Device for measuring insulation diameter of high-voltage cable

Abstract

The invention discloses a device for measuring the insulation diameter of a high-voltage cable, and the device comprises a pair of clamps which are oppositely disposed and are used for clamping a to-be-measured high-voltage cable; the clamp comprises a side wall and a pair of clamping blocks mounted on the side wall, and the clamping blocks clamp a high-voltage cable to be tested therebetween; the sliding rails are arranged between the two clamps; the laser measurement module is connected to the sliding rail in a sliding manner; the laser measuring module is provided with at least two laser distance measuring sensors which are arranged diagonally and used for measuring the insulation diameter of the high-voltage cable to be measured. According to the invention, non-contact measurement can be carried out on the insulation surface of the cable, and the insulation diameter of the cable and the tiny deviation in the X-axis direction and the Y-axis direction can be efficiently, accurately and non-destructively measured; the laser ranging principle is applied, the cable insulation diameter measurement accuracy is improved in cable accessory installation, and an efficient, reliable, accurate and damage-free measurement tool is provided; tiny scratches possibly caused by measurement of a traditional vernier caliper are avoided, and the operation reliability of a cable system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, and in particular to a device for measuring the insulation diameter of a high-voltage cable. Background Art

[0002] As a key link in the power transmission system, high-voltage cables play a vital role in the stable and safe operation of the power grid. The insulation performance of high-voltage cables is directly related to the reliability of power transmission, and the quality of the insulation layer, insulation diameter and its adaptability to the stress cone are the key factors affecting the insulation performance.

[0003] In practical applications, in order to reduce the induced voltage and circulating current of the metal sheath, and considering factors such as production process and transportation convenience, high-voltage cables often need to be segmented. The segmented cables need to be connected through joints to restore their electrical performance, thereby achieving the requirements of long-distance power transmission. In the installation process of joint accessories, the grinding of the cable insulation layer and the accurate measurement of the outer diameter of the insulation are crucial. This process directly determines the fit between the stress cone and the insulation layer, which in turn affects the insulation performance of the joint and the stability of the entire cable system.

[0004] At present, the measurement of the outer diameter of insulation mainly relies on vernier calipers. However, this traditional measurement method has obvious limitations. During the operation, it is necessary to measure and obtain values ​​along the "XY" axis of the outer diameter of the insulation multiple times, which is not only easy to introduce human operation errors, but also leads to accuracy deviations due to the subjectivity of the readings. In addition, the contact measurement between the caliper and the surface of the insulation layer may leave marks on the surface of the insulation layer. Once this happens, the insulation layer often needs to be polished a second time, which increases the construction process and potential risks. On the one hand, the accumulation of errors during multiple measurements and readings may cause deviations in the final insulation outer diameter measurement results, thereby affecting the selection and installation accuracy of the stress cone; on the other hand, if the caliper marks are not properly handled after the measurement, these tiny surface defects may become the starting point of local electric field concentration during long-term operation, gradually reducing the insulation performance of the insulation layer, and even causing serious faults such as insulation breakdown, threatening the safe operation of the entire power system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a device for measuring the insulation diameter of a high-voltage cable, so as to measure the insulation diameter of the high-voltage cable accurately, efficiently and non-destructively.

[0006] In order to solve the above technical problems, the present invention provides a device for measuring the insulation diameter of a high-voltage cable, comprising:

[0007] A pair of clamps arranged opposite to each other, used for clamping the high-voltage cable to be tested; the clamps include side walls and a pair of clamping blocks installed on the side walls, the clamping blocks clamp the high-voltage cable to be tested therebetween;

[0008] A plurality of slide rails disposed between the two clamps;

[0009] A laser measuring module is slidably connected to the slide rail; the laser measuring module is provided with at least two laser distance measuring sensors arranged diagonally, and is used for measuring the insulation diameter of the high-voltage cable to be measured.

[0010] Preferably, the two clamping blocks are symmetrically mounted on the side wall, and opposite sides of the two clamping blocks are provided with V-shaped clamping openings to clamp the high-voltage cable to be tested therebetween.

[0011] Preferably, the outer sides of the two clamping blocks are connected with screw rods, and the screw rods are installed on the side walls.

[0012] Preferably, the upper and lower sides of the side wall are parallel, and the left and right sides are in an outwardly convex arc shape.

[0013] Preferably, the clamp further comprises a guide rail bracket mounted on the top of the clamp block, a guide rail clamped on the guide rail bracket, and a first linear motion bearing is provided between the guide rail and the guide rail bracket for enabling the clamp block to perform relative linear motion on the guide rail.

[0014] Preferably, guide rail seats are installed at both ends of the guide rail, a guide rail fixing ring is arranged inside the guide rail seat, and the end of the guide rail is locked in the guide rail seat by the guide rail fixing ring.

[0015] Preferably, a ruler is installed on the side wall above the clamping block, a length scale is provided on the ruler, and a pointer is installed on the side of the clamping block facing the ruler.

[0016] Preferably, the laser measurement module is in a circular ring shape, and its ring body includes a surrounding plate and a side plate, and the side plate is assembled with the surrounding plate through a connecting frame.

[0017] Preferably, there are 6 laser ranging sensors in total, which are equally spaced on the side plate at a central angle of 60°.

[0018] Preferably, the side plate is further provided with a plurality of second linear motion bearings for sleeve-mounting the slide rail therein, so that the laser measurement module performs linear motion on the slide rail.

[0019] The implementation of the present invention has the following beneficial effects: the present invention can perform non-contact measurement on the surface of cable insulation, and can efficiently, accurately and non-destructively measure the cable insulation diameter and its minute deviations in the X- and Y-axis directions; the laser ranging principle is applied to improve the accuracy of cable insulation diameter measurement in the installation of cable accessories, and provide an efficient, reliable, accurate and non-destructive measuring tool; it avoids the minute scratches that may be caused by traditional vernier caliper measurement, and improves the operational reliability of the cable system; it enables installers to measure the insulation diameter of polished high-voltage cables more efficiently and accurately, reduces personnel reading errors, effectively avoids the potential risk of damage to the insulation layer by traditional measuring tools, saves working time, and increases work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a device for measuring the insulation diameter of a high-voltage cable according to an embodiment of the present invention.

[0022] Figure 2 The present invention is a schematic diagram of a three-dimensional exploded structure of a device for measuring the insulation diameter of a high-voltage cable according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the structure of the clamp in the embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the structure of the laser measurement module in the embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following descriptions of the embodiments are with reference to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. In the description of the present invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0026] Please also refer to Figure 1-4 As shown, an embodiment of the present invention provides a device for measuring the insulation diameter of a high-voltage cable, comprising:

[0027] A pair of clamps 1 arranged opposite to each other are used to clamp the high-voltage cable to be tested; the clamp 1 comprises a side wall 10 and a pair of clamping blocks 11 mounted on the side wall 10, and the clamping blocks 11 clamp the high-voltage cable to be tested therebetween;

[0028] A plurality of slide rails 3 arranged between the two clamps 1;

[0029] A laser measuring module 2 is slidably connected to the slide rail 3; the laser measuring module 2 has at least two diagonally arranged laser distance measuring sensors 201 for measuring the insulation diameter of the high-voltage cable to be measured.

[0030] Specifically, in the embodiment of the present invention, the two clamps 1 have the same structure and are symmetrically arranged at both ends of the slide rail 3. The upper and lower sides of the side wall 10 of the clamp 1 are parallel, and the left and right sides are convex arc-shaped. The two clamps 11 are symmetrically installed on the side wall 10, and the opposite sides of the two clamps 11 are provided with V-shaped clamping openings to clamp the high-voltage cable to be tested therebetween. The outer sides of the two clamps 11 are connected with screws 12 through screw connecting plates 121, and the screws 12 are installed on the side wall 10 through screw fixing seats 122.

[0031] A guide rail bracket 111 is also installed on the top of the clamp block 11, and the guide rail 13 is clamped on the guide rail bracket 11. A first linear motion bearing 112 is provided between the guide rail 13 and the guide rail bracket 11, so that the clamp block 11 can perform relative linear motion on the guide rail 13. Guide rail seats 131 are installed at both ends of the guide rail 13, and a guide rail fixing ring 132 is provided in the guide rail seat 131. The end of the guide rail 13 is locked in the guide rail seat 131 by the guide rail fixing ring 132.

[0032] A ruler 14 is installed on the side wall 10 above the clamping block 11, and a length scale is set on the ruler 14. A pointer 15 is installed on the side of the clamping block 11 facing the ruler 14. When the screw 12 is rotated to push the clamping block 11 to move, the position of the clamping block 11 can be known according to the scale of the ruler 14 indicated by the pointer 15, and the position of the clamping block 11 can be adjusted by the screw 12 when necessary to ensure that the movement distance of the two clamping blocks 11 when clamping the high-voltage cable is equal, so that the high-voltage cable is in the center position.

[0033] In the embodiment of the present invention, the laser measurement module 2 is in the shape of a ring, and its ring body includes a surrounding plate 212 and a side plate 213, and the side plate 213 is assembled with the surrounding plate 212 through a connecting frame 211. A plurality of laser ranging sensors 201 are evenly spaced on the side plate 213 through a mounting bracket 202, wherein every two laser ranging sensors 201 are arranged diagonally, that is, the laser optical paths of the two coincide with the diameter of the ring body. As an example, there are a total of 6 laser ranging sensors 201 in this embodiment, which are evenly spaced on the side plate 213 at a central angle of 60°. A plurality of second linear motion bearings 22 are also provided on the side plate 213, which are used to sleeve the slide rail 3 therein, so that the laser measurement module 2 can perform linear motion on the slide rail 3.

[0034] The laser measurement module 2 also has a button 23 and a display screen 24 for operating the laser measurement module 2 to start or stop measurement.

[0035] The working principle and process of the device for measuring the insulation diameter of a high-voltage cable according to an embodiment of the present invention are described as follows:

[0036] The polished cable is inserted into the measuring device of the embodiment of the present invention, and the screws 12 at both ends of the device are adjusted clockwise to drive the clamping block 11 to move relatively, so that the cable is clamped and fixed in the center, and the center point is marked as O.

[0037] Turn on the power of the laser measurement module 2, slide the laser measurement module 2 on the slide rail 3 to the position to be measured, and long press the confirmation button to start the measurement. Six laser distance measuring sensors 201 (labeled as A, B, C, D, E, and F) distributed at equal intervals along the circumference at a central angle of 60° start measuring at the same time. - The laser distance measuring sensor 201 will emit laser to the cable insulation surface and measure the distance from itself to the cable insulation surface. For example, the distance from the laser distance measuring sensor A to the cable insulation surface is A A1, the distance from the laser distance measuring sensor B to the cable insulation surface is BB1, and so on. The distance from the laser distance measuring sensor D to the cable insulation surface is DD1.

[0038] Taking laser distance sensor A as an example, the radius R(a) is calculated as follows: R(a)=AO-AA1, where AO is the distance from the location of laser A to the center point O (this is a fixed value determined by the structure of the fixture), and AA1 is the distance from laser distance sensor A to the insulation surface of the cable. Similarly, for laser distance sensor D, the radius R(d)=DO-DD1.

[0039] When calculating the cable insulation diameter, the data measured by two diagonal lasers are used. For example, to calculate the diameter D(A1-D1), the two radii of the diagonal are added, that is, D(A1-D1)=R(a)+R(d). The same is true for the diagonal diameters measured by the other two groups of laser ranging sensors (B and E, C and F). In this way, the diameter of the cable insulation can be accurately measured, and then the measurement results are matched with the stress cone size to ensure the accuracy and adaptability of the installation of high-voltage cable accessories. It can be understood that the cable after grinding is in the shape of a right cylinder, and the cable insulation diameter should be compatible with the stress cone to meet the clamping force requirements between the outer diameter of the cable insulation and the stress cone. The clamping force refers to the tightness between the stress cone and the outer diameter of the cable insulation. It reflects whether the stress cone can effectively disperse the electric field stress in the cable terminal or joint to prevent the occurrence of partial discharge and breakdown.

[0040] When you need to measure multiple points, slide the laser measurement module 2 left and right again to the position you need to measure. After the measurement is completed, short press the confirmation key to stop the measurement and save the data. After the measurement is completed, long press the confirmation key to stop the measurement, and turn off the power button to end the measurement. Then rotate the screw 12 counterclockwise, loosen the clamp 11 and withdraw the cable. It should be noted that the measuring device of the embodiment of the present invention can meet the currently commonly used wire core section of 800mm 2 -2500mm 2 Insulation diameter measurement of XLPE high voltage cables.

[0041] It can be seen from the above description that compared with the prior art, the beneficial effects brought about by the embodiments of the present invention are: the present invention can perform non-contact measurement on the cable insulation surface, and can efficiently, accurately and non-destructively measure the cable insulation diameter and its slight deviations in the X and Y axis directions; the application of the laser ranging principle improves the accuracy of cable insulation diameter measurement in cable accessory installation, and provides an efficient, reliable, accurate and non-destructive measuring tool; avoids the tiny scratches that may be caused by traditional vernier caliper measurement, and improves the operational reliability of the cable system; enables installers to measure the insulation diameter of high-voltage cables after polishing more efficiently and accurately, reduces personnel reading errors, effectively avoids the potential risk of damage to the insulation layer by traditional measuring tools, saves working time, and increases work efficiency.

[0042] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A device for measuring the insulation diameter of a high-voltage cable, characterized in that: include: A pair of clamps arranged opposite to each other, used for clamping the high-voltage cable to be tested; the clamps include side walls and a pair of clamping blocks installed on the side walls, the clamping blocks clamp the high-voltage cable to be tested therebetween; A plurality of slide rails disposed between the two clamps; A laser measuring module is slidably connected to the slide rail; the laser measuring module is provided with at least two laser distance measuring sensors arranged diagonally, and is used for measuring the insulation diameter of the high-voltage cable to be measured.

2. The measuring device according to claim 1, characterized in that The two clamping blocks are symmetrically mounted on the side wall, and opposite sides of the two clamping blocks are provided with V-shaped clamping openings to clamp the high-voltage cable to be tested therebetween.

3. The measuring device according to claim 2, characterized in that The outer sides of the two clamping blocks are connected with screw rods, and the screw rods are installed on the side walls.

4. The measuring device according to claim 1, characterized in that The upper and lower sides of the side wall are parallel, and the left and right sides are in an outwardly convex arc shape.

5. The measuring device according to claim 1, characterized in that The clamp also includes a guide rail bracket installed on the top of the clamp block, a guide rail clamped on the guide rail bracket, and a first linear motion bearing is provided between the guide rail and the guide rail bracket for making the clamp block perform relative linear motion on the guide rail.

6. The measuring device according to claim 5, characterized in that Guide rail seats are installed at both ends of the guide rail, and guide rail fixing rings are arranged in the guide rail seats. The ends of the guide rails are locked in the guide rail seats by the guide rail fixing rings.

7. The measuring device according to claim 2, characterized in that A ruler is installed on the side wall above the clamping block, a length scale is arranged on the ruler, and a pointer is installed on the side of the clamping block facing the ruler.

8. The measuring device according to claim 1, characterized in that The laser measurement module is in a circular ring shape, and its ring body includes a surrounding plate and a side plate, and the side plate is assembled with the surrounding plate through a connecting frame.

9. The measuring device according to claim 8, characterized in that There are 6 laser distance measuring sensors in total, which are evenly distributed on the side plate at a central angle of 60°.

10. The measuring device according to claim 8, characterized in that The side plate is also provided with a plurality of second linear motion bearings for sleeve-mounting the slide rail therein so that the laser measurement module can perform linear motion on the slide rail.

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