High-voltage cable terminal tail pipe structure with settlement monitoring function and application method thereof

Abstract

The invention discloses a high-voltage cable terminal tail pipe structure with a settlement monitoring function and an application method thereof.According to the structure, telescopic deformation of a main corrugated pipe is used for absorbing acting force generated by cable settlement and other reasons on tail pipe sealing lead, the stress magnitude and the settlement distance of an upper flange and a lower flange are monitored through a force displacement sensor, and the settlement monitoring accuracy is improved. Compared with the displacement between the test cable and the cable sheath (or the second sleeve), the test is more convenient, and the sealing reliability of the tail part of the terminal can be fed back. According to the application method disclosed by the invention, if the size of the settlement force or the displacement value reaches a certain threshold value, early warning is carried out at the background, and personnel are reminded to check the site condition in time.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cable accessories, and in particular to a high-voltage cable terminal tail pipe structure with a settlement monitoring function and an application method thereof. Background Art

[0002] The newly added transmission lines are mainly based on underground cable laying. At the same time, some of the original overhead line transmission methods in the city have also been transformed into underground cable transmission. Cables are gradually taking on the role of trunk transmission lines, and the power grid has increasingly strong requirements for its power supply reliability.

[0003] However, with the increasing number of cable lines and the increase in the number of years of operation, the large and complex cable network often fails, and the equipment failures in cable operation have also increased significantly. Among these equipment failures, a large part is due to the cracking of the lead seal at the tail of the terminal due to the effect of settlement. Under long-term operation, the crack position gradually expands due to the settlement. At the same time, the failure of the seal causes the metal sheath to be soaked in water and corroded, resulting in poor grounding of the cable metal sheath, and finally causing cable breakdown events.

[0004] Chinese patent publication number CN116388106A discloses a high-voltage cable terminal grounding tail pipe structure, which realizes the telescopic docking between pipes based on metal bellows, and its telescopicity can play a certain role in compensating for the deformation of metal pipes such as thermal expansion and contraction. When there is a tendency for relative displacement between the fixed part of the high-voltage power cable terminal grounding tail pipe and the metal sheath of the supporting cable, the pipe body part will not be mechanically damaged within the allowable telescopic range based on the telescopicity of the metal bellows, and can be appropriately extended or shortened with the relative displacement of the metal sheath of the supporting cable, ensuring a stable electrical connection between it and the metal sheath of the high-voltage cable. The lead-plated layer formed by the lead-plating process between the metal cylinder and the metal sheath of the cable realizes reliable sealing and electrical connection. However, this technical solution only reduces the influence of the relative displacement of the outer sheath of the cable through the telescopic section, prolongs the time of cracking of the lead sealing position within a certain range, and cannot pre-tighten whether the displacement may cause cracking of the lead sealing position. Manual regular inspection is still required. If the manual inspection is not timely, it will still cause cable breakdown events. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-voltage cable terminal tail pipe structure with a settlement monitoring function and an application method thereof, which can provide an early warning of the possibility of lead sealing cracking.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A high-voltage cable terminal tail pipe structure with a settlement monitoring function comprises a first casing, a second casing, a cable running through the first casing and the second casing, and a settlement compensation device connected between the first casing and the second casing, wherein the cable is connected to the second casing, and the settlement compensation device comprises a main bellows, an upper connecting flange and a lower connecting flange, wherein the upper portion of the main bellows is connected to the first casing via the upper connecting flange, and the lower portion of the main bellows is connected to the second casing via the lower connecting flange, and the high-voltage cable terminal tail pipe structure further comprises a force displacement sensor, wherein the force displacement sensor is connected between the upper connecting flange and the lower connecting flange.

[0008] As a further improvement of the above technical solution:

[0009] The settlement compensation device also includes a limiting rod, which includes a rod body and a rod head. The size of the rod head is larger than that of the rod body. The lower connecting flange is provided with a lower limiting groove for accommodating the rod head.

[0010] The number of the limiting rods is at least two.

[0011] A plurality of the limiting rods are evenly arranged around the outer circumference of the main bellows.

[0012] The second sleeve includes a first circular tube portion and a second circular tube portion which are sequentially connected from top to bottom. The first circular tube portion is arranged close to one side of the main corrugated tube, and the lower portion of the second circular tube portion is sealed to the cable by a lead seal.

[0013] The high-voltage cable terminal tail tube structure further comprises a resistance testing device, and the resistance testing device is electrically connected to the cable and the second round tube portion respectively.

[0014] The second circular tube portion is provided with a through hole for the test wire of the resistance test device to pass through.

[0015] The high-voltage cable terminal tail pipe structure also includes a controller, and the controller is wirelessly connected to the force displacement sensor.

[0016] As a general inventive concept, the present invention also provides an application method of a high-voltage cable terminal tail pipe structure with a settlement monitoring function, comprising the following steps:

[0017] A1. Determine whether the system time is the preset detection time. If so, directly execute step A2. Otherwise, wait until the system time is the preset detection time and then execute step A2.

[0018] A2. Obtain force data and displacement data of the force displacement sensor;

[0019] A3, determining whether any one of the force data and the displacement data of the force displacement sensor is zero, if yes, executing step A1, otherwise executing step A4;

[0020] A4. Determine whether any of the force data and displacement data of the force displacement sensor exceeds a preset threshold. If so, issue a warning instruction to remind manual processing; otherwise, execute step A1.

[0021] As a general inventive concept, the present invention also provides a computer-readable storage medium, which stores a computer program or instruction, and the computer program or instruction is programmed or configured to execute the application method of the high-voltage cable terminal tail pipe structure with settlement monitoring function through a processor.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] The present invention discloses a high-voltage cable terminal tail pipe structure with a settlement monitoring function. The structure utilizes the expansion and contraction deformation of a main bellows to absorb the force on the tail pipe seal caused by cable settlement and the like. The force magnitude and settlement distance of the upper and lower flanges are monitored by a force displacement sensor, so that the possibility of seal cracking can be warned in advance. Compared with the displacement between the test cable and the cable sheath (or the second sheath), the displacement data of the present invention is determined based on the displacement of a settlement compensation device. The data is more real and reliable, the test is more convenient, and the reliability of the terminal tail seal can be fed back.

[0024] The application method of the present invention can trigger the settlement compensation device to compensate in advance when the lead sealing part has not reached the stress threshold of cracking by controlling the force that triggers the settlement compensation device, so that the force on the lead sealing part is borne by the settlement compensation device, thereby avoiding the problem of cracking of the lead sealing part due to settlement. If the magnitude of the settlement force or the displacement value reaches a certain threshold, an early warning will be issued in the background to remind personnel to check the situation on site in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 yes Figure 1 A partial enlarged view of point C in the middle.

[0027] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0028] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle.

[0029] Figure 5 It is a flow chart of the application method of the present invention.

[0030] The symbols in the figure represent:

[0031] 1. First sleeve; 2. Second sleeve; 21. First round tube portion; 22. Second round tube portion; 221. Through hole; 3. Settlement compensation device; 31. Main bellows; 32. Upper connecting flange; 33. Lower connecting flange; 331. Lower limit groove; 34. Limit rod; 341. Rod body; 342. Rod head; 4. Force displacement sensor; 5. Cable. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0033] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply 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 a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figures 1 to 4As shown, the high-voltage cable terminal tail pipe structure with a settlement monitoring function of this embodiment includes a first bushing 1, a second bushing 2, a cable 5 running through the first bushing 1 and the second bushing 2, and a settlement compensation device 3 connected between the first bushing 1 and the second bushing 2, the cable 5 is connected to the second bushing 2, the settlement compensation device 3 includes a main bellows 31, an upper connecting flange 32 and a lower connecting flange 33, the upper part of the main bellows 31 is connected to the first bushing 1 through the upper connecting flange 32, and the lower part of the main bellows 31 is connected to the second bushing 2 through the lower connecting flange 33, and 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. The present invention utilizes the expansion and contraction deformation of the main bellows 31 to absorb the force on the tail pipe seal caused by the settlement of the cable 5 and the like. The force displacement sensor 4 monitors the force magnitude and settlement distance of the upper connecting flange 32 and the lower connecting flange 33, and can give early warning of the possibility of cracking of the seal. Compared with the displacement between the testing cable 5 and the cable sheath (or the second sleeve 2), the displacement data of the present invention is determined according to the displacement of the settlement compensation device. The data is more real and reliable, the test is more convenient, and the reliability of the terminal tail seal can be fed back.

[0037] The working principle of the present invention is as follows: when the cable 5 sinks, the second sleeve 2 is pulled, and the main bellows 31 of the settlement compensation device 3 at the upper end of the second sleeve 2 is effectively stretched and deformed to absorb the force on the second sleeve 2 caused by the settlement of the cable 5, effectively reducing the force of the settlement on the second sleeve 2. The force displacement sensor 4 at the settlement compensation device 3 can monitor the force magnitude and settlement distance at this location, and provide feedback on the reliability of the terminal tail seal.

[0038] like Figure 3 As shown, the settlement compensation device 3 further includes a limit rod 34, which is used to prevent the settlement force at a certain moment from being too large and exceeding the bearing capacity of the settlement compensation device 3, and to limit the deformation of the main bellows 31. The limit 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, and a lower limit groove 331 for accommodating the rod head 342 is provided on the lower connecting flange 33. When the main bellows 31 of the settlement compensation device 3 does not undergo elongation and deformation, the rod head 342 is arranged close to one side of the bottom of the lower limit groove 331, and when the main bellows 31 of the settlement compensation device 3 does not undergo elongation and deformation, the rod head 342 gradually moves upward.

[0039] In this embodiment, the lower limit groove 331 is a T-shaped groove, and the two ends of the limit rod 34 are also T-shaped. The upper part of the limit rod 34 is fixedly connected to the upper connecting flange 32, and the lower part is inserted into the lower limit groove 331. In other embodiments, the upper connecting flange 32 is also provided with a limit groove similar to the lower limit groove 331 to facilitate the installation of the limit rod 34.

[0040] There are at least two limiting rods 34 , which are symmetrically arranged to provide multiple protections.

[0041] A plurality of limiting rods 34 are evenly arranged around the outer circumference of the main bellows 31 .

[0042] like Figure 2 As shown, the second sleeve 2 includes a first circular tube portion 21 and a second circular tube portion 22 which are sequentially connected from top to bottom. The first circular tube portion 21 is arranged close to one side of the main corrugated tube 31, and the lower part of the second circular tube portion 22 is connected to the cable 5 by a lead seal. The diameter of the first circular tube portion 21 is larger than the diameter of the second circular tube portion 22, and the size of the second circular tube portion 22 is close to the outside of the cable 5, so as to facilitate the lead seal.

[0043] 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 round tube portion 22 respectively. The resistance testing device of the present invention uses a resistance sensor to measure the resistance effect between the second round tube portion 22 and the cable metal sheath as a proof to prove that the lead seal is reliable. When the displacement value measured by the present invention is greater than the threshold value, the test result of the resistance sensor also shows that the lead seal has cracked. In other embodiments, the resistance testing device may not be provided.

[0044] like Figure 4 As shown, in this embodiment, the second circular tube portion 22 is provided with a through hole 221 for the test line of the resistance test device to pass through.

[0045] In this embodiment, the high-voltage cable terminal tail pipe structure further includes a controller (not shown in the figure), which is wirelessly connected to the force displacement sensor 4. In this embodiment, parts related to signal transmission, such as a signal processor, a communication module or a voltage module are conventional and will not be described in detail here.

[0046] like Figure 5 As shown, the application method of the high-voltage cable terminal tail pipe structure with a settlement monitoring function of this embodiment includes the following steps:

[0047] A1. Determine whether the system time is the preset detection time. If so, directly execute step A2. Otherwise, wait until the system time is the preset detection time and then execute step A2.

[0048] A2, obtaining force data and displacement data of the force displacement sensor 4;

[0049] A3, judging whether any one of the force data and the displacement data of the force displacement sensor 4 is zero, if yes, executing step A1, otherwise executing step A4;

[0050] A4. Determine whether any of the force data and displacement data of the force displacement sensor 4 exceeds a preset threshold. If yes, issue an early warning instruction to remind manual processing; otherwise, execute step A1.

[0051] The working principle of the application method of the present invention is: the present invention can trigger the settlement compensation device 3 to compensate in advance when the lead sealing part has not reached the force threshold for cracking by controlling the force that triggers the settlement compensation device 3, so that the force on the lead sealing part is borne by the settlement compensation device 3, thereby avoiding the problem of cracking of the lead sealing part due to settlement. If the size of the settlement force or the displacement value reaches a certain threshold, an early warning will be issued in the background to remind personnel to check the situation on site in time.

[0052] The computer-readable storage medium of this embodiment stores a computer program or instruction, and the computer program or instruction is programmed or configured to execute an application method of a high-voltage cable terminal tail pipe structure with a settlement monitoring function through a processor.

[0053] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented 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. The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0054] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage cable terminal tail tube structure with a settlement monitoring function, comprising a first bushing (1), a second bushing (2), a cable (5) passing through the first bushing (1) and the second bushing (2), and a settlement compensation device (3) connected between the first bushing (1) and the second bushing (2), wherein the cable (5) is connected to the second bushing (2), and is characterized in that: The settlement compensation device (3) comprises a main bellows (31), an upper connecting flange (32) and a lower connecting flange (33); the upper portion of the main bellows (31) is connected to the first bushing (1) via the upper connecting flange (32); the lower portion of the main bellows (31) is connected to the second bushing (2) via the lower connecting flange (33); the high-voltage cable terminal tail pipe structure further comprises a force displacement sensor (4); the force displacement sensor (4) is connected between the upper connecting flange (32) and the lower connecting flange (33).

2. The high voltage cable terminal tail tube structure according to claim 1, characterized in that: The settlement compensation device (3) further comprises a limiting rod (34), wherein the limiting rod (34) comprises a rod body (341) and a rod head (342), wherein the size of the rod head (342) is larger than the size of the rod body (341), and the lower connecting flange (33) is provided with a lower limiting groove (331) for accommodating the rod head (342).

3. The high voltage cable terminal tail tube structure according to claim 2, characterized in that: The number of the limiting rods (34) is at least two.

4. The high voltage cable terminal tail tube structure according to claim 3, characterized in that: The plurality of limit rods (34) are evenly arranged around the outer circumference of the main bellows (31).

5. The high voltage cable terminal tail tube structure according to any one of claims 1 to 4, characterized in that: The second sleeve (2) comprises a first circular tube portion (21) and a second circular tube portion (22) which are connected in sequence from top to bottom, the first circular tube portion (21) being arranged close to one side of the main corrugated tube (31), and the lower part of the second circular tube portion (22) and the cable (5) being sealed by a lead seal.

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

7. The high voltage cable terminal tail pipe structure according to claim 6, characterized in that: The second circular tube portion (22) is provided with a through hole (221) for facilitating the passage of a test line of a resistance testing device.

8. The high voltage cable terminal tail tube structure according to any one of claims 1 to 4, characterized in that: The high-voltage cable terminal tail pipe structure also includes a controller, and the controller is wirelessly connected to the force displacement sensor (4).

9. An application method of a high-voltage cable terminal tail pipe structure with a settlement monitoring function according to any one of claims 1 to 8, characterized in that: The following steps are involved: A1. Determine whether the system time is the preset detection time. If so, directly execute step A2. Otherwise, wait until the system time is the preset detection time and then execute step A2. A2, obtaining force data and displacement data of the force displacement sensor (4); A3, determining whether any one of the force data and the displacement data of the force displacement sensor (4) is zero, if yes, executing step A1, otherwise executing step A4; A4. Determine whether any one of the force data and the displacement data of the force displacement sensor (4) exceeds a preset threshold value. If so, issue a warning instruction to remind manual processing; otherwise, execute step A1.

10. A computer-readable storage medium having a computer program or instruction stored therein, characterized in that: The computer program or instruction is programmed or configured to execute the application method of the high-voltage cable terminal tail pipe structure with settlement monitoring function as claimed in claim 9 through a processor.

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