A device for finding high resistance ground fault of cable by using cable capacitance characteristic

Abstract

The utility model relates to electrical field especially utilizes a kind of device for searching cable high-resistance grounding fault with cable capacitance characteristic, including protective sheath, insulating rod, the inside of protective sheath is inserted and connected with megohmmeter body, megohmmeter body's top is inserted with data line, and one end of data line is fixedly connected with wire clip, the inside of wire clip is provided with copper tooth, and the both sides of wire clip are fixedly connected with connecting plate, fastening assembly, fastening assembly is used to improve the clamping firmness of wire clip, and fastening assembly is connected with wire clip and connecting plate respectively. Its main purpose is to solve the problem of inconvenient detection of cable high-resistance grounding fault, and the following technical scheme is proposed: the utility model charges non-fault cable by 2500V megohmmeter body, after charging non-fault cable, discharge fault cable by insulating rod, and find fault point by artificial at the same time of discharging, so as to significantly reduce artificial cost and troubleshooting difficulty.

Description

Technical Field

[0001] This utility model relates to the electrical field, and in particular to a device for locating high-resistance grounding faults in cables by utilizing the capacitance characteristics of cables. Background Technology

[0002] As the core carrier of electrical energy transmission, the operational reliability of power cables directly affects the safety of the power grid. However, due to factors such as mechanical damage during cable laying, harsh construction site environments, and defects like sharp corners and poor quality during cable tray fabrication, grounding faults (such as high-resistance grounding) are unavoidable during cable laying. Traditional cable fault location methods rely on manual inspection, which is not only wasteful of manpower and resources but also often fruitless. Using testing equipment requires specialized technicians. In the absence of specialized equipment and technicians, mailing fault detection equipment or directly replacing cables not only incurs high economic costs but also delays the construction period due to the inability of testing equipment to reach the site quickly, severely impacting the construction progress.

[0003] This invention utilizes the capacitance characteristics of cables and the acoustic effect of high-voltage discharge to provide a low-cost, high-efficiency high-resistance grounding fault location solution, which is particularly suitable for emergency construction scenarios without professional equipment support. Utility Model Content

[0004] The purpose of this invention is to solve the problem of inconvenient detection of high-resistance grounding faults in cables.

[0005] The technical solution of this utility model: A device for locating high-resistance grounding faults in cables by utilizing the capacitance characteristics of cables, comprising a protective casing and an insulating rod. A megohmmeter body is inserted into the inner side of the protective casing, and a data cable is inserted into the top of the megohmmeter body. One end of the data cable is fixedly connected to a wire clamp, and the inner side of the wire clamp is provided with copper teeth. Connecting plates are fixedly connected to both sides of the wire clamp, and a fastening assembly is provided. The fastening assembly is used to improve the clamping firmness of the wire clamp. The fastening assembly is connected to the wire clamp and the connecting plate respectively, and the fastening assembly includes a connecting rod rotatably connected to the inner side of the wire clamp.

[0006] Optionally, the number of the connecting rods is set to two, and the two connecting rods are arranged in an axisymmetric manner.

[0007] Optionally, one end of each of the two connecting rods is rotatably connected to a hollow limiting frame, which is configured with a hollow rectangular outline.

[0008] Optionally, a support frame is rotatably connected to one side of the connecting plate, and the support frame is located on the outside of the clamp.

[0009] Optionally, the bottom of the support frame is threaded with a fastening stud, the bottom end of the fastening stud is fixedly connected with a rotating handle, and the top end of the fastening stud is fixedly connected with a rectangular limiting block.

[0010] Optionally, a connecting frame is rotatably connected to the top of the support frame.

[0011] Optionally, the number of connecting frames is set to two, and the two connecting frames are arranged in an axisymmetric manner.

[0012] Optionally, two elastic clips are fixedly connected to the top of each of the two connecting frames, and multiple elastic clips are distributed on both sides of the clamp.

[0013] Optionally, the elastic clip is configured with an arc-shaped profile.

[0014] Optionally, the elastic clip is an elastic structure.

[0015] In summary, this application includes at least one of the following beneficial technical effects: This utility model is specifically designed for work sites with limited equipment. It can significantly reduce labor costs, ensure construction quality, and greatly shorten the troubleshooting cycle. While ensuring the smooth commissioning of the project, it truly achieves the dual goals of cost reduction and efficiency improvement, providing a reliable guarantee for the project progress.

[0016] The connection between the clamp and the cable is further strengthened by fastening components to prevent the clamp from falling off due to a loose connection when charging with the cable, thus ensuring the normal use of the megohmmeter.

[0017] In summary, this utility model strengthens the connection between the clamp and the cable, allowing non-faulty cables to be charged using a 2500V megohmmeter. After the non-faulty cables are charged, the faulty cable is discharged using an insulating rod. Simultaneously, the fault point is manually located, thus significantly reducing labor costs and the difficulty of troubleshooting. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of a device for locating high-resistance grounding faults in cables by utilizing the capacitance characteristics of cables; Figure 2 This is a three-dimensional structural diagram of the fastening assembly; Figure 3 for Figure 2 Enlarged view of the A-section structure; Figure 4 A schematic diagram showing the connection between a device for locating high-resistance grounding faults in cables by utilizing their capacitance characteristics and the faulty cable.

[0019] Figure label: 1. Protective housing; 2. Megohmmeter; 3. Data cable; 4. Cable clamp; 5. Copper teeth; 6. Connecting plate; 7. Connecting rod; 8. Hollow limit bracket; 9. Support frame; 10. Fastening stud; 11. Rotary handle; 12. Connecting frame; 13. Elastic clamp; 14. Rectangular limit block; 15. Insulating rod. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0022] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1: As Figures 1-2As shown, a device for locating high-resistance grounding faults in cables using cable capacitance characteristics includes a protective housing 1 and an insulating rod 15. The insulating rod is a well-disclosed feature in the prior art and will not be explained further. The protective housing 1 is a 2500V megohmmeter. A megohmmeter body 2 is inserted into the inner side of the protective housing 1. A data cable 3 is inserted into the top of the megohmmeter body 2. One end of the data cable 3 is fixedly connected to a wire clamp 4. The inner side of the wire clamp 4 is provided with copper teeth 5. The copper teeth 5 are pointed teeth that can interlock and are made of copper. Connecting plates 6 and fastening components are fixedly connected to both sides of the wire clamp 4. The fastening components are used to improve the clamping firmness of the wire clamp 4 and are connected to the wire clamp 4 and the connecting plates 6 respectively.

[0026] In this embodiment, in emergency situations involving high-resistance grounding faults in cables, the lack of professional equipment and technical personnel means that traditional equipment cannot quickly arrive on-site, and replacing the entire cable is not only time-consuming and labor-intensive but also leads to serious project delays and huge downtime losses. This technical solution is specifically designed for work sites with limited equipment, and through innovative processes, it achieves: significantly reduced labor costs; ensured construction quality meets standards; and greatly shortened the fault handling cycle. While ensuring the smooth commissioning of the project, it truly achieves the dual goals of cost reduction and efficiency improvement, providing a reliable guarantee for the project schedule.

[0027] When a cable experiences a high-resistance grounding fault, professional testing equipment and technicians cannot arrive on-site quickly. However, by using a 2500V megohmmeter and taking advantage of the cable's capacitance characteristics, the fault point can be quickly located.

[0028] Use a 2500V megohmmeter to charge the non-faulty cables. After charging the non-faulty cables, use an insulating rod (15) to discharge the faulty cable. While discharging, send people to the cable tunnel to locate the fault point by listening for the discharge sound. The operating steps during the test are as follows: Ground the entire cable shielding layer to ensure reliable discharge to ground during discharge, avoiding failure to discharge due to poor grounding. Suspend the main cores of both ends of the cable to prevent grounding of the main cores, which would prevent charging of the cable. Assign a dedicated person to guard the other end and set up a warning line in the work area to prevent accidental contact. Short-circuit the main cores of the non-faulty cable and leave an appropriate lead wire to connect to the insulating rod 15 (for discharge). Then connect the non-faulty cable using clamp 4 and charge the non-faulty cable through the megohmmeter body 2. After the pointer of the insulating electronic meter stabilizes, remove the megohmmeter body 2. The operator uses the insulating rod 15 to place the lead wire on the main core of the faulty cable to discharge it. Before discharging, use communication equipment to notify personnel to listen for the discharge sound.

[0029] After the fault is located, the fault point of the cable is dealt with. After the cable fault is dealt with, a cable withstand voltage test is carried out. Power can only be supplied after the cable passes the withstand voltage test.

[0030] Through the above method, it can particularly meet the requirements of equipment-limited working sites, achieve effects including significantly reducing labor costs, ensuring construction quality meets standards, and greatly shortening the fault handling cycle; while ensuring the smooth commissioning of the project, it truly achieves the dual goals of cost reduction and efficiency increase, and provides reliable guarantee for the project progress.

[0031] Example 2: As Figures 2-3 shown, the fastening assembly includes connecting rods 7 rotatably connected to the inner side of the wire clamp 4, the number of the connecting rods 7 is set to two, the two connecting rods 7 are distributed axisymmetrically, both of the two connecting rods 7 are arranged on the inner side of the wire clamp 4, one end of each of the two connecting rods 7 is rotatably connected with a hollow limiting frame 8, the hollow limiting frame 8 is arranged with a hollow rectangular contour, one side of the connecting plate 6 is rotatably connected with a support frame 9, the support frame 9 is arranged in an inverted "冂" shape, the support frame 9 is arranged on the outer side of the wire clamp 4, the bottom of the support frame 9 is threadedly connected with a fastening stud 10, the bottom end of the fastening stud 10 is fixedly connected with a rotating handle 11, the top end of the fastening stud 10 is fixedly connected with a rectangular limiting block 14, the rectangular limiting block 14 is arranged with a rectangular contour, the top end of the support frame 9 is rotatably connected with connecting frames 12, the number of the connecting frames 12 is set to two, the two connecting frames 12 are distributed axisymmetrically, the top end of each of the two connecting frames 12 is fixedly connected with two elastic clamps 13, the plurality of elastic clamps 13 are distributed on both sides of the wire clamp 4, the elastic clamp 13 is arranged with an arc-shaped contour, and the elastic clamp 13 is an elastic structure.

[0032] In this embodiment, when connecting the megohmmeter body 2 to the cable, pressing the clamp 4 increases the opening of one end of the copper teeth 5, clamping the cable. The serrated design of the copper teeth 5 increases the firmness of the cable clamping. When encountering a large cable or a cable that is difficult to clamp, after clamping the cable with the clamp 4, rotating the handle 11 lowers the fastening stud 10. After the rectangular limiting block 14 contacts the hollow limiting frame 8, the rectangular limiting block 14 limits the hollow limiting frame 8. As the fastening stud 10 lowers, the rectangular limiting block 14 drives the hollow limiting frame 8 to lower, causing the connecting rods 7 on both sides to move outwards, thereby increasing the opening at the bottom of the clamp 4, allowing the copper teeth to be installed on the clamp 4. The opening at one end of clamp 5 is reduced, thereby contracting the opening at the top of clamp 4 and increasing the clamping strength on the cable. This improves the firmness of clamp 4 in clamping the cable and prevents clamp 4 from falling off due to insecure connection during charging. At the same time, when connecting to the cylindrical part of the cable, the connecting brackets 12 on both sides can be flipped to be close to the top of clamp 4. When clamp 4 is connected to the cylindrical part of the cable, elastic clip 13 can be sleeved on the cylindrical part. Since elastic clip 13 is an elastic structure and its overall outline is close to a circle, it can match the cylindrical part of the cable, thereby preventing the clamp 4 from falling off due to unstable connection at the cylindrical outline. This increases the stability of clamp 4 when connected to the cable.

[0033] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A device for locating high-resistance grounding faults in cables using cable capacitance characteristics, comprising a protective housing (1) and an insulating rod (15), characterized in that: The protective casing (1) has a megohmmeter body (2) inserted into its inner side. A data cable (3) is inserted into the top of the megohmmeter body (2). One end of the data cable (3) is fixedly connected to a wire clamp (4). Copper teeth (5) are provided on the inner side of the wire clamp (4). Connecting plates (6) are fixedly connected to both sides of the wire clamp (4). A fastening assembly is used to improve the clamping firmness of the wire clamp (4). The fastening assembly is connected to the wire clamp (4) and the connecting plate (6) respectively. The fastening assembly includes a connecting rod (7) rotatably connected to the inside of the wire clamp (4).

2. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 1, characterized in that, The number of the connecting rods (7) is set to two, and the two connecting rods (7) are arranged in an axisymmetric manner.

3. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 2, characterized in that, One end of each of the two connecting rods (7) is rotatably connected to a hollow limiting frame (8), which is arranged in a hollow rectangular shape.

4. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 1, characterized in that, A support frame (9) is rotatably connected to one side of the connecting plate (6), and the support frame (9) is located on the outside of the line clamp (4).

5. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 4, characterized in that, The bottom of the support frame (9) is threaded with a fastening stud (10), the bottom end of the fastening stud (10) is fixedly connected with a rotating handle (11), and the top end of the fastening stud (10) is fixedly connected with a rectangular limiting block (14).

6. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 4, characterized in that, The top of the support frame (9) is rotatably connected to the connecting frame (12).

7. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 6, characterized in that, The number of the connecting frame (12) is set to two, and the two connecting frames (12) are arranged in an axisymmetric manner.

8. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 6, characterized in that, Two elastic clips (13) are fixedly connected to the top of each of the two connecting frames (12), and multiple elastic clips (13) are distributed on both sides of the wire clamp (4).

9. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 8, characterized in that, The elastic clip (13) is configured with an arc-shaped profile.

10. The device for locating high-resistance grounding faults in cables using cable capacitance characteristics according to claim 8, characterized in that, The elastic clip (13) is an elastic structure.

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