Resistance reducing device for grounding grid of transformer substation

Abstract

The invention provides a transformer substation grounding grid resistance reduction device, which belongs to the technical field of electric power engineering resistance reduction, and comprises a coke layer, a plurality of groups of grounding electrode ring feed rods, a plurality of groups of hot melting welding discs and a plurality of connecting discs, the plurality of groups of grounding electrode ring feed rods are arranged in the coke layer and are arranged around a grounding power grid array; the plurality of groups of hot melting welding discs are in one-to-one correspondence with the plurality of groups of grounding electrode ring feed rods; a plurality of diversion cables are welded on each group of hot melting welding discs, the upper ends of the plurality of diversion cables are electrically connected with a grounding power grid through the hot melting welding discs, and the lower ends of the plurality of diversion cables are electrically connected with grounding electrode ring feed rods corresponding to the hot melting welding discs; the multiple connecting discs correspond to the multiple sets of hot melting welding discs one to one and are fixed to the bottoms of the corresponding hot melting welding discs. And a plurality of groups of clamping assemblies in one-to-one correspondence with the plurality of diversion cables are arranged in each connecting disc. According to the resistance reducing device for the grounding grid of the transformer substation, the connection strength of the connection position of the diversion cable can be effectively protected, and the problem of safety accidents caused by poor grounding is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of resistance reduction in electric power engineering, and more specifically, relates to a resistance reduction device for a substation grounding network. Background Art

[0002] The reliable operation of the power system and the personal safety of substation workers are closely related to the safety of the grounding system of the substation or booster station. Among them, grounding resistance, step voltage and contact voltage are important technical indicators of the substation grounding system. With the increase of short-circuit capacity of the power system, how to reduce grounding resistance and reduce safety accidents caused by poor grounding has attracted much attention.

[0003] In the prior art, the current of the grounding grid is often guided to the low resistivity area by expanding the grounding drainage area, injecting resistance reducing agents, etc. However, the buried drainage line is easily affected by the gravity of the backfill material during the backfilling process, resulting in poor contact or breakage of the connection end of the drainage line; and after the resistance reduction device has been used for a period of time, the stress conditions on the drainage line will change with hydrogeological changes such as soil layer migration or rain impact, causing the drainage line to be further compressed or stretched, resulting in poor contact or even breakage of the connection end, thereby affecting the resistance reduction effect of the resistance reduction device. Summary of the invention

[0004] The purpose of the present invention is to provide a substation grounding grid resistance reduction device, aiming to solve the technical problem that the drainage line of the existing resistance reduction device has poor contact or even breaks due to backfill pressure and hydrogeological reasons, thereby affecting the resistance reduction effect.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a substation grounding network resistance reduction device, comprising:

[0006] A coke layer is arranged around the outer periphery of the grounding grid and placed in the soil layer;

[0007] A plurality of groups of grounding electrode ring feeder rods are arranged in the coke layer and surround the grounding grid array;

[0008] A plurality of groups of hot-melt welding discs corresponding to the plurality of groups of grounding electrode ring feeder rods one by one; a plurality of guide cables are welded on each group of the hot-melt welding discs, and the upper ends of the plurality of guide cables are electrically connected to the grounding grid through the hot-melt welding discs, and the lower ends are electrically connected to the grounding electrode ring feeder rods corresponding to the hot-melt welding discs; and

[0009] A plurality of connection plates correspond one-to-one to the plurality of groups of the hot-melt welding plates and are fixed at the bottom of the corresponding hot-melt welding plates; a plurality of clamping assemblies corresponding one-to-one to the plurality of the guide cables are arranged in each of the connection plates, and the clamping assemblies are used to clamp the guide cable after the upper end of the guide cable is fixed to the hot-melt welding plate.

[0010] In a possible implementation, the clamping assembly includes:

[0011] A plurality of clamping parts are arranged in the connection plate and correspond to the plurality of guide cables one by one; each of the clamping parts abuts against the outer peripheral wall of the corresponding guide cable;

[0012] A plurality of clamping blocks correspond to the plurality of clamping parts one by one and are arranged on both radial sides of the guide cable opposite to the corresponding clamping parts; the clamping blocks are slidably connected in the connection disk along the radial direction of the connection disk.

[0013] In some embodiments, a plurality of slide grooves corresponding to the plurality of clamping blocks are provided in the connection disk, the slide grooves pass through the bottom of the connection disk and extend radially along the connection disk; the clamping blocks are slidably connected in the corresponding slide grooves.

[0014] Exemplarily, the clamping block comprises:

[0015] A sliding column is vertically arranged in the sliding groove and slides in the corresponding sliding groove;

[0016] an upper clamping block, disposed at the upper end of the sliding column, and used to clamp the guide cable with the corresponding clamping portion; and

[0017] The limiting block is arranged at the lower end of the sliding column and is limited at the bottom of the sliding groove.

[0018] In a possible implementation, the clamping assembly further includes:

[0019] A mounting plate, disposed on a side of the connection plate away from the hot melt welding plate;

[0020] The driving assembly is arranged in the installation disk and is respectively connected to the lower ends of the plurality of clamping blocks, and is used for driving the corresponding clamping blocks to slide radially along the connection disk.

[0021] In some embodiments, the drive assembly includes:

[0022] A rotating shaft is screwed into the mounting plate, and one end of the rotating shaft is screwed downward out of the mounting plate;

[0023] A wire take-up drum is fixed to the upper end of the rotating shaft and is placed in the mounting disk; the wire take-up drum can rotate along with the rotating shaft;

[0024] A plurality of tensioning members corresponding to the plurality of guide cables one by one; one end of each of the tensioning members is connected to the lower end of one of the clamping blocks, and the other end is fixed to the take-up drum;

[0025] Wherein, when the lower end of the rotating shaft is rotated, the take-up drum rotates along with the rotating shaft and drives the tensioning member to be tensioned, so that the clamping block is clamped on the radial outer side of the guide cable.

[0026] Exemplarily, a plurality of guide grooves corresponding one-to-one to the plurality of tensioning members are provided in the mounting disk, and the guide grooves extend radially along the mounting disk; a limiting ring is also provided in the mounting disk, and the limiting ring is provided at the top of the guide groove and placed below the clamping portion; wherein the tensioning member is slidably tensioned in the guide groove.

[0027] In a possible implementation, a plurality of line boxes corresponding to the plurality of guide cables are provided at the bottom of each connection plate, the guide cables are inserted into the line boxes to form a stacked layer, and the lower ends extend out of the line boxes and are electrically connected to the grounding electrode ring feeding rod.

[0028] In a possible implementation, each of the grounding ring feeder bars is provided with a plurality of mounting rings, the plurality of mounting rings are spaced apart along the axial direction of the grounding ring feeder bar, and each of the guide cables passes through a mounting ring and is electrically connected to the grounding ring feeder bar.

[0029] Exemplarily, the plurality of mounting rings are spaced at different intervals in the axial direction of the grounding electrode ring feed rod.

[0030] Compared with the prior art, the solution shown in the embodiment of the present application is improved by laying a coke layer on the periphery of the grounding grid, and arranging a guide cable and a grounding electrode ring feeding rod, so as to realize drainage of the grounding grid in the low resistivity area; by arranging a hot-melt welding disk to electrically connect multiple guide cables to the grounding grid, it is convenient to drain from the hot-melt welding disk, and the setting of the hot-melt welding disk can facilitate the centralized connection of multiple drainage cables, thereby improving the connection efficiency; by arranging a connection disk and a clamping assembly to clamp the connection of the guide cable, it is avoided that the guide cable is tensioned or even broken at the connection under the influence of backfill pressure and hydrogeological changes, thereby detaching from the hot-melt welding disk, which can effectively protect the connection strength of the guide cable connection, avoid safety accidents caused by poor grounding, and effectively ensure the grounding resistance reduction effect of the grounding grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1A schematic diagram of the connection structure between one of the grounding electrode ring feeder rods and the grounding grid of the substation grounding grid resistance reduction device provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the internal structure of a connection disk provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of the slide groove on the connecting plate provided in an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the internal structure of the installation disk provided in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the longitudinal cross-sectional structure of a connection disk and a mounting disk provided in an embodiment of the present invention.

[0037] In the figure: 1. grounding grid; 2. grounding electrode ring feeding rod; 21. mounting ring; 3. hot melt welding disk; 4. connecting disk; 41. slide groove; 5. clamping assembly; 51. clamping plate; 511. clamping part; 52. clamping block; 521. slide column; 522. upper clamping block; 523. limit block; 6. guide cable; 7. mounting disk; 71. guide groove; 72. limit ring; 8. drive assembly; 81. rotating shaft; 82. take-up drum; 83. tensioner; 9. wire box. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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.

[0039] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0041] Please also read Figures 1 to 5 Now, the substation grounding grid resistance reduction device provided by the present invention is described. The substation grounding grid resistance reduction device includes a coke layer, multiple groups of grounding electrode ring feeder rods 2, multiple groups of hot-melt welding discs 3 and multiple connecting discs 4; the coke layer is arranged around the outer periphery of the grounding grid 1 and placed in the soil layer; multiple groups of grounding electrode ring feeder rods 2 are arranged in the coke layer and arranged in an array around the grounding grid 1; multiple groups of hot-melt welding discs 3 correspond to multiple groups of grounding electrode ring feeder rods 2 one by one; multiple guide cables 6 are welded on each group of hot-melt welding discs 3, and the upper ends of the multiple guide cables 6 are electrically connected to the grounding grid 1 through the hot-melt welding discs 3, and the lower ends are electrically connected to the grounding electrode ring feeder rods 2 corresponding to the hot-melt welding discs 3; multiple connecting discs 4 correspond to multiple groups of hot-melt welding discs 3 one by one, and are fixed at the bottom of the corresponding hot-melt welding discs 3; multiple groups of clamping components 5 corresponding to multiple guide cables 6 are arranged in each connecting disc 4, and the clamping components 5 are used to clamp the guide cable 6 after the upper end of the guide cable 6 is fixed to the hot-melt welding disc 3.

[0042] It should be noted that the appendix to this application Figure 1 Only the connection structure between one of the grounding electrode ring feeder rods 2 of the transformer substation grounding grid resistance reduction device and the grounding grid 1 is shown. In fact, there are multiple groups of similar connection structures arranged around the corresponding grounding grid 1, which are not drawn one by one here.

[0043] It should be understood that the hot melt welding plate 3 provided in the present application can centrally weld multiple guide cables 6, which can effectively improve the connection efficiency of the guide cables 6 compared to the dispersed connection of each guide cable 6, and it is convenient to set the connection plate 4 and the clamping assembly 5 so as to clamp the connection end of the guide cable 6 to ensure the connection strength.

[0044] It should be understood that the physical and chemical properties of coke are stable after high temperature, and its resistivity is extremely low. Optionally, a coke layer with a depth of 1.5-2 meters is laid around the grounding grid, and the coke layer is deeply buried in the soil. The depth of the coke layer in the soil can be set according to actual needs.

[0045] Specifically, the grounding electrode ring feeding rod 2 adopts an alloy feeding element, and the resistance reduction effect can be effectively improved through the combined effect of the alloy feeding element and the coke layer; optionally, the alloy feeding element material adopts the most advanced centrifugal casting method, and is buried in the coke layer and distributed around the grounding grid.

[0046] Furthermore, the guide cable 6 is a cross-linked polyethylene insulated sheathed cable, and is arranged in groups. The guide cable 6 is exothermically welded to the grounding grid 1 through a hot melt welding plate 3, and the specific structure and working principle of the hot melt welding plate 3 can be known according to the prior art, and will not be repeated here; optionally, epoxy resin molding and sealing are used after welding to overcome the electrochemical corrosion between copper and steel.

[0047] Compared with the prior art, the substation grounding grid resistance reduction device provided by the present invention lays a coke layer on the periphery of the grounding grid 1, and sets a guide cable 6 and a grounding electrode ring feeding rod 2, so as to realize drainage of the grounding grid 1 in the low resistivity area, thereby improving the resistance reduction effect; sets a hot-melt welding disc 3 to electrically connect multiple guide cables 6 to the grounding grid 1, thereby facilitating drainage from the hot-melt welding disc 3, and the setting of the hot-melt welding disc 3 can facilitate centralized connection of multiple drainage cables, thereby improving the connection efficiency; sets a connection disc 4 and a clamping assembly 5 to clamp the connection of the guide cable 6, so as to avoid the guide cable 6 being tensioned or even broken at the connection under the influence of backfill pressure and hydrogeological changes, thereby detaching from the hot-melt welding disc 3, which can effectively protect the connection strength of the guide cable 6 connection, avoid safety accidents caused by poor grounding, and effectively ensure the grounding resistance reduction effect of the grounding grid 1.

[0048] Optionally, a first accommodating cavity is provided in the connecting disk 4, the clamping assembly 5 is provided in the first accommodating cavity, and a plurality of guide cables 6 are inserted into the first accommodating cavity along the circumference of the connecting disk 4 and are clamped by the corresponding clamping assemblies 5, and the guide cables 6 pass through the clamping assembly 5 and pass out of the connecting disk 4 to be electrically connected to the grounding electrode ring feeding rod 2.

[0049] It should be understood that the electrical connection between the guide cable 6 and the hot melt welding plate 3 and the grounding ring feeder rod 2 in the present application realizes the current diversion into the coke layer, and the specific electrical connection method and principle belong to the prior art.

[0050] See also Figure 2 In some possible embodiments, the clamping assembly 5 includes a plurality of clamping portions 511 and a plurality of clamping blocks 52; the plurality of clamping portions 511 are arranged in the connecting disk 4 and correspond one-to-one to the plurality of guide cables 6; each clamping portion 511 abuts against the outer peripheral wall of the corresponding guide cable 6; the plurality of clamping blocks 52 correspond one-to-one to the plurality of clamping portions 511 and are arranged on both radial sides of the guide cable 6 opposite to the corresponding clamping portions 511; the clamping blocks 52 are connected to the connecting disk 4 by sliding along the radial direction of the connecting disk 4.

[0051] The clamping blocks 52 are used to clamp the corresponding clamping parts 511 on both sides of the corresponding guide cables 6. By providing multiple clamping parts 511 and multiple clamping blocks 52, the upper ends of multiple guide cables 6 are clamped correspondingly, so as to prevent the guide cables 6 from being separated from the hot-melt welding plate 3 under the action of external force, thereby affecting the drainage and resistance reduction effect.

[0052] Specifically, a clamping plate 51 is provided in the connecting disk 4 , and a plurality of clamping teeth protruding radially outwardly along the clamping plate 51 are provided on the outer peripheral wall of the clamping plate 51 , and the plurality of clamping teeth form the plurality of clamping portions 511 .

[0053] Optionally, a plurality of inner clamping blocks are arranged in the connection disk 4 , the plurality of inner clamping blocks correspond one-to-one to the plurality of clamping blocks 52 , and the plurality of inner clamping blocks are arranged axially at intervals around the connection disk 4 ; and the plurality of inner clamping blocks form the aforementioned plurality of clamping portions 511 .

[0054] The clamping block 52 can slide along the radial direction of the connection plate 4, and when the clamping block 52 slides, the clamping block 52 has a clamping state in which it slides to clamp the clamping portion 511 on both radial inner and outer sides of the guide cable 6, and the clamping block 52 also has a yielding state in which it slides away from the clamping portion 511 and one end of the guide cable 6. After the connection plate 4 is installed, the clamping block 52 is slid so that the clamping assembly 5 clamps the guide cable 6.

[0055] See also Figure 3 In some embodiments, a plurality of slide grooves 41 corresponding to a plurality of clamping blocks 52 are provided in the connection disk 4, the slide grooves 41 pass through the bottom of the connection disk 4 and extend radially of the connection disk 4; the clamping blocks 52 are slidably connected in the corresponding slide grooves 41.

[0056] The sliding groove 41 is provided so that the clamping block 52 can slide in the sliding groove 41 , thereby realizing the radial sliding of the clamping block 52 along the connecting disk 4 , thereby avoiding mutual interference between the sliding of the connecting disk 4 and the clamping block 52 .

[0057] See also Figure 3 Exemplarily, the clamping block 52 includes a sliding column 521, an upper clamping block 522 and a limit block 523; the sliding column 521 is vertically inserted into the slide groove 41 and slides in the corresponding slide groove 41; the upper clamping block 522 is arranged at the upper end of the sliding column 521, and is used to clamp the guide cable 6 with the corresponding clamping portion 511; the limit block 523 is arranged at the lower end of the sliding column 521, and is limited at the bottom of the slide groove 41.

[0058] Specifically, the sliding column 521 is used to facilitate the sliding of the clamping block 52 in the sliding groove 41, and the upper clamping block 522 is used to cooperate with the clamping part 511 to clamp the guide cable 6 to achieve the clamping of the connecting end of the guide cable 6; the limit block 523 is used to limit at the bottom of the connecting plate 4 to prevent the sliding column 521 and the upper clamping block 522 from sliding out of the sliding groove 41.

[0059] Optionally, the upper clamping block 522 is provided with an arc matching the guide cable 6 on the side facing the guide cable 6; the clamping portion 511 is also provided with an arc matching the upper clamping block 522 on the side facing the guide cable 6, so as to clamp the guide cable 6 and avoid mutual interference between the upper clamping block 522 and the clamping portion 511.

[0060] See also Figure 4 and 5 In some possible embodiments, the clamping assembly 5 also includes a mounting disk 7 and a driving assembly 8; the mounting disk 7 is arranged on a side of the connecting disk 4 away from the hot melt welding disk 3; the driving assembly 8 is arranged in the mounting disk 7 and is respectively connected to the lower ends of multiple clamping blocks 52, for driving the corresponding clamping blocks 52 to slide radially along the connecting disk 4.

[0061] The installation plate 7 is provided to conveniently hold the driving assembly 8 , and the driving assembly 8 is used to drive the plurality of clamping blocks 52 to slide radially along the connecting plate 4 , so that the clamping blocks 52 and the clamping parts 511 cooperate with each other to clamp the guide cable 6 .

[0062] Specifically, the driving assembly 8 is connected to the limit blocks 523 at the lower ends of the plurality of clamping blocks 52 respectively; or the driving assembly 8 is connected to the upper clamping blocks 522 at the upper ends of the clamping blocks 52 respectively.

[0063] As a specific embodiment of the above-mentioned driving assembly 8, optionally, the driving assembly 8 includes a plurality of rotating screws, the plurality of rotating screws are arranged at intervals around the axis of the mounting disk 7, and each rotating screw is screwed into the mounting disk 7 along the radial direction of the mounting disk 7, and is rotationally connected to the corresponding limit block 523.

[0064] Specifically, the rotating screw is rotatably connected to the limit block 523, and a push plate is provided on the rotating screw, the push plate is placed between the outer peripheral wall of the mounting disk 7 and the limit block 523, and one side of the push plate abuts against the outer radial wall of the limit block 523 along the radial direction of the mounting disk 7; when the rotating screw is rotated, the rotating screw is tightened along the radial direction of the mounting disk 7, and drives the push plate to move along the radial direction of the mounting disk 7. At the same time, the push plate pushes the limit block 523 to move along the radial direction of the mounting disk 7, thereby realizing the radial sliding of the clamping block 52 along the mounting disk 7. At this time, the sliding of each clamping block 52 requires the separate driving of each rotating screw.

[0065] See also Figure 4In some embodiments, the driving assembly 8 includes a rotating shaft 81, a take-up drum 82 and a plurality of tensioning members 83; the rotating shaft 81 is screwed into the mounting disk 7, and one end is screwed downward out of the mounting disk 7; the take-up drum 82 is fixed to the upper end of the rotating shaft 81 and is placed in the mounting disk 7; the take-up drum 82 can rotate with the rotating shaft 81; a plurality of tensioning members 83 correspond one by one to a plurality of guide cables 6; one end of each tensioning member 83 is connected to the lower end of one of the clamping blocks 52, and the other end is fixed on the take-up drum 82; wherein, when the lower end of the rotating shaft 81 is rotated, the take-up drum 82 rotates with the rotating shaft 81, and drives the tensioning member 83 to be tightened, so that the clamping block 52 is clamped on the radial outer side of the guide cable 6.

[0066] By rotating the rotating shaft 81, the rotating shaft 81 is rotated in and out of the mounting disk 7, and the wire take-up disk 82 is driven to rotate accordingly. When the wire take-up disk 82 rotates, the tensioning member 83 rotates with the wire take-up disk 82 and is wound around the wire take-up disk 82 to achieve the tensioning of the tensioning member 83, thereby pulling the clamping block 52 to slide along the length direction of the slide groove 41.

[0067] It should be understood that the distance between the clamping block 52 and the clamping portion 511 is not large. Therefore, when the tensioning member 83 is pulled, the sliding distance of the tensioning member 83 pulling the clamping block 52 is not large. Therefore, the winding length of the tensioning member 83 on the take-up drum 82 is only a small arc distance, rather than rotating around the take-up drum 82 for several circles.

[0068] Optionally, the tensioning member 83 is a steel wire rope, a tensioning cable, or a tensioning chain.

[0069] See also Figure 4 Exemplarily, a plurality of guide grooves 71 corresponding to the plurality of tensioning members 83 are provided in the mounting disk 7, and the guide grooves 71 extend radially along the mounting disk 7; a limiting ring 72 is also provided in the mounting disk 7, and the limiting ring 72 is provided at the top of the guide groove 71 and is placed below the clamping portion 511; wherein the tensioning member 83 is slidably tensioned in the guide groove 71.

[0070] The guide groove 71 is provided so that the tensioning member 83 is tightened in the guide groove 71; the limiting ring 72 is provided so that the tensioning member 83 can be reversed at the limiting ring 72, thereby guiding the tensioning direction of the tensioning member 83. Optionally, the lateral interface of the limiting ring 72 is circular, which can reduce the friction loss of the tensioning member 83.

[0071] See also Figure 5 In some possible embodiments, a plurality of line boxes 9 corresponding to the plurality of guide cables 6 are provided at the bottom of each connection plate 4. The guide cables 6 are inserted into the line boxes 9 to form a stacked layer, and the lower ends extend out of the line boxes 9 and are electrically connected to the grounding electrode ring feeding rod 2.

[0072] By providing the wire accommodating boxes 9, the guide cables 6 can be stacked in the corresponding wire accommodating boxes 9, thereby forming a stretching margin for the guide cables 6, thereby preventing the guide cables 6 from being forcibly broken by external forces.

[0073] See also Figure 1 In some possible embodiments, each grounding ring feeder rod 2 is provided with a plurality of mounting rings 21, and the plurality of mounting rings 21 are arranged at intervals along the axial direction of the grounding ring feeder rod 2, and each guide cable 6 passes through a mounting ring 21 and is electrically connected to the grounding ring feeder rod 2.

[0074] By providing the mounting ring 21, the connection end of the guide cable 6 and the grounding ring feed rod 2 can be conveniently protected to prevent damage to the connection end of the guide cable 6 and the grounding ring feed rod 2 by external water flow or soil, thereby extending the service life of the guide cable 6.

[0075] See also Figure 1 , illustratively, the multiple mounting rings 21 are spaced at different intervals in the axial direction of the grounding electrode ring feeding rod 2 .

[0076] The grounding fault current is mainly concentrated in the surrounding area of ​​the grounding grid 1. Therefore, in the present application, by distributing multiple mounting rings 21 at unequal intervals, the guiding points of the guide cable 6 can also be distributed at unequal intervals, so as to cope with different degrees of scattered current in the grounding grid 1. Specifically, for areas where the scattered current is more concentrated, multiple groups of guide cables 6 and mounting rings 21 can be concentratedly arranged. For areas where the scattered current is more widely distributed, the number of mounting rings 21 and guide cables 6 can be appropriately reduced. The specific number of mounting rings 21 and guide cables 6 can be set according to actual needs.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A substation grounding grid resistance reduction device, characterized in that: include: A coke layer is arranged around the outer periphery of the grounding grid (1) and is placed in the soil layer; A plurality of groups of grounding electrode ring feeder rods (2) are arranged in the coke layer and are arranged in an array around the grounding grid (1); A plurality of groups of hot-melt welding discs (3) corresponding one to one with the plurality of groups of grounding ring feeder rods (2); a plurality of current guide cables (6) are welded on each group of the hot-melt welding discs (3), and the upper ends of the plurality of current guide cables (6) are electrically connected to the grounding grid (1) through the hot-melt welding discs (3), and the lower ends are electrically connected to the grounding ring feeder rods (2) corresponding to the hot-melt welding discs (3); and A plurality of connection plates (4) correspond one-to-one to the plurality of groups of the hot-melt welding plates (3) and are fixed at the bottom of the corresponding hot-melt welding plates (3); a plurality of clamping assemblies (5) corresponding one-to-one to the plurality of the guide cables (6) are arranged in each of the connection plates (4), and the clamping assemblies (5) are used to clamp the guide cables (6) after the upper ends of the guide cables (6) are fixed to the hot-melt welding plates (3).

2. The substation grounding grid resistance reduction device according to claim 1, characterized in that: The clamping assembly (5) comprises: A plurality of clamping portions (511) are arranged in the connection plate (4) and correspond one-to-one to the plurality of guide cables (6); each clamping portion (511) abuts against the outer peripheral wall of the corresponding guide cable (6); A plurality of clamping blocks (52) correspond one-to-one to the plurality of clamping portions (511), and are arranged on both radial sides of the guide cable (6) opposite to the corresponding clamping portions (511); the clamping blocks (52) are slidably connected to the connection disk (4) along the radial direction of the connection disk (4).

3. The substation grounding grid resistance reduction device according to claim 2, characterized in that: The connection disk (4) is provided with a plurality of slide grooves (41) corresponding one to one with the plurality of clamping blocks (52); the slide grooves (41) penetrate to the bottom of the connection disk (4) and extend along the radial direction of the connection disk (4); the clamping blocks (52) are slidably connected in the corresponding slide grooves (41).

4. The substation grounding grid resistance reduction device according to claim 3, characterized in that: The clamping block (52) comprises: A sliding column (521) is vertically inserted into the sliding groove (41) and slides in the corresponding sliding groove (41); an upper clamping block (522), disposed at the upper end of the sliding column (521), and used to clamp the guide cable (6) with the corresponding clamping portion (511); and A limit block (523) is provided at the lower end of the slide column (521) and is limited at the bottom of the slide groove (41).

5. The substation grounding grid resistance reduction device according to claim 2, characterized in that: The clamping assembly (5) further comprises: A mounting plate (7) is arranged on a side of the connecting plate (4) away from the hot melt welding plate (3); The driving assembly (8) is arranged in the mounting plate (7) and is respectively connected to the lower ends of the plurality of clamping blocks (52) to drive the corresponding clamping blocks (52) to slide radially along the connecting plate (4).

6. The substation grounding grid resistance reduction device according to claim 5, characterized in that: The driving assembly (8) comprises: A rotating shaft (81) is screwed into the mounting plate (7), and one end of the rotating shaft is screwed downward out of the mounting plate (7); A wire take-up drum (82) is fixed to the upper end of the rotating shaft (81) and is placed in the mounting plate (7); the wire take-up drum (82) is capable of rotating along with the rotating shaft (81); A plurality of tensioning members (83) corresponding one to one with the plurality of guide cables (6); one end of each of the tensioning members (83) is connected to one of the clamping blocks (52), and the other end is fixed to the take-up reel (82); When the lower end of the rotating shaft (81) is rotated, the take-up drum (82) rotates along with the rotating shaft (81) and drives the tensioning member (83) to be tensioned, so that the clamping block (52) is clamped on the radial outer side of the guide cable (6).

7. The substation grounding grid resistance reduction device according to claim 6, characterized in that: The mounting plate (7) is provided with a plurality of guide grooves (71) corresponding one-to-one to the plurality of tensioning members (83), and the guide grooves (71) extend radially along the mounting plate (7); the mounting plate (7) is also provided with a limiting ring (72), and the limiting ring (72) is arranged at the top of the guide groove (71) and is placed below the clamping portion (511); wherein the tensioning member (83) is slidably tensioned in the guide groove (71).

8. The substation grounding grid resistance reduction device according to claim 1, characterized in that: A plurality of line boxes (9) corresponding one-to-one to the plurality of guide cables (6) are also provided at the bottom of each connection plate (4); the guide cables (6) are inserted into the line boxes (9) to form a stacked layer, and the lower ends extend out of the line boxes (9) and are electrically connected to the grounding electrode ring feeding rod (2).

9. The substation grounding grid resistance reduction device according to claim 1, characterized in that: A plurality of mounting rings (21) are provided on each grounding ring feeder bar (2), the plurality of mounting rings (21) are arranged at intervals along the axial direction of the grounding ring feeder bar (2), and each current guide cable (6) passes through one mounting ring (21) and is electrically connected to the grounding ring feeder bar (2).

10. The substation grounding grid resistance reduction device according to claim 9, characterized in that: The plurality of mounting rings (21) are spaced at different intervals in the axial direction of the grounding electrode ring feeding rod (2).

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