High-voltage cable terminal tail pipe structure having settlement monitoring function and application method therefor

Abstract

A high-voltage cable terminal tail pipe structure having a settlement monitoring function and an application method therefor. The structure comprises: a first sleeve (1), a second sleeve (2), a cable (5) passing through the first sleeve (1) and the second sleeve (2), and a settlement compensation device (3) connected between the first sleeve (1) and the second sleeve (2), wherein the cable (5) is connected to the second sleeve (2), and the settlement compensation device (3) comprises a main corrugated pipe (31), an upper connecting flange (32) and a lower connecting flange (33), the upper part of the main corrugated pipe (31) being connected to the first sleeve (1) by means of the upper connecting flange (32), and the lower part of the main corrugated pipe (31) being connected to the second sleeve (2) by means of the lower connecting flange (33); and a force displacement sensor (4), which is connected between the upper connecting flange (32) and the lower connecting flange (33).

Description

High-voltage cable terminal tailpipe structure with settlement monitoring function and its application method

[0001] This application claims priority to Chinese Patent Application No. 202411892255.3, filed with the Chinese Patent Office on December 20, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of high-voltage cable accessories technology, such as a high-voltage cable terminal tailpipe structure with settlement monitoring function and its application method. Background Technology

[0003] The newly added power transmission lines are mainly underground cables. At the same time, some existing overhead power transmission lines in cities are also being converted to underground cables. Cables are gradually taking on the role of main power transmission lines, and the power grid's requirements for their power supply reliability are becoming increasingly stringent.

[0004] However, with the increasing number of cable lines and their growing service life, the vast and complex cable network frequently experiences faults, and equipment failures during cable operation have also increased significantly. A large proportion of these equipment failures are due to cracks in the lead seal at the cable termination caused by settlement. Over long-term operation, these cracks gradually widen due to settlement, and simultaneously, seal failure leads to water immersion and corrosion of the metal sheath, resulting in poor grounding of the cable's metal sheath and ultimately causing cable breakdown.

[0005] Chinese Patent Publication No. CN116388106A discloses a high-voltage cable terminal grounding tail pipe structure. Based on a metal corrugated pipe, it achieves a flexible connection between pipes, and its flexibility can compensate for deformations caused by thermal expansion and contraction of the metal pipes. When there is a tendency for relative displacement between the fixed part of the high-voltage power cable terminal grounding tail pipe and the matching cable's metal sheath, the pipe body, based on the flexibility of the metal corrugated pipe, will not suffer mechanical damage within the allowable range of expansion and contraction. It can appropriately lengthen or shorten with the relative displacement of the matching cable's metal sheath, ensuring a stable electrical connection between it and the high-voltage cable's metal sheath. A reliable seal and electrical connection are achieved between the metal cylinder and the cable's metal sheath through a lead-enameled layer formed using a lead-enameling process. However, this technical solution only reduces the impact of relative displacement of the cable's outer sheath through the expansion section, extending the time before cracking at the lead seal position within a certain range. It cannot pre-tighten the seal in advance to prevent displacement from causing cracking, still requiring regular manual inspection. If manual inspection is not timely, cable breakdown can still occur. Summary of the Invention

[0006] This application provides a high-voltage cable terminal tailpipe structure with settlement monitoring function that can provide early warning of the possibility of lead seal cracking and its application method.

[0007] The following technical solution is adopted in this application:

[0008] A high-voltage cable terminal tail pipe structure with settlement monitoring function includes a first sleeve, a second sleeve, a cable passing through the first sleeve and the second sleeve, and a settlement compensation device connected between the first sleeve and the second sleeve, wherein the cable is connected to the second sleeve.

[0009] The settlement compensation device includes a main bellows, an upper connecting flange, and a lower connecting flange. The upper part of the main bellows is connected to the first sleeve through the upper connecting flange, and the lower part of the main bellows is connected to the second sleeve through the lower connecting flange. The high-voltage cable terminal tail pipe structure also includes a force displacement sensor, which is connected between the upper connecting flange and the lower connecting flange.

[0010] In one embodiment, the settlement compensation device further includes a limiting rod, which includes a rod body and a rod head. The size of the rod head is larger than the size of the rod body, and the lower connecting flange is provided with a lower limiting groove to accommodate the rod head.

[0011] In one embodiment, the number of limiting rods is at least two.

[0012] In one embodiment, a plurality of the limiting rods are evenly arranged around the outer circumference of the main bellows.

[0013] In one embodiment, the second sleeve includes a first circular tube section and a second circular tube section connected sequentially from top to bottom. The first circular tube section is disposed on the side near the main corrugated pipe, and the lower part of the second circular tube section is sealed to the cable by lead sealing.

[0014] In one embodiment, the high-voltage cable terminal tail tube structure further includes a resistance testing device, which is electrically connected to the cable and the second circular tube section respectively.

[0015] In one embodiment, the second circular tube portion has a through hole to facilitate the passage of the test leads of the resistance testing device.

[0016] In one embodiment, the high-voltage cable terminal tailpipe structure further includes a controller, which is wirelessly connected to a force displacement sensor.

[0017] This application also provides an application method for a high-voltage cable terminal tailpipe structure with settlement monitoring function, including:

[0018] Determine if the system time is the preset detection time;

[0019] If so, acquire the force and displacement data from the force-displacement sensor; otherwise, wait for the system time to reach the preset detection time before acquiring the force and displacement data from the force-displacement sensor.

[0020] Determine whether either the force data or the displacement data from the force-displacement sensor is zero;

[0021] If so, continue to determine whether the system time is the preset detection time; otherwise, determine whether either the force data or the displacement data of the force displacement sensor exceeds the preset threshold.

[0022] If so, an early warning command will be issued to remind manual intervention; otherwise, the system time will continue to be checked to see if it is the preset detection time.

[0023] This application also provides a computer-readable storage medium storing a computer program or instructions that are programmed or configured to execute, via a processor, the application method of the high-voltage cable terminal tailpipe structure with settlement monitoring function.

[0024] The advantages of this application are:

[0025] This application provides a high-voltage cable terminal tailpipe structure with settlement monitoring function. It utilizes the expansion and contraction deformation of the main corrugated pipe to absorb the force on the lead seal of the tailpipe caused by cable settlement and other reasons. By monitoring the force and displacement sensor on the upper and lower flanges and the settlement distance, it can provide early warning of the possibility of lead seal cracking. Compared with the displacement between the test cable and the cable sheath (or the second sleeve), the displacement data of this application is determined based on the displacement of the settlement compensation device, which makes the data more accurate and reliable, the test more convenient, and can provide feedback on the reliability of the terminal tail seal.

[0026] The application method of this application, by controlling the force that triggers the settlement compensation device, can preemptively trigger the settlement compensation device to compensate before the lead-sealed area reaches the stress threshold for cracking. This allows the settlement compensation device to bear the force on the lead-sealed area, thus preventing cracking due to settlement. If the magnitude of the settlement force or displacement value reaches a certain threshold, a warning will be issued in the background, reminding personnel to check the situation on site promptly. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the high-voltage cable terminal tailpipe structure with settlement monitoring function in this application.

[0028] Figure 2 is a magnified view of point C in Figure 1.

[0029] Figure 3 is a magnified view of part A in Figure 2.

[0030] Figure 4 is a magnified view of part B in Figure 2.

[0031] Figure 5 is a flowchart of the application method of the high-voltage cable terminal tailpipe structure with settlement monitoring function in this application.

[0032] The labels in the diagram represent:

[0033] 1. First sleeve; 2. Second sleeve; 21. First circular tube section; 22. Second circular tube section; 221. Through hole; 3. Settlement compensation device; 31. Main corrugated pipe; 32. Upper connecting flange; 33. Lower connecting flange; 331. Lower limiting groove; 34. Limiting rod; 341. Rod body; 342. Rod head; 4. Force displacement sensor; 5. Cable. Detailed Implementation

[0034] The following will provide a more detailed description of this application. Unless otherwise specified, the instruments or materials used in this application are commercially available.

[0035] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] As shown in Figures 1 to 4, the high-voltage cable terminal tail pipe structure with settlement monitoring function in this embodiment includes a first sleeve 1, a second sleeve 2, a cable 5 passing through the first sleeve 1 and the second sleeve 2, and a settlement compensation device 3 connected between the first sleeve 1 and the second sleeve 2. The cable 5 is connected to the second sleeve 2. The settlement compensation device 3 includes a main corrugated pipe 31, an upper connecting flange 32 and a lower connecting flange 33. The upper part of the main corrugated pipe 31 is connected to the first sleeve 1 through the upper connecting flange 32, and the lower part of the main corrugated pipe 31 is connected to the second sleeve 2 through the lower connecting flange 33. The high-voltage cable terminal tail pipe structure also includes a force displacement sensor 4, which is connected between the upper connecting flange 32 and the lower connecting flange 33. This application utilizes the expansion and contraction deformation of the main corrugated pipe 31 to absorb the force on the tailpipe seal caused by the settlement of the cable 5. By monitoring the force and displacement sensor 4 on the upper connecting flange 32 and the lower connecting flange 33 and the distance of settlement, it can provide early warning of the possibility of seal cracking. Compared with the displacement between the test cable 5 and the cable sheath (or the second sleeve 2), the displacement data of this application is determined based on the displacement of the settlement compensation device, which makes the data more accurate and reliable, the test more convenient, and can provide feedback on the reliability of the terminal tail seal.

[0039] The working principle of the high-voltage cable terminal tailpipe structure with settlement monitoring function in this application is as follows: When cable 5 settles, it pulls on the second sleeve 2. The main corrugated pipe 31 of the settlement compensation device 3 at the upper end of the second sleeve 2 undergoes effective expansion and contraction deformation to absorb the force on the second sleeve 2 caused by the settlement of cable 5, effectively reducing the force of settlement on the second sleeve 2. The force displacement sensor 4 at the settlement compensation device 3 can monitor the magnitude of the force and the settlement distance at that point, providing feedback on the reliability of the terminal tail seal.

[0040] As shown in Figure 3, the settlement compensation device 3 also includes a limiting rod 34. The limiting rod 34 is designed to prevent excessive settlement force at any given moment from exceeding the bearing capacity of the settlement compensation device 3 and to limit the deformation of the main bellows 31. The limiting rod 34 includes a rod body 341 and a rod head 342. The size of the rod head 342 is larger than the size of the rod body 341. The lower connecting flange 33 is provided with a lower limiting groove 331 to accommodate the rod head 342. When the main bellows 31 of the settlement compensation device 3 does not undergo elongation deformation, the rod head 342 is positioned close to the bottom of the lower limiting groove 331. When the main bellows 31 of the settlement compensation device 3 does not undergo elongation deformation, the rod head 342 gradually moves upward.

[0041] In this embodiment, the lower limiting groove 331 is a T-shaped groove, and both ends of the limiting rod 34 are also T-shaped. The upper part of the limiting rod 34 is fixedly connected to the upper connecting flange 32, and the lower part is inserted into the lower limiting groove 331. In other embodiments, the upper connecting flange 32 also has a limiting groove similar to the lower limiting groove 331 to facilitate the installation of the limiting rod 34.

[0042] There are at least two limit rods 34, arranged symmetrically, providing multiple layers of protection.

[0043] Multiple limiting rods 34 are evenly arranged around the outer circumference of the main bellows 31.

[0044] As shown in Figure 2, the second sleeve 2 includes a first circular tube section 21 and a second circular tube section 22 connected sequentially from top to bottom. The first circular tube section 21 is located near the main corrugated pipe 31, and the lower part of the second circular tube section 22 is sealed to the cable 5 by lead sealing. The diameter of the first circular tube section 21 is larger than the diameter of the second circular tube section 22, and the size of the second circular tube section 22 is close to the outside of the cable 5 to facilitate lead sealing.

[0045] In this embodiment, the high-voltage cable terminal tail tube structure also includes a resistance testing device (not shown in the figure), which is electrically connected to the cable 5 and the second circular tube section 22. The resistance testing device of this application utilizes a resistance sensor to measure the resistance between the second circular tube section 22 and the cable's metal sheath, serving as evidence to prove that the lead seal is reliable. When the displacement value measured in this application exceeds a threshold, the test result of the resistance sensor also indicates that the lead seal has cracked. In other embodiments, the resistance testing device may not be provided.

[0046] As shown in Figure 4, in this embodiment, the second circular tube 22 has a through hole 221 to facilitate the passage of the test wires of the resistance testing device.

[0047] In this embodiment, the high-voltage cable terminal tailpipe structure also includes a controller (not shown in the figure), which is wirelessly connected to the force displacement sensor 4. In this embodiment, the components related to signal transmission, such as the signal processor, communication module, or voltage module, are conventional and will not be described in detail here.

[0048] As shown in Figure 5, the application method of the high-voltage cable terminal tailpipe structure with settlement monitoring function in this embodiment includes the following steps:

[0049] A1. Determine if the system time is the preset detection time. If it is, proceed directly to step A2. Otherwise, wait for the system time to be the preset detection time before proceeding to step A2.

[0050] A2. Acquire the force and displacement data of force displacement sensor 4;

[0051] A3. Determine whether any of the force data and displacement data of the force displacement sensor 4 is zero. If it is, proceed to step A1; otherwise, proceed to step A4.

[0052] A4. If either the force data or the displacement data of the force-displacement sensor 4 exceeds a preset threshold, a warning command is issued to remind manual intervention; otherwise, step A1 is executed.

[0053] The working principle of this application method is as follows: By controlling the force on the settling compensation device 3, this application can trigger the settling compensation device 3 in advance to compensate before the lead sealing part reaches the force threshold for cracking. This allows the settling compensation device 3 to bear the force on the lead sealing part, thus avoiding cracking due to settlement. If the magnitude of the settlement force or the displacement value reaches a certain threshold, a warning will be issued in the background, reminding personnel to check the situation on site promptly.

[0054] The computer-readable storage medium of this embodiment stores a computer program or instructions that are programmed or configured to execute, via a processor, an application method for a high-voltage cable terminal tailpipe structure with settlement monitoring function.

[0055] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams. These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

Claims

1. A high-voltage cable terminal tail pipe structure with settlement monitoring function, comprising a first sleeve (1), a second sleeve (2), a cable (5) passing through the first sleeve (1) and the second sleeve (2), and a settlement compensation device (3) connected between the first sleeve (1) and the second sleeve (2), wherein the cable (5) is connected to the second sleeve (2); The settlement compensation device (3) includes a main corrugated pipe (31), an upper connecting flange (32) and a lower connecting flange (33). The upper part of the main corrugated pipe (31) is connected to the first sleeve (1) through the upper connecting flange (32), and the lower part of the main corrugated pipe (31) is connected to the second sleeve (2) through the lower connecting flange (33). The high-voltage cable terminal tail pipe structure also includes a force displacement sensor (4), which is connected between the upper connecting flange (32) and the lower connecting flange (33).

2. The high voltage cable termination tail piece structure according to claim 1, wherein, The settlement compensation device (3) also includes a limiting rod (34), which includes a rod body (341) and a rod head (342). The size of the rod head (342) is larger than the size of the rod body (341). The lower connecting flange (33) is provided with a lower limiting groove (331) to accommodate the rod head (342).

3. The high voltage cable termination tail piece structure according to claim 2, wherein, The number of the limiting rods (34) is at least two.

4. The high voltage cable termination tail piece structure according to claim 3, wherein, Multiple limiting rods (34) are evenly arranged around the outer circumference of the main bellows (31).

5. The high voltage cable termination tail piece structure according to any of claims 1 to 4, wherein, The second sleeve (2) includes a first round tube section (21) and a second round tube section (22) connected sequentially from top to bottom. The first round tube section (21) is located on the side close to the main corrugated pipe (31), and the lower part of the second round tube section (22) and the cable (5) are connected by a lead seal.

6. The high-voltage cable terminal tail tube structure according to claim 5 further includes a resistance testing device, which is electrically connected to the cable (5) and the second round tube (22) respectively.

7. The high voltage cable termination tail piece structure according to claim 6, wherein, The second circular tube (22) has a through hole (221) to facilitate the passage of the test wires of the resistance testing device.

8. The high-voltage cable terminal tail pipe structure according to any one of claims 1 to 4 further includes a controller, the controller being wirelessly connected to the force displacement sensor (4).

9. An application method for a high-voltage cable terminal tailpipe structure with settlement monitoring function, applied to the high-voltage cable terminal tailpipe structure according to any one of claims 1-8, the method comprising: Determine if the system time is the preset detection time; If so, the force data and displacement data of the force displacement sensor (4) are obtained; otherwise, the force data and displacement data of the force displacement sensor (4) are obtained after the system time is the preset detection time. Determine whether any of the force data and displacement data of the force-displacement sensor (4) is zero; If so, continue to determine whether the system time is the preset detection time; otherwise, determine whether either the force data or the displacement data of the force displacement sensor (4) exceeds the preset threshold. If so, an early warning command will be issued to remind manual intervention; otherwise, the system time will continue to be checked to see if it is the preset detection time.

10. A computer readable storage medium having stored therein computer programs or instructions programmed or configured to execute the method of applying the high voltage cable termination bushing structure with settlement monitoring function of claim 9 by a processor.

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