Cable grounding box

Abstract

This invention relates to the field of power transmission cable technology, and more particularly to a cable grounding box, comprising: a box body and a busbar; the box body is cylindrical, and openings are provided around the side walls of the box body for the passage of each phase grounding cable and the main grounding cable; the busbar is located at the center of the bottom surface of the box body and is respectively connected to each phase grounding cable and the main grounding cable. This invention addresses the shortcomings of existing technologies, such as the high cost caused by the need for long busbars in cable grounding boxes, the inconvenience of construction due to the fixed installation angle of the three-phase grounding cables, and the defects of excessively long or small bending radii of grounding cables. It achieves a cable grounding box design with fewer busbars and multi-directional cable entry, thereby effectively reducing the cost of the cable grounding box and facilitating installation.

Description

Technical Field

[0001] This invention relates to the field of power transmission cable technology, and more particularly to a cable grounding box. Background Technology

[0002] Cable grounding boxes are one of the main pieces of equipment in single-core power transmission cable grounding systems. They are divided into direct grounding boxes, protective grounding boxes, and cross-interconnection boxes. Currently, cable grounding boxes are generally rectangular in shape and contain busbars.

[0003] like Figures 2 to 4 As shown, all three types of cable grounding boxes have three incoming lines and one outgoing line. The three incoming lines are three-phase grounding cables, and the one outgoing line is the main grounding cable. Among them, in... Figure 2 In the direct grounding box shown, the three-phase grounding cables are connected to the busbars, and then connected to the earth via the main grounding cable. For example... Figure 3 The protective grounding box shown is based on a direct grounding box, with an additional sheath voltage protector installed between each phase grounding cable and the busbar. And as... Figure 4 The cross-connection box shown contains six terminals. The top three terminals are connected to the cores of the three coaxial grounding cables, and the bottom three terminals are connected to the shielding layer of the three coaxial grounding cables. Then, three transposed copper busbars are used to connect two terminals respectively.

[0004] Therefore, regardless of the type of cable grounding box, at least one busbar with a width close to that of the box needs to be installed inside. At the same time, the cable needs to enter from the bottom of the box, which not only increases the cost but also limits the installation angle, making it easy for the grounding cable to be too long or have too small a bending radius. Summary of the Invention

[0005] This invention provides a cable grounding box to solve the problems of high cost and inconvenient installation caused by the need for long busbars in existing cable grounding boxes. It realizes a cable grounding box design with fewer busbars and multi-directional cable entry, thereby effectively reducing the cost of cable grounding boxes and facilitating installation.

[0006] This invention provides a cable grounding box, comprising: a box body and a busbar copper component;

[0007] The enclosure is cylindrical, and openings are provided around the side walls of the enclosure for the passage of each phase grounding cable and the main grounding cable;

[0008] The busbar copper component is located at the center of the bottom surface of the box body and is connected to the grounding cable of each phase and the main grounding cable respectively.

[0009] According to the cable grounding box of the present invention, an opening is provided on the upper surface of the box body, a cover is provided on the opening, the cover is screwed to the box body, and a first sealing gasket is provided between the cover and the box body.

[0010] According to the cable grounding box of the present invention, when the cable grounding box is a protective grounding box or a cross-interconnection box, the cable grounding box further includes: 3 sheath voltage protectors;

[0011] The three sheath voltage protectors are respectively connected between the bus copper component and the grounding cable of each phase.

[0012] According to the cable grounding box of the present invention, the busbar copper component is provided with three first connection terminals and one second connection terminal;

[0013] The three first connection terminals are distributed at 120° intervals with the center of the three terminals as the center, and each first connection terminal is provided with a first connection part for connecting the wire core of the grounding cable of each phase or the sheath voltage protector.

[0014] After the conductor of each phase of the grounding cable is connected to the second connection part, it is connected to the corresponding sheath voltage protector or the first connection part through the second connection part.

[0015] According to the cable grounding box of the present invention, when the cable grounding box is the cross-interconnection box, the bus copper component is connected to the bottom surface of the box body in a manner that is rotatable relative to the center position;

[0016] The first connecting part is configured as a columnar connecting rod;

[0017] The bottom end of the connecting rod is connected to the sheath voltage protector, and the top end extends upward in a direction perpendicular to the bottom surface of the housing; a through hole is provided on the side wall of the connecting rod; a groove is provided at the top end of the connecting rod extending towards another connecting rod.

[0018] By inserting the second connecting portion of the conductor connected to the end of the grounding cable into the corresponding through hole, connecting the side wall of the connecting rod, and after accommodating the shielding layer of the grounding cable in the groove with the same orientation as the through hole into which the grounding cable is inserted, the crimp cap and the connecting rod above the groove are bolted together, thereby achieving the connection between the conductor of any phase of the grounding cable and the shielding layer of the adjacent phase of the grounding cable and the sheath voltage protector.

[0019] According to the cable grounding box of the present invention, the openings include a plurality of openings evenly arranged at a preset distance on the side wall of the box body; each opening is provided with a cover plate;

[0020] A plurality of connectors are provided around the outer edge of the cover plate for connecting the cover plate to the opening.

[0021] According to the cable grounding box of the present invention, a second sealing gasket is provided between the cover plate and the opening.

[0022] According to the cable grounding box of the present invention, the distance between two adjacent openings is greater than a preset insulation distance, wherein the preset insulation distance is the minimum insulation distance between the exposed cores at the ends of each phase of the grounding cable.

[0023] The cable grounding box according to the present invention further includes: a connecting pipe;

[0024] The connecting pipe is a combined pipe fitting composed of a rigid pipe and a flexible pipe; wherein, the diameter of the rigid pipe is fixed, the flexible pipe is elastic so that the diameter can be changed, and the flexible pipe is disposed between two sections of the rigid pipe.

[0025] The rigid tube located at the first end of the connecting tube is detachably connected to the opening where the cover plate has been removed;

[0026] The soft tube is a tapered tube with an opening that gradually increases from the first end to the second end. The end of the soft tube with the larger opening is connected to the rigid tube located at the second end of the connecting tube, and the end with the smaller opening is connected to the rigid tube located at the first end of the connecting tube.

[0027] According to the cable grounding box of the present invention, the diameter of the rigid tube is equal to the diameter of the opening, and the diameter of the end of the flexible tube with the larger opening is equal to the diameter of the rigid tube.

[0028] The rigid tube is provided with a connecting platform extending away from the axis of the rigid tube at the connection end with the opening, and a third sealing gasket is provided on the side of the connecting platform that contacts the opening.

[0029] The cable grounding box provided by this invention features a cylindrical box body with openings around its side walls for the passage of each phase grounding cable. A busbar copper component is positioned at the center of the bottom surface of the box to connect each phase grounding cable to the main grounding cable. This design results in a rounded, edgeless box, preventing injury to installation or maintenance personnel. Furthermore, the use of a busbar copper component, much smaller than the transposition busbar, to ground each phase grounding cable not only reduces costs but also minimizes the box's size. This makes the cable grounding box more suitable for applications with congested cable channels, providing more space for maintenance personnel during inspections. It also allows for multi-directional entry of each phase grounding cable, avoiding issues such as excessively small bending radii or the need to extend the grounding cable due to angle problems. Installation is convenient, and the length of the grounding cable is shortened. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the cable grounding box provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a direct grounding box in the prior art;

[0033] Figure 3 This is a schematic diagram of the structure of a protective grounding box in the prior art;

[0034] Figure 4 This is a schematic diagram of the cross-connect box in the prior art;

[0035] Figure 5 This is a schematic diagram of the structure of a protective grounding box provided in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of a cross-connection box provided in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of a direct grounding box provided in an embodiment of the present invention;

[0038] Figure 8 This is provided by the embodiments of the present invention. Figure 6 A magnified schematic diagram of part A in the middle section;

[0039] Figure 9 This is a schematic diagram of the connecting pipe provided in an embodiment of the present invention;

[0040] Figure label:

[0041] 1. Enclosure; 2. Busbar copper fitting; 3. Main grounding cable; 4. Grounding cable; 5. Opening; 6. Sheath voltage protector; 7. First connection terminal; 8. Second connection terminal; 9. First connection part; 10. Second connection part; 11. Through hole; 12. Groove; 13. Bolt; 14. Crimping cap; 15. Rigid tube; 16. Flexible tube. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] Currently, cable grounding boxes are generally rectangular, containing busbars or transposition copper busbars. Especially for cross-connection boxes, in addition to the busbars, three transposition copper busbars are required to cancel out the induced voltages between the three-phase cables. Therefore, existing rectangular cable grounding boxes are relatively expensive. Furthermore, due to the box shape and the arrangement of the internal busbars, cables must uniformly enter from the bottom of the box, which can easily lead to excessively small bending radii for the grounding cables or the need to extend the grounding cables, not only compromising installation but also further increasing operating costs.

[0044] Based on this, the present invention provides a cylindrical cable grounding box, thereby improving the ease of use of the cable grounding box and reducing its cost by changing its shape.

[0045] The following is combined Figures 1-9 The cable grounding box of the present invention is described.

[0046] In one embodiment, such as Figure 1 As shown, the cable grounding box includes: a box body 1 and a busbar copper component 2;

[0047] The housing 1 is cylindrical, and openings 5 ​​are provided around the side wall of the housing 1 for the passage of each phase grounding cable 4 and the main grounding cable 3;

[0048] The busbar copper component 2 is located at the center of the bottom surface inside the housing 1, and is connected to the grounding cable 4 of each phase and the main grounding cable 3 respectively.

[0049] In this embodiment, the conventional rectangular cable grounding box is replaced with a cylindrical shape, allowing the three-phase cable to enter the box from different directions. The connection to the main grounding cable can then be achieved through the busbar copper component located at the center of the bottom surface of the box. This avoids the use of busbar copper busbars, reducing the cost of the cable grounding box. It also avoids the need for a bottom-entry method, which can lead to an excessively small bending radius of the grounding cable or the need to extend the grounding cable due to angle issues. This simplifies installation and reduces operating costs.

[0050] In this embodiment, the use of a cylindrical enclosure eliminates sharp edges, preventing injury to installation or maintenance personnel. Furthermore, the reduced use of copper busbars allows for a smaller enclosure, making the cable grounding box more suitable for congested cable channels and providing more space for maintenance personnel during inspections.

[0051] Understandably, current cable grounding boxes typically use a bolted connection with a sealing ring to connect the cover to the box body, thus achieving dust and water resistance. However, to enhance waterproofing and dustproofing capabilities, dozens of bolts are often needed between the box body and the cover, making installation and disassembly cumbersome and increasing the cost of the cable grounding box. Furthermore, there is a risk that workers may neglect to properly secure the cover bolts, leading to water ingress or moisture damage to the cable grounding box, potentially causing grounding system defects or even ultimately resulting in main insulation failure.

[0052] Based on this, in one embodiment of the present invention, an opening is provided on the upper surface of the box, a cover is provided on the opening, the cover is screwed to the box, and a first sealing gasket is provided between the cover and the box.

[0053] In this embodiment, since the cable grounding box is cylindrical, the cover and the box can be screwed together. By screwing the cover and the box together and setting a first sealing gasket between the cover and the box, not only is the sealing performance of the box improved, but the installation and disassembly of the cover are also facilitated.

[0054] Furthermore, cable grounding boxes are divided into three types: direct grounding boxes, protective grounding boxes, and cross-connection boxes. Unlike direct grounding boxes, protective grounding boxes and cross-connection boxes require the installation of sheath voltage protectors between the busbar and each phase grounding cable when connecting the grounding cables of each phase to the busbar.

[0055] Based on this, in one embodiment of the present invention, such as Figure 5 and Figure 6 As shown, when the cable grounding box is a protective grounding box or a cross-interconnection box, the cable grounding box also includes: 3 sheath voltage protectors 6;

[0056] The three sheath voltage protectors 6 are respectively connected between the bus copper component 2 and the grounding cable 4 of each phase.

[0057] In this embodiment, as Figure 5 The protective grounding box shown, and as Figure 6 In the cross-connection box shown, by installing sheath voltage protectors between the bus copper component and each phase grounding cable, the protective grounding box and cross-connection box provided in this embodiment of the invention can respectively achieve interconnection with... Figure 3 The existing protective grounding box shown, and as... Figure 4The existing cross-connection box shown has the same function, but it effectively reduces the use of copper components compared to existing protective grounding boxes and cross-connection boxes, and facilitates the wiring of each phase grounding cable.

[0058] In one embodiment, such as Figures 5 to 7 As shown, the busbar copper component 2 is provided with three first connection terminals 7 and one second connection terminal 8;

[0059] The three first connection terminals 7 are distributed at 120° intervals with the center of the three terminals as the center, and each first connection terminal 7 is provided with a first connection part 9 for connecting the core of the grounding cable 4 of each phase or the sheath voltage protector 6.

[0060] After the conductor of each phase of the grounding cable 4 is connected to the second connection part 10, it is connected to the corresponding sheath voltage protector 6 or the first connection part 9 through the second connection part 10.

[0061] In this embodiment, by setting three first connection terminals distributed at 120° intervals with the centers of the three terminals on the bus copper component, and one second connection terminal, the connection between the bus copper component and the grounding cables of each phase and the main wiring cable is facilitated.

[0062] In this embodiment, the first connecting part can be a copper post or copper busbar arranged perpendicular to the bottom surface of the box, and the second connecting part can be a wire lug. By fixing the core of the grounding cable inside the wire lug, and then connecting the wire lug to the corresponding copper post or copper busbar when the cable grounding box is a direct grounding box, reliable grounding of each phase grounding cable can be achieved. When the cable grounding box is a protective grounding box or a cross-interconnection box, connecting the copper post or copper busbar to one end of the sheath voltage protector and the wire lug to the other end of the sheath voltage protector can achieve connection between each phase grounding cable and the sheath voltage protector.

[0063] Understandably, the lugs are usually connected to the copper posts, copper busbars, or sheath voltage protectors through through-holes on the lugs. Therefore, by adjusting the direction of each lug, the angle between the three-phase grounding cables can be adjusted. After tightening the bolts used to fix the lugs, the direction between the three-phase grounding cables is fixed. This allows for free adjustment of the connection angle according to the different incoming directions of each phase grounding cable, thereby further improving the convenience of installation and avoiding cable bending or extending the cable length due to angle issues.

[0064] In one specific embodiment, the busbar copper component may consist of an equilateral triangle structure fixed at the center of the inner bottom surface of the housing, or a structure of any shape but with three ends arranged at 120° intervals, and copper pillars, copper busbars, or grooves arranged at each corner of the triangle structure to achieve a 120° interval between the three connection ends. Then, by connecting the sheath voltage protector or wire lug to the copper pillars, copper busbars, or grooves, reliable grounding of the grounding cable is achieved.

[0065] In one specific embodiment, the busbar can also consist of a cylindrical structure fixed at the center of the inner bottom surface of the housing, copper pillars arranged at 120° intervals around the outer edge of the cylindrical structure, and copper busbars connecting each copper pillar to the cylindrical structure.

[0066] In one embodiment, such as Figure 6 As shown, when the cable grounding box is the cross-connection box, the bus copper component is connected to the bottom surface of the box body in a rotatable manner relative to the center position;

[0067] The first connecting part 9 is configured as a columnar connecting rod;

[0068] like Figure 8 As shown, the bottom end of the connecting rod is connected to the sheath voltage protector 6, and the top end extends upward in a direction perpendicular to the bottom surface of the housing 1; a through hole 11 is provided on the side wall of the connecting rod; a groove 12 extending towards another connecting rod is provided at the top end of the connecting rod.

[0069] By inserting the second connecting portion 10 of the conductor at the end of the grounding cable 4 into the corresponding through hole 11 and connecting the side wall of the connecting rod, and after accommodating the shielding layer of the grounding cable 4 in the groove 12 with the same orientation as the through hole 11 into which the grounding cable 4 is inserted, the crimping cap 14 and the connecting rod above the groove 12 are connected by bolts 13, thereby achieving the connection between the conductor of any phase of the grounding cable 4 and the shielding layer of the adjacent phase of the grounding cable 4 and the sheath voltage protector 6.

[0070] In this embodiment, on the one hand, by setting the cable grounding box body to a cylindrical shape and connecting the busbar copper component to the bottom surface of the box in a rotatable manner relative to the center position, the direction in which each phase grounding cable enters the box can be flexibly selected, further facilitating installation. On the other hand, by setting the first connecting part of the busbar copper component as a columnar connecting rod, and connecting the sheath voltage protector to the bottom end of the connecting rod, and extending upwards along a direction perpendicular to the bottom surface of the box at the top end, a through hole is opened on the side wall of the connecting rod, and a groove is opened at the top end of the connecting rod extending towards another connecting rod, and a crimp cap for connecting the connecting column by bolts is disposed on the groove, so that it can be connected as follows: Figure 6 As shown, after the conductor of the grounding cable is connected to the second connecting part (e.g., a lug, or other component that can fix the conductor for easy connection), the second connecting part is inserted into a through hole, and then fixed to the connecting post through the through hole by bolts, etc. The shield of the grounding cable is fixedly housed in a groove with the same orientation as the through hole into which the grounding cable is inserted by connecting the crimp cap to the connecting rod. This achieves the connection of the conductor of any phase grounding cable and the shield and sheath voltage protector of the adjacent phase grounding cable. This not only avoids the use of cross-connection copper busbars, but also reduces the number of bolt connections, avoids overheating caused by excessive contact resistance due to connection problems, and greatly reduces the cost of the cross-connection box and the installation difficulty.

[0071] In this embodiment, it can be understood that the depth of the groove is less than the diameter of the grounding cable shielding layer, and then the crimping cover preferably has an upward protrusion in the direction of the groove, and the curvature is less than the curvature of the shielding layer, so that when the connecting post is connected downward through the crimping cover, the shielding layer and the connecting post are in close contact.

[0072] In one embodiment, the openings include a plurality of openings evenly arranged at a preset distance on the side wall of the housing; each opening is provided with a cover plate;

[0073] A plurality of connectors are provided around the outer edge of the cover plate for connecting the cover plate to the opening.

[0074] In this embodiment, by arranging multiple openings evenly at a preset distance on the side wall of the box, and then setting a cover plate on each opening, the appropriate opening can be selected for the grounding cable to enter according to the direction of the grounding cable of each phase when the cable grounding box is actually used, thereby improving the convenience of the cable grounding box installation.

[0075] In this embodiment, multiple connectors are provided around the outer edge of the cover plate to connect the cover plate to the opening, ensuring an effective connection between the cover plate and the opening, thereby improving the sealing performance of the box.

[0076] Specifically, the connectors can be configured in various forms as needed. For example, the weld point can be used as the connector, that is, the cover plate can be connected to the opening by spot welding. Then, for the opening that needs to be used for the incoming line, the cover plate can be knocked off the opening. Alternatively, the cover plate can be connected to the opening by a snap fastener. Then, for the opening that needs to be used for the incoming line, the cover plate can be opened by the snap fastener. This will not be elaborated here.

[0077] In one embodiment, a second sealing gasket is provided between the cover plate and the opening.

[0078] In this embodiment, by providing a second sealing gasket between the cover plate and the opening, the sealing performance of the connection between the cover plate and the opening can be improved, thereby preventing water from entering or getting damp in the cable grounding box during use.

[0079] In one embodiment, the distance between two adjacent openings is greater than a preset insulation distance, which is the minimum insulation distance between the exposed cores at the ends of each phase of the grounding cable.

[0080] It should be noted that, in order to ensure the safe use of the cable grounding box, the distance between each phase grounding cable must be greater than the minimum insulation distance between the exposed cores at the ends of each phase grounding cable.

[0081] Therefore, in this embodiment, by setting the distance between two adjacent openings on the box to be greater than the minimum insulation distance between the exposed cores at the ends of each phase grounding cable, the safety of the cable grounding box can be effectively guaranteed.

[0082] In one embodiment, such as Figure 9 As shown, the cable grounding box further includes: a connecting pipe;

[0083] The connecting pipe is a combined pipe fitting consisting of a rigid pipe 15 and a flexible pipe 16; wherein, the diameter of the rigid pipe 15 is fixed, the flexible pipe 16 is elastic so that the diameter can be changed, and the flexible pipe 16 is disposed between the two sections of the rigid pipe 15.

[0084] The rigid tube 15 located at the first end of the connecting tube is detachably connected to the opening where the cover plate has been removed;

[0085] The soft tube 16 is a tapered tube with an opening that gradually increases from the first end to the second end. The end of the soft tube 16 with the larger opening is connected to the rigid tube 15 located at the second end of the connecting tube, and the end with the smaller opening is connected to the rigid tube 15 located at the first end of the connecting tube.

[0086] It is understandable that the openings after removing the cover plate are for the entry of each phase grounding cable. When the cable grounding box is used for grounding cables of different diameters, because the thickness of the grounding cables is different and they are not necessarily bottom entry, it is necessary to ensure the waterproof and moisture-proof properties of the junction box after connecting each phase grounding cable.

[0087] Based on this, in this embodiment, by first connecting a connecting pipe composed of a rigid pipe and a flexible pipe to the opening after removing the cover plate, and using a flexible pipe with a variable diameter in the middle of the connecting pipe, the rigid pipe can pass smoothly when connecting grounding cables of different thicknesses to the cable grounding box. At the flexible pipe, by expanding the diameter of the flexible pipe, the flexible pipe is made to make close contact with the outer wall of the grounding cable, thereby preventing water from entering the box or getting damp, and further improving the safety of the cable grounding box.

[0088] In this embodiment, by setting the flexible tube as a tapered tube with the opening gradually increasing from the first end to the second end, and connecting the larger opening end of the flexible tube to the rigid tube located at the second end of the connecting tube, and the smaller opening end to the rigid tube located at the first end of the connecting tube, the grounding cable with a larger wire diameter can also smoothly enter the flexible tube and then gradually fit into the inner wall of the flexible tube, thereby improving the convenience of cable grounding box installation.

[0089] Specifically, the diameter of the rigid pipe is preferably set to be compatible with the thickness of the largest grounding cable that can be used in the cable grounding box, while the diameter of the smaller opening end of the flexible pipe is preferably set to be slightly smaller than the thickness of the smallest grounding cable that can be used in the cable grounding box, thereby improving the applicability of the cable grounding box and ensuring its waterproof and moisture-proof properties during use.

[0090] In one specific embodiment, the rigid tube can be made of metal materials such as steel or iron, while the flexible tube can be made of elastic and deformation-resistant materials such as silicone.

[0091] In one embodiment, the diameter of the rigid tube is equal to the diameter of the opening, and the diameter of the end of the flexible tube with the larger opening is equal to the diameter of the rigid tube.

[0092] The rigid tube is provided with a connecting platform extending away from the axis of the rigid tube at the connection end with the opening, and a second sealing gasket is provided on the side of the connecting platform that contacts the opening.

[0093] In this embodiment, by setting the diameter of the rigid tube to be equal to the diameter of the opening, and the diameter of the end of the flexible tube with the larger opening to be equal to the diameter of the rigid tube, the tightness of the connection between the rigid tube and the opening, as well as the convenience of connecting the rigid tube and the flexible tube, are improved.

[0094] In this embodiment, a connecting platform extending away from the axis of the rigid pipe is provided at the connection end between the rigid pipe and the opening, and a second sealing gasket is provided on the side of the connecting platform that contacts the opening. At the same time, the connecting platform and the box body can be reinforced by bolts, thereby further improving the tightness of the connection between the rigid pipe and the opening, that is, improving the sealing performance of the cable grounding box, thereby preventing water or moisture from entering the cable grounding box, which could lead to defects in the grounding system or even ultimately cause a main insulation failure.

[0095] In summary, the cable grounding box provided by the embodiments of the present invention, on the one hand, has no sharp edges due to its cylindrical shape design, which avoids injury to installation or maintenance personnel, and on the other hand, eliminates the need for busbars and interconnecting copper busbars, which greatly reduces the production cost of the cable grounding box and also reduces its size, thus making it more suitable for use in congested cable channels.

[0096] On the other hand, during use, the direction of the incoming grounding cable for each phase can be freely selected, thus avoiding problems such as excessively small bending radius of the grounding cable or the need to extend the grounding cable due to the limitation of the incoming angle, making installation more convenient. When using connecting pipes composed of rigid and flexible pipes to connect the incoming cables of each phase, the sealing performance of the enclosure can also be improved, thereby effectively avoiding grounding system defects or even main insulation failures caused by water ingress or moisture into the cable grounding box.

[0097] On the other hand, by setting the cover to be screwed into the box, the installation and removal of the cable grounding box is more convenient. It also avoids the problem that if workers are negligent or lazy and do not connect all the cover bolts in place, the cable grounding box will get wet or become damp, resulting in defects in the grounding system, or even ultimately causing the main insulation to fail.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cable grounding box, characterized in that, include: Enclosure and busbar copper components; The enclosure is cylindrical, and openings are provided around the side walls of the enclosure for the passage of each phase grounding cable and the main grounding cable; The busbar copper component is located at the center of the bottom surface of the box body and is connected to the grounding cable of each phase and the main grounding cable respectively; When the cable grounding box is a protective grounding box or a cross-interconnection box, the cable grounding box also includes: 3 sheath voltage protectors; The three sheath voltage protectors are respectively connected between the bus copper component and the grounding cable of each phase; The busbar copper component is provided with three first connection terminals and one second connection terminal; The three first connection terminals are distributed at 120° intervals with the center of the three terminals as the center, and each first connection terminal is provided with a first connection part for connecting the wire core of the grounding cable of each phase or the sheath voltage protector. After the conductor of each phase of the grounding cable is connected to the second connection part, it is connected to the corresponding sheath voltage protector or the first connection part through the second connection part; Wherein, when the cable grounding box is the cross-interconnection box, the bus copper component is connected to the bottom surface of the box body in a manner that is rotatable relative to the center position; The first connecting part is configured as a columnar connecting rod; The bottom end of the connecting rod is connected to the sheath voltage protector, and the top end extends upward in a direction perpendicular to the bottom surface of the housing; a through hole is provided on the side wall of the connecting rod; a groove is provided at the top end of the connecting rod extending towards another connecting rod. By inserting the second connecting portion of the conductor connected to the end of the grounding cable into the corresponding through hole, connecting the side wall of the connecting rod, and after accommodating the shielding layer of the grounding cable in the groove with the same orientation as the through hole into which the grounding cable is inserted, the crimp cap and the connecting rod above the groove are bolted together, thereby achieving the connection between the conductor of any phase of the grounding cable and the shielding layer of the adjacent phase of the grounding cable and the sheath voltage protector.

2. The cable grounding box according to claim 1, characterized in that, An opening is provided on the upper surface of the box, and a cover is provided on the opening. The cover is screwed to the box, and a first sealing gasket is provided between the cover and the box.

3. The cable grounding box according to claim 2, characterized in that, The openings include a plurality of openings evenly arranged at a preset distance on the side wall of the housing; each opening is provided with a cover plate; A plurality of connectors are provided around the outer edge of the cover plate for connecting the cover plate to the opening.

4. The cable grounding box according to claim 3, characterized in that, A second sealing gasket is provided between the cover plate and the opening.

5. The cable grounding box according to claim 3, characterized in that, The distance between two adjacent openings is greater than a preset insulation distance, which is the minimum insulation distance between the exposed cores at the ends of each phase of the grounding cable.

6. The cable grounding box according to claim 3, characterized in that, Also includes: Connecting pipe; The connecting pipe is a combined pipe fitting composed of a rigid pipe and a flexible pipe; wherein, the diameter of the rigid pipe is fixed, the flexible pipe is elastic so that the diameter can be changed, and the flexible pipe is disposed between two sections of the rigid pipe. The rigid tube located at the first end of the connecting tube is detachably connected to the opening where the cover plate has been removed; The soft tube is a tapered tube with an opening that gradually increases from the first end to the second end, and the end of the soft tube with a larger opening is connected to the rigid tube located at the second end of the connecting tube, while the end with a smaller opening is connected to the rigid tube located at the first end of the connecting tube.

7. The cable grounding box according to claim 6, characterized in that, The diameter of the rigid tube is equal to the diameter of the opening, and the diameter of the end of the flexible tube with the larger opening is equal to the diameter of the rigid tube. The rigid tube is provided with a connecting platform extending away from the axis of the rigid tube at the connection end with the opening, and a third sealing gasket is provided on the side of the connecting platform that contacts the opening.

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