An ultrahigh pressure lead seal monitoring cable terminal

Abstract

The application discloses an ultrahigh-pressure lead seal monitoring cable terminal and particularly relates to the technical field of cable terminals, which comprises a protection box, a support monitoring assembly is arranged in the protection box, the support monitoring assembly comprises an inner lining frame arranged in the protection box, a rotating disc is rotatably connected to one side of the inner lining frame, a plurality of guide frames are distributed on the outer side of the rotating disc, and each two adjacent guide frames are provided with a supporting plate at one end. The application can automatically adjust the position of the supporting plate by spring compression buffering and triggering displacement sensor feedback data to the controller, ensure that the cable always maintains the optimal tension during the conveying process, significantly improve the wiring safety and efficiency, capture the electromagnetic wave and pulse current generated by the PD in the cable, combine the sensors in the triangular layout close to the cable surface, realize the early positioning of the cable defects, replace the current transformer with an acceleration sensor, perceive the external force vibration risk, realize the insulation aging early warning, the poor contact diagnosis and the sealing failure judgment, and support the predictive maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of cable terminals, and more particularly to an ultra-high voltage lead-sealed monitoring cable terminal. Background Art

[0002] Ultra-high voltage (UHV) refers to cable terminals designed for extremely high operating voltage levels. In power systems, "UHV" typically refers to voltage levels of 220kV, 330kV, 500kV, 750kV, and even higher. This means the terminals must possess extremely high electrical insulation strength, excellent electric field control capabilities, and reliable long-term performance to withstand such high voltage stresses. Lead sealing primarily refers to a traditional or classic cable terminal sealing structure: a lead sleeve or sheath: a tubular lead casing wrapped around the cable insulation. The primary purpose of this seal is to provide extremely reliable air and water tightness, preventing the intrusion of the external environment (especially moisture and air) into the cable terminal. This is critical to ensuring the long-term safe operation of UHV cable terminals (avoiding electrical and water treeing, partial discharge, and other hazards). Cable terminals are installed at the end of a cable line to establish the electrical connection between the cable and other power equipment, such as overhead lines, transformers, and switchgear. They provide the necessary electrical insulation, mechanical protection, and sealing. Monitoring is a critical component of cable lines, and their performance directly impacts the reliability of the entire transmission line.

[0003] Patent publication number CN210092791U discloses a cable transfer box, comprising a transfer box body, a holder, a cable adapter, a humidity sensor, a mutual inductor coil, a counter button, a data processor, and a battery. The transfer box body comprises a housing, which defines a first accommodating chamber, and the holder is fixedly disposed in the first accommodating chamber by connecting the housing. The cable adapter is mounted on the holder to connect the bypass cable terminal head and the cable terminal head to form a cable joint. The cable adapter includes a clamp mounting portion. A temperature sensor detects the operating temperature at the cable joint.

[0004] When this structure is in use, the transformer coil detects the current flowing through the cable adapter. A counter button detects the number of times the cable adapter has been used. A data processor collects information about the operating temperature of the cable connector, the current flowing through the cable adapter, and the number of times the cable adapter has been used. However, when the cable is connected inside this processor, the tension cannot be adjusted according to the requirements of cable routing. It is also difficult to determine whether there is overload, poor contact, insulation aging, heating, or abnormal heat dissipation based on temperature changes. Therefore, an ultra-high voltage lead-sealed monitoring cable terminal is provided. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an ultra-high voltage lead-sealed monitoring cable terminal, which aims to solve the problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: an ultra-high voltage lead-sealed monitoring cable terminal, comprising a protection box, wherein a support monitoring component is provided in the protection box;

[0007] The support monitoring assembly includes an inner lining frame arranged in the protective box, one side of the inner lining frame is rotatably connected to a turntable, a plurality of guide frames are distributed on the outer side of the turntable, and one end of each of the two adjacent guide frames is provided with a support plate;

[0008] The control wheel that is located at the top of described sliding panel also is provided with an end face that is provided with of sliding panel withstands on the backrest, and the rotation shutter motor is to be stepped on the adjusting base to move upwards to adjust the driving mechanism.

[0009] Optionally, in a possible embodiment, a plurality of third electric push rods are provided on the top of the side connecting plate, and the cross-sectional shape of each of the third electric push rods is combined into a triangle, one end of each of the plurality of third electric push rods is provided with a processor, and the other end of the third electric push rod is provided with a high-frequency UHF sensor, and the high-frequency UHF sensor is provided with a current transformer;

[0010] Optionally, in a possible embodiment, a plurality of baffles are plugged into the inner liner frame, and each of the baffles is distributed along the circumference of the axis point of the turntable, the top of the protective box is slidably connected to two sliders, and each of the sliders is rotatably connected to a pressure rod, two fourth electric push rods are hinged on the protective box, and the output end of each of the fourth electric push rods extends to the slider respectively, a PLC controller is provided on one side of the protective box, a first wire management barrel is embedded in the PLC controller, and a second wire management barrel is provided on one side of the bottom of the inner liner frame;

[0011] Technical effects and advantages of the present invention:

[0012] 1. The application rotates multiple sets of guide frames and supporting plates by the rotating disc, combines the linkage of the first electric push rod, spring and displacement sensor, senses the cable tension in real time, and the spring compression buffers and triggers the displacement sensor to feed back data to the regulator, automatically adjusts the supporting plate position, ensures that the cable always maintains optimal tension during the conveying process, avoids relaxation and slip, prevents over-tightening and breakage, significantly improves wiring safety and efficiency;

[0013] 2. The application realizes full-coverage monitoring of key parameters by integrating multiple sensors such as micro-thermocouple, high-frequency UHF sensor and current transformer, the micro-thermocouple directly contacts the cable conductor connection point, captures the current-carrying heating data in real time, the high-frequency UHF sensor captures the electromagnetic wave signal of insulation defects, and the current transformer synchronously detects the PD pulse current, and the multi-source signal fusion improves the defect positioning accuracy;

[0014] 3. The high-frequency UHF sensor and the current transformer can capture the electromagnetic wave and pulse current generated by the PD inside the cable, and the third electric push rod driven sensor in a triangular layout is close to the surface of the cable, which realizes early positioning of insulation defects such as bubbles and impurities, the current transformer can be replaced by an acceleration sensor to sense the risk of external force vibration, realize insulation aging warning, contact fault diagnosis and sealing failure judgment, and support predictive maintenance;

[0015] 4. The first electric push rod drives the supporting plate displacement through the displacement sensor, and the elastic reset mechanism of the spring makes the supporting plate maintain a tight state when it touches the cable and avoids excessive pulling and breakage, the rotating disc rotates to drive the supporting plate to convey the cable through friction, realizes the dynamic balance of tension, the second electric push rod drives the sliding seat to adjust the distance between the calibration wheels, and cooperates with the clamping structure of the traction wheel and the anti-skid wheel to realize the axial calibration of cables with different diameters, avoid deviation or winding during conveying, and improve the wiring precision; the fourth electric push rod drives the pressure rod to adjust the winding tension to prevent the cable from loosening;

[0016] In summary, the spring compression buffers and triggers the displacement sensor to feed back data to the regulator, automatically adjusts the supporting plate position, ensures that the cable always maintains optimal tension during the conveying process, significantly improves wiring safety and efficiency, can capture the electromagnetic wave and pulse current generated by the PD inside the cable, and the sensor in a triangular layout is close to the surface of the cable, which realizes early positioning of cable defects, the current transformer can be replaced by an acceleration sensor to sense the risk of external force vibration, realize insulation aging warning, contact fault diagnosis and sealing failure judgment, and support predictive maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limited to the actual size, actual process, actual timing of signals, etc. of the products involved in the embodiments of the present disclosure.

[0018] Figure 1 It is a front view of the overall structure of the present application.

[0019] Figure 2 It is a side view of the overall structure of the present application.

[0020] Figure 3 It is a schematic diagram of the support monitoring assembly of the present application.

[0021] Figure 4 It is a schematic diagram of the inner lining frame, side connecting plate, processor, high-frequency UHF sensor, second connecting frame, traction wheel and anti-skid wheel installed together.

[0022] Figure 5 It is a schematic diagram of the sliding block, sliding block and fourth electric push rod.

[0023] Figure 6 It is a schematic diagram of the turntable, guide frame, supporting plate and regulator.

[0024] Figure 7 It is an exploded view of the present application Figure 6 .

[0025] The reference signs are as follows: 1, protective box; 2, inner lining frame; 3, turntable; 4, guide frame; 5, supporting plate; 6, regulator; 7, first electric push rod; 8, displacement sensor; 9, spring; 10, motor; 11, side connecting plate; 12, first connecting frame; 13, sliding seat; 14, calibration wheel; 15, second electric push rod; 16, second connecting frame; 17, traction wheel; 18, anti-skid wheel; 19, micro thermocouple; 20, third electric push rod; 21, processor; 22, high-frequency UHF sensor; 23, current transformer; 24, blocking rod; 25, sliding block; 26, pressing rod; 27, fourth electric push rod; 28, PLC controller; 29, first wire arranging cylinder; 30, second wire arranging cylinder. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] As attached Figure 1 -Attached Figure 7 The illustrated ultra-high voltage lead-sealed monitoring cable terminal utilizes a support monitoring assembly provided on a protective box 1, which drives multiple guide frames 4 and support plates 5 to rotate via a turntable 3. The terminal, in conjunction with a first electric push rod 7, a spring 9, and a displacement sensor 8, senses the cable tension in real time. The spring 9 compresses and buffers, triggering the displacement sensor 8 to feed back data to a controller 6, automatically adjusting the position of the support plate 5 to ensure that the cable always maintains optimal tension during transportation, preventing both loosening and slipping, and preventing breakage due to over-tightening. This significantly improves cabling safety and efficiency. The specific structural configuration of the assembly is as follows:

[0028] The support monitoring assembly includes an inner lining frame 2 arranged in the protective box 1. A turntable 3 is rotatably connected to one side of the inner lining frame 2. A plurality of guide frames 4 are distributed on the outside of the turntable 3, and a support plate 5 is provided at one end of each two adjacent guide frames 4.

[0029] As attached Figure 2 、 3 As shown in Figures 6 and 7, the guide frame 4 is used as a support point. When the turntable 3 rotates, multiple guide frames 4 are driven to rotate. When the guide frame 4 rotates and displaces along the axis of the turntable 3, each support plate 5 can be driven to rotate, so that when the support plate 5 rotates, it rubs against the cable and transports the cable through friction.

[0030] Several regulators 6 are embedded in the turntable 3, and each regulator 6 is located on one side of the corresponding support plate 5. A first electric push rod 7 is embedded in the guide frame 4. A spring 9 is provided at the output end of the first electric push rod 7. A displacement sensor 8 is fixed at one end of the spring 9. The displacement sensor 8 is fixed on the support plate 5. A motor 10 for driving the turntable 3 to rotate is provided on the side of the lining frame 2 away from the turntable 3.

[0031] As attached Figure 7As shown, the regulator 6 and the displacement sensor 8 are connected together by a wire, and the first electric push rod 7 drives the displacement sensor 8 to drive the support plate 5 to move. The displacement sensor 8 senses the displacement stroke of the support plate 5. At the same time, the spring 9 compresses the support plate 5 when it is pressed by the cable, and the elasticity of the spring 9 drives the support plate 5 to reset, so that the support plate 5 can contact the cable, so that the cable can be in a taut state during the transportation process without being broken. The setting of the motor 10 makes it convenient to drive the turntable 3 to rotate when the motor 10 rotates, so as to facilitate the transportation of the cable.

[0032] One end of the liner frame 2 is provided with a side connecting plate 11, a first connecting frame 12 is provided on the top of the side connecting plate 11, a slide 13 is provided at one end of the first connecting frame 12, and a calibration wheel 14 is rotatably connected to the slide 13 and the first connecting frame 12 respectively. A second electric push rod 15 for driving the slide 13 to move is provided on the side of the slide 13 away from the calibration wheel 14. The slide 13 is slidably connected to the side connecting plate 11, as shown in the attached figure. Figure 4 As shown, the second electric push rod 15 drives the slide 13 to move, and the slide 13 moves closer to the first connecting frame 12, so that the calibration wheels 14 on the slide 13 can contact the outside of the calibration wheels 14 on the first connecting frame 12, and then the cable can be wrapped between the calibration wheels 14, ensuring the stability of the cable. A second connecting frame 16 is set on the top of the first connecting frame 12. The second connecting frame 16 is fixed to the liner frame 2. One side of the second connecting frame 16 is rotatably connected to a traction wheel 17. One side of the traction wheel 17 is provided with an anti-slip wheel 18. A micro thermocouple 19 is embedded in the traction wheel 17, as shown in the attached figure. Figure 4 As shown, the cable is pressed between the anti-slip wheel 18 and the traction wheel 17 by the coordinated use of the traction wheel 17 and the anti-slip wheel 18, and the miniature thermocouple 19 presses against the cable. The conductor of the miniature thermocouple 19 forms a connection point with the cable to reflect the current carrying and contact resistance. Due to the concentrated electric field area of ​​the cable, it is easy to generate heat, and then the heat is transferred to the surface of the lead seal shell. The temperature change is used to judge whether there is overload, poor contact, insulation aging and heating, or abnormal heat dissipation.

[0033] A plurality of third electric push rods 20 are provided on the top of the side connecting plate 11, and the cross-section of each third electric push rod 20 is combined into a triangular shape. A processor 21 is provided at one end of each of the third electric push rods 20, and a high-frequency UHF sensor 22 is provided at the other end of the third electric push rod 20. A current transformer 23 is provided on the high-frequency UHF sensor 22;

[0034] As attached Figure 4As shown, a high-frequency UHF sensor 22 is connected to a processor 21 via a wire. The high-frequency UHF sensor 22 is driven to move by a third electric push rod 20, which in turn causes a current transformer 23 to contact the cable. The current transformer 23 captures the pulsed current generated by the power distribution (PD), while the high-frequency UHF sensor 22 captures the electromagnetic waves radiated by the PD. The current transformer 23 is attached to the outer surface of the cable and detects transient ground voltages coupled from the internal PD to the outer casing. PD is an early sign of insulation defects such as bubbles, impurities, and cracks. By analyzing the amplitude, phase, frequency, and waveform of the PD signal, the defect location, such as the stress cone or the main insulation interface, can be located and its severity assessed. Furthermore, each high-frequency UHF sensor 22 and current transformer 23 can be replaced with an accelerometer or a temperature and humidity sensor as needed. The accelerometer detects abnormal vibration or deformation caused by external forces to prevent mechanical damage, while the temperature and humidity sensor monitors ambient temperature and humidity, assisting in analyzing terminal temperature data, eliminating environmental interference, and assessing the effectiveness of the seal.

[0035] A plurality of baffles 24 are plugged into the liner frame 2, and each baffle 24 is distributed along the circumference of the axis of the turntable 3;

[0036] As attached Figure 1 、 2 As shown in FIG4 , the arrangement of the barrier rod 24 facilitates the lifting of the cable outside the support plate 5 and the restraint of the cable during transportation, so that the cable can be wound along the axis of the turntable 3 .

[0037] The top of the protective box 1 is slidably connected to two sliders 25, and each slider 25 is rotatably connected to a pressure rod 26. Figure 1 、 2 , 3 and 5, the slider 25 slides on the top of the protective box 1 to drive the pressure rod 26 to adjust its position, so that the pressure rod 26 can contact the outside of the wound cables, making it easy to adjust the tension of the cables when they are wound, and avoid looseness and unstable transportation. Two fourth electric push rods 27 are hinged on the protective box 1, and the output ends of each fourth electric push rod 27 extend to the slider 25, as shown in the attached figure. Figure 3 and 5 As shown, after the fourth electric push rod 27 is started, the output end of the fourth electric push rod 27 extends to drive the slider 25 to drive the pressure rod 26 to move horizontally on the protection box 1, so as to adjust the position of the pressure rod 26.

[0038] A PLC controller 28 is provided on one side of the protective box 1, a first wire management barrel 29 is embedded in the PLC controller 28, and a second wire management barrel 30 is provided on one side of the bottom of the lining frame 2;

[0039] As attached Figure 1And the inner lining frame 2, as shown, through the PLC controller 28, in order to facilitate the PLC controller 28 display test results and on the PLC controller 28 control, and the second wire management drum 30 is convenient for the cable to be wound outside the support plate 5 through the second wire management drum 30 and inserted into the traction wheel 17, the anti-skid wheel 18 and the calibration wheel 14.

[0040] The specific working principle is as follows: the cable wound on the support plate 5 outside the rotating disc 3 is driven to rotate around the axis of the inner lining frame 2 by the motor 10 after being energized, and the uniformly distributed guide frame 4 outside rotates with the rotating disc, and the support plate 5 between adjacent guide frames is driven to move axially by friction. The first electric push rod 7 extends and retracts according to the feedback signal of the displacement sensor 8, and pushes the spring 9 and the support plate 5 to displace: when the cable tension increases, the spring 9 is compressed to buffer the tension; when the tension decreases, the spring 9 resets to keep the support plate 5 in contact with the pressure, ensuring that the cable is always in a stable and tight state.

[0041] The fourth electric push rod 27 drives the sliding block 25 to translate on the top of the protection box, drives the pressing rod 26 to contact the wound cable outside, controls the winding density by adjusting the position of the pressing rod 26, and avoids the influence of loose cable on the stability of conveying.

[0042] After the cable leaves the rotating disc 3, it passes through the second wire management drum 30 into the monitoring area, the second electric push rod 15 pushes the sliding seat 13 to approach the first connecting frame 12, so that the calibration wheels 14 on both sides clamp the cable, and the cable direction is corrected by the centering action of the double wheels, the traction wheel 17 and the anti-skid wheel 18 clamp the cable by friction, and the micro thermocouple 19 is in close contact with the surface of the cable. When the cable moves, the traction wheel 17 drives the anti-skid wheel 18 to rotate synchronously, which not only provides traction but also prevents slipping, and the thermocouple collects temperature data in real time and transmits the temperature data to the processor 21 in real time; when partial discharge occurs, the third electric push rod current transformer 23 pushes the high-frequency UHF sensor 22 and the current transformer 23 to abut against the surface of the cable, and synchronously captures the PD electromagnetic wave and pulse current signal; further, the acceleration sensor can be replaced to monitor mechanical vibration, and the temperature and humidity sensor can evaluate the environmental sealing performance.

[0043] Furthermore, the cable is output after being compacted by the traction wheel 17 and the anti-skid wheel 18, the stop rod 24 is distributed along the circumference of the rotating disc axis, limiting the radial displacement of the cable outside the support plate 5, ensuring that the cable is arranged neatly along the axis during winding; the second wire management drum 30 guides the cable to penetrate through the inner lining frame 2, and is guided out from the first wire management drum 29 after passing through the calibration wheel 14 and the traction wheel 17, forming an orderly wiring path.

[0044] The above is only a preferred embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-high voltage sealed monitoring cable terminal, comprising a protective box (1), characterized in that: A support monitoring component is provided in the protection box (1); The support monitoring assembly comprises an inner lining frame (2) arranged in the protective box (1), a turntable (3) is rotatably connected to one side of the inner lining frame (2), a plurality of guide frames (4) are distributed outside the turntable (3), and a support plate (5) is provided at one end of each of two adjacent guide frames (4); A plurality of regulators (6) are embedded in the turntable (3), and each regulator (6) is located on one side of a corresponding support plate (5). A first electric push rod (7) is embedded in the guide frame (4). A spring (9) is provided at the output end of the first electric push rod (7). A displacement sensor (8) is fixedly provided at one end of the spring (9). The displacement sensor (8) is fixed on the support plate (5). A motor (10) for driving the turntable (3) to rotate is provided on the side of the lining frame (2) away from the turntable (3).

2. The ultra-high voltage sealed monitoring cable terminal according to claim 1, characterized in that: A side connecting plate (11) is provided at one end of the lining frame (2), a first connecting frame (12) is provided at the top of the side connecting plate (11), a slide (13) is provided at one end of the first connecting frame (12), and calibration wheels (14) are rotatably connected to the slide (13) and the first connecting frame (12), respectively, a second electric push rod (15) for driving the slide (13) to move is provided on the side of the slide (13) away from the calibration wheel (14), and the slide (13) is slidably connected to the side connecting plate (11).

3. The ultra-high voltage lead-sealed monitoring cable terminal according to claim 2, characterized in that: A second connecting frame (16) is provided on the top of the first connecting frame (12), the second connecting frame (16) is fixed on the liner frame (2), one side of the second connecting frame (16) is rotatably connected to a traction wheel (17), one side of the traction wheel (17) is provided with an anti-slip wheel (18), and a micro thermocouple (19) is embedded in the traction wheel (17).

4. The ultra-high voltage lead-sealed monitoring cable terminal according to claim 2, characterized in that: A plurality of third electric push rods (20) are provided on the top of the side connecting plate (11), and the cross-sectional shape of each of the third electric push rods (20) is combined into a triangle, one end of each of the plurality of third electric push rods (20) is provided with a processor (21), and the other end of the third electric push rod (20) is provided with a high-frequency UHF sensor (22), and a current transformer (23) is provided on the high-frequency UHF sensor (22).

5. The ultra-high voltage sealed monitoring cable terminal according to claim 1, characterized in that: A plurality of baffles (24) are plugged into the inner lining frame (2), and each of the baffles (24) is distributed along the circumference of the axis of the turntable (3).

6. The ultra-high voltage lead-sealed monitoring cable terminal according to claim 1, characterized in that: The top of the protection box (1) is slidably connected to two sliders (25), and each slider (25) is rotatably connected to a pressure rod (26).

7. The ultra-high voltage sealed monitoring cable terminal according to claim 6, characterized in that: Two fourth electric push rods (27) are hinged on the protection box (1), and the output end of each fourth electric push rod (27) extends to the slider (25).

8. The ultra-high voltage lead-sealed monitoring cable terminal according to claim 1, characterized in that: A PLC controller (28) is provided on one side of the protective box (1), a first wire management barrel (29) is embedded in the PLC controller (28), and a second wire management barrel (30) is provided on one side of the bottom of the lining frame (2).

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