A high voltage cable insulation testing device

Abstract

This invention relates to the field of cable insulation testing technology, and discloses a high-voltage cable insulation testing device, including a housing, two terminals disposed on one side of the housing, and a crank handle disposed on the other side of the housing, a base plate disposed at the bottom of the housing, a positioning component disposed between the base plate and the housing, and an adsorption component disposed at the bottom of the positioning component; the adsorption component is used to increase the adsorption force between the base plate and the table when the pressing component is pressed; the positioning component includes a rotating column disposed at the bottom of the housing, two pressing components disposed on the rotating column, and a positioning component disposed at the bottom of the pressing components. Through the positioning component and the adsorption component, the adsorption force of the base plate on the table can be increased, thereby increasing the stability of the base plate and preventing the base plate and housing from shaking when the tester turns the crank handle for testing. The device allows for adjustment of the rotation direction and fixed positioning after adjustment, improving the stability, convenience, and adaptability of the testing device.

Description

Technical Field

[0001] This invention relates to the field of cable insulation testing technology, and more particularly to a high-voltage cable insulation testing device. Background Technology

[0002] Before performing insulation testing on high-voltage cables, a power-off verification is required. Disconnect the power supply to the equipment at both ends of the cable, hang a "Do Not Operate" warning sign, and use a high-voltage detector to confirm that there is no voltage on the cable (the detector needs to be calibrated regularly). Then, use a special discharge rod (resistance ≥100kΩ) to first contact the ground end, and then discharge phase by phase to ground, with a discharge time ≥2 minutes (extended to 5 minutes for long-distance cables). Finally, wipe the cable termination with anhydrous alcohol to remove surface oil and dust to avoid surface leakage affecting the test results. After the preparation work is completed, meter calibration and pre-testing are required. Run the megohmmeter at 120 rpm without load; the pointer should point to "∞". Short-circuit the L and E terminals; the pointer should point to "0" (verifying that the megohmmeter is normal). During the test, connect the two test leads to the two terminals (not shown in the figure), and connect the end of the test leads to the two cables to be tested through the clamps at the ends of the test leads. Rotate the crank handle at a stable 120 rpm for 1 minute, and then read the insulation resistance value. After testing, the cable must be discharged immediately to avoid residual charge. Disconnect the wiring, check the cable terminals for damage, and restore the equipment wiring. If the pointer points to "∞", it means there is no broken contact between the two cables. If the pointer points to "0", it means there is a short circuit between the two cables, and the cables are damaged and need to be replaced or repaired.

[0003] Existing technologies for cable insulation testing suffer from insufficient stability and inconvenient directional adjustment. Traditional megohmmeters require manual handling or placement on a flat surface. The reaction force generated by rotating the handle during testing easily causes the device to shake, especially on uneven outdoor ground or rough tabletops. This shaking affects the stability of the rotation speed (which needs to be maintained at 120 rpm), leading to errors in insulation resistance readings and even misjudgments due to poor contact. Furthermore, megohmmeters are typically placed directly on a table, requiring the tester to adjust their position around the device or lift it up and adjust it to a suitable angle for easy cranking when rotating the handle. This operation is inconvenient, cumbersome, and time-consuming. Especially in confined spaces (such as inside switch cabinets), the limited position can easily lead to fatigue and operational errors. If the device tilts during testing, the test leads may come loose, posing a risk of electric shock due to residual charge in the cable. The device lacks adaptability, safety, and stability, failing to improve overall stability during testing while simultaneously ensuring ease of adjustment and adaptability. Summary of the Invention

[0004] Given that existing technologies cannot simultaneously satisfy the convenience and adaptability of adjustment testing, as well as the overall stability during cable insulation testing, a high-voltage cable insulation testing device is proposed.

[0005] Its purpose is to allow for adjustment and rotation in any direction during testing to facilitate the rotation of the crank handle, and to achieve stable positioning and fixation after adjustment, thereby improving the stability, convenience and adaptability of the device for testing.

[0006] The technical solution of the present invention is a high-voltage cable insulation testing device, including a housing, two terminals disposed on one side of the housing, and a crank disposed on the other side of the housing, as well as a base plate disposed at the bottom of the housing, a positioning component disposed between the base plate and the housing, and an adsorption component disposed at the bottom of the positioning component;

[0007] The adsorption component is used to increase the adsorption force between the base plate and the table when the pressing component is pressed; the positioning component includes a rotating column set at the bottom of the housing, two pressing components set on the rotating column, and a positioning component set at the bottom of the pressing component.

[0008] The top of the rotating column is provided with a limiting plate, which limits the rotation within the base plate;

[0009] The pressing assembly includes pressing blocks disposed on both sides of the housing, and an inverted L-shaped rod disposed on one side of the pressing block. The inverted L-shaped rod is slidably disposed within the housing, and its bottom extends into the interior of the rotating column.

[0010] The positioning component includes a connecting block disposed on one side of the rotating column, a spring disposed on one side of the connecting block, a positioning block disposed on the other side of the connecting block, a positioning groove disposed on one side of the positioning block, a circular groove disposed inside the base plate, a rubber strip disposed on the circular groove, and an extrusion groove disposed between the positioning block and the connecting block, wherein the bottom of the inverted L-shaped rod abuts against the extrusion groove.

[0011] Furthermore, the positioning block is in the shape of a minor arc, and the spring is fixedly installed inside the rotating column, which is T-shaped overall.

[0012] Furthermore, the positioning groove and the several rubber strips arranged in the annular array are matched and snapped together.

[0013] Furthermore, in the initial state, the bottom of the inverted L-shaped rod abuts against one end of the extrusion groove.

[0014] Furthermore, the adsorption component includes an upward pull assembly disposed inside the base plate and an adsorption assembly disposed at the bottom of the base plate. The upward pull assembly includes a movable rod symmetrically disposed at the bottom of the positioning block, sliding columns symmetrically disposed on both sides of the bottom of the movable rod, a sealing sliding groove opened at the bottom of the circular groove, a sealing plate disposed inside the sealing sliding groove, a fixing plate obliquely disposed at the top of the sealing plate, and a sliding hole opened through the fixing plate, with the sliding columns on both sides limited to sliding within the sliding hole.

[0015] Furthermore, a limiting block is fixedly connected to the middle of the sealing plate, and the limiting block is slidably disposed in a limiting groove opened on the rotating column.

[0016] Furthermore, the adsorption assembly includes a communicating cavity opened at the bottom of the sealed sliding groove, and several rubber suction cups disposed at the bottom of the base plate and communicating with the communicating cavity.

[0017] Furthermore, the sealing plate is in a sealed sliding connection with the sealing sliding groove and the side wall of the rotating column.

[0018] Furthermore, a support plate for supporting the sealing plate is provided at the bottom of the rotating column.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By using positioning and adsorption components, the adhesion of the base plate to the table can be increased, thereby increasing the stability of the base plate. This prevents the base plate and housing from shaking when the tester rotates the crank handle. The rotation can be adjusted in any direction, and the positioning is fixed after adjustment, which improves the stability, convenience and adaptability of the device for testing.

[0021] 2. When the sealing plate moves upward, the space of the sealing sliding groove decreases and the space of the connecting cavity increases. As the pressing block is squeezed, the suction cup at the bottom is also squeezed and adsorbed. Furthermore, as the sealing plate gradually moves upward, the pressure in the connecting cavity decreases, allowing the entire base plate and device to be stably squeezed and adsorbed on the table, improving stability and preventing shaking when the crank is turned, which would affect the normal test speed of the crank. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the overall appearance of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the entire invention from another angle;

[0024] Figure 3 This is a schematic diagram of the overall side cross-sectional structure of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0026] Figure 5 This is a schematic diagram of the exploded dissection structure of the internal structure of the present invention;

[0027] Figure 6 This is a schematic cross-sectional view of the base plate of the present invention;

[0028] Figure 7This is an exploded view of the positioning component and sealing plate of the present invention.

[0029] Figure 8 This is an exploded structural diagram of the positioning component and the rotating column of the present invention.

[0030] In the picture:

[0031] 1. Housing; 11. Terminal block; 12. Crank handle; 2. Base plate; 3. Rotating column; 4. Limiting plate; 5. Positioning assembly; 51. Connecting block; 52. Spring; 53. Positioning block; 54. Positioning groove; 55. Circular groove; 56. Rubber strip; 57. Extrusion groove; 6. Pull-up assembly; 61. Moving rod; 62. Sliding column; 63. Sealing sliding groove; 64. Sealing plate; 65. Fixing plate; 66. Sliding hole; 7. Limiting block; 8. Limiting groove; 9. Adsorption assembly; 91. Communicating cavity; 92. Rubber suction cup; 10. Support plate. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Example 1, referring to Figures 1-8 This invention provides a first embodiment of a high-voltage cable insulation testing device, comprising a housing 1, two terminals 11 mounted on one side of the housing 1, and a crank 12 mounted on the other side of the housing 1. It also includes a base plate 2 mounted on the bottom of the housing 1, a positioning component mounted between the base plate 2 and the housing 1, and an adsorption component mounted on the bottom of the positioning component. The adsorption component increases the adsorption force between the base plate 2 and the table surface when the pressing component is pressed. The positioning component includes a rotating column 3 fixedly connected to the bottom of the housing 1, two pressing components mounted on the rotating column 3, and a positioning component 5 disposed at the bottom of the pressing components. A limiting plate 4 is fixedly connected to the top of the rotating column 3, limiting the rotation of the rotating column 3 at the bottom. Inside plate 2; the pressing assembly includes pressing blocks slidably connected to both sides of housing 1, and an inverted L-shaped rod fixedly connected to one side of the pressing blocks. The inverted L-shaped rod is limited to sliding inside housing 1, and its bottom extends into the interior of rotating column 3; the positioning assembly 5 includes a connecting block 51 slidably connected to the interior of one side of rotating column 3, a spring 52 fixedly connected to one side of connecting block 51, a positioning block 53 fixedly connected to the other side of connecting block 51, a positioning groove 54 opened on one side of positioning block 53, a circular groove 55 opened inside base plate 2, a rubber strip 56 fixedly connected to the circular groove 55, and an extrusion groove 57 opened between positioning block 53 and connecting block 51, with the bottom of the inverted L-shaped rod abutting against the extrusion groove 57.

[0034] Specifically, before performing insulation testing on high-voltage cables, it is necessary to first disconnect the power supply and verify voltage. Disconnect the power supply to the equipment at both ends of the cable, hang a "Do Not Operate" warning sign, and use a high-voltage detector to confirm that there is no voltage on the cable (the detector needs to be calibrated regularly). Then, use a special discharge rod (resistance ≥100kΩ) to first contact the ground end, and then discharge phase by phase to ground, with a discharge time ≥2 minutes (extended to 5 minutes for long-distance cables). Finally, wipe the cable termination with anhydrous alcohol to remove surface oil and dust to avoid surface leakage affecting the test results. After the preparation work is completed, it is necessary to calibrate the meter and perform a pre-test. Run the megohmmeter at 120 rpm without load; the pointer should point to "∞". Short-circuit the L and E terminals; the pointer should point to "0" (verifying that the megohmmeter is normal). During the test, connect the two test leads to the two terminals 11 (not shown in the figure), and connect them between the two cables to be tested through the terminal clamps at the ends of the test leads. Rotate the crank handle 12 at a stable speed of 120 rpm for 1 minute, and then read the insulation resistance value. After testing, the cable must be discharged immediately to avoid residual charge. Disconnect the wiring, check the cable terminals for damage, and restore the equipment wiring. If the pointer points to "∞", it means there is no broken contact between the two cables. If the pointer points to "0", it means there is a short circuit between the two cables, and the cables are damaged and need to be replaced or repaired.

[0035] During testing, the testing device is placed on the testing table. One hand rotates the housing 1 to a direction that facilitates turning the crank handle 12, while the other hand holds and presses the pressing block in the pressing assembly. This causes the bottom of the inverted L-shaped rod to press against the pressing groove 57 on the top of the positioning block 53, causing the positioning blocks 53 on both sides to be pressed and moved. The spring 52 is stretched, and the positioning groove 54 on the positioning block 53 presses against the rubber strip 56. Through the pressing action between them, the positioning groove 54 is locked by the rubber strip 56. Since the connecting block 51 is limited within the rotating column 3, the rotating column 3 cannot be easily rotated, thus achieving the effect of positioning and locking the housing 1. In this process, after the pressing block is pressed down, it will press against the adsorption component, increasing the adsorption force of the base plate 2 on the table, thereby increasing the stability of the base plate 2. This prevents the base plate 2 and housing 1 from shaking when the tester turns the crank handle 12. The device can be adjusted to rotate in any direction and the positioning is fixed after adjustment, improving the stability, convenience and adaptability of the device test. When pressing and locking, the adsorption force is simultaneously enhanced to counteract the reaction force and shaking of the crank handle 12. The adsorption component is designed for relatively smooth test surfaces, meaning that the adsorption component can generate adsorption force on the test surface after being squeezed. However, it is not suitable for rough or uneven surfaces, or outdoor ground and other similar usage scenarios.

[0036] Reference Figure 5 and Figures 7-8 The positioning block 53 is in the shape of a slight arc, and the spring 52 is fixedly connected inside the rotating column 3. The rotating column 3 is T-shaped as a whole.

[0037] Specifically, the shape of the positioning block 53 allows it to better fit the circular groove 55, enhancing the positioning and locking effect.

[0038] Reference Figures 4-6 The positioning groove 54 and the annular array are matched and snapped together by several rubber strips 56 mounted on the circular groove 55.

[0039] Specifically, the positioning block 53 is made of hard material, and the rubber strip 56 is made of elastic material. This not only satisfies the positioning and locking effect, but also provides a buffering effect when locking and squeezing, reducing the jerking sensation when squeezing and locking.

[0040] Reference Figure 4 In the initial state, the bottom of the inverted L-shaped rod abuts against one end of the extrusion groove 57.

[0041] Specifically, when the inverted L-shaped rod is squeezed, its bottom slides along one end of the extrusion groove 57, causing the positioning block 53 to be pushed out, thereby achieving the extrusion and engagement of the rubber strip 56 and the positioning groove 54.

[0042] Example 2, refer to Figures 3-7 This is the second embodiment of the present invention, which differs from the first embodiment in that: the adsorption component includes an upward pull assembly 6 installed inside the base plate 2, and an adsorption assembly 9 installed at the bottom of the base plate 2. The upward pull assembly 6 includes a movable rod 61 symmetrically fixedly connected to the bottom of the positioning block 53, sliding columns 62 symmetrically fixedly connected to both sides of the bottom of the movable rod 61, a sealing sliding groove 63 opened at the bottom of the circular groove 55, and the diameter of the sealing sliding groove 63 is larger than the diameter of the circular groove 55, a sealing plate 64 slidably connected inside the sealing sliding groove 63, a fixing plate 65 obliquely fixedly connected to the top of the sealing plate 64, a sliding hole 66 penetrating the fixing plate 65, and the sliding columns 62 on both sides being limited to slide within the sliding hole 66.

[0043] Specifically, as the positioning block 53 moves toward the rubber strip 56, the positioning block 53 simultaneously drives the moving rod 61 to move, causing the sliding column 62 to move within the sliding hole 66. Since the sealing plate 64 is confined within the sealing sliding groove 63, when the sliding column 62 moves within the sliding hole 66, the fixing plate 65 will drive the sealing plate 64 to move upward synchronously, thereby increasing the space at the bottom of the sealing plate 64 and generating a negative pressure effect, enhancing the adsorption effect of the adsorption component 9 on the table. The two work together to ensure that the device can be stably adsorbed on a relatively smooth table, improving the stability of the crank handle 12 rotation during testing, ensuring the stability of the crank handle 12 speed during testing, and thus improving the accuracy of the test results.

[0044] Reference Figures 7-8 A limiting block 7 is fixedly connected to the middle of the sealing plate 64, and the limiting block 7 is slidably connected in the limiting groove 8 opened on the rotating column 3.

[0045] Specifically, before the test, when the rotating device is rotated to a suitable angle, under the action of the limit block 7, the rotating column 3 will drive the sealing plate 64 to rotate synchronously, avoiding excessive force between the moving rod 61 and the fixed plate 65, and improving the service life of the device.

[0046] Reference Figures 3-4 The adsorption component 9 includes a communicating cavity 91 opened at the bottom of the sealed sliding groove 63, and several rubber suction cups 92 fixedly connected to the bottom of the base plate 2 and communicating with the communicating cavity 91.

[0047] Specifically, when the sealing plate 64 moves upward, the space of the sealing sliding groove 63 decreases, and the space of the connecting cavity 91 increases. As the pressing block is squeezed, the rubber suction cup 92 at the bottom is also squeezed and adsorbed. Furthermore, as the sealing plate 64 gradually moves upward, the pressure in the connecting cavity 91 decreases, allowing the entire base plate 2 and the device to be stably squeezed and adsorbed on the table, thus improving stability and preventing the crank handle 12 from shaking when it is turned, which would affect the rotation speed of the crank handle 12 during normal testing.

[0048] Reference Figures 3-4 The sealing plate 64 is in a sealed sliding connection with the sealing sliding groove 63 and the side wall of the rotating column 3.

[0049] Specifically, the good sealing between them ensures that negative pressure is generated inside the communicating cavity 91.

[0050] Reference Figures 3-4 The bottom of the rotating column 3 is fixedly connected to a support plate 10 for supporting the sealing plate 64.

[0051] Specifically, the support plate 10 is used to support the sealing plate 64 and further improve the sealing effect between the sealing plate 64 and the rotating column 3. The rest of the structure is the same as that in Embodiment 1.

[0052] Based on embodiments 1-2, the working principle of this invention is as follows: During testing, the testing device is placed on the testing table. One hand rotates the housing 1 to a direction convenient for turning the crank handle 12, while the other hand holds and presses the pressing block in the pressing assembly. This causes the bottom of the inverted L-shaped rod to press the pressing groove 57 on the top of the positioning block 53, causing the positioning blocks 53 on both sides to be pressed and moved. The spring 52 is stretched, and the positioning groove 54 on the positioning block 53 presses the rubber strip 56. Through the pressing action between them, the positioning groove 54 is locked by the rubber strip 56. Since the connecting block 51 is limited within the rotating column 3, the rotating column 3 cannot be easily rotated, thereby achieving the effect of positioning and locking the housing 1. In addition, during this process, after the pressing block is pressed down, it will press the adsorption component, increasing the adsorption force of the base plate 2 on the table, thereby increasing the stability of the base plate 2. This prevents the base plate 2 and housing 1 from shaking when the tester turns the crank handle 12 for testing. The device can be adjusted to rotate in any direction and the positioning is fixed after adjustment, improving the stability, convenience, and adaptability of the device testing.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-voltage cable insulation testing device, comprising a housing, two terminals disposed on one side of the housing, and a crank handle disposed on the other side of the housing, characterized in that: It also includes a base plate disposed at the bottom of the housing, a positioning component disposed between the base plate and the housing, and an adsorption component disposed at the bottom of the positioning component; The adsorption component is used to increase the adsorption force between the base plate and the table when the pressing component is pressed; the positioning component includes a rotating column set at the bottom of the housing, two pressing components set on the rotating column, and a positioning component set at the bottom of the pressing component. The top of the rotating column is provided with a limiting plate, which limits the rotation within the base plate; The pressing assembly includes pressing blocks disposed on both sides of the housing, and an inverted L-shaped rod disposed on one side of the pressing block. The inverted L-shaped rod is slidably disposed within the housing, and its bottom extends into the interior of the rotating column. The positioning component includes connecting blocks symmetrically slidably connected inside both sides of the rotating column, a spring fixedly connected to one side of the connecting block, a positioning block set on the other side of the connecting block, a positioning groove opened on one side of the positioning block, a circular groove opened inside the base plate, a rubber strip set on the circular groove, and an extrusion groove opened between the positioning block and the connecting block, with the bottom of the inverted L-shaped rod abutting against the extrusion groove. During testing, place the device on the table, press the pressing block of the pressing component, so that the inverted L-shaped rod squeezes the squeezing groove of the positioning block, pushes the positioning blocks on both sides to move and stretches the spring, and the positioning groove engages with the rubber strip to lock the rotating column, thereby achieving housing positioning; The adsorption component includes an upward pull assembly disposed inside the base plate and an adsorption assembly disposed at the bottom of the base plate. The upward pull assembly includes a movable rod symmetrically disposed at the bottom of the positioning block, sliding columns symmetrically disposed on both sides of the bottom of the movable rod, a sealing sliding groove opened at the bottom of the circular groove, a sealing plate disposed inside the sealing sliding groove, a fixed plate obliquely disposed at the top of the sealing plate, and a sliding hole opened through the fixed plate, with the sliding columns on both sides limited to sliding within the sliding hole. When the positioning block moves toward the rubber strip, it simultaneously drives the moving rod and the sliding column to move, causing the fixed plate to move the sealing plate upward. A negative pressure is formed in the sealing sliding groove, which enhances the adsorption force of the adsorption component on the table. Combined with the positioning structure, the device is stably adsorbed on the smooth table. A limiting block is fixedly connected to the middle of the sealing plate, and the limiting block is slidably disposed in a limiting groove opened on the rotating column; The adsorption assembly includes a communicating cavity opened at the bottom of the sealed sliding groove, and several rubber suction cups disposed at the bottom of the base plate and communicating with the communicating cavity.

2. The high-voltage cable insulation testing device according to claim 1, characterized in that: The positioning block is in the shape of a slight arc, and the spring is fixedly installed inside the rotating column, which is T-shaped as a whole.

3. The high-voltage cable insulation testing device according to claim 2, characterized in that: In the initial state, the bottom of the inverted L-shaped rod abuts against one end of the extrusion groove.

4. The high-voltage cable insulation testing device according to claim 1, characterized in that: The sealing plate is in a sealed sliding connection with the sealing sliding groove and the side wall of the rotating column.

5. The high-voltage cable insulation testing device according to claim 4, characterized in that: The bottom of the rotating column is provided with a support plate for supporting the sealing plate.

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