Cable high-voltage detection equipment

Abstract

The invention relates to the technical field of cable detection equipment, in particular to cable high-voltage detection equipment, which comprises a case and a cable detector, and is characterized in that the cable detector is mounted on the front side of the upper part of the case; the cable detector further comprises a guide frame fixedly arranged at the top of the case, the two ends of the guide frame are vertically arranged and fixedly provided with guide blocks, the guide blocks are used for guiding a detected cable, one end of the guide frame is provided with a jointing clamp, and the high-voltage output end of the cable detector is electrically connected with the jointing clamp through a wire. A water drum is fixedly arranged at the top of the machine box, the top of the water drum is open, a drum body of the water drum extends into the machine box, and a winding frame is connected into the water drum in a sliding mode. By arranging the electric push rod, the winding frame driven by the first motor and the second motor to automatically adjust the voltage, full-process automatic operation of automatic winding, automatic soaking and automatic pressurization of the detected cable is achieved, manual intervention is reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cable testing equipment technology, and in particular to a high-voltage cable testing device. Background Technology

[0002] Cables, as crucial carriers for power transmission and signal connection, are widely used in various fields such as industry, construction, communications, and daily life. To ensure the safety and reliability of cables in high-voltage environments, their insulation performance and withstand voltage capabilities must be rigorously tested. Currently, high-voltage cable insulation testing typically employs withstand voltage testing methods, such as water immersion withstand voltage testing. This involves applying high voltage to the cable under test to simulate the electrical stress it might experience in actual operation, thereby determining whether insulation defects or potential fault points exist. This type of testing is of great significance for preventing power system accidents and ensuring the safety of equipment and personnel, and has become a key part of cable factory inspection and maintenance.

[0003] However, traditional cable water immersion withstand voltage testing technology has several drawbacks in practical applications. First, the testing process requires a pre-prepared water source, immersing the cable under test, either entirely or partially, while also placing the current sensor in the water. This is cumbersome, time-consuming, and inefficient, as the cable must be manually removed from the water after testing. Second, for cables of different lengths, especially longer cables, manual winding is required to fit the water tank size before testing. This is not only time-consuming and labor-intensive but also prone to errors such as improper winding preventing the cable from being fully submerged, affecting the completeness and accuracy of the test. These problems hinder the automation and standardization of testing. Therefore, there is an urgent need for a high-voltage cable testing device to overcome the shortcomings of existing technology. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a high-voltage cable testing device.

[0005] The technical solution of this invention is as follows: A high-voltage cable testing device includes a chassis and a cable tester. The chassis is the main assembly body of the testing device. The cable tester is installed on the upper front side of the chassis. The cable tester is an existing cable water immersion withstand voltage testing device. It also includes a guide frame fixedly installed on the top of the chassis. The guide frame is vertically arranged at both ends, and guide blocks are fixedly installed at both ends. The guide blocks are used to guide the cable under test. A connector is provided at one end of the guide frame. The connector is used to electrically clamp the conductor of the cable under test. The high-voltage output terminal of the cable tester is electrically connected to the connector via a wire. A water tank is fixedly installed on the top of the chassis. The top of the cylinder is open and its body extends into the housing. A winding frame is slidably connected inside the cylinder. The winding frame consists of a disc frame and a rod. The rod of the winding frame slides through the bottom of the cylinder in a sealed manner. A guide rod is fixedly installed at the center of the top of the disc frame of the winding frame. The guide rod is used to wind the cable under test. An electric push rod is fixedly installed inside the housing. A connecting block is fixedly installed at the piston rod end of the electric push rod. The connecting block and the rod of the winding frame are rotatably connected. A current sensor is installed on the inner wall of the cylinder. The current detection end of the cable detector is electrically connected to the current sensor through a wire. A drive component for driving the winding frame to rotate is provided inside the housing.

[0006] Furthermore, the driving component includes a first motor, a driving gear, and a cylindrical gear. The first motor is fixedly installed inside the housing, and the driving gear is fixedly installed on the output shaft of the first motor. A cylindrical gear is fixedly arranged around the rod of the winding frame. The cylindrical gear has a hollow structure inside, and the electric push rod is located inside the hollow structure of the cylindrical gear. The driving gear and the cylindrical gear mesh with each other.

[0007] Furthermore, the bottom of the water cylinder is connected to two connecting pipes on both sides, and the connecting pipes are respectively connected to the outer wall of the same side of the chassis. The two connecting pipes are used to add and extract test water into the water cylinder, respectively. Each connecting pipe is equipped with a solenoid valve, which is used to control the opening and closing of the corresponding connecting pipe.

[0008] Furthermore, the disc frame of the winding frame has a mesh structure, the disc frame of the winding frame slides against the inner wall of the water cylinder, the guide rod has a clamping groove for holding the cable under test, and the guide rod is provided with a limiting component for stabilizing and limiting the cable under test.

[0009] Furthermore, the limiting component consists of a limiting ring and a tightening bolt. The guide rod is provided with a limiting ring, which is an elastic semi-open ring. The limiting ring is used to lock the cable under test in the guide rod clamping groove. The limiting ring is threaded with a tightening bolt, which is used to adjust the tightness of the limiting ring on the guide rod.

[0010] Furthermore, the guide frame is provided with a pushing mechanism for switching the wiring clamp. The pushing mechanism includes a mounting plate fixedly connected to the guide frame. A U-shaped connecting rod is slidably connected to the mounting plate. One end of the connecting rod contacts the disc frame of the winding frame, and the other end of the connecting rod is connected to the wiring clamp. A spring is provided between the wiring clamp and the guide frame.

[0011] Furthermore, guide members are provided at both ends of the guide frame. Each guide member includes a mounting base, a guide wheel, and a motor. The ends of the guide frame near the guide block are fixedly connected to a pair of mounting bases. Guide wheels are rotatably mounted on the mounting bases. Motors that drive the guide wheels are provided on the mounting bases. The guide wheels are used to conduct the cable under test.

[0012] Furthermore, a support block is fixedly installed on the housing of the cable detector near the adjustment knob, and a second motor is fixedly installed on the support block. The output shaft of the second motor is connected to the rotating shaft of the adjustment knob.

[0013] The present invention has the following advantages: 1. This invention achieves fully automated operation of the entire process of automatically winding, immersing in water, and pressurizing the cable under test by setting an electric push rod, a winding frame driven by a first motor, and an automatic voltage adjustment by a second motor, thereby reducing manual intervention and improving testing efficiency.

[0014] 2. This invention uses a liftable and rotatable winding frame in conjunction with a mesh disc frame and guide rod, which can flexibly adapt to cables of different lengths and specifications. It eliminates the need for pre-manual winding, avoids blind spots in the detection caused by improper winding, ensures that the cable is fully and evenly immersed in water, and improves the integrity and accuracy of the detection.

[0015] 3. The present invention can also link the pushing mechanism with the winding frame, so that the connector clamp automatically clamps the cable conductor after the winding frame is immersed in water, avoiding the risk of human error or contact with high voltage. With the help of the limiting component, the cable end is effectively fixed to prevent slippage during the winding process and ensure the stability of the test. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a diagram showing the connection relationships of components such as the chassis, cable tester, guide frame, and water tank of this invention.

[0018] Figure 3 This is a schematic diagram of the components of the present invention, including the chassis, water tank, electric push rod, and drive unit.

[0019] Figure 4 This is a diagram showing the connection relationships of components such as the water tank, winding frame, guide rod, and electric push rod of the present invention.

[0020] Figure 5 This is a schematic diagram showing the working relationship between the drive gear, the cylindrical gear, and the electric push rod of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the winding frame, guide rod, limiting ring, and tightening bolt of the present invention.

[0022] Figure 7 This is a diagram showing the connection relationship between the connector, mounting plate, connecting rod, and spring of the present invention.

[0023] Figure 8 This is a schematic diagram of the guide frame, mounting base, guide wheel, and motor of the present invention.

[0024] Figure 9 This is a schematic diagram of the cable detector, adjustment knob, support block, and second motor of the present invention.

[0025] Component names and serial numbers in the diagram: 100-Cable under test, 1-Chassis, 2-Cable tester, 21-High voltage output terminal, 22-Current detection terminal, 23-Adjustment knob, 3-Guide frame, 31-Guide block, 32-Wire clamp, 4-Water tank, 41-Winding frame, 42-Guide rod, 5-Electric push rod, 51-Connecting block, 6-Current sensor, 7-Drive component, 71-First motor, 72-Drive gear, 73-Columnar gear, 8-Connecting pipe, 81-Solenoid valve, 9-Limiting component, 91-Limiting ring, 92-Tightening bolt, 10-Pushing mechanism, 101-Mounting plate, 102-Connecting rod, 103-Spring, 11-Guide component, 111-Mounting base, 112-Guide wheel, 113-Motor, 12-Support block, 121-Second motor. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] A high-voltage cable testing device, such as Figures 1-4As shown, the device includes a chassis 1 and a cable tester 2. The chassis 1 is the main assembly of the testing equipment. The cable tester 2 is installed on the front upper part of the chassis 1. The cable tester 2 is an existing cable water immersion withstand voltage test device. It also includes a guide frame 3 fixedly mounted on the top of the chassis 1. The guide frame 3 is vertically arranged at both ends, and guide blocks 31 are fixedly installed at both ends. The guide blocks 31 are used to guide the cable 100 under test. A connector 32 is provided at one end of the guide frame 3. The connector 32 is used to electrically clamp the conductor of the cable 100 under test. The high-voltage output terminal 21 of the cable tester 2 is electrically connected to the connector 32 via a wire. A water tank 4 is fixedly mounted on the top of the chassis 1. The top of the water tank 4 is open. The cylinder extends into the housing 1. A winding frame 41 is slidably connected inside the water cylinder 4. The winding frame 41 consists of a disc frame and a rod. The rod of the winding frame 41 slides through the bottom of the water cylinder 4 in a sealed manner. A guide rod 42 is fixedly installed at the center of the top of the disc frame of the winding frame 41. The guide rod 42 is used to wind the cable 100 under test. An electric push rod 5 is fixedly installed inside the housing 1. A connecting block 51 is fixedly installed at the end of the piston rod of the electric push rod 5. The connecting block 51 and the rod of the winding frame 41 are rotatably connected. A current sensor 6 is installed on the inner wall of the water cylinder 4. The current detection end 22 of the cable detector 2 is electrically connected to the current sensor 6 through a wire. The housing 1 is equipped with a device for driving the winding frame 41. The rotating drive unit 7; during high-voltage testing, first add clean water to the water tank 4, then pass the cable under test 100 through the guide block 31 at one end of the guide frame 3, then fix the cable under test 100 to the guide rod 42 and pass it out through the guide block 31 at the other end of the guide frame 3. Then, the drive unit 7 drives the winding frame 41 to rotate, so that the cable under test 100 is continuously wound onto the winding frame 41 until the cable under test 100 is wound on the winding frame 41 with the appropriate number of turns. Then, the drive unit 7 is turned off and the electric push rod 5 is started. The electric push rod 5 drives the cable under test 100 on the winding frame 41 to be immersed in the water in the water tank 4. Finally, the guide rod 32 is used to guide the cable under test 100 through the guide block 31 at one end of the guide frame 3. The cable is clamped, and then the cable tester 2 is turned on. By rotating the adjustment knob 23 on the cable tester 2, the voltage input to the cable under test 100 at the high voltage output terminal 21 is continuously increased until the test voltage reaches the withstand voltage of the cable under test 100. The high test voltage is maintained for a period of time. When the insulation of the cable under test 100 has defects or insufficient withstand voltage, the high voltage will break down the insulation layer. The current forms a circuit through the water. The leakage current or breakdown current in the water is detected by the current sensor 6. The current sensor 6 returns the detection signal to the current detection terminal 22 of the cable tester 2. The cable tester 2 records the breakdown voltage value accordingly, thereby evaluating the insulation strength of the cable under test 100.

[0028] like Figure 3 and Figure 5As shown, the driving component 7 includes a first motor 71, a drive gear 72, and a cylindrical gear 73. The first motor 71 is fixedly installed inside the housing 1, and the drive gear 72 is fixedly installed on the output shaft of the first motor 71. The cylindrical gear 73 is fixedly arranged on the outer periphery of the rod of the winding frame 41. The cylindrical gear 73 has a hollow structure inside. The electric push rod 5 is located inside the hollow structure of the cylindrical gear 73. The drive gear 72 and the cylindrical gear 73 mesh with each other. The first motor 71 meshes with the cylindrical gear 73 through the drive gear 72, so that the cylindrical gear 73 drives the winding frame 41 to rotate and wind the cable 100 under test. When the first motor 71 is turned off and the electric push rod 5 is started, the electric push rod 5 drives the winding frame 41 and the cylindrical gear 73 to rise and fall synchronously. At this time, the cylindrical gear 73 will maintain the meshing state with the drive gear 72.

[0029] like Figure 3 and Figure 4 As shown, the bottom of the water cylinder 4 is connected to two connecting pipes 8 on both sides. The connecting pipes 8 are connected to the outer wall of the same side of the casing 1. The two connecting pipes 8 are used to add and extract test water to the water cylinder 4, respectively. Each connecting pipe 8 is equipped with a solenoid valve 81, which is used to control the opening and closing of the corresponding connecting pipe 8.

[0030] like Figure 5 and Figure 6 As shown, the disc frame of the winding frame 41 has a mesh structure. The disc frame of the winding frame 41 slides against the inner wall of the water cylinder 4. The guide rod 42 has a clamping groove for holding the cable 100 under test. The guide rod 42 is provided with a limiting member 9 for stabilizing and limiting the cable 100 under test.

[0031] like Figure 5 and Figure 6 As shown, the limiting component 9 consists of a limiting ring 91 and a tightening bolt 92. The guide rod 42 is provided with a limiting ring 91, which is an elastic semi-open ring. The limiting ring 91 is used to lock the cable 100 under test in the clamping groove of the guide rod 42. The limiting ring 91 is threaded with a tightening bolt 92, which is used to adjust the tightness of the limiting ring 91 on the guide rod 42.

[0032] like Figure 1 , Figure 7 and Figure 8 As shown, guide members 11 are provided at both ends of the guide frame 3. The guide member 11 includes a mounting base 111, a guide wheel 112 and a motor 113. The ends of the guide frame 3 near the guide block 31 are fixedly connected to the mounting base 111 in pairs. The guide wheel 112 is rotatably mounted on the mounting base 111. The motor 113 that drives the guide wheel 112 is provided on the mounting base 111. The guide wheel 112 is used to conduct the test cable 100 so that the test cable 100 can be smoothly guided to the winding frame 41 for winding.

[0033] When using the high-voltage cable testing equipment, first open the solenoid valve 81 on one side of the connecting pipe 8, and then connect an external water pump to inject an appropriate amount of clean water into the water cylinder 4 to ensure the water immersion environment required for subsequent testing in the water cylinder 4. After the preparation is complete, the operator inserts the cable to be tested 100 through the guide block 31 at one end of the guide frame 3, and then manually fixes the cable to be tested 100 onto the guide rod 42 of the winding frame 41. Specifically, the cable to be tested 100 is inserted into the clamping groove on the guide rod 42, and the cable to be tested 100 is securely locked in this position by the limiting member 9 consisting of the limiting ring 91 and the tightening bolt 92 to prevent it from coming loose during the winding process. After the fixing is completed, pull the cable to let it pass through the guide block 31 at the other end of the guide frame 3. At this time, the drive unit 7 can be started: the first motor 71 runs and drives the drive gear 72 on its output shaft to rotate. The drive gear 72 and the guide rod 41 are fixed to the guide rod 41. The cylindrical gears 73 on the periphery of the winding frame 41 mesh with each other, thereby transmitting power to the winding frame 41 and driving it to start rotating. During the rotation, the guide rod 42 begins to wind the cable under test 100. At the same time, the guide members 11 at both ends of the guide frame 3 also start to work. The motor 113 on the guide member 11 drives its guide wheel 112 to rotate, which helps the cable under test 100 to wind onto the winding frame 41 more smoothly and evenly. When the winding frame 41 has wound enough turns for effective testing, the first motor 71 is turned off and the winding frame 41 stops rotating. Then, the electric push rod 5 is activated. The piston rod of the electric push rod 5 extends downward and pushes the entire winding frame 41 to slide downward along the water cylinder 4 through the connecting block 51 at the end until the portion of the cable under test 100 wound on the winding frame 41 is completely submerged in the water in the water cylinder 4, creating a conductive circuit condition for high-voltage testing.

[0034] like Figure 1 and Figure 7 As shown, a pushing mechanism 10 is provided on the guide frame 3. The pushing mechanism 10 is used to switch the wiring clamp 32. The pushing mechanism 10 includes a mounting plate 101 fixedly connected to the guide frame 3. A U-shaped connecting rod 102 is slidably connected to the mounting plate 101. One end of the connecting rod 102 is in contact with the disc frame of the winding frame 41, and the other end of the connecting rod 102 is connected to the wiring clamp 32. A spring 103 is provided between the wiring clamp 32 and the guide frame 3. When the winding frame 41 is not immersed in water in the water tank 4, the winding frame 41 contacts and pushes up the connecting rod 102. The connecting rod 102 will overcome the elastic force of the spring 103 and force the wiring clamp 32. When the winding frame 41 is immersed in water in the water tank 4, the winding frame 41 disengages from the connecting rod 102. At this time, the wiring clamp 32 automatically clamps the conductor of the cable 100 under the action of the spring 103.

[0035] like Figure 1 and Figure 9As shown, a support block 12 is fixedly installed on the housing of the cable tester 2 near the adjustment knob 23. A second motor 121 is fixedly installed on the support block 12. The output shaft of the second motor 121 is connected to the rotating shaft of the adjustment knob 23. The adjustment knob 23 is automatically driven to rotate by the second motor 121, thereby saving the manual operation of adjusting the voltage.

[0036] Before the winding frame 41 descends, its disc frame will press against the connecting rod 102 of the pushing mechanism 10, causing the terminal clamp 32 to open against the spring force of the spring 103. When the winding frame 41 carrying the cable under test 100 is immersed in water, once the disc frame of the winding frame 41 no longer presses against the connecting rod 102, the connecting rod 102 will reset under the action of the spring 103, causing the terminal clamp 32 to close automatically, thus firmly and electrically clamping the exposed conductor end of the cable under test 100. At this point, the high voltage output terminal 21 of the cable tester 2 is electrically connected to the terminal clamp 32 through the wire. When the formal test begins, the operator turns on the cable tester 2. To accurately control the test voltage and reduce manual operation, the second motor 121 can be started. The second motor 121 automatically and uniformly rotates the adjustment knob 23, so that the high voltage output terminal 21 of the cable tester 2 applies voltage to the cable under test. The voltage on the conductor of cable 100 steadily increases from zero. As the voltage continues to rise, it reaches the preset rated withstand voltage value of the cable 100 under test and is maintained for a period of time. Under this high voltage, if there are any defects in the cable insulation layer or its insulation strength is insufficient, the high voltage will instantly break down the insulation, forming a current path in the water medium. At this time, the current sensor 6, which is pre-installed on the inner wall of the water tank 4, will sensitively detect the leakage current or breakdown current generated in the water and feed the current signal back to the current detection terminal 22 of the cable tester 2 in real time. After receiving this signal, the cable tester 2 will immediately record the voltage value at this moment, i.e., the breakdown voltage, so as to accurately evaluate the true insulation strength performance of the cable 100 under test. After the test is completed, the electric push rod 5 will lift the winding frame 41 and drain the test water in the water tank 4 through another connecting pipe 8, thus completing the entire test process.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable high-voltage detection device, comprising a machine box (1) and a cable detector (2), the cable detector (2) being mounted on the upper part of the machine box (1); further comprising a guide frame (3) fixed on the top of the machine box (1), the guide frame (3) being vertically arranged at both ends and being fixed with guide blocks (31) at both ends, one end of the guide frame (3) being provided with a wire clamp (32), the high-voltage output end (21) of the cable detector (2) being electrically connected with the wire clamp (32) through a wire, a water cylinder (4) being fixed on the machine box (1), a winding frame (41) being slidably connected in the water cylinder (4), the winding frame (41) being composed of a disc frame and a rod body, the rod body of the winding frame (41) being sealingly slid through the bottom of the water cylinder (4), a guide rod (42) being fixed on the top center of the disc frame of the winding frame (41), an electric push rod (5) being fixedly installed in the machine box (1), a connecting block (51) being fixed on the end of the piston rod of the electric push rod (5), the connecting block (51) being rotatably connected with the rod body of the winding frame (41), a current sensor (6) being arranged on the inner wall of the water cylinder (4), the current detection end (22) of the cable detector (2) being electrically connected with the current sensor (6) through a wire, and a driving member (7) being arranged in the machine box (1) for driving the winding frame (41) to rotate. characterized in that The driving member (7) comprises a first motor (71), a driving gear (72) and a columnar gear (73), the first motor (71) being fixedly installed in the machine box (1), the driving gear (72) being fixed on the output shaft of the first motor (71), the columnar gear (73) being fixed on the periphery of the rod body of the winding frame (41), the columnar gear (73) being hollow, the electric push rod (5) being located inside the hollow structure of the columnar gear (73), and the driving gear (72) and the columnar gear (73) being meshed with each other.

2. The cable high voltage detection device of claim 1, wherein, Two connecting pipes (8) are respectively communicated at both sides of the bottom of the water cylinder (4), the connecting pipes (8) being respectively communicated to the same side outer wall of the machine box (1), the two connecting pipes (8) being respectively used for adding and extracting detection water to the water cylinder (4), and electromagnetic valves (81) being arranged on the connecting pipes (8).

3. The cable high voltage detection device of claim 2, wherein, The disc frame of the winding frame (41) is a mesh structure, the disc frame of the winding frame (41) being slidably attached to the inner wall of the water cylinder (4), the guide rod (42) being provided with a clamping groove for clamping the measured cable (100), and a limiting member (9) being arranged on the guide rod (42) for limiting the measured cable (100).

4. The cable high voltage detection device of claim 3, wherein, The limiting member (9) is composed of a limiting ring (91) and a tension bolt (92), the limiting ring (91) being arranged on the guide rod (42), the limiting ring (91) being a half-open ring body, the limiting ring (91) being used for locking the measured cable (100) in the clamping groove of the guide rod (42), and the tension bolt (92) being threadedly arranged on the limiting ring (91).

5. The cable high voltage detection device of claim 4, wherein, ​ 6. The cable high voltage detection device of claim 5, wherein, The guiding frame (3) is provided with a push mechanism (10), the push mechanism (10) is used for opening and closing a wire clamp (32), the push mechanism (10) comprises a mounting plate (101) fixedly connected to the guiding frame (3), the mounting plate (101) is slidably connected with a "U"-shaped bending connecting rod (102), one end of the connecting rod (102) is in contact with a disc holder of the winding frame (41), the other end of the connecting rod (102) is connected to the wire clamp (32), and a spring (103) is arranged between the wire clamp (32) and the guiding frame (3).

7. A cable high voltage detection device according to claim 6, characterised in that, The guiding frame (3) is provided with a guide (11) at both ends, the guide (11) comprises a mounting seat (111), a guide wheel (112) and a motor (113), the end of the guiding frame (3) close to the guiding block (31) is fixedly connected with the mounting seat (111) in pairs, the guide wheel (112) is rotatably installed on the mounting seat (111), and the motor (113) for driving the guide wheel (112) is arranged on the mounting seat (111).

8. The cable high voltage detection device of claim 7, wherein, The cable detector (2) is provided with a supporting block (12) on the shell close to the adjusting knob (23), the second motor (121) is fixedly arranged on the supporting block (12), and the output shaft of the second motor (121) is connected with the rotating shaft of the adjusting knob (23).

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