A ground box for a high voltage cable

Abstract

The application relates to the technical field of power equipment, and particularly discloses a grounding box of a high-voltage cable, which comprises a box body, a plurality of grounding copper bars arranged in the box body, a conductor connecting mechanism arranged on the grounding copper bars and connected with a cable introduced from outside the box. The conductor connecting mechanism is composed of a fixed part, a rotating part, a plurality of spiral conductive wires and a driving mechanism. The fixed part is fixed to the grounding copper bar and is provided with a cable conductor through hole; the rotating part is rotatable and slidable along the cable installation direction; the conductive wires are connected between the fixed part and the rotating part; and the driving mechanism drives the rotating part to rotate to realize the binding or loosening of the conductive wires to the cable conductor. Through the dynamic binding structure of the spiral conductive wires, the application realizes the stable electrical connection of the cable conductor and the grounding copper bar, has the heat displacement compensation capacity, effectively solves the problems of the loose connection of the traditional grounding box, the unstable conductive performance and the narrow adaptation range, and is convenient to install.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more specifically to a grounding box for a high-voltage cable. Background Technology

[0002] With the rapid development of the power industry, high-voltage cables are widely used in power transmission systems due to their advantages such as small footprint, high operational reliability, and minimal environmental impact. During operation, the metallic sheath of high-voltage cables can generate induced voltage due to electromagnetic induction. If proper grounding is not implemented, excessively high induced voltage can damage the sheath insulation and even lead to personal injury accidents. Therefore, the grounding box, as a key component of high-voltage cable lines, primarily functions to safely divert the induced current or short-circuit fault current from the cable's metallic sheath into the grounding grid, ensuring the safe and stable operation of the cable line.

[0003] Chinese patent document CN120127584B discloses a high-voltage cable grounding box, including a box body and a wiring assembly for connecting to the high-voltage cable. The wiring assembly is located inside the box body. The wiring assembly includes a busbar and several rectangular connectors arranged horizontally on the busbar. It also includes a heat dissipation assembly, which includes a heat sink, a driver, and a radiator. The driver and radiator are located outside the box body. The heat sink is detachably mounted on the busbar and has several mating grooves that mate with the connectors. The heat sink has a flow channel for coolant to flow through it. The heat sink, driver, and radiator are sequentially connected in a cyclical manner. This technical solution achieves heat dissipation by using a heat dissipation assembly, which includes a heat sink, driver, and radiator. The driver drives the coolant in the heat dissipation assembly to circulate between the radiator, driver, and heat sink, thereby achieving good heat dissipation without damaging the box body's sealing structure.

[0004] Furthermore, in certain special environments, such as underground cable trenches, humid areas, or chemical industrial parks, grounding boxes also face the risk of corrosion from moisture, dust, and corrosive gases. Traditional grounding boxes often use a single sealing ring, which has limited sealing performance. After long-term use, the sealing ring is prone to aging and failure, allowing moisture and dust to enter the box, causing corrosion of internal metal components and reducing the insulation performance and service life of the grounding box. At the same time, the box body of traditional grounding boxes is mostly made of ordinary steel, and even after anti-corrosion treatment, it is still difficult to resist the corrosion of highly corrosive environments, further limiting its application range.

[0005] To address the aforementioned problems, those skilled in the art have made a series of improvements. For example, Chinese patent application CN118783346A discloses a high-voltage cable grounding device with an adjustable grounding method that does not require opening. This device includes a housing, a cover, bolts, an A-phase assembly, a B-phase assembly, a C-phase assembly, a grounding terminal, a support frame, a grounding wire connection plate, an insulating support plate, and sheath protectors. The insulating support plate is fixedly connected to the housing. Each set of sheath protectors is positioned on the upper end of the insulating support plate. The support frame is fixedly connected to the insulating support plate. The grounding terminal is fixedly connected to the housing. The A-phase, B-phase, and C-phase assemblies penetrate the housing and are fixedly connected to the grounding wire connection plate. The cover is fixedly connected to one side of the housing using multiple sets of bolts. This allows for the inspection of the cable's metallic protective layer and sheath protectors without opening the grounding box, thereby ensuring the safety of maintenance personnel, improving cable inspection efficiency, and reducing the time required for on-site disassembly and assembly of the grounding box, thus increasing work efficiency.

[0006] Therefore, developing a high-voltage cable grounding box that is easy to install, has stable conductivity, a wide range of applications, can compensate for thermal displacement, and has excellent protective performance has become an urgent technical problem to be solved in the field of power equipment technology. Summary of the Invention

[0007] This invention provides a grounding box for high-voltage cables, aiming to solve the problems of inconvenient installation and unstable conductivity of high-voltage cable grounding boxes in related technologies.

[0008] A grounding box for a high-voltage cable includes a box body, wherein multiple grounding copper busbars are provided inside the box body, and conductor connection mechanisms are installed on the grounding copper busbars. The conductor connection mechanisms are connected to a cable introduced from outside the box, and the conductor connection mechanisms include:

[0009] The fixing part is fixedly installed on the grounding copper busbar, and the fixing part is provided with through holes for the cable conductor to pass through;

[0010] A rotating part that can rotate and slide along the cable installation direction is mounted on the grounding copper busbar of the enclosure;

[0011] Multiple conductive wires are spirally connected between the fixed part and the rotating part;

[0012] The drive mechanism, installed inside the housing, is used to drive the rotating part to rotate, thereby binding or releasing the cable conductor with the conductive wire.

[0013] Its effects are as follows: Driven by a drive mechanism, the rotating part rotates. When the rotating part rotates in the direction that tightens the conductive wire, the spiral conductive wire gradually wraps around and tightens around the outer circumference of the cable conductor passing through the through-hole. This close contact between the conductive wire and the cable conductor ensures a reliable electrical connection and stable conductivity. When the cable needs to be disassembled or replaced, the drive mechanism drives the rotating part to rotate in the opposite direction, releasing the conductive wire from the cable conductor. This makes cable installation and disassembly more convenient, eliminating the need for complex bolt tightening or welding operations and effectively improving installation efficiency. Simultaneously, the rotating part can slide along the cable installation direction, allowing the conductive wire to adaptively adjust according to the actual position of the cable conductor when binding it. This avoids uneven force on the conductive wire or unreliable connections due to installation errors, further ensuring the stability and reliability of the connection.

[0014] Preferably, the rotating part consists of a rotating ring and a sliding seat. The rotating ring is rotatably mounted on the sliding seat, and the sliding seat is slidably mounted on the grounding copper busbar. This ensures that the rotating ring can rotate smoothly under the action of the driving mechanism, while the sliding of the sliding seat does not interfere with the rotation of the rotating ring. This satisfies the rotational movement requirements when the conductive wire is tightened / untightened, and also provides adjustment margin along the cable axis for the conductive wire through the sliding of the sliding seat. This allows the axial stress on the cable conductor during installation and operation to be released, reducing the risk of mechanical fatigue at the connection points.

[0015] Preferably, the driving mechanism includes a worm gear rotatably connected to the sliding seat. The rotating ring is provided with driving teeth that mesh with the worm gear. Multiple worm gears are connected in series via a driving rod. One end of the driving rod is connected to a driving source. The driving source drives the driving rod to rotate, synchronously driving multiple worm gears to rotate. Furthermore, the meshing action of the driving teeth with the worm gear causes multiple rotating rings to rotate simultaneously, achieving synchronous operation of multiple conductor connection mechanisms. This greatly simplifies the process of simultaneously installing or removing multiple cables, improving operational convenience and consistency. The driving source can be a motor or a manual crank. When a motor is used, automated control can be achieved, reducing manual operation intensity. When a manual crank is used, it is suitable for scenarios without power supply or with special requirements for installation accuracy, enhancing the applicability of the device.

[0016] Preferably, the worm gear and the drive rod are insulated from each other, which effectively prevents the formation of conductive paths between the grounding copper busbars through the drive rod and the worm gear, prevents short circuits or interference between cables of different phases, ensures that each phase grounding circuit is independent, and improves the operational safety and reliability of the grounding box. Specifically, the insulated connection can be achieved by setting an insulating sleeve or insulating gasket at the connection between the worm gear and the drive rod. The insulating material can be epoxy resin or polytetrafluoroethylene, which have good insulation properties and mechanical strength.

[0017] Preferably, the rotating ring is composed of an inner ring and an outer ring coaxially rotatably connected. The inner ring is connected to the conductive wire, and an elastic element is installed between the inner and outer rings. When the rotating part rotates and tightens the conductive wire, the outer ring rotates under the drive of the driving mechanism, driving the inner ring to rotate synchronously through the elastic element, thereby causing the conductive wire to wrap around and bind the cable conductor. When the cable conductor undergoes axial displacement due to thermal expansion and contraction or external vibration, the inner ring can rotate at a certain angle relative to the outer ring. At this time, the elastic element undergoes elastic deformation, using the elastic force of the elastic element to compensate for the length change of the conductive wire caused by cable displacement, avoiding excessive stretching or slack of the conductive wire, ensuring that the conductive wire always maintains close contact with the cable conductor, and maintaining stable conductivity. The elastic element can be a torsion spring, with one end fixed to the inner ring and the other end fixed to the outer ring. When relative rotation occurs between the inner and outer rings, the torsion spring stores or releases elastic potential energy, thereby achieving buffering and compensation functions.

[0018] Preferably, a pre-tightening assembly is installed between the inner ring and the sliding seat. When the cable conductor enters the inner hole of the inner ring, the inner ring rotates, causing the conductive wire to initially bind to the cable conductor. This allows the conductive wire and the cable conductor to form a preliminary fit and fixation before the drive mechanism officially tightens the conductive wire. This prevents the already inserted cable conductor from shifting or shaking when other cable conductors are inserted, ensuring the accuracy and reliability of the subsequent conductive wire tightening operation. The pre-tightening assembly is automatically triggered after the cable conductor is inserted into the inner hole of the inner ring, requiring no additional manual operation and further simplifying the installation process.

[0019] Preferably, the pre-tightening assembly includes a locking tongue elastically hinged to a sliding seat. A triangular block is installed on the inner ring near the locking tongue. When the rotating ring rotates to completely spread the conductive wire, the inclined surface of the triangular block contacts the locking tongue, causing the locking tongue to move. Eventually, the locking tongue passes over the triangular block, and then the outer ring rotates in the opposite direction. The triangular block stops rotating and abuts against the locking tongue, causing the elastic element to undergo elastic deformation. At this time, the elastic element is in an energy-storing state. When the cable conductor is inserted into the inner hole of the inner ring, it will push the inner ring to rotate against the elastic force of the elastic element. The triangular block rotates accordingly, and the locking tongue resets under its own elastic action and abuts against the other side of the triangular block. At this time, the rotation of the inner ring causes the conductive wire to initially wrap around the cable conductor, achieving pre-tightening.

[0020] Preferably, the conductive wire is an indented metal wire, the surface of which is formed with regular concave and convex patterns by pressing. When the conductive wire is wrapped around and bound to the cable conductor, the indentation structure can increase the friction between the conductive wire and the outer periphery of the cable conductor, preventing the conductive wire from sliding relative to each other due to vibration and other factors during long-term operation, thereby ensuring the stability of the contact pressure and further improving the reliability of the conductive connection.

[0021] Preferably, the conductive wires are connected together at their middle sections by an elastic ring. This elastic ring helps to gather and position multiple conductive wires during tightening or loosening, preventing them from becoming tangled or interfering with each other. When the conductive wires bind the cable conductor, the elastic ring contracts synchronously with the tightening of the conductive wires.

[0022] Preferably, the conductive wire is made of copper alloy. Copper alloy has excellent electrical conductivity and mechanical strength, and its conductivity is close to that of pure copper, which can ensure smooth current transmission in the grounding circuit, reduce contact resistance, and reduce power loss. At the same time, copper alloy has good corrosion resistance and oxidation resistance, which can effectively resist the erosion of moisture, dust and corrosive gases that may be present in the box, and extend the service life of the conductive wire.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0024] 1. Significantly improved ease of installation: The drive mechanism rotates the rotating part to automatically tighten and loosen the conductive wires, replacing traditional bolt fastening or welding methods. This eliminates the need for complex tools, allowing for quick and easy installation and removal of cables by a single person. In particular, multiple conductor connection mechanisms can be synchronously driven by the same drive source, enabling batch installation or replacement of multiple cables, significantly shortening construction time and reducing labor costs.

[0025] 2. Stable and reliable conductivity: When the spiral conductive wire is tightened, it can form multiple close contacts with the outer circumference of the cable conductor, increasing the conductive area and reducing contact resistance. At the same time, the elastic element between the inner and outer rings and the sliding design of the sliding seat can effectively compensate for the axial and radial displacement of the cable caused by thermal expansion and contraction, vibration, etc., avoiding excessive stretching, loosening, or poor contact of the conductive wire, ensuring that the grounding circuit always maintains a low impedance continuity state, and guaranteeing the smooth conduction of grounding current.

[0026] 3. High operational safety: The insulated connection design between the worm gear and the drive rod completely blocks the conductive path formed between different grounding copper busbars through the drive components, preventing the risk of short circuits between different phase cables and ensuring the independence of each phase grounding system. Furthermore, the inner and outer ring structures of the rotating ring, the setting of the pre-tightening components, and the selection of copper alloy conductive wire all improve the electrical insulation performance and mechanical stability of the device from a structural and material perspective, reducing the incidence of operational failures.

[0027] 4. Wide adaptability and strong environmental tolerance: The drive source can be flexibly selected from motors or manual cranks, suitable for various installation scenarios with or without power supply. The conductor connection mechanism inside the enclosure adopts a fully enclosed design, combined with the selection of corrosion-resistant materials (such as copper alloy conductive wires and possible anti-corrosion treatment of the enclosure), which can effectively resist the erosion of water vapor, dust and corrosive gases in harsh environments such as underground cable trenches, humid areas, and chemical industrial parks, extending the service life of the grounding box and broadening its application fields.

[0028] 5. Possesses certain automatic compensation and pre-tightening functions: The pre-tightening component can be automatically triggered after the cable conductor is inserted into the inner ring, so that the conductive wire initially binds the cable, laying the foundation for subsequent full tightening and improving installation accuracy. Meanwhile, the elastic element can continuously provide compensating force during cable operation, ensuring that the conductive wire always maintains appropriate tension, reducing connection loosening problems caused by long-term operation, and enhancing the device's maintenance convenience and long-term reliability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a top view of the present invention.

[0031] Figure 3 This is a top view of the drive mechanism in this invention.

[0032] Figure 4 This is a schematic diagram of the conductor connection mechanism in this invention.

[0033] Figure 5 This is a front view of the conductor connection mechanism in this invention.

[0034] Figure 6 This is a top view of the conductor connection mechanism in this invention.

[0035] Figure 7 This is a cross-sectional view of the rotating ring in this invention.

[0036] Figure label:

[0037] 1. Housing; 11. Grounding copper busbar; 12. Conductor connection mechanism; 121. Fixing part; 122. Rotating part; 1221. Rotating ring; 12211. Inner ring; 12212. Outer ring; 12213. Elastic element; 1222. Sliding seat; 123. Conductive wire; 1231. Elastic ring; 124. Drive mechanism; 1241. Worm gear; 1242. Drive gear; 1243. Drive rod; 1244. Drive source; 125. Pre-tightening assembly; 1251. Triangular block; 1252. Locking tongue; 13. Cable entry hole. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1-7 As shown, a grounding box for a high-voltage cable mainly consists of an external protection and support mechanism, an electrical busbar mechanism, and a conductor connection mechanism 12. The external protection and support mechanism primarily comprises a high-protection-level enclosure 1 and sealing components. Its function is to provide a sealed space for the internal precision components, protecting them from external moisture, dust, and chemical corrosion, ensuring long-term insulation stability in underground cable trenches or humid environments. The electrical busbar mechanism, with a high-purity grounding copper busbar 11 as its core, is responsible for carrying and rapidly conducting the induced current or short-circuit fault current from the cable's metallic sheath, safely introducing it into the grounding grid. The conductor connection mechanism 12 is the core technology of this invention. Through geometric changes, it achieves uniform circumferential compression connection of the cable conductor and dynamically compensates for thermal displacement during operation.

[0040] The enclosure 1 is molded from high-performance sheet molding compound, possessing excellent mechanical strength, resisting external impacts, and exhibiting superior arc resistance and anti-aging properties. The wall thickness of enclosure 1 is optimized according to voltage levels to ensure it will not burst in the event of an extreme internal short-circuit discharge. At the bottom of enclosure 1, cable entry holes 13 are provided, fitted with laminated sealing connectors made of ethylene propylene diene monomer (EPDM) rubber. These connectors are adaptable to high-voltage cables of different diameters, tightening the sealing ring through threaded rotation to ensure a tight fit around the cable's outer sheath. The internal support frame of enclosure 1 is made of corrosion-resistant stainless steel, suspending all electrical components and enhancing insulation performance while ensuring the internal core components remain dry even when water accumulates at the bottom of enclosure 1.

[0041] The electrical busbar mechanism, serving as the center for current collection and conduction, consists primarily of multiple sets of grounding copper busbars 11 mounted on the internal support frame of the enclosure 1. These busbars are made of T2 copper with a purity of no less than 99.95%, and their surfaces are treated with tin or silver plating to reduce the electrochemical corrosion rate of the contact surfaces. The cross-sectional area of ​​the copper busbars is selected based on the expected short-circuit current level of the system, ensuring that the temperature rise under high current impact does not exceed the material's physical threshold. The copper busbars are supported by high-insulation-strength epoxy resin insulators between themselves and the enclosure 1. The creepage distance and clearance of these insulators meet or exceed international standards for the corresponding voltage level, thus providing a stable and safe electrical base for the conductor connection mechanism 12.

[0042] The conductor connection mechanism 12 consists of a fixed part 121, a driving mechanism 124, a rotating part 122 capable of axial displacement compensation, and multiple conductive wires 123 arranged in a spiral shape. In the conductor connection mechanism 12, the fixed part 121 acts as a bridge between mechanical support and current transfer. The fixed part 121 is rigidly fastened to the grounding copper busbar 11 by high-strength bolts, and has a through hole inside. This through hole serves as a channel for the cable conductor. The material of the fixed part 121 is usually a high-conductivity alloy with a coefficient of thermal expansion similar to that of the copper busbar to reduce the impact of thermal stress on the connection part. The corresponding rotating part 122 is the component with the most complex kinematic logic in this invention. The rotating part 122 is composed of a sliding seat 1222 and a rotating ring 1221 mounted on it. The sliding seat 1222 is not fixed, but is mounted on the grounding copper busbar 11 in a way that allows it to slide along the cable axis via a dovetail groove or linear ball bearing guide mechanism. When the multiple spiral conductive wires 123 rotate from the loosened state to the bound state, their projected length in three-dimensional space will shrink as the helix angle increases. The axial sliding degree of freedom of the sliding seat 1222 can accurately release the axial stress caused by geometric deformation, avoiding the risk of permanent plastic deformation or even breakage due to excessive tension on the conductive wires 123.

[0043] As the element that directly performs electrical contact, the physical characteristics and arrangement of the conductive wires 123 directly determine the performance of the grounding box. In this embodiment, multiple conductive wires 123 (preferably 6 to 10) are evenly distributed at equal angular intervals between the fixed part 121 and the rotating ring 1221. These conductive wires 123 exhibit a spatial envelope shape of a single-leaf hyperboloid when not under stress. The conductive wires 123 are made of a chromium-zirconium-copper (CuCrZr) alloy that has undergone vacuum solution aging treatment. This material maintains excellent conductivity close to that of pure copper while possessing mechanical strength and elastic recovery force similar to spring steel. To increase the friction with the conductor surface, the surface of each conductive wire 123 is processed with dense indentations of specific geometric angles through a micron-level cold rolling process. When the rotating part 122 drives the multiple conductive wires 123 to tighten, the microscopic "cutting edges" generated by these indentations penetrate the surface of the aluminum or copper conductor, thereby increasing the friction between them.

[0044] To ensure the morphological stability of the conductive wires 123 during operation, an elastic ring 1231 is connected at the middle of multiple conductive wires 123. This elastic ring 1231 is made of silicone rubber material with semi-conductive properties. It not only assists the conductive wires 123 in expanding radially outward when the mechanism is released and prevents them from snagging the cable, but also acts as a voltage equalization shield during operation, improving the electric field distribution at the connection point and suppressing the generation of corona discharge.

[0045] The drive mechanism 124 provides the power source for the deformation of the entire system. It includes a worm gear 1241 rotatably connected to the sliding seat 1222, and a drive gear 1242 (i.e., a worm wheel, integrated on the outer circumference of the rotating ring 1221) meshing with it. The drive gear 1242 is located on the outer circumferential surface of the rotating ring 1221. The drive rod 1243 is coaxially inserted with all the worm gears 1241, and the connection is insulated. This allows maintenance personnel to generate a huge tangential force on the rotating ring 1221 simply by rotating the drive rod 1243, which is then converted into a strong radial binding force on the cable conductor. The drive rod 1243 is made of high-polymer epoxy pultruded rod, which has extremely high torsional strength and insulation class, ensuring complete electrical isolation between different phase drive transmission paths. The drive source 1244 can be flexibly configured according to actual working conditions. When AC or DC power is available at the installation site, a micro servo motor with a gearbox can be selected as the drive source 1244. The motor output shaft is connected to the drive rod 1243 through an insulating connecting sleeve. With the help of a position sensor and control module, the tension of the conductive wire 123 can be automatically monitored and precisely controlled to meet the needs of intelligent operation and maintenance. If there is no power supply at the site, a detachable manual crank can be used. It can be quickly connected to the interface at the end of the drive rod 1243 through a square tenon structure. The lever principle is used to achieve manual drive, which is labor-saving and convenient to operate and suitable for emergency installation or maintenance operations in environments without electricity.

[0046] The internal logic structure of the rotating ring 1221 is further refined; it consists of a coaxially nested inner ring 12211 and an outer ring 12212. This double-ring structure transmits torque through circumferentially distributed high-stiffness elastic elements 12213 (such as compression springs). When the drive mechanism 124 drives the outer ring 12212 to rotate, the outer ring 12212 drives the inner ring 12211 through the elastic element 12213, which in turn drives the conductive wire 123. The underlying logic of this "soft connection" design is to achieve constant torque compression. When the binding force of the conductive wire 123 on the cable conductor reaches a preset scientific threshold, the inner ring 12211 will generate a hysteretic displacement relative to the outer ring 12212, and the elastic element 12213 will be compressed. At this point, no matter how much torque the operator continues to apply, the pressure acting on the cable conductor will remain stable within a constant predetermined value range determined by the physical parameters of the elastic element 12213. This mechanism effectively prevents the risk of damage to the conductive wire 123 and the cable conductor due to excessive manual operation.

[0047] Since multiple cable conductors need to be secured, a pre-tightening assembly 125 is required to initially fix the inserted cable conductors. The pre-tightening assembly 125 consists of a locking tongue 1252 elastically hinged to a sliding seat 1222 and a triangular block 1251 mounted on the side wall of the inner ring 12211. The operation of this mechanism is as follows: In the initial installation state, when the rotating ring 1221 rotates to its limit position in the spreading direction, the inclined surface of the triangular block 1251 contacts and actuates the locking tongue 1252. The locking tongue 1252 deflects and resets, thus locking the initial zero point of the mechanism. When the tightening operation begins, the triangular block 1251 abuts against a specific geometric surface of the locking tongue 1252, providing an initial starting resistance to the inner ring 12211, allowing the conductive wire 123 to quickly enter the pre-tightened state. This feedback based on mechanical logic allows the operator to determine the working stage of the mechanism by sound (clicking sound), improving the predictability and accuracy of on-site construction.

[0048] Working principle: The manual crank drives the drive rod 1243 to rotate, which in turn drives the worm gear 1241 to rotate. The worm gear 1241 meshes with the drive teeth 1242 of the outer ring 12212, causing the outer ring 12212 to rotate, which in turn drives the inner ring 12211 to rotate, causing the conductive wire 123 to fully spread out. During this process, the triangular block 1251 on the inner ring 12211 pushes the locking tongue 1252 to rotate, compressing the return spring. When the locking tongue 1252 passes the apex of the triangular block 1251, it resets and locks under the action of the return spring. Then, the manual crank drives the outer ring 12212 to rotate in the opposite direction, and the vertical surface of the triangular block 1251 abuts against the locking tongue 1252, causing the return spring to undergo elastic deformation. After the cable conductor passes through the through hole of the fixing part 121 and the inner hole of the inner ring 12211, the cable conductor abuts against the locking tongue 1252, thereby causing the locking tongue 1252 to rotate and disengage from the triangular block 1251. The inner ring 12211 rotates rapidly under the action of the return spring, causing the conductive wire 123 to retract, thereby binding the cable conductor with the conductive wire 123 and providing pre-tightening force. This prevents the already installed cable conductor from spreading out when inserting other cable conductors.

[0049] After all the high-voltage cable conductors are inserted into the conductor connection mechanism 12, the rotating drive rod 1243 drives the worm gear 1241 to rotate. The worm gear 1241 drives the outer ring 12212 of the rotating ring 1221 to rotate through gear meshing. The outer ring 12212 drives the inner ring 12211 to move synchronously through the elastic element 12213. The multiple conductive wires 123 continue to twist in space, increasing the binding force on the cable conductors. During this process, the sliding seat 1222 slides smoothly along the grounding copper busbar 11, absorbing the length change caused by the twisting of the conductive wires 123. Since the conductive wires 123 are evenly arranged in a circle, the pressure they apply to the conductor is all-round and centrally symmetrical. This not only avoids the conductor from generating lateral bending stress, but also ensures that the current density distribution on the circumference of the conductor is extremely uniform. After the cable is put into operation, even if the conductor expands radially due to the heat generated by the large current, the conductive wire 123 can also elastically yield slightly, and absorb this expansion energy by compressing the elastic element 12213 in the rotating ring 1221, so as to keep the contact pressure always within the ideal range.

[0050] The installation and operation process of this embodiment is as follows:

[0051] Step 1, Installation Preparation: Fix the grounding box to the cable trench wall through the slotted holes of the fixing bracket and the anchor bolts, connect the grounding wire of the outer shell of box 1, and ensure that the grounding resistance meets the requirements.

[0052] Step 2, Cable introduction: Pass multiple high-voltage cables through the cable introduction holes 13 at the bottom of the enclosure 1, adjust the cable position so that the cable conductors are aligned with the through holes of the fixing part 121 and the inner hole of the inner ring 12211, so that the sealing ring tightly wraps the outer sheath of the cable to complete the sealing.

[0053] Step 3, Pre-tightening Operation: The drive rod 1243 is rotated by manually cranking the crank handle. The drive rod 1243 drives the worm gear 1241 to rotate. The worm gear 1241 meshes with the drive teeth 1242 of the outer ring 12212, causing the outer ring 12212 to rotate, which in turn drives the inner ring 12211 to rotate, completely dispersing the conductive wire 123. During this process, the triangular block 1251 on the inner ring 12211 pushes the locking tongue 1252 to rotate, compressing the return spring. When the locking tongue 1252 passes the apex of the triangular block 1251, it resets and locks under the action of the return spring. Afterwards, the outer ring 12212 is rotated in the opposite direction by manually cranking the crank handle. The vertical surface of the triangular block 1251 abuts against the locking tongue 1252, causing the return spring to elastically deform. After the cable conductor passes through the through hole of the fixing part 121 and the inner hole of the inner ring 12211, the cable conductor abuts against the locking tongue 1252, thereby causing the locking tongue 1252 to rotate and disengage from the triangular block 1251. The inner ring 12211 rotates rapidly under the action of the return spring, causing the conductive wire 123 to retract, thereby binding the cable conductor with the conductive wire 123 and providing pre-tightening force. This prevents the already installed cable conductor from spreading out when inserting other cable conductors.

[0054] Step 4, Tightening Operation: After all cable conductors are threaded through, continue to drive the outer ring 12212 to rotate by manually cranking the handle. The outer ring 12212 drives the inner ring 12211 to rotate through the return spring, causing the spiral conductive wire 123 to gradually contract and uniformly compress the cable conductor in a circumferential direction until the rotation angle of the rotating ring 1221 reaches the preset range.

[0055] Step 5, Operation Monitoring: When the high-voltage cable is running, the induced current is transmitted to the grounding copper busbar 11 through the cable conductor, conductive wire 123, and fixing part 121, and finally into the grounding grid. The temperature sensor monitors the temperature of the grounding copper busbar 11 in real time.

[0056] In specific installation and construction scenarios, the grounding box of this invention demonstrates significant efficiency advantages. Traditional bolt connections require construction workers to use torque wrenches for tedious, repeated tightening at multiple points, and it is difficult to ensure uniform force at each point in a narrow space. In contrast, this invention, through a single drive source 1244 driving the screw mechanism, achieves uniform circumferential binding of the conductor in a single operation. Its axial sliding compensation and torque adaptive functions significantly reduce the complexity of spare parts.

[0057] Furthermore, the grounding box in this embodiment also considers electric field optimization for ultra-high voltage systems. An equipotential bonding sphere can be optionally installed outside the conductor connection mechanism to reduce the local electric field strength by increasing the radius of curvature, preventing corona discharge that may occur in 220kV and above grounding systems from causing an increase in ambient ozone concentration and accelerating the aging of insulation components. The box 1 can also be equipped with an RFID-based asset management tag to record core data such as the installation date, number of operations, and cable specifications of the grounding box, providing a basic data interface for future digital operation and maintenance of the power grid.

[0058] In summary, the core of this embodiment lies in constructing an intelligent electrical interface with self-sensing, self-compensation, and self-locking capabilities. The sliding of the sliding seat 1222, the rotation of the rotating ring 1221, the differential speed compensation between the inner ring 12211 and the outer ring 12212, and the logical guidance between the triangular block 1251 and the locking tongue 1252—these mechanical collaborations together constitute a conductive docking mechanism that facilitates the disassembly and connection of cable conductors.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A grounding box for a high-voltage cable, comprising a box body (1), wherein a plurality of grounding copper busbars (11) are provided inside the box body (1), and conductor connection mechanisms (12) are installed on the grounding copper busbars (11), the conductor connection mechanisms (12) being connected to a cable introduced from outside the box, characterized in that, The conductor connection mechanism (12) includes: The fixing part (121) is fixedly installed on the grounding copper busbar (11), and the fixing part (121) is provided with a through hole for the cable conductor to pass through; A rotating part (122) is rotatably mounted on the grounding copper busbar (11) of the housing (1) and is slidable along the cable installation direction; the rotating part (122) includes a rotating ring (1221), which is composed of an inner ring (12211) and an outer ring (12212) coaxially rotatably connected, the inner ring (12211) is connected to the conductive wire (123), and an elastic element (12213) is installed between the inner ring (12211) and the outer ring (12212). Multiple conductive wires (123) are spirally connected between the fixed part (121) and the rotating part (122); The drive mechanism (124), installed inside the housing (1), is used to drive the rotating part (122) to rotate, thereby causing the conductive wire (123) to bind or loosen the cable conductor.

2. The grounding box for the high-voltage cable according to claim 1, characterized in that, The rotating part (122) also includes a sliding seat (1222), a rotating ring (1221) is rotatably mounted on the sliding seat (1222), and the sliding seat (1222) is slidably mounted on the grounding copper busbar (11).

3. The grounding box for the high-voltage cable according to claim 2, characterized in that, The drive mechanism (124) includes a worm (1241) rotatably connected to the sliding seat (1222). The rotating ring (1221) is provided with drive teeth (1242) that mesh with the worm (1241). Multiple worms (1241) are connected in series through a drive rod (1243). One end of the drive rod (1243) is connected to a drive source (1244).

4. The grounding box for the high-voltage cable according to claim 3, characterized in that, The worm gear (1241) and the drive rod (1243) are insulated from each other.

5. The grounding box for the high-voltage cable according to claim 4, characterized in that, A pre-tightening assembly (125) is installed between the inner ring (12211) and the sliding seat (1222). When the cable conductor enters the inner hole of the inner ring (12211), the inner ring (12211) rotates to initially bind the conductive wire (123) to the cable conductor.

6. The grounding box for a high-voltage cable according to claim 5, characterized in that, The pre-tightening assembly (125) includes a latch (1252) elastically hinged to a sliding seat (1222). A triangular block (1251) is installed on the side of the inner ring (12211) near the latch (1252). When the rotating ring (1221) rotates and the conductive wire (123) is completely spread out, the inclined surface of the triangular block (1251) contacts the latch (1252) and moves the latch (1252). Finally, the latch (1252) passes over the triangular block (1251). Then the outer ring (12212) rotates in the opposite direction, and the triangular block (1251) stops rotating by abutting against the latch (1252). The elastic element (12213) undergoes elastic deformation.

7. The grounding box for a high-voltage cable according to any one of claims 1-6, characterized in that, The conductive wire (123) is an indented metal wire.

8. The grounding box for the high-voltage cable according to claim 7, characterized in that, The conductive wire (123) is connected to an elastic ring (1231) in the middle.

9. The grounding box for a high-voltage cable according to claim 7, characterized in that, The conductive wire (123) is made of copper alloy.

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