Grounding checking device for photovoltaic branch cable

Abstract

The utility model discloses a grounding troubleshooting device for a photovoltaic branch cable, and mainly relates to the field of cable grounding. Comprising a grounding support, a grounding copper bar in contact with a cable is arranged on the grounding support, a plurality of connecting grooves are formed in the grounding copper bar, metal sheets are slidably connected in the connecting grooves in the transverse direction, a plurality of pressing sheets are arranged on the grounding copper bar, a plurality of insulating pipe sleeves are arranged on the grounding copper bar, insulating rods are arranged on the metal sheets, and the insulating rods are slidably connected in the insulating pipe sleeves. A compression spring is arranged between the insulating rod and the insulating pipe sleeve, an alarm is arranged on the insulating pipe sleeve, a movable contact is arranged on the insulating rod, a static contact is arranged on the insulating pipe sleeve, and both the movable contact and the static contact are electrically connected with the alarm. The beneficial effects of the utility model are that the device can solve the technical problem that the poor grounding of the cable sheath cannot be found in time, achieves the automatic monitoring of the grounding of the cable, automatically carries out the troubleshooting alarm once the poor grounding occurs, and greatly improves the safety of the grounding of the cable.

Description

Technical Field

[0001] This utility model relates to the field of cable grounding, specifically a grounding troubleshooting device for photovoltaic branch cables. Background Technology

[0002] The sheath of a cable includes a metallic armor layer. When current flows through it, induced current can easily be generated within the metallic armor layer. Therefore, the cable sheath generally needs to be grounded to improve the cable's lightning protection and interference prevention capabilities, and to protect equipment and personal safety. The existing grounding method directly exposes the cable's armor layer and fixes it to the grounding copper busbar. After long-term use or being dragged by external forces, even if the contact between the armor layer and the grounding copper busbar becomes loose, it cannot be detected in time. This leads to poor surface grounding of the cable, which can easily cause current to accumulate on the cable surface, thus posing a safety hazard to equipment and personnel. Utility Model Content

[0003] The purpose of this utility model is to provide a grounding inspection device for photovoltaic branch cables. It can solve the technical problem that it is impossible to detect poor grounding of cable sheath in a timely manner, realize automatic monitoring of cable grounding, and automatically conduct inspection and alarm once poor grounding occurs, which greatly improves the safety of cable grounding.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A grounding inspection device for photovoltaic branch cables includes a grounding bracket, a grounding copper busbar that contacts the cable, multiple connecting grooves on the grounding copper busbar, a metal plate slidably connected in each connecting groove, one side of the cable contacting the metal plate, multiple pressure plates on the grounding copper busbar for fixing the cable in the connecting grooves, multiple insulating sleeves on the grounding copper busbar, an insulating rod on the metal plate, the insulating rod penetrating the grounding copper busbar and slidably connected in the insulating sleeve, a compression spring between the insulating rod and the insulating sleeve, an alarm on the insulating sleeve, a moving contact on the insulating rod, and a stationary contact on the insulating sleeve, both the moving and stationary contacts being electrically connected to the alarm, and the circuit of the alarm being connected when the moving and stationary contacts are in contact.

[0006] Furthermore, the insulating sleeve has a sliding hole on its side wall, and the insulating rod has a slider. The slider passes through the sliding hole and is slidably connected to it. The moving contact is connected to the end of the slider located outside the insulating sleeve.

[0007] Furthermore, a fixing block is provided on the outside of the insulating sleeve, the fixing block is located between the grounding copper busbar and the slider, and the stationary contact is fixed on the fixing block.

[0008] Furthermore, the metal sheet is arc-shaped to match the shape of the connecting groove.

[0009] Furthermore, the pressure plate is Ω-shaped, with the middle part of the Ω-shape contacting one side of the cable, and the two sides of the Ω-shape connected to the grounding copper busbar.

[0010] Furthermore, fixing bolts are symmetrically provided on both sides of the connecting groove, and fixing holes are symmetrically provided on both sides of the pressure plate. Nuts for fixing the pressure plate are threaded onto the fixing bolts.

[0011] Furthermore, the pressing sheet is made of conductive metal.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The structure of this utility model has multiple connecting grooves on the grounding copper busbar. Metal plates are slidably connected in the connecting grooves. The cable is fixed in the connecting groove by the pressure plate. One side of the cable is in contact with the metal plate. When the cable is fixed in the connecting groove by the pressure plate, the metal plate is pressed against the side wall of the connecting groove after one side of the cable contacts the metal plate. Once the cable loosens, the metal plate loses its compression and separates from the side wall of the connecting groove. Thus, the cable grounding fixation status can be monitored in real time by detecting the position of the metal plate, which simplifies the operation steps of grounding status monitoring and improves the accuracy of grounding monitoring.

[0014] 2. Multiple insulating sleeves are installed on the grounding copper busbar. Insulating rods are mounted on metal sheets, and these rods slide through the grounding copper busbar and are connected to the insulating sleeves. A compression spring is installed between the insulating rods and the insulating sleeves. In this structure, when the cable is fixed in the connecting groove, the metal sheet is compressed, causing the insulating rods to slide towards the inside of the insulating sleeves, compressing the springs. This causes the moving contact on the insulating rod to separate from the stationary contact on the insulating sleeve, thus disconnecting the alarm circuit on the insulating sleeve and preventing the alarm from sounding. If the cable loosens and loses its compression on the metal sheet, the insulating rod slides in the opposite direction under the action of the compression spring, causing its moving contact to slide and contact the stationary contact on the insulating sleeve. This connects the circuit to the alarm, and the alarm sounds immediately. This allows operators to promptly check and confirm poorly grounded cables, enabling real-time monitoring of cable grounding conditions, improving the efficiency and convenience of troubleshooting cable grounding faults, and ensuring the safety of cable sheath grounding. Attached Figure Description

[0015] Appendix Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Appendix Figure 2 This is a front view of the present invention.

[0017] Appendix Figure 3 This is an appendix to this utility model. Figure 2 A cross-sectional view along the AA direction.

[0018] Appendix Figure 4 This is an appendix to this utility model. Figure 3 A cross-sectional view along the BB direction.

[0019] Appendix Figure 5 This is an appendix to this utility model. Figure 4 A magnified view of part C in the middle.

[0020] Appendix Figure 6 This is a circuit diagram of the alarm device of this utility model.

[0021] The labels shown in the attached diagram:

[0022] 1. Grounding bracket; 2. Cable; 3. Grounding copper busbar; 4. Connecting groove; 5. Metal sheet; 6. Pressure plate; 7. Insulating sleeve; 8. Insulating rod; 9. Compression spring; 10. Alarm; 11. Moving contact; 12. Stationary contact; 13. Sliding hole; 14. Sliding block; 15. Fixing block; 16. Fixing bolt; 17. Fixing hole; 18. Nut. Detailed Implementation

[0023] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0024] Reference Figure 1 and Figure 2This utility model describes a grounding inspection device for a photovoltaic branch cable 2. Because the photovoltaic branch cable 2 is exposed to the outside environment for extended periods, it is easily shaken or dragged by external forces such as wind. Therefore, the sheath grounding of the cable 2 is prone to loosening, making grounding monitoring essential to ensure the safety of equipment and personnel. The main structure includes a grounding bracket 1, which is pre-embedded and fixed to the ground to ensure a secure ground connection. The grounding bracket 1 is equipped with a grounding copper busbar 3 that contacts the cable 2. The grounding bracket 1 is made of conductive metal, and the grounding copper busbar... 3. The grounding copper busbar 3 is fixedly connected to the grounding bracket 1 to achieve accurate grounding. The grounding copper busbar 3 is used to contact and fix the sheaths of multiple cables 2, realizing the synchronous grounding operation of multiple cable 2 sheaths. The grounding copper busbar 3 is provided with multiple connecting grooves 4, which are recessed inward from the surface of the grounding copper busbar 3, so as to better adapt to the surface shape of the cable 2, increase the contact area with the cable 2, and further improve the contact grounding effect. A metal sheet 5 is slidably connected laterally in the connecting groove 4. The metal sheet 5 is made of conductive metal. One side of the cable 2 is in contact with the metal sheet 5, as shown in the figure. Figure 3 Specifically, after the outer insulation layer of the cable 2 sheath is removed, the metal armor layer is exposed and comes into contact with the metal sheet 5. The grounding copper busbar 3 is equipped with multiple pressure plates 6 for fixing the cable 2 within the connecting groove 4. These pressure plates 6 press and fix the armor layer of the cable 2 sheath into the connecting groove 4. At this time, the cable 2 contacts the metal sheet 5 and drives the metal sheet 5 to slide laterally, then adheres tightly to the side wall of the connecting groove 4. Once the cable 2 loosens, the metal sheet 5 will separate from the side wall of the connecting groove 4 after losing the pressure of the cable 2. This structure allows for timely feedback on the grounding status of the cable 2 by monitoring the position of the metal sheet 5, thereby reducing the difficulty of monitoring the grounding status of the cable 2 and improving grounding efficiency. To ensure efficiency and timeliness of troubleshooting, multiple insulating sleeves 7, typically made of plastic or other insulating materials, are fixed to the grounding copper busbar 3 by adhesive or bolts. Insulating rods 8, typically made of plastic or ceramic, are fixed to the metal sheet 5 by adhesive or bolts. The insulating rods 8 penetrate the grounding copper busbar 3 and slide within the insulating sleeves 7. When the cable 2 is fixed inside the connecting groove 4, it compresses the metal sheet 5, causing it to move laterally and slide towards the inside of the insulating sleeves 7. A compression spring 9 is provided between the insulating rod 8 and the insulating sleeve 7. The sliding of the insulating rod 8 compresses the spring 9. An alarm 10 is provided on the insulating sleeve 7. (Refer to...) Figure 6The structure of any existing sound and light alarm 10 can be used. A moving contact 11 is welded to the insulating rod 8, and a stationary contact 12 is welded to the insulating sleeve 7. Both the moving contact 11 and the stationary contact 12 are electrically connected to the alarm 10. It is unavoidable that the circuit containing the alarm 10 is equipped with a separate power supply or is directly connected to the mains power to provide power for alarm triggering. When the moving contact 11 and the stationary contact 12 contact, the circuit containing the alarm 10 is connected. After the cable 2 is fixed in the connecting groove 4, it drives the insulating rod 8 to move towards the inside of the insulating sleeve 7, causing the moving contact 11 on the insulating rod 8 to separate from the stationary contact 12 on the insulating sleeve 7. When the cable 2 becomes loose, the circuit of the alarm 10 is disconnected, and the alarm 10 does not sound. Once the cable 2 becomes loose, the metal plate 5 loses the compression of the cable 2, and the insulating rod 8 slides in the opposite direction inside the insulating sleeve 7 under the action of the compression spring 9. This causes the moving contact 11 to contact the stationary contact 12, and the circuit of the alarm 10 is connected. At this time, the alarm 10 sounds an audible and visual alarm, reminding relevant personnel to conduct a grounding check in time. An alarm 10 is set at each grounding position of the cable 2, so that the location of the poorly grounded cable 2 can be quickly checked and located. This makes the fault check of the grounding of the cable 2 sheath more efficient and accurate, ensuring the accuracy of the grounding of the cable 2 and ensuring the safety of equipment and personnel.

[0025] Preferably, the insulating sleeve 7 has a through sliding hole 13 on its side wall, and a slider 14 is fixed to the insulating rod 8 by adhesive or bolt. The slider 14 passes through the sliding hole 13 and is slidably connected to it. The moving contact 11 is welded to the end of the slider 14 located outside the insulating sleeve 7. This structure allows the insulating rod 8 to slide and drive the slider 14 and the moving contact 11 to slide, thereby contacting or separating from the stationary contact 12 on the outside of the insulating sleeve 7. This does not occupy the internal space of the insulating sleeve 7 and ensures the smoothness of the sliding movement of the insulating rod 8 relative to the insulating sleeve 7.

[0026] Preferred, refer to Figure 4 and Figure 5 The insulating sleeve 7 is fixed to the outside by adhesive or bolts with a fixing block 15. The fixing block 15 is located between the grounding copper busbar 3 and the slider 14. The stationary contact 12 is fixed to the fixing block 15 by welding. With this structure, when the insulating rod 8 slides towards the inside of the insulating sleeve 7, the moving contact 11 on the slider 14 can slide away from the stationary contact block. When the cable 2 is loose, the insulating rod 8 slides towards the grounding copper busbar 3 inside the insulating sleeve 7 under the action of the compression spring 9. The moving contact 11 on the slider 14 can slide towards the stationary contact 12 until it contacts it, making the cooperation between the moving contact 11 and the stationary contact 12 more efficient and accurate.

[0027] Preferably, the metal sheet 5 is an arc shape that conforms to the shape of the connecting groove 4. The arc shape allows for closer contact with the sheath of the cable 2 and the side wall of the connecting groove 4 on the grounding copper busbar 3, further increasing the contact area and ensuring the robustness of the grounding structure.

[0028] Preferably, the pressure plate 6 is Ω-shaped, with the middle part of the Ω-shaped contacting one side of the cable 2, and the two sides of the Ω-shaped connected to the grounding copper busbar 3. This structure allows the middle part of the Ω-shaped arc to fully contact the side of the cable 2 sheath, improving the firmness of the cable 2. The connection of both ends to the grounding copper busbar 3 makes the disassembly and assembly of the pressure plate 6 and the grounding copper busbar 3 simpler and faster.

[0029] Preferably, fixing bolts 16 are symmetrically welded and fixed on both sides of the connecting groove 4, and fixing holes 17 are symmetrically provided on both sides of the pressure plate 6. Nuts 18 for fixing the pressure plate 6 are threaded onto the fixing bolts 16. With this structure, when fixing the cable 2, it is only necessary to put the fixing holes 17 at both ends of the pressure plate 6 onto the fixing bolts 16, and then rotate the nuts 18 to press the pressure plate 6. The structure is simple and the fixing of the cable 2 is more convenient and efficient.

[0030] Preferably, the pressure plate 6 is made of conductive metal. This structure allows the pressure plate 6 to not only fix the cable 2, but also to contact the armor layer of the cable 2 sheath before contacting the grounding copper busbar 3, further increasing the contact area between the armor layer and the grounding copper busbar 3 and improving the accuracy and firmness of grounding.

[0031] Working Principle: This invention features a grounding copper busbar 3 with multiple connecting grooves 4. Metal sheets 5 are slidably connected laterally within these grooves 4. Cable 2 is fixed within the connecting grooves 4 using pressure plates 6. One side of the cable 2 contacts the metal sheet 5. When the cable 2 is fixed in the connecting groove 4 by the pressure plates 6, its contact with the metal sheet 5 presses the metal sheet 5 firmly against the side wall of the connecting groove 4. If the cable 2 loosens, the metal sheet 5 loses its pressure and separates from the side wall of the connecting groove 4. Real-time monitoring of the grounding status of the cable 2 can be achieved by detecting the position of the metal sheet 5, simplifying the grounding monitoring process and improving accuracy. Multiple insulating sleeves 7 are provided on the grounding copper busbar 3. Insulating rods 8 are provided on the metal sheets 5. The insulating rods 8 penetrate the grounding copper busbar 3 and are slidably connected within the insulating sleeves 7. A compression spring 9 is provided between the insulating rod 8 and the insulating sleeve 7. This structure allows for real-time monitoring of the cable 2's grounding fixation. During the process of fixing cable 2 in the connecting groove 4, the metal sheet 5 is squeezed and drives the insulating rod 8 to slide towards the inside of the insulating sleeve 7, compressing the compression spring 9. This causes the moving contact 11 on the insulating rod 8 to separate from the stationary contact 12 on the insulating sleeve 7, thus disconnecting the circuit of the alarm 10 on the insulating sleeve 7. The alarm 10 will not sound an alarm. Once the cable 2 loosens and loses the compression of the metal sheet 5, the insulating rod 8 slides in the opposite direction under the action of the compression spring 9, causing the moving contact 11 on it to slide and contact the stationary contact 12 on the insulating sleeve 7. This connects the circuit of the alarm 10, and the alarm 10 immediately sounds an alarm. This allows operators to promptly check and confirm the poorly grounded cable 2, thereby realizing real-time monitoring of the grounding status of the cable 2, improving the efficiency and convenience of troubleshooting grounding faults in the cable 2, and ensuring the safety of the cable 2 sheath grounding.

Claims

1. A grounding inspection device for photovoltaic branch cables, comprising a grounding bracket (1), wherein the grounding bracket (1) is provided with a grounding copper busbar (3) in contact with the cable (2), characterized in that: The grounding copper busbar (3) is provided with multiple connecting grooves (4), and a metal sheet (5) is slidably connected in the connecting grooves (4) along the transverse direction. One side of the cable (2) is in contact with the metal sheet (5). The grounding copper busbar (3) is provided with multiple pressure plates (6) for fixing the cable (2) in the connecting grooves (4). The grounding copper busbar (3) is provided with multiple insulating sleeves (7). An insulating rod (8) is provided on the metal sheet (5). The insulating rod (8) slides through the grounding copper busbar (3). The insulating rod (8) is connected to the insulating sleeve (7). A compression spring (9) is provided between the insulating rod (8) and the insulating sleeve (7). An alarm (10) is provided on the insulating sleeve (7). A moving contact (11) is provided on the insulating rod (8). A stationary contact (12) is provided on the insulating sleeve (7). Both the moving contact (11) and the stationary contact (12) are electrically connected to the alarm (10). When the moving contact (11) and the stationary contact (12) are in contact, the circuit of the alarm (10) is connected.

2. The grounding troubleshooting device for photovoltaic branch cables according to claim 1, characterized in that: The insulating sleeve (7) has a sliding hole (13) on its side wall, and the insulating rod (8) has a slider (14). The slider (14) passes through the sliding hole (13) and is slidably connected to it. The moving contact (11) is connected to the end of the slider (14) located outside the insulating sleeve (7).

3. The grounding troubleshooting device for photovoltaic branch cables according to claim 2, characterized in that: The insulating sleeve (7) is provided with a fixing block (15) on its outside. The fixing block (15) is located between the grounding copper busbar (3) and the slider (14). The stationary contact (12) is fixed on the fixing block (15).

4. The grounding troubleshooting device for photovoltaic branch cables according to claim 1, characterized in that: The metal sheet (5) is arc-shaped to match the shape of the connecting groove (4).

5. The grounding troubleshooting device for photovoltaic branch cables according to claim 1, characterized in that: The pressure plate (6) is Ω-shaped, with the middle part of the Ω-shaped plate in contact with one side of the cable (2), and the two sides of the Ω-shaped plate connected to the grounding copper busbar (3).

6. The grounding detection device for photovoltaic branch cables according to claim 5, characterized in that: The connecting groove (4) is provided with fixing bolts (16) symmetrically on both sides, and the pressure plate (6) is provided with fixing holes (17) symmetrically on both sides. The fixing bolts (16) are threaded with nuts (18) for fixing the pressure plate (6).

7. The grounding detection device for photovoltaic branch cables according to claim 5, characterized in that: The pressing sheet (6) is made of conductive metal.

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