A cold-resistant medium-voltage power cable

Abstract

This invention relates to a cold-resistant medium-voltage power cable for use in the cable industry. It includes a cable body with a bending protective sleeve slidably fitted at the outer end. The combination of the bending protective sleeve, chuck, flexible heating pad, and bending sensing component reduces the difficulty of bending the cable body during installation, preventing damage due to excessive bending and improving the efficiency and safety of cable installation in cold regions. Furthermore, it heats the bending area, increasing the cable's flexibility during installation, reducing damage to the internal core, and providing insulation protection for the bending area during continued use. This reduces the impact of low temperatures on the bending point, lowering the risk of hardening or cracking, and improving the cable's durability after installation. Ultimately, this ensures the safety and stability of the cable during power transmission.

Description

Technical Field

[0001] The invention relates to a cold-resistant medium-voltage power cable, in particular to a cold-resistant medium-voltage power cable used in the cable field. Background Art

[0002] Medium voltage power cables usually refer to cables with rated voltages ranging from 6kV to 35kV. They are widely used in distribution networks, industrial installations, and other areas that require large-capacity electricity. The basic structure of medium voltage power cables includes core, insulation layer, shielding layer, and protective layer. Among them, the core is the core part of the cable, responsible for transmitting electrical energy; the insulation layer is used to isolate the electrical connection between the live parts and the outside world to ensure the safe operation of the cable; the shielding layer and protective layer play a protective role to prevent external factors from damaging the cable.

[0003] Due to the material properties of medium-voltage power cables, when they are laid and used in cold areas, the flexibility and electrical properties of their insulation layers, shielding layers and protective layers will be reduced, causing the medium-voltage power cables to harden or crack, which is not conducive to the application of medium-voltage power cables in cold areas.

[0004] Although some low-temperature-resistant materials have been used in medium-voltage power cables in the prior art, low temperatures will still affect their flexibility, especially in the bending positions where the medium-voltage cables are laid. They are easily damaged under the dual effects of low temperatures and bending pressure, which reduces the durability of the medium-voltage power cables and their safety during power transmission. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to increase the durability of the bending position of the medium voltage power cable when it is used in cold areas.

[0006] In order to solve the above problems, the present invention provides a cold-resistant medium-voltage power cable, comprising a cable body, a bending protective sleeve is slidably sleeved on the outer end of the cable body, chucks are bolted to the left and right ends of the bending protective sleeve, and the chucks are slidably matched with the cable body, an adjustment protection cavity is opened in the bending protective sleeve, a flexible electric heating patch is fixedly connected to the inner wall of the adjusting protection cavity away from the cable body, and a bending induction component matched with the flexible electric heating patch is arranged between the left and right inner walls of the adjusting protection cavity;

[0007] The bending sensing component includes a trigger pad fixedly connected to the left and right inner walls of the adjusting protection cavity, an inner telescopic induction coil is fixedly connected to the right end of the left trigger pad, an outer telescopic induction coil is fixedly connected to the left end of the right trigger pad, and the outer telescopic induction coil is located on the outside of the inner telescopic induction coil, an inner sensing contact block is fixedly connected to the right end of the inner telescopic induction coil, an outer sensing contact block matching the inner sensing contact block is fixedly connected to the left end of the outer telescopic induction coil, and the flexible electric heating patch is connected to the inner sensing contact block and the outer sensing contact block through a wire.

[0008] In the above-mentioned cold-resistant medium-voltage power cable, not only can the bending difficulty of the cable body during laying be reduced and damage to the cable body caused by excessive bending be avoided, but also the bending laying position of the cable body can be insulated during the subsequent continuous use of the cable body, thereby reducing the degree to which the bending part is affected by low temperature, reducing the risk of hardening or even cracking, and ensuring the safety and stability of the cable body during power transmission.

[0009] As a further improvement of the present application, a microcontroller is also fixedly connected to the left side of the rear end of the bending protection sleeve, and a bending protection subsystem matched with the cable maintenance platform is mounted in the microcontroller. The bending protection subsystem includes a bending protection processing unit, and the input end of the bending protection processing unit is connected to the cable parameter collection unit and the bending sensing collection unit, and the output end of the bending protection processing unit is connected to the thermal insulation protection unit and the abnormal alarm unit;

[0010] The input end of the cable parameter collection unit is connected to the cable maintenance platform signal through a wireless signal transmitter, the input end of the bending sensing collection unit is connected to the inner sensing contact block and the outer sensing contact block signal, the output end of the thermal insulation protection unit is connected to the flexible electric heating patch signal, and the output end of the abnormal alarm unit is connected to the cable maintenance platform signal through a wireless signal transmitter.

[0011] As a further improvement and supplement to the present application, a power interface and a solar charging structure are respectively provided at the rear end of the microcontroller, and the power interface and the solar charging structure are connected to the microcontroller through independent lines.

[0012] As a further improvement of the present application, both front and rear ends of the chuck are fixedly connected with support ears, and mounting holes are provided on the support ears. The output end of the abnormal alarm unit is also connected to the alarm light signal installed on the support ears.

[0013] As a further improvement of the present application, the regulating protection cavity is filled with inert protective gas, a pressure regulating interface connected to the regulating protection cavity is fixedly connected to the right side of the rear end of the bending protection sleeve, and the output end of the bending protection processing unit is also connected to an internal stress release unit, and the output end of the internal stress release unit is connected to the electric control valve signal arranged on the pressure regulating interface.

[0014] As a further improvement and supplement of the present application, the input end of the bending protection processing unit is also connected to a pressure collection unit, and the input end of the pressure collection unit is connected to the pressure probe signal arranged in the regulating protection cavity.

[0015] As another improvement of the present application, the input end of the bending protection unit is also connected to a temperature difference data acquisition unit, and the input end of the temperature difference data acquisition unit is respectively connected to the signals of temperature probe No. 1 arranged on the inner wall of the adjusting protection cavity and temperature probe No. 2 arranged on the outer end of the bending protection sleeve.

[0016] As another improvement of the present application, the output end of the bending protection processing unit is also connected to a constant force maintaining unit, and the end of the flexible electric heating patch close to the cable body and the end of the external telescopic induction coil away from the cable body are fixedly connected to an electromagnetic repulsion sheet, and the output end of the constant force maintaining unit is connected to the electromagnetic repulsion sheet signal.

[0017] In summary, through the cooperation of the bending protection sleeve, the chuck, the flexible electric heating patch and the bending sensing component, the laying bending position of the cable body can be further protected when it is laid in cold areas. On the one hand, it can reduce the bending difficulty of the cable body during laying, avoid damage to the cable body caused by excessive bending, and improve the efficiency and safety of the cable body during laying in cold areas. At the same time, it can also use elastic protection to support the bending position of the cable body, reduce the continuous damage to the cable body caused by the torque generated by the bending, and extend the service life of the cable body at the bending point in cold areas. On the other hand, the laying position of the bending point can be heated, which can improve the flexibility of the cable body during laying and reduce the damage to the internal core of the cable body. At the same time, it can also perform insulation protection on the bending laying position of the cable body during the subsequent continuous use of the cable body, reduce the degree of influence of low temperature on the bending point, reduce the risk of hardening or even cracking, improve the durability of the cable body after laying, and effectively ensure the safety and stability of the cable body during power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axonometric diagram of the cable body in the first to third embodiments of the present application when it is not laid and is coordinated with the curved protective sleeve;

[0019] Figure 2 This is a control logic diagram of the bending protection subsystem of the second and third embodiments of the present application;

[0020] Figure 3 This is a front cross-sectional view of the bent protective sleeve when the cable body of the first to third embodiments of the present application is not laid;

[0021] Figure 4 This is an exploded view of the curved protective sleeve of the first to third embodiments of the present application;

[0022] Figure 5 This is a diagram showing changes in the bending protective sleeve when the cable body of the first to third embodiments of the present application is adjusted according to the laying bending angle;

[0023] Figure 6 This is a rear axonometric view of the bending protection sleeve stretching-triggered bending sensing assembly of the first to third embodiments of the present application;

[0024] Figure 7 It is a top view cross-sectional view of the bent protective sleeve when the cable body is bent 90° in the first and second embodiments of the present application;

[0025] Figure 8 It is a top view cross-sectional view of the bent protective sleeve when the cable body of the first and second embodiments of the present application is bent more than 90°;

[0026] Fig. 9 This is a top view of the bent protective sleeve when the cable body is bent at 90° according to the third embodiment of the present application;

[0027] Fig.10 This is a top view of a cross-sectional view of a bent protective sleeve when the cable body of the third embodiment of the present application is bent more than 90 degrees.

[0028] Description of the numbers in the figure:

[0029] 1 cable body, 2 bending protection sleeve, 21 adjusting protection cavity, 3 chuck, 31 ear, 4 flexible electric heating patch, 5 bending sensing component, 51 trigger pad, 52 inner telescopic induction coil, 521 inner induction contact block, 53 outer telescopic induction coil, 531 outer induction contact block. DETAILED DESCRIPTION

[0030] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1 and Figure 3 - Figure 8 A cold-resistant medium-voltage power cable is shown, comprising a cable body 1, a bending protection sleeve 2 is slidably sleeved on the outer end of the cable body 1, chucks 3 are bolted to the left and right ends of the bending protection sleeve 2, and the chucks 3 are slidably matched with the cable body 1, an adjustment protection cavity 21 is opened in the bending protection sleeve 2, a flexible electric heating patch 4 is fixedly connected to the inner wall of the adjusting protection cavity 21 away from the cable body 1, and a bending sensing component 5 matched with the flexible electric heating patch 4 is arranged between the left and right inner walls of the adjusting protection cavity 21;

[0033] The bending sensing component 5 includes a trigger pad 51 fixedly connected to the left and right inner walls of the adjusting protection cavity 21, an inner telescopic induction coil 52 is fixedly connected to the right end of the left trigger pad 51, and an outer telescopic induction coil 53 is fixedly connected to the left end of the right trigger pad 51, and the outer telescopic induction coil 53 is located on the outside of the inner telescopic induction coil 52, an inner sensing contact block 521 is fixedly connected to the right end of the inner telescopic induction coil 52, and an outer sensing contact block 531 matched with the inner sensing contact block 521 is fixedly connected to the left end of the outer telescopic induction coil 53, and the flexible electric heating patch 4 is connected to the inner sensing contact block 521 and the outer sensing contact block 531 through a wire. Through the cooperation of the bending protection sleeve 2, the chuck 3, the flexible electric heating patch 4 and the bending sensing component 5, the laying bending position of the cable body 1 can be further protected when it is laid in cold areas. On the one hand, it can reduce the cable body 1 reduces the difficulty of bending during laying, avoids damage to the cable body 1 caused by excessive bending, improves the efficiency and safety of laying the cable body 1 in cold areas, and can also use elastic protection to support the bending position of the cable body 1, reduce the continuous damage to the cable body 1 caused by the torque generated by the bending, and extend the service life of the bending part of the cable body 1 in cold areas. On the other hand, the laying position of the bending part can be heated, which can improve the flexibility of the cable body 1 during laying, reduce the damage to the internal core of the cable body 1, and insulate the bending laying position of the cable body 1 during the subsequent continuous use of the cable body 1, reduce the degree of influence of low temperature on the bending part, reduce the risk of hardening or even cracking, improve the durability of the cable body 1 after laying, and effectively ensure the safety and stability of the cable body 1 during power transmission.

[0034] Figure 1 and Figure 3 - Figure 8It is shown that when the cable body 1 is used in cold areas, the installation workers first put the bending protection sleeve 2 and the chuck 3 on the cable body 1 that needs to be bent, and then stretch the bending protection sleeve 2 according to the bending position of the cable body 1, fix the chuck 3 on either side of the left or right side at the bending starting position, and then slide the chuck 3 on the other side to make the bending protection sleeve 2 stretch and deform. When the bending protection sleeve 2 stretches and deforms, the two bending sensing components 5 in the regulating protection cavity 21 are displaced away from each other, causing the inner telescopic induction coil 52 and the outer telescopic induction coil 53 to move toward each other. After the outer sensing contact block 531 moves to contact the inner sensing contact block 521, the outer sensing contact block 531 and the inner sensing contact block 521 are clamped and contacted, causing the flexible electric heating patch 4 to generate heat by electricity, and the flexible electric heating patch 4 heats the inside of the regulating protection cavity 21. Under the action of the guide, the temperature acts on the cable body 1, and the flexibility of the cable body 1 is restored through the action of heating. Then the installation workers bend the cable body 1 with the bending protective sleeve 2 and fix it through the chuck 3 at the other end. To ensure the bending shape of the bending protective sleeve 2, the installation workers can select a suitable position to fix the bending protective sleeve 2, or clamp the bending protective sleeve 2 in a preset guide groove to complete the bending and laying of the cable body 1, thereby not only reducing the difficulty of bending and laying the cable body 1 in cold weather, and reducing the damage to the core of the cable body 1 caused by reduced flexibility during bending, but also supporting the bending position of the cable body 1 in an elastic protective manner, reducing the continuous damage to the cable body 1 caused by the torque generated by the bending, and extending the service life of the cable body 1 at the bending point in cold areas.

[0035] After the cable body 1 is laid and continuously used, the heat generated by the flexible electric heating patch 4 will maintain the flexibility of the cable body 1 at that position, thereby reducing the damage to the bent laying position of the cable body 1 under the dual effects of bending moment and cold weather, and can effectively offset the impact of cold weather, thereby promoting the durability of the bent laying position of the cable body 1, reducing the risk of hardening or even cracking, and effectively ensuring the safety and stability of the cable body 1 during power transmission.

[0036] Second implementation method:

[0037] Figure 1 - Figure 8A cold-resistant medium-voltage power cable is shown. As a functional addition to the first embodiment, those skilled in the art can select it according to actual needs. A microcontroller is also fixedly connected to the left side of the rear end of the bending protection sleeve 2. The microcontroller is equipped with a bending protection subsystem that matches the cable maintenance platform. The bending protection subsystem includes a bending protection processing unit. The input end of the bending protection processing unit is connected to a cable parameter collection unit and a bending sensing collection unit. The output end of the bending protection processing unit is connected to a thermal insulation protection unit and an abnormal alarm unit.

[0038] The input end of the cable parameter acquisition unit is connected to the cable maintenance platform signal through a wireless signal transmitter, and the input end of the bending sensing acquisition unit is connected to the inner sensing contact block 521 and the outer sensing contact block 531. The inner sensing contact block 521 and the outer sensing contact block 531 form an annular trigger switch. When the entire annular surface is abutted, the transmission and conduction of the abutment signal can be formed, otherwise it is in a disconnected state. The output end of the thermal insulation protection unit is connected to the flexible electric heating patch 4, and the output end of the abnormal alarm unit is connected to the cable maintenance platform signal through a wireless signal transmitter. The setting of the bending protection subsystem can perform separate protection and detection on the bending part of the cable body 1. On the one hand, it can improve the intelligence of the thermal insulation protection effect of the flexible electric heating patch 4 on the bending part. On the other hand, it can also assist in judging whether the bending part of the cable body 1 is in good condition by continuously monitoring the abutment state of the inner sensing contact block 521 and the outer sensing contact block 531, thereby playing an auxiliary maintenance role for the cable body 1, so that the cable body 1 can effectively face the cold weather in the subsequent application process, and also effectively solve the problem of inconvenience in maintenance and monitoring of the cable body 1 caused by cold weather.

[0039] Figure 2 It is shown that a power interface and a solar charging structure are respectively provided at the rear end of the microcontroller, and the power interface and the solar charging structure are connected to the microcontroller through independent lines. The setting of the power interface and the solar charging structure can provide the microcontroller with multiple power supply options, thereby increasing the applicability of the microcontroller during the laying process of the cable body 1, and selecting a suitable power supply method according to the laying environment to ensure the normal operation of the microcontroller and improve the protection effect of the cable body 1.

[0040] Figure 1 - Figure 8It is shown that both the front and rear ends of the chuck 3 are fixedly connected with support ears 31, and a mounting hole is opened on the support ear 31. The output end of the abnormal alarm unit is also connected to the alarm light signal installed on the support ear 31. The cooperation between the chuck 3 and the support ear 31 can facilitate the bending laying and installation of the cable body 1. When damage occurs at the bending part of the cable body 1, it can cooperate with the abnormal alarm unit to generate a light warning, which is convenient for maintenance personnel to confirm the abnormal position in time and reduce the difficulty of maintenance personnel on the cable body 1 in cold areas.

[0041] Figure 2 It is shown that the input end of the bending protection unit is also connected to a temperature difference data acquisition unit, and the input end of the temperature difference data acquisition unit is respectively connected to the signal of the No. 1 temperature probe arranged on the inner wall of the adjusting protection cavity 21 and the No. 2 temperature probe arranged on the outer end of the bending protection sleeve 2. The setting of the temperature difference data acquisition unit can assist the bending protection subsystem to judge the internal and external environment of the bending protection sleeve 2 at this time, while ensuring the effectiveness of the insulation at the bending part of the cable body 1, it can also turn off the electric heating effect of the flexible electric heating patch 4 when the external temperature is sufficient, play an effective role in energy saving and environmental protection, and further promote the environmental applicability of the bending protection subsystem.

[0042] Figure 2 and Figure 6-8 It is shown that the output end of the bending protection processing unit is also connected to a constant force maintaining unit, and the end of the flexible electric heating patch 4 close to the cable body 1 and the end of the outer telescopic induction coil 53 away from the cable body 1 are fixedly connected with electromagnetic repulsion sheets, and the output end of the constant force maintaining unit is connected to the electromagnetic repulsion sheet signal. The setting of the constant force maintaining unit can ensure the position effectiveness of the inner sensing contact block 521 and the outer sensing contact block 531 during the bending and laying process of the cable body 1, avoid problems such as abnormal contact between the inner sensing contact block 521 and the outer sensing contact block 531 due to the bending state, and ensure the effectiveness of subsequent thermal insulation protection of the cable body 1.

[0043] Figure 1 - Figure 8It is shown that when the cable body 1 is used in cold areas, according to the laying position of the cable body 1, the laying technician can select the power access method of the microcontroller, and select the power interface for power supply at the location with a power supply device to ensure the stability of the power supply. At the location without a power supply device, a solar charging structure is selected as the power supply. The green energy storage method is used to reduce the laying and maintenance costs of the cable body 1, ensure the data transmission between the cable maintenance platform and the bending protection subsystem, and promote the protection and monitoring of the cable body 1. Then, when the cable body 1 is laid, the cable technician transmits basic data about the cable body 1 including the cable diameter, the accuracy of the required bending laying, and other data to the cable parameter acquisition unit through the cable maintenance platform and the wireless transmitter, as well as data about the laying environment of the cable body 1 including the temperature change range throughout the year, and then the cable parameter acquisition unit transmits these parameter data to the bending protection processing unit, and the bending protection processing unit processes and stores these data.

[0044] Then, when the cable body 1 is being laid, that is, the installation workers move until the inner sensing contact block 521 and the outer sensing contact block 531 are in contact with each other, and then the bending sensing acquisition unit receives the contact signal and transmits it to the bending protection processing unit. The bending protection processing unit determines that the cable body 1 needs to be bent at this time, and then transmits a control instruction to the thermal insulation protection unit, so that the thermal insulation protection unit controls the flexible electric heating patch 4 to generate electric heating, and performs thermal insulation protection on the bending position of the cable body 1, thereby reducing the impact of cold on its flexibility, so that the installation workers can effectively bend the cable body 1 and reduce the bending damage of the cable body 1. Before the bending protection processing unit controls the thermal insulation protection unit, the temperature difference data acquisition unit receives the internal and external temperature data transmitted by the No. 1 temperature probe and the No. 2 temperature probe, and then transmits the temperature data to the bending protection processing unit, so that the bending protection processing unit can perform thermal insulation protection based on this. The temperature data at that time is used to issue appropriate control instructions to the thermal insulation protection unit, which can restore the flexibility of the cable body 1 while avoiding damage to the cable body 1 caused by excessive temperature, and adjust the damage to the electromagnetic repulsion sheet inside the protective cavity 21. While controlling the action of the thermal insulation protection unit, the bending protection processing unit will also transmit the control instruction to the constant force maintaining unit, so that the constant force maintaining unit passes current to the electromagnetic repulsion sheet, so that the electromagnetic repulsion sheet located on the flexible electric heating patch 4 and the outer telescopic induction coil 53 produce the same magnetic force. Under the action of the magnetic repulsion, the outer telescopic induction coil 53 is kept close to the inner telescopic induction coil 52, thereby ensuring the effectiveness of the abutment between the inner induction contact block 521 and the outer induction contact block 531 during the bending construction of the cable body 1, and also ensuring the continuity of the thermal insulation of the thermal insulation protection unit and the effectiveness of the subsequent monitoring of the state of the bending part of the cable body 1.

[0045] After the cable body 1 is laid, the bending protection processing unit adjusts the suitability of the function of the thermal insulation protection unit according to the temperature data and temperature difference data transmitted by the temperature difference data acquisition unit. When the external temperature is low, the electric heating function of the flexible electric heating patch 4 is guaranteed to avoid damage to the bending position of the cable body 1 caused by too low temperature. When the external temperature is too high, the flexible electric heating patch 4 is reduced or the electric heating function of the flexible electric heating patch 4 is stopped. While protecting the cable body 1 from damage, it can play an effective energy-saving and environmental protection role. If the bending laying position of the cable body 1 is damaged due to long-term use, cracks or breaks in the insulation layer, shielding layer and protective layer, the insulation layer, shielding layer and protective layer will lose their supporting force, thereby causing a large deformation of the bending position of the cable body 1, and a local extrusion effect on the bending protection sleeve 2. The local extrusion effect will cause the adjustment protection cavity 21 to produce Local deformation will resist the magnetic repulsion between the trigger pad 51 and the flexible electric heating patch 4, causing the inner sensing contact 521 and the outer sensing contact 531 to be misaligned or flipped up, thereby making the bending sensing acquisition unit unable to receive the abutment signal, and the bending sensing acquisition unit no longer transmits the abutment signal to the bending protection processing unit. Therefore, the bending protection processing unit at this time determines that the bending position of the cable body 1 is damaged, and then transmits the abnormal data to the abnormal alarm unit, so that the abnormal alarm unit sends the abnormal data to the cable maintenance platform through the wireless transmitter, so that the cable maintenance platform can send an abnormal indication to the cable maintenance personnel. At the same time, the abnormal alarm unit will activate the alarm light on the support ear 31, which serves as a warning reminder. On the one hand, it can facilitate the cable maintenance personnel to find the abnormal position and improve the maintenance efficiency. On the other hand, it can send a reminder to the inspection personnel, further playing the role of maintenance reminder.

[0046] The third implementation method:

[0047] Figure 1 - Figure 6 , Fig. 9 and Fig.10A cold-resistant medium-voltage power cable is shown as a functional addition of the second embodiment. Technical personnel in this field can select it according to actual needs. The regulating protective cavity 21 is filled with inert protective gas. The right side of the rear end of the bending protective sleeve 2 is fixedly connected with a pressure regulating interface connected to the regulating protective cavity 21. The output end of the bending protection processing unit is also connected to an internal stress release unit. The output end of the internal stress release unit is connected to the signal of the electric control valve arranged on the pressure regulating interface. The filling of the inert protective gas can improve the protection effect of the bending protective sleeve 2 on the cable body 1, and play an effective protective and buffering role. In combination with the setting of the internal stress release unit, after the cable body 1 is bent and laid, the pressure of the inert protective gas in the regulating protective cavity 21 can be reduced to release the limiting effect of the bending protective sleeve 2 on the bending curvature of the cable body 1, thereby increasing the bending curvature of the cable body 1 and reducing the damage caused to the cable body 1 itself by the bending moment, thereby further extending its service life.

[0048] Figure 2 It is shown that the input end of the bending protection processing unit is also connected to a pressure collection unit, and the input end of the pressure collection unit is connected to the signal of a pressure probe arranged in the adjustment protection cavity 21. The setting of the pressure collection unit can assist the application of the internal stress release unit and improve its pressure release accuracy. While ensuring the arc release of the cable body 1, it ensures the effectiveness of monitoring the internal sensing contact block 521 and the external sensing contact block 531.

[0049] Figure 1 - Figure 6 , Fig. 9 and Fig.10 It is shown that when the pressure acquisition unit and the internal stress release unit are selected for use, the bending protection processing unit first determines the pressure data that can release the bending curvature of the cable according to the data about the cable transmitted by the cable parameter acquisition unit and the data of the cable bending and laying. Then, after the cable body 1 is laid, the pressure probe transmits the pressure data in the regulating protection cavity 21 at this time to the pressure acquisition unit. Then, the bending protection unit receives the pressure data transmitted by the pressure acquisition unit, and calculates and processes the pressure data and the pressure data that needs to be released calculated above, and then transmits a release instruction to the internal stress release unit, so that the internal stress release unit opens the electric control valve located on the pressure regulating interface to release the inert protective gas in the regulating protection cavity 21 at this time. After releasing enough data, the electric control valve on the pressure regulating interface is closed. By releasing the pressure, the limiting effect of the bending protection sleeve 2 on the bending curvature of the cable body 1 is reduced, so that the cable body 1 can release the bending curvature under its own elastic action, and then the bending curvature can be reduced by increasing the bending curvature. The damage caused by the bending moment to the cable body 1 itself plays an effective protective role and further promotes the durability of the cable body 1 at the bending point when laid in a cold environment.

[0050] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cold-resistant medium-voltage power cable, characterized in that: The invention comprises a cable body (1), wherein a bending protection sleeve (2) is slidably sleeved on the outer end of the cable body (1), and chucks (3) are bolted to the left and right ends of the bending protection sleeve (2), and the chucks (3) are slidably matched with the cable body (1), an adjustment protection cavity (21) is provided in the bending protection sleeve (2), a flexible electric heating patch (4) is fixedly connected to the inner wall of the adjustment protection cavity (21) on the side away from the cable body (1), and a bending sensing component (5) matched with the flexible electric heating patch (4) is provided between the left and right inner walls of the adjustment protection cavity (21); The bending sensing component (5) comprises a trigger pad (51) fixedly connected to the left and right inner walls of the regulating protection cavity (21); an inner telescopic induction coil (52) is fixedly connected to the right end of the trigger pad (51) located on the left side; an outer telescopic induction coil (53) is fixedly connected to the left end of the trigger pad (51) located on the right side, and the outer telescopic induction coil (53) is located outside the inner telescopic induction coil (52); an inner induction contact block (521) is fixedly connected to the right end of the inner telescopic induction coil (52); an outer induction contact block (531) matching the inner induction contact block (521) is fixedly connected to the left end of the outer telescopic induction coil (53); and the flexible electric heating patch (4) is connected to the inner induction contact block (521) and the outer induction contact block (531) via a wire.

2. A cold-resistant medium-voltage power cable according to claim 1, characterized in that: The left side of the rear end of the bending protection sleeve (2) is also fixedly connected to a microcontroller, the microcontroller is equipped with a bending protection subsystem that cooperates with the cable maintenance platform, the bending protection subsystem comprises a bending protection processing unit, the input end of the bending protection processing unit is connected to a cable parameter collection unit and a bending sensing collection unit, and the output end of the bending protection processing unit is connected to a thermal insulation protection unit and an abnormal alarm unit; The input end of the cable parameter acquisition unit is connected to the cable maintenance platform signal via a wireless signal transmitter, the input end of the bending sensing acquisition unit is connected to the inner sensing contact block (521) and the outer sensing contact block (531) signal, the output end of the thermal insulation protection unit is connected to the flexible electric heating patch (4) signal, and the output end of the abnormal alarm unit is connected to the cable maintenance platform signal via a wireless signal transmitter.

3. A cold-resistant medium-voltage power cable according to claim 2, characterized in that: The front and rear ends of the chuck (3) are fixedly connected to support ears (31), and a mounting hole is provided on the support ear (31). The output end of the abnormal alarm unit is also connected to the alarm light signal installed on the support ear (31).

4. A cold-resistant medium-voltage power cable according to claim 2, characterized in that: The rear end of the microcontroller is respectively provided with a power interface and a solar charging structure, and the power interface and the solar charging structure are connected to the microcontroller through independent lines.

5. A cold-resistant medium-voltage power cable according to claim 2, characterized in that: The regulating protection cavity (21) is filled with an inert protective gas, a pressure regulating interface connected to the regulating protection cavity (21) is fixedly connected to the right side of the rear end of the bending protection sleeve (2), the output end of the bending protection processing unit is also connected to an internal stress release unit, and the output end of the internal stress release unit is connected to an electric control valve signal arranged on the pressure regulating interface.

6. A cold-resistant medium-voltage power cable according to claim 5, characterized in that: The input end of the bending protection processing unit is also connected to a pressure collection unit, and the input end of the pressure collection unit is connected to a pressure probe signal arranged in the regulating protection cavity (21).

7. A cold-resistant medium-voltage power cable according to claim 2, characterized in that: The input end of the bending protection unit is also connected to a temperature difference data acquisition unit, and the input end of the temperature difference data acquisition unit is respectively connected to a No. 1 temperature probe arranged on the inner wall of the regulating protection cavity (21) and a No. 2 temperature probe arranged on the outer end of the bending protection sleeve (2).

8. The cold-resistant medium-voltage power cable according to claim 2, characterized in that: The output end of the bending protection processing unit is also connected to a constant force maintaining unit, and the end of the flexible electric heating patch (4) close to the cable body (1) and the end of the outer telescopic induction coil (53) away from the cable body (1) are both fixedly connected to an electromagnetic repulsion sheet, and the output end of the constant force maintaining unit is signal-connected to the electromagnetic repulsion sheet.

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