Power cable insulation defect detection device

Abstract

The invention discloses a power cable insulation defect detection device, and relates to the technical field of cable detection, in particular to a power transmission cable local insulation defect detection device. The method specifically comprises the steps that a detection cable needs to penetrate through a fixing support to be detected, and the detection cable can be driven to move through clockwise rotation to complete detection. And a defect detection brush is arranged between the two fixed brackets and is in close contact with a detection cable. The fixing support fixes a detection cable through a pressing shell, the pressing shell is connected through two sets of pressing springs, and the pressing springs can stretch out and draw back so that the fixing support can fix and support cables of different diameter specifications. The inner circumference of the defect detection brush is filled with conductive metal brushes, all the conductive metal brushes are connected with conductive terminals, and the outer portions of the conductive terminals are connected through wires to enter a detection circuit. The conductive metal brushes are elastic, and when the detection cable passes through the defect detection brush, all the conductive metal brushes are in close contact with the detection cable. When the insulation layer on the surface of the detection cable has defects, the detection cable, the defect detection brush, the direct-current power supply and the universal meter form a closed conductive circuit, the universal meter can detect that current passes, and in this way, it is proved that the surface of the cable has defects. The conductive metal brush with elastic deformation is in contact with the cable, the conductive metal brush is annularly arranged and can cover the surface of the cable, if local insulation defects exist on the skin of the cable, the conductive metal brush conducts the to-be-detected cable, the current value is displayed through the universal meter, the method is simple and convenient, detection is rapid, and the detection efficiency is high. The problem of electric leakage caused by the cable with liquid when liquid conduction is adopted is solved.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, specifically to a device for detecting local insulation defects in power transmission cables. Background Technology

[0002] During long-term use, cables may develop localized insulation defects, such as broken cores, due to wear and tear from prolonged use, transportation, excessive bending, or accidental cutting. To ensure safety, it is essential to quickly identify and replace leaking cables promptly.

[0003] Patent CN215641754U discloses a cable leakage current detection device, including a leakage current detection platform, a high-voltage DC power supply, a power cord, and a detector. The DC power supply is connected in series with the leakage current detection platform and the detector via the power cord, which is also connected to the beginning of the cable. The leakage current detection platform has a curved channel through which the cable passes and moves forward. Leakage current is detected while the cable is being wound up. The cable passes through a conductive solution in the leakage current detection platform, which is connected to the high-voltage DC power supply. If the cable sheath is damaged or cracked, the cable will act as a conductor when the leakage point passes through the conductive solution, directly connecting the detection circuit, and the detector will immediately detect it. However, the cable will adhere to the conductive liquid as it passes through the liquid. As the test progresses, the conductive liquid will gradually deplete, requiring periodic replenishment. Furthermore, the conductive liquid adhering to the cable can cause leakage during winding, posing a safety hazard to the testing personnel. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing technology and provide a cable partial insulation defect detection device. By using a conductive needle with elastic deformation to contact the cable, the conductive needle is arranged in a ring to cover the cable surface. If there is a partial insulation defect in the cable sheath, the conductive needle conducts through the cable under test, and the tester displays the resistance value or current value. It is simple, convenient and quick to detect, and solves the problem of leakage caused by liquid in the cable when using liquid conduction. It can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A power cable insulation defect detection device, comprising:

[0007] The length of the testing cable can be adjusted according to the testing needs. The testing cable needs to pass through the fixed bracket for testing.

[0008] The fixed bracket serves to securely support the testing cable.

[0009] The defect detection brush is installed between two fixed brackets and is in close contact with the detection cable.

[0010] Rotating disc, winding detection cable, through clockwise rotation can drive detection cable movement to complete detection;

[0011] DC power supply, for detection circuit provides electric energy;

[0012] Multimeter, can display the current in the circuit, to determine whether the circuit is in the pass state.

[0013] Preferably, the fixed support is fixed by the upper and lower two compression housings, and the compression housings are connected by the left and right two compression springs, and the compression springs can be fixed and supported by the fixed support of different diameter specifications through extension and retraction;

[0014] Preferably, each compression housing has a rolling pulley, which is in direct contact with the detection cable and has the effect of compressing and fixing the detection cable, and the rolling pulley is connected inside the compression housing through a rotating shaft and can rotate freely through the rotating shaft;

[0015] Preferably, the defect detection brush is an insulating shell, and the inner circumference is filled with conductive metal brushes, all of which are connected with the conductive terminal, and the conductive terminal is connected into the detection circuit through the wire outside, and the defect detection brush is fixedly connected through the connecting bolt;

[0016] Preferably, the conductive metal brush has elasticity, and the middle part passes through a small space, and when the detection cable passes through the defect detection brush, all the conductive metal brushes are in close contact with the detection cable;

[0017] Preferably, the detection cable, the defect detection brush, the DC power supply and the multimeter form a conductive circuit, when the surface of the detection cable has defects, the conductive metal brushes in the defect detection brush contact with the cable, the above-mentioned conductive circuit forms a closed loop, and the multimeter can detect the current passing through.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1. The conductive metal brush with elastic deformation of the present application is in contact with the cable, the annular arrangement of the conductive metal brush can cover the surface of the cable, and if the local insulation of the cable skin is defective, the conductive metal brush will conduct the cable to be tested.

[0020] 2. The present application displays resistance value or current value through multimeter, which is simple, convenient and rapid, and solves the problem of leakage caused by liquid conductive cable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a whole structure schematic view of an electric power cable insulation defect detection device in an embodiment of the present application.

[0022] Fig. 2 Figure 1 is a schematic diagram of a fixed support in an embodiment of the present application;

[0023] Fig. 3 Figure 2 is a schematic diagram of a defect detection brush in an embodiment of the present application.

[0024] (1) detection cable; (2) fixed support; (2-1) compression housing; (2-3) rolling pulley; (2-4) defect detection brush (3); (3-1) insulating housing; (3-2) conductive metal brush; (3-3) conductive terminal; (3-4) connecting bolt; (4) rotating disc; (5) direct current power supply; (6) multimeter. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Please refer to Figs. 1-3 The present application provides a technical solution:

[0027] The length of the detection cable can be adjusted according to the detection needs. The detection cable needs to pass through the fixed support for detection. The rotating disc can wind the detection cable, and the detection can be completed by moving the detection cable through clockwise rotation. The direct current power supply provides power for the detection circuit, and the multimeter can display the current in the circuit to determine whether the circuit is in a pass-through state. The fixed support has the function of fixing and supporting the detection cable. The defect detection brush is installed between the two fixed supports and is in close contact with the detection cable. The fixed support fixes the detection cable by the compression housing. The compression housing is connected by two groups of compression springs. The compression springs can fix and support cables of different diameters by stretching and contracting. Each compression housing has a rolling pulley, which is in direct contact with the detection cable and has the function of compressing and fixing the detection cable. The defect detection brush is internally surrounded by conductive metal brushes, all of which are connected to the conductive terminal. The conductive terminal is connected to the detection circuit through wires outside the terminal. The defect detection brush is fixed by connecting bolts. The conductive metal brushes have elasticity and pass through a small space in the middle. When the detection cable passes through the defect detection brush, all the conductive metal brushes are in close contact with the detection cable. The detection cable, the defect detection brush, the direct current power supply and the multimeter form a conductive circuit. When there is a defect in the surface insulating layer of the detection cable, the conductive metal brushes in the defect detection brush come into contact with the cable. The above conductive circuit forms a closed loop, and the multimeter can detect the current passing through. In this way, it is proved that there is a defect on the surface of the cable.

[0028] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric power cable insulation defect detection apparatus characterized by comprising: It comprises: A detection cable (1) whose length can be adjusted according to the detection needs, the detection cable (1) passing through a fixed support (2); The fixed support (2) fixedly supports the detection cable (1); A defect detection brush (3) installed between the two fixed supports (2); A rotating disc (4) which can wind the detection cable (1) and move the detection cable (1) by clockwise rotation to complete the detection; A direct current power supply (5) which provides power for the detection circuit; A multimeter (6) which can display the current condition in the circuit to determine whether the circuit is in the on state.

2. The power cable insulation defect detection device according to claim 1, characterized in that: The fixed support (2) further comprises: The fixed support (2) respectively fixes the detection cable (1) by an upper and lower compression shell (2-1), the compression shell (2-1) is connected by left and right compression springs (2-2), and the compression springs (2-2) can make the fixed support (2) fixedly support cables of different diameter specifications through expansion and contraction. The core function of the compression spring (2-2) is to provide continuous and stable compression force. Its characteristics need to meet: accurate stiffness (i.e. elastic coefficient) to ensure that force and deformation are linearly related; high fatigue life to withstand frequent compression without failure; corrosion-resistant material to maintain long-term stability of elasticity under various working conditions, ensuring the reliability of the connection and the buffering and resetting effect.

3. The fixed support (2) according to claim 2 further comprises: The present application provides two fixed supports (2) which can adjust the positions of the two fixed supports (2) according to the weight, diameter and length of the detection cable and other parameters to ensure the stability of the cable during the detection operation. The fixed support (2) needs to provide stable clamping and reliable protection. Its core function is to firmly fix the position of the cable to prevent loosening or displacement, and can withstand the weight of the cable and the short-circuit electric power. The support needs to be made of insulating and corrosion-resistant materials, and is often equipped with a flexible gasket to prevent the cable from being cut. The structure should be easy to install and maintain, and meet the requirements of neat wiring and heat dissipation to ensure the long-term safe operation of the cable system.

4. The compression shell (2-1) according to claim 2 further comprises: Each compression shell (2-1) has a rolling pulley (2-3) which directly contacts the detection cable (1) and has the effect of compressing and fixing the detection cable (1), the rolling pulley (2-3) is connected inside the compression shell (2-1) through a rotating shaft (2-4) and can rotate freely through the rotating shaft (2-4). The rolling pulley (2-3) realizes smooth movement and effective protection of the cable during laying or dragging. The wheel body needs to be made of soft and wear-resistant materials such as nylon and rubber to form a smooth arc-shaped support surface to distribute pressure and prevent the cable from being scratched. The pulley must have high bearing capacity, flexible and low resistance rotation performance and excellent insulation to ensure efficient and damage-free passage of the cable.

5. The compression spring (2-2) of claim 2 further comprising: The compression spring (2-2) can be disassembled, replaced, and different lengths of compression springs can be replaced according to the diameter of the detection cable. At the same time, the elastic modulus of the compression spring (2-2) can be adjusted according to the weight of the different detection cables to ensure the stability of the cable during detection.

6. The rolling pulley (2-3) of claim 4 further comprising: The rolling pulley (2-3) can be disassembled, replaced, and different sizes of rolling pulleys (2-3) can be replaced according to the diameter of the detection cable, ensuring that the radius of curvature of the rolling pulley (2-3) is greater than the radius of curvature of the outer diameter of the detection cable.

7. The defect detection brush (3) of claim 1 further comprising: The defect detection brush (3) is an insulating shell (3-1) on the outside, and the inside circumference is filled with conductive metal brushes (3-2). All conductive metal brushes (3-2) are connected to conductive terminals (3-3), which are connected to the detection circuit through wires on the outside. The defect detection brush (3) is closed and fixedly connected by connecting bolts (3-4). The conductive terminal (3-3) must ensure excellent conductivity and low contact resistance to efficiently transmit current and reduce heat generation. The terminal must have sufficient structural strength and flexibility to provide stable insertion and extraction force to ensure close contact and resistance to vibration loosening. In addition, its material should be corrosion-resistant and oxidation-resistant, and maintain these properties during long-term use to ensure the safety and durability of the connection.

8. The defect detection brush (3) of claim 7 further comprising: The installation position of the defect detection brush (3) should be between the two fixed supports (2), and the distance between the two fixed supports (2) should be kept consistent and small to avoid the defect detection brush (3) being too far from the fixed support (2), causing the detection cable to bend and deform due to its own weight, affecting the detection effect.

9. The conductive metal brush (3-2) of claim 4, characterized in that: The conductive metal brush (3-2) is elastic and has a small space in the middle. When the detection cable (1) passes through the defect detection brush (3), all the conductive metal brushes (3-2) are in close contact with the detection cable (1). The conductive metal brush (3-2) is a dynamic conductive and physical cleaning interface. It needs to maintain a continuous and stable low-resistance contact to ensure efficient current transmission. The brush body must have excellent flexibility and wear resistance to adaptively compensate for wear, maintain contact pressure, and extend service life. The material should be highly conductive and resistant to arc oxidation, capable of working reliably in vibration conditions, while also having the ability to lightly clean the contact surface.

10. The conductive metal brush (3-2) of claim 9, further characterized in that: Adjacent conductive metal brushes (3-2) are arranged in a circular manner, and the angle between adjacent conductive metal brushes (3-2) needs to be less than 10° to ensure that the conductive metal brushes (3-2) are in full contact with the detection cable. To achieve the installation of the conductive metal brush (3-2) at a specified angle, high-precision positioning structures are required. Common methods include: design positioning pins, keyways or asymmetric mounting holes on the brush holder or bracket, which are uniquely matched with the corresponding structures of the tail of the brush body; or set clear angle scale and pointer, cooperate with adjustable locking mechanism. When installing, auxiliary alignment is needed using tool clamps, and finally fasten to ensure the angle is correct.

11. The multifunctional garbage pickup device according to claim 1, characterized in that: The detection cable (1), the defect detection brush (3), the direct current power supply (5) and the multimeter (6) can form a conductive circuit, when the surface insulation layer of the detection cable (1) has defects, the conductive metal brush (3-2) in the defect detection brush (3) contacts the cable, the above conductive circuit forms a closed loop, and the multimeter (6) can detect the current passing through. The multimeter (6) needs to accurately and stably quantify the current value. The display should be clear and intuitive, refresh quickly, and can capture the instantaneous change of current. It needs to have high precision and resolution, and can switch between direct current / alternating current measurement modes. Advanced functions should include peak hold, automatic zero adjustment and overcurrent protection to ensure safe and reliable measurement.

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