, the limiting assembly 2 also includes a plurality of linearly arranged extension strips 22, one end of the extension strip 22 has a first connecting structure 22a, and the other end has a second connecting structure 22b, the second connecting structure 22b cooperates with the first connecting structure 22a, and the adjacent extension strips 22 can be detachably connected to the first connecting structure 22a via the second connecting structure 22b, and the extension strip 22 located at the end is detachably connected to the side of the limiting plate 211 away from the telescopic plate 11 via the first connecting structure 22a.

[0071] In this embodiment, by setting a plurality of linearly arranged extension strips 22, the plurality of linearly arranged extension strips 22 can extend the length of the limit bracket 21, thereby increasing the contact between the grounding protection device and the soil layer, which is beneficial to reducing the contact resistance. Moreover, the extension strip 22 and the limit plate 211 can be detachably connected to the limit plate 211 through the first connecting structure 22a of the extension strip 22, and adjacent extension strips 22 can be detachably connected through the first connecting structure 22a and the second connecting structure 22b, so that the number and length of the extension strips 22 can be set according to the soil quality of the soil layer and construction requirements, and can be set according to the on-site conditions.

[0072] It should be understood that the extension strip 22 can be made of metal materials such as copper, iron, and aluminum, as well as non-metal materials, for example. Fig. 9 and Fig.12 As shown, in one embodiment, the extension strip 22 includes a metal conductor 221 and a graphite wrapping layer 222, one end of the metal conductor 221 is provided with an external thread along the axial direction, and the other end is provided with a threaded hole along the axial direction, the external thread at one end of the metal conductor 221 is a first connection structure 22a, and the threaded hole at the other end of the metal conductor 221 is a second connection structure 22b; the graphite wrapping layer 222 is sleeved on the metal conductor 221.

[0073] In this embodiment, the extension strip 22 is configured as a combination of a metal conductor 221 and a graphite wrapping layer 222. Both the metal conductor 221 and the graphite wrapping layer 222 are conductors. The metal conductor 221 has good electrical conductivity and can effectively transmit current to ensure the normal operation of the grounding protection device. As an excellent conductive material, graphite further enhances the ability to conduct current. The graphite wrapping layer 222 can provide additional protection to prevent the metal conductor 221 from being damaged by environmental factors (such as humidity, chemical corrosion, etc.). Graphite itself has good corrosion resistance and can extend the service life of the metal conductor 221.

[0074] When the plurality of extension strips 22 extend along the setting direction of the limiting plate 211, as the extension direction becomes longer, when the soil is backfilled into the installation groove, the extension strips 22 may move relative to the installation groove, causing the extension strips 22 to deviate from the original fixing method. Figure 3 , 4 As shown in Figures 9, 10 and 11, in one embodiment, the limiting assembly 2 also includes a connector 23, which can be connected to the extension strip 22 and can be inserted into the soil layer.

[0075] In this embodiment, when it is necessary to fix the extension bar 22 arranged in the extension direction of the limit plate 211, the connector 23 is connected to the extension bar 22, and the extension bar 22 is inserted into the soil layer. The position of the extension bar 22 can be fixed by the connector 23; at the same time, the connector 23 extends the depth of the grounding protection device in the vertical direction. Extending the grounding depth can reduce the stray resistance of the soil, thereby reducing the grounding resistance.

[0076] It should be understood that the connector 23 can be any component capable of achieving the above functions, such as Figure 3 , 4 As shown in Figures 9, 10, and 11, in one embodiment, the connector 23 includes two limit plates 231 and an insertion rod 232. The limit plate 231 has a mounting hole relative to the metal conductor 221. The limit plate 231 is sleeved on the metal conductor 221 through the mounting hole, and the two limit plates 231 are arranged between two adjacent extension bars 22 and respectively abut against the graphite wrapping layer 222 of the extension bar 22. A receiving groove 231a is formed between the two limit plates 231. The insertion rod 232 is U-shaped, and the open end of the insertion rod 232 is a tip. The insertion rod 232 is sleeved on the metal conductor 221 and can be slidably inserted in the receiving groove 231a. The insertion rod 232 is electrically connected to the metal conductor 221 through the limit plate 231, and the tip of the insertion rod 232 is used to be inserted into the soil layer.

[0077] When connecting adjacent extension bars 22, the two limiting plates 231 are sleeved on the threaded ends of the metal conductor 221, and the two extension bars 22 are threadedly connected, so that the graphite sheaths 222 of the two extension bars 22 abut and clamp the two limiting plates 231, so that the two limiting plates 231 are fixed between the graphite sheaths 222 of the two extension bars 22, and the two limiting plates 231 are surrounded to form a receiving groove 231a, and then the insertion rod 232 is sleeved on the graphite sheath 222, and the tip of the insertion rod 232 is inserted into the soil layer, and the insertion rod 232 is inserted into the receiving groove 231a. At this time, the connection between the insertion rod 232 and the extension bar 22 is realized, and the movable position and direction of the extension bar 22 can be limited. Moreover, welding is not used between the connector 23 and the extension bar 22, and the two limiting plates 231, the insertion rod 232, the metal conductor 221 and the graphite sheath 222 are combined and fixed in the soil layer.

[0078] The two limiting pieces 231 are sleeved on the metal conductor 221 of the extension strip 22, and the two limiting pieces 231 can rotate circumferentially, which may cause the two limiting pieces 231 to be misaligned circumferentially, resulting in the need to form a receiving groove 231a between the two limiting pieces 231 for the insertion rod 232 to be installed. Fig.11As shown, in one embodiment, a limiting hole is formed on one side of the limiting piece 231, and a limiting protrusion 233 is arranged on the other side relative to the limiting hole. Among the two limiting pieces 231, the limiting protrusion 233 of one limiting piece 231 is plugged into the limiting hole of the other limiting piece 231.

[0079] In order to achieve the circumferential positioning and fixation of the two limiting plates 231, in this embodiment, the two limiting plates 231 are sleeved on the extension strip 22, and the limiting protrusion 233 of one limiting plate 231 is plugged into the limiting hole of the other limiting plate 231. After the plugging, the plug-in and circumferential limiting between the two limiting plates 231 are achieved, so that the two limiting plates 231 can be combined to form a complete accommodating groove 231a.

[0080] like Fig. 9 As shown, in one of the embodiments, the accommodating groove 231a is arc-shaped, and the cross-section of the accommodating groove 231a is along the direction close to the metal conductor 221, the cross-sectional size first decreases and then increases, and the two limiting plates 231 have elastic force to open in the direction away from each other and then return to the original position, the insertion rod 232 is conductive, and can be electrically connected to the metal conductor 221 through the limiting plates 231.

[0081] Through the above-mentioned arrangement, when the insertion rod 232 is inserted into the soil layer, the insertion rod 232 is inserted into the receiving groove 231a, and the insertion rod 232 first contacts the reduced-size portion of the two receiving grooves 231a, and the insertion rod 232 can stretch open the two limiting plates 231. When the insertion rod 232 enters the increased-size portion of the receiving groove 231a, the limiting plate 231 has a reset elastic force. Under the action of its own reset elastic force, the limiting plate 231 elastically fits the insertion rod 232, so that the limiting plate 231 and the insertion rod 232 are continuously electrically connected; and the elastic force provided by the unreset limiting plate 231 can force the insertion rod 232 to be inserted into the soil layer.

[0082] During the process of inserting the rod 232 into the receiving groove 231a, after the rod 232 is partially immersed in the receiving groove 231a, the portion of the rod 232 outside the receiving groove 231a is small, and it is not easy to push the rod 232 to continue to be inserted into the soil layer, and it is not easy to push the rod 232 deep into the receiving groove 231a. Figure 4 , 10, 11, in one embodiment, the central angle of the accommodating groove 231a is less than 180°, and the plug-in connector 23 further includes four supporting pieces 234 and two shifting blocks 235. The four supporting pieces 234 are arranged on both sides of the limiting piece 231 in pairs, and the two supporting pieces 234 located on both sides of the limiting piece 231 are respectively connected to the two limiting pieces 231. Notches are formed on the opposite sides of the two supporting pieces 234, and the two notches form fixing holes for the insertion rod 232 to pass through. The four supporting pieces 234 Support surfaces parallel to each other are formed, and the support surfaces are used to support the soil layer. Two shift blocks 235 are arranged on both sides of the insertion rod 232 and are respectively connected to the insertion rod 232. The two shift blocks 235 are arranged parallel to each other and are perpendicular to the opening direction of the insertion rod 232. The side of the shift block 235 away from the support plate 234 is a plane 235a, and when the shift block 235 slides between the two limit plates 231, the plane 235a abuts against the limit plate 231 and is perpendicular to the limit plate 231.

[0083] During the installation of the limiting piece 231, the limiting piece 231 is fitted onto the metal conductor 221 of the extension strip 22, and then the support pieces 234 on both sides of the limiting piece 231 are fitted to the bottom inner wall of the installation groove, and then the two limiting pieces 231 are clamped by the two extension strips 22, and the insertion rod 232 is set between the two limiting pieces 231, so that the insertion rod 232 passes through the two support pieces 234 through the fixing hole and is inserted into the soil layer, and the insertion rod 232 is gradually inserted into the receiving groove 231a. After the insertion rod 232 is inserted into the receiving groove 231a, the push blocks 235 on both sides of the insertion rod 232 push the insertion rod 232 to further insert into the receiving groove 231a. Since the receiving groove 231a is arc-shaped and the central angle is less than 180°, when the insertion rod 232 is inserted into the receiving groove 231a, the insertion rod 232 is pushed into the receiving groove 231a. When 232 is fully inserted into the receiving groove 231a and is limited, the shift block 235 slides between the two limiting pieces 231, which can prevent the shift block from being inserted between the two limiting pieces 231 and hindering the limiting pieces 231 from closing and hindering the limiting pieces 231 from fitting the insertion rod 232. Moreover, the side of the shift block 235 facing away from the supporting piece 234 is a plane 235a, and when the shift block 235 slides between the two limiting pieces 231, the plane 235a is perpendicular to the limiting pieces 231. At this time, the two limiting pieces 231 have elastic force to push the insertion rod 232 out of the receiving groove 231a, so that the plane 235a of the shift block 235 abuts against the end of the limiting piece 231, which can limit the shift block and the insertion rod 232 from loosening in the direction of leaving the soil layer.

[0084] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A grounding protection device for a smart grid, characterized in that: It comprises a telescopic bracket, two limit assemblies and a conductive bar, wherein the telescopic bracket has two telescopic ends that can move closer to or farther from each other; the two limit assemblies are respectively arranged at the two telescopic ends, and the limit assembly comprises two limit brackets, which are respectively arranged at both sides of the telescopic bracket and can be rotatably connected to the telescopic bracket, and when the limit bracket is rotated to be perpendicular to the telescopic bracket, a limit structure is formed between the limit bracket and the telescopic bracket, and the limit structure limits the limit bracket from continuing to rotate relative to the telescopic bracket; the conductive bar is detachably connected to the telescopic bracket; wherein the telescopic bracket, the limit bracket and the conductive bar are all conductive and electrically connected to each other; The telescopic bracket includes two telescopic plates, which are arranged parallel to each other. The two telescopic plates are two telescopic ends of the telescopic bracket that can approach or move away from each other.

2. The grounding protection device for smart grid according to claim 1, characterized in that: The telescopic bracket also includes two fork arms, one end of the two fork arms is hinged to the two telescopic plates, and the other end of the two fork arms is slidably connected to the other end of the two telescopic plates.

3. The grounding protection device for smart grid according to claim 2, characterized in that: The other end of the telescopic plate is provided with a first sliding groove along the length direction, and the other end of the fork arm is slidably connected to the first sliding groove.

4. The grounding protection device for smart grid according to claim 2, characterized in that: The limiting bracket includes a limiting plate, one end of which is rotatably connected to the telescopic plate. When the limiting plate is rotated to be perpendicular to the telescopic plate, the limiting plate abuts against the telescopic plate to limit the rotation of the limiting plate relative to the telescopic plate.

5. The grounding protection device for smart grid according to claim 4, characterized in that: The other end of the telescopic plate is also provided with a second sliding groove along the length direction; The limit bracket also includes a limit bar, one end of which is rotatably connected to the limit plate, and the other end of which is slidably connected to the second slide groove, and when the limit plate is rotated to be perpendicular to the telescopic plate, the limit bar slides against the inner wall of the end of the second slide groove to limit the rotation of the limit plate relative to the telescopic plate.

6. The grounding protection device for smart grid according to claim 4, characterized in that: The limiting assembly also includes a plurality of linearly arranged extension bars, one end of the extension bar having a first connection structure and the other end having a second connection structure, the second connection structure cooperates with the first connection structure, and the adjacent extension bars can be detachably connected to the first connection structure via the second connection structure, and the extension bar located at the end is detachably connected to the side of the limiting plate away from the telescopic plate via the first connection structure.

7. The grounding protection device for smart grid according to claim 6, characterized in that: The extension strip includes a metal conductor and a graphite wrapping layer, one end of the metal conductor is provided with an external thread along the axial direction, and the other end is provided with a threaded hole along the axial direction, the external thread at one end of the metal conductor is the first connection structure, and the threaded hole at the other end of the metal conductor is the second connection structure; the graphite wrapping layer is sleeved on the metal conductor.

8. The grounding protection device for smart grid according to claim 7, characterized in that: The limiting assembly also includes a connector, which can be connected to the extension strip and can be inserted into the soil layer.

9. The grounding protection device for smart grid according to claim 8, characterized in that: The connector includes two limit plates and an insertion rod. The limit plate is provided with a mounting hole relative to the metal conductor. The limit plate is sleeved on the metal conductor through the mounting hole. The two limit plates are arranged between two adjacent extension strips and respectively abut against the graphite wrapping layers of the extension strips. A receiving groove is formed between the two limit plates. The insertion rod is U-shaped, and the open end of the insertion rod is a pointed end. The insertion rod is sleeved on the metal conductor and can be slidably inserted in the receiving groove. The insertion rod is electrically connected to the metal conductor through the limit plate, and the pointed end of the insertion rod is used to be inserted into the soil layer.

10. The grounding protection device for smart grid according to claim 9, characterized in that: A limiting hole is formed on one side of the limiting piece, and a limiting protrusion is arranged on the other side opposite to the limiting hole. Among the two limiting pieces, the limiting protrusion of one limiting piece is plugged into the limiting hole of the other limiting piece.

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