On-line tension detector for high-voltage cable

Abstract

The invention belongs to the technical field of tension sensors, and particularly relates to a high-voltage cable online tension detector, which comprises a half wire clamp, the top end of the half wire clamp is fixedly connected with a support block, the top end of the support block is fixedly sleeved with a protection box, and the upper surface of the support block is fixedly connected with an extension rod. According to the invention, the high-voltage cable online tension detector has a multi-position tension detection function, can detect the tension conditions of two high-voltage cables at the insulator of a power tower at the same time, and also has the functions of detection temperature regulation and control and high-humidity environment interference prevention; moreover, the protection capability of the detector can be effectively improved in cooperation with the protection box and the top cover, thereby improving the accuracy of the tension detection result of the tension detector, enabling a worker to timely and accurately understand the tension condition of the high-voltage cable, improving the use effect of the tension detector, and guaranteeing the reliability of power transmission of the high-voltage cable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tension sensors, and particularly relates to a high-voltage cable online tension detector. BACKGROUND

[0002] The high-voltage cable is a cable for transmitting high-voltage electric energy, has the characteristics of strong insulation performance and good conductivity, and undertakes the important task of long-distance large-capacity electric energy transmission in the power system. When the high-voltage cable is disturbed by strong wind or the tension load increases due to the ice and snow attached to the line, the tension load may exceed the maximum tension that the cable can bear, which may cause the cable to break, and may also cause the tower to be damaged or collapsed due to the unbalanced tension between the two ends of the power tower. Therefore, a tension detector needs to be installed on the high-voltage cable to test the tension, and the tension change of the high-voltage cable needs to be understood in time. For example, patent authorization announcement No. CN107325513B discloses a high-voltage cable online tension detector.

[0003] The existing high-voltage cable online tension detector has poor environmental adaptability and limited detection position, resulting in large measurement error and difficulty in capturing the real stress state. In terms of environmental factors, in a high-temperature environment, the metal strain gauge or semiconductor material of the tension sensor changes due to the thermal expansion coefficient, resulting in additional stress between the strain gauge and the substrate, changing the resistance characteristics. At the same time, the parameters of internal circuit elements (such as capacitors and resistors) drift with temperature, causing deviations in signal amplification, filtering and other links. In a low-temperature environment, the material toughness decreases and the brittleness increases, which may cause the strain gauge welding point to crack and the semiconductor carrier mobility to decrease, further reducing the circuit sensitivity and seriously interfering with the detection accuracy.

[0004] In terms of detection position, the high-voltage cable is in a catenary state. According to the principle of mechanics, the tension at the insulator connection of the power tower is the maximum value of the whole section, and this part bears the tension of the whole section of the cable. However, the traditional tension detector is usually installed on the high-voltage cable and does not have fixed contact with the insulator of the power tower, which makes it impossible for the tension detector to accurately detect the real tension of the high-voltage cable between two power towers. It can only measure the tension data much lower than the actual extreme value, which greatly affects the effective evaluation of the safety state of the high-voltage cable, and may easily lead to high-voltage cable breakage accidents, affecting the effect of using the high-voltage cable online tension detector and the reliability of the high-voltage cable transmission power.

[0005] Therefore, a high-voltage cable online tension detector is proposed to solve the above problems. SUMMARY

[0006] The purpose of the application is to provide a high-voltage cable online tension detector to solve the above problems.

[0007] In order to achieve the above object, the following technical scheme is adopted in the present application: a high-voltage cable online tension detector, comprising a half wire clamp, a support block is fixedly connected to the top end of the half wire clamp, a protective box is fixedly sleeved to the top end of the support block, an extension rod is fixedly connected to the upper surface of the support block, two pull rings are fixedly connected to the top end of the extension rod, a tension sensing assembly is movably sleeved to the outer wall of the pull ring, a limiting mechanism is fixedly connected to the bottom end of the tension sensing assembly;

[0008] A top cover is fixedly connected to the top end of the protective box through a connecting bolt, an inner cover is fixedly connected to the inner wall of the top cover, a plurality of air permeation through holes are formed in the lower surface of the inner cover, a hollow frame is fixedly connected to the four side inner walls of the inner cover, a control mechanism is fixedly connected to the upper surface of the hollow frame;

[0009] An outdoor temperature interference resisting protection mechanism is fixedly connected to the inner wall of the hollow frame;

[0010] A limiting circular hole is formed in the side wall of the support block, and an opening groove is formed in the hole wall of the limiting circular hole, and a clamping mechanism is slidably connected to the groove wall of the opening groove.

[0011] In the above high-voltage cable online tension detector, the limiting mechanism comprises a steel wire rope fixedly connected to the bottom end of the tension sensing assembly, a fixed ring is fixedly connected to the bottom end of the steel wire rope, a hoop wire clamp is fixedly connected to the outer wall of the fixed ring, oval holes are formed in the two side outer walls of the protective box, a protection cylinder is fixedly connected to the hole wall of the oval hole, and a rubber sealing ring for cooperation with the steel wire rope is fixedly connected to the inner wall of the protection cylinder.

[0012] In the high-voltage cable online tension detector, the protection mechanism comprises two partition plates fixedly connected with the inner wall of the hollow frame, the side wall of the partition plate is fixedly connected with the inner wall of the inner cover, the outer wall of the two partition plates is provided with a fixing hole, the hole wall of the two fixing holes is fixedly connected with a vortex tube, the two partition plates divide the internal cavity of the hollow frame into a heating area, an air inlet area and a cooling area, the air inlet end of the vortex tube is located in the air inlet area, the upper surface of the hollow frame and the inner wall of the inner cover are fixedly connected with a sealing frame, the upper surface of the hollow frame inside the sealing frame is fixedly connected with an air pump, the upper surface of the hollow frame in the air inlet area is fixedly connected with a pressure valve, the bottom end inner wall of the inner cover is fixedly connected with a temperature and humidity sensing element, the bottom end of the protection box is fixedly connected with two waterproof air valves, the outer wall of the hollow frame in the heating area and the cooling area is respectively fixedly embedded with a hot three-way reversing control valve and a cold three-way reversing control valve, the bottom end outlet of the hot three-way reversing control valve and the cold three-way reversing control valve penetrates through the lower surface of the hollow frame, the lateral outlet of the hot three-way reversing control valve and the cold three-way reversing control valve penetrates through the outer wall of the inner cover, the outer wall of the inner cover and the protection box is provided with two symmetrically distributed exhaust holes, and the air inlet end of the air pump is fixedly connected with an air inlet assembly.

[0013] In the high-voltage cable online tension detector, the air inlet assembly comprises a first air pipe fixedly connected with the air inlet end of the air pump, the top end of the first air pipe penetrates through the upper surface of the top cover and is fixedly connected with an air inlet check valve, the top end of the first air pipe is provided with a filter cover, the bottom end of the filter cover is embeddedly fixed with the upper surface of the top cover, the side wall of the sealing frame is fixedly connected with a normally closed electromagnetic valve, the air outlet end of the normally closed electromagnetic valve is fixedly connected with a second air pipe, and the air outlet end of the second air pipe is fixedly connected with the pipe wall of the first air pipe.

[0014] In the high-voltage cable online tension detector, the control mechanism comprises a microcontroller and a 4G wireless communication module fixedly connected with the upper surface of the hollow frame, and the antenna top end of the 4G wireless communication module penetrates through the upper surface of the top cover.

[0015] In the high-voltage cable online tension detector, the clamping mechanism comprises a T-shaped clamping block, the outer wall of the T-shaped clamping block is provided with two screw holes, the hole wall of the screw hole is threadedly connected with a fixing bolt, and the outer wall of the supporting block is provided with two threaded blind holes matched with the fixing bolt.

[0016] In the high-voltage cable online tension detector, the protection box comprises a metal inner box embeddedly fixed with the top end of the supporting block, and the outer wall of the metal inner box is fixedly sleeved with a heat insulation outer cover.

[0017] In the high-voltage cable online tension detector, the bottom end of the inner cover is provided with a limiting groove matched with the top end of the extension rod, and the rod wall of the extension rod and the inner wall of the protection box are fixedly connected with a plurality of reinforcing rods.

[0018] Compared with the prior art, the high-voltage cable online tension detector has the advantages that:

[0019] 1. When the high-voltage cable needs to be detected, the high-voltage cable is placed in the limiting circular hole, and the clamping mechanism is used to limit the high-voltage cable, so that the protection box is fixed, and at the same time, the limiting mechanism is clamped on the high-voltage cable, so that the two tension sensing assemblies can effectively detect the tension of the high-voltage cable, and the tension sensing assembly converts the tension value into an electrical signal and sends it to the microcontroller, which processes the electrical signal and sends it to the power grid operation office through the 4G wireless communication module, so that the staff can know whether the tension of the high-voltage cable meets the safety range in time, and during the working process of the high-voltage cable online tension detector, the protection mechanism generates hot air and low-temperature air, which is used to adjust the temperature in the protection box, so that the temperature in the protection box is always maintained within the range of 15-25℃, ensuring that the tension sensing assembly can continuously and reliably detect the tension, avoiding the interference of the external temperature, and truly reflecting the tension of the high-voltage cable. The mechanism makes the high-voltage cable online tension detector have the function of detecting temperature regulation, improves the ability of the tension detector to resist outdoor environmental interference, effectively improves the protection ability of the detector with the protection box and the top cover, improves the accuracy of the tension detector for the online tension detection result of the high-voltage cable, and enables the staff to accurately understand the tension of the high-voltage cable in time, improves the effect of the high-voltage cable online tension detector, and ensures the reliability of the high-voltage cable power transmission.

[0020] 2. When the temperature and humidity sensing element detects that the humidity value in the protection box exceeds the initial humidity value preset by the microcontroller, the microcontroller controls the normally closed electromagnetic valve to be energized and opened according to the received electrical signal. At this time, the air pump can suck the air in the protection box without obstruction, and the air pressure in the protection box is reduced. At this time, the protection box sucks the external air through the waterproof air permeable valve and filters out the moisture in the external air. The relatively dry air enters the protection box, and the humidity of the air in the protection box is much lower than that of the outdoor air, so that the tension sensing assembly in the protection box is not affected by the high-humidity environment during the detection of the tension of the high-voltage cable, and even avoids the damage caused by the high-humidity environment. The mechanism makes the tension detector have the function of preventing damp interference during the online tension detection of the high-voltage cable, and further improves the protection ability of the tension detector.

[0021] 3, when the side end of the high-voltage cable needs to be detected, the tension detector is fixed on the power tower insulator through the half wire clamp, and the half wire clamp cooperates with the insulator to position the high-voltage cable, and the two hoop clamps of the tension detector are respectively limited and installed on the high-voltage cables on both sides of the insulator, that is, the two limiting mechanisms and the tension sensing assembly can detect the side end tension of the high-voltage cables on both sides of the power tower insulator at the same time, and the tension value detected by the tension sensing assembly is the total tension of the high-voltage cable between the two power towers, and the tension detection result of the high-voltage cable at this position is more accurate, the mechanism enables the high-voltage cable to have the function of multi-position tension detection, and can detect the tension of the high-voltage cable at two positions at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0023] Figure 2 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0024] Figure 3 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0025] Figure 4 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0026] Figure 5 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0027] Figure 6 is a structure schematic diagram of a high-voltage cable online tension detector provided by the application installed at the side end of a high-voltage cable;

[0028] In the figure: 1 half clamp, 2 support block, 3 protection box, 31 metal inner box, 32 heat insulation cover, 4 extension rod, 5 limit mechanism, 51 wire rope, 52 fixing ring, 53 clamp, 54 casing, 55 rubber sealing ring, 6 control mechanism, 61 microcontroller, 624G wireless communication module, 7 protection mechanism, 71 partition, 72 vortex tube, 73 heating zone, 74 air intake zone, 75 cooling zone, 76 sealing frame, 77 vacuum pump, 78 pressure valve, 79 temperature and humidity sensor element, 71 0 waterproof breathable valve, 711 hot three-way reversing control valve, 712 cold three-way reversing control valve, 713 exhaust through-hole, 8 air intake assembly, 81 first air pipe, 82 air intake one-way valve, 83 filter cover, 84 normally closed solenoid valve, 85 second air pipe, 9 clamping mechanism, 91 T-shaped clamping block, 92 fixing bolt, 93 threaded blind hole, 10 pull ring, 11 tension sensor assembly, 12 top cover, 13 inner cover, 14 breathable through-hole, 15 hollow frame, 16 limit circular hole, 17 limit groove, 18 reinforcement rod. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figures 1-6 As shown, a high-voltage cable online tension detector includes a half-clamp 1, the top of the half-clamp 1 is fixedly connected to a support block 2, the top of the support block 2 is fixedly sleeved with a protective box 3, the protective box 3 includes a metal inner box 31 embedded and fixed with the top of the support block 2, the outer wall of the metal inner box 31 is fixedly sleeved with a heat-insulating outer cover 32, the double-layer design of the protective box 3 not only has high strength, but also has the characteristics of heat insulation protection, reducing the interference of the external temperature environment, the upper surface of the support block 2 is fixedly connected to an extension rod 4, the top of the extension rod 4 is fixedly connected to two tension rods Ring 10, the outer wall of the pull ring 10 is movably connected with a tension sensing component 11, the bottom end of the tension sensing component 11 is fixedly connected to the limiting mechanism 5, the limiting mechanism 5 includes a steel wire rope 51 fixedly connected to the bottom end of the tension sensing component 11, the bottom end of the steel wire rope 51 is fixedly connected to a fixing ring 52, the outer wall of the fixing ring 52 is fixedly connected to a clamp 53, and elliptical holes are provided on the outer walls of both sides of the protective box 3, and the hole walls of the elliptical holes are fixedly connected to a protective tube 54, and the inner wall of the protective tube 54 is fixedly connected to a rubber sealing ring 55 for matching with the steel wire rope 51.

[0031] The top end of the protection box 3 is fixedly connected with a top cover 12 through connecting bolts, the inner wall of the top cover 12 is fixedly connected with an inner cover 13, a plurality of air permeation holes 14 are arranged on the lower surface of the inner cover 13, the four side inner walls of the inner cover 13 are fixedly connected with a hollow frame 15, a limiting groove 17 matched with the top end of the extension rod 4 is arranged on the bottom end of the inner cover 13, a plurality of reinforcing rods 18 are fixedly connected between the rod wall of the extension rod 4 and the inner wall of the protection box 3, the reinforcing rods 18 can improve the structural stability of the extension rod 4, ensure the stability when the tension sensing assembly 11 detects tension, and improve the accuracy of the tension detection result, the upper surface of the hollow frame 15 is fixedly connected with a control mechanism 6, the control mechanism 6 comprises a microcontroller 61 fixedly connected with the upper surface of the hollow frame 15 and a 4G wireless communication module 62, and the top end of the antenna of the 4G wireless communication module 62 penetrates through the upper surface of the top cover 12.

[0032] The inner wall of the hollow frame 15 is fixedly connected with a protection mechanism 7 against outdoor temperature interference, the protection mechanism 7 comprises two baffle plates 71 fixedly connected with the inner wall of the hollow frame 15, the side wall of the baffle plate 71 is fixedly connected with the inner wall of the inner cover 13, the outer wall of the two baffle plates 71 is provided with a fixed hole, and the hole walls of the two fixed holes are fixedly connected with a vortex tube 72, the two baffle plates 71 divide the internal cavity of the hollow frame 15 into a heating area 73, an air inlet area 74 and a cooling area 75, the air inlet end of the vortex tube 72 is located in the air inlet area 74, the upper surface of the hollow frame 15 and the inner wall of the inner cover 13 are fixedly connected with a sealing frame 76, the upper surface of the hollow frame 15 inside the sealing frame 76 is fixedly connected with a suction pump 77, the upper surface of the hollow frame 15 located in the air inlet area 74 is fixedly connected with a pressure valve 78, the bottom end inner wall of the inner cover 13 is fixedly connected with a temperature and humidity sensing element 79, the bottom end of the protection box 3 is fixedly connected with two waterproof air permeable valves 710, the outer walls of the hollow frame 15 located in the heating area 73 and the cooling area 75 are respectively fixedly embedded with a hot three-way reversing control valve 711 and a cold three-way reversing control valve 712, the bottom outlets of the hot three-way reversing control valve 711 and the cold three-way reversing control valve 712 all pass through the lower surface of the hollow frame 15, the lateral outlets of the hot three-way reversing control valve 711 and the cold three-way reversing control valve 712 all pass through the outer wall of the inner cover 13, the two side outer walls of the inner cover 13 and the protection box 3 are symmetrically provided with two exhaust through-holes 713, the air inlet end of the suction pump 77 is fixedly connected with an air inlet assembly 8, the air inlet assembly 8 comprises a first air pipe 81 fixedly connected with the air inlet end of the suction pump 77, the top end of the first air pipe 81 passes through the upper surface of the top cover 12 and is fixedly connected with an air inlet check valve 82, the top end of the first air pipe 81 is provided with a filter cover 83, the bottom end of the filter cover 83 is embedded and fixed with the upper surface of the top cover 12, the side wall of the sealing frame 76 is fixedly connected with a normally closed electromagnetic valve 84, the air outlet end of the normally closed electromagnetic valve 84 is fixedly connected with a second air pipe 85, and the air outlet end of the second air pipe 85 is fixedly connected with the pipe wall of the first air pipe 81. This mechanism enables the high-voltage cable to have the function of detecting temperature regulation in the tension detector, and improves the ability of the tension detector to resist outdoor environmental interference.

[0033] The side wall of the support block 2 is provided with a limiting circular hole 16, and the hole wall of the limiting circular hole 16 is provided with an open slot, and the slot wall of the open slot is slidably connected with a clamping mechanism 9, the clamping mechanism 9 comprises a T-shaped clamping block 91, the outer wall of the T-shaped clamping block 91 is provided with two screw holes, and the hole walls of the screw holes are threadedly connected with fixed bolts 92, and the outer wall of the support block 2 is provided with two threaded blind holes 93 matched with the fixed bolts 92. This mechanism can stably clamp and limit the high-voltage cable.

[0034] The temperature and humidity sensing element 79 and the tension sensing assembly 11 are electrically connected with the input end of the microcontroller 61 through wires, the 4G wireless communication module 62, the air suction pump 77, the hot three-way reversing control valve 711, the cold three-way reversing control valve 712 and the normally closed electromagnetic valve 84 are electrically connected with the output end of the microcontroller 61 through wires, and the power supply sources of the above-mentioned powered devices are the induction power generation devices on the power tower, and the above-mentioned powered elements and electrical connections are all prior arts, which will not be described here.

[0035] The operation principle of the present application is described as follows: when the online tension detection of the high-voltage cable is needed, the high-voltage cable is first placed in the limiting round hole 16 and limited by the clamping mechanism 9, the fixed bolt 92 is rotated, the T-shaped clamping block 91 is pressed against the high-voltage cable after the fixed bolt 92 is connected with the threaded blind hole 93, the purpose of fixing the protection box 3 is achieved, the two hoop cable clamps 53 are clamped on the high-voltage cable, and the steel wire rope 51 is taut, so that the two tension sensing assemblies 11 can effectively detect the tension of the high-voltage cable, the tension sensing assembly 11 converts the tension value into an electric signal and sends it to the microcontroller 61, the microcontroller 61 processes the electric signal, and finally the data detected by the tension sensing assembly 11 is sent to the power grid operation office through the 4G wireless communication module 62 through the microcontroller 61, so that the staff can know whether the tension of the high-voltage cable meets the safety range in time;

[0036] And in the process of high-voltage cable online tension detector, in the outdoor environment, if the temperature and humidity sensor element 79 detects the temperature in the protection box 3 exceeds the preset 25 degrees Celsius of the microcontroller 61, the microcontroller 61 controls the air pump 77 and the cold three-way reversing control valve 712 power on, the cold three-way reversing control valve 712 power on changes the air guide position, so that the low temperature air of the cooling area 75 is discharged through the bottom outlet of the cold three-way reversing control valve 712, the air pump 77 is powered on through the air inlet check valve 82 and the first air pipe 81 to suck the outside air, the outside air is filtered and purified through the filter cover 83, which avoids the impurities entering the inside of the high-voltage cable online tension detector to cause detection interference, then the air sucked by the air pump 77 is sent to the sealed frame 76, with the increase of the air injected into the sealed frame 76, the air pressure in the sealed frame 76 gradually increases, and forms high pressure air, when the air pressure in the sealed frame 76 reaches the pressure threshold of the pressure valve 78, the pressure valve 78 is turned on, at this time, because the air pump 77 sucks air to continuously inject into the sealed frame 76, so that the high pressure air source in the sealed frame 76 continuously enters the pressure valve 78, then the high pressure air enters the vortex tube 72 through the inlet of the vortex tube 72, at this time, the high pressure air flow accelerates and enters the vortex chamber of the vortex tube 72 tangentially, forming high speed rotating vortex, the outer layer airflow kinetic energy of the vortex chamber is converted into heat energy to form hot air (temperature above 35 degrees Celsius), the inner layer airflow kinetic energy decreases to form low temperature air (temperature below minus 8 degrees Celsius), the low temperature air blows into the bottom of the inner cover 13 and injects into the protection box 3 through the air permeable hole 14, and at this time, the hot air of the heating area 73 is discharged through the horizontal outlet of the hot three-way reversing control valve 711, which avoids the hot air causing temperature rise, and at this time, the temperature and humidity sensor element 79 detects the temperature in the protection box 3, if the temperature in the protection box 3 still exceeds the preset 25 degrees Celsius of the microcontroller 61, at this time, the microcontroller 61 controls the pumping power of the air pump 77 to gradually increase, so that the air pump 77 injects more high pressure air into the vortex tube 72, and the vortex tube 72 can produce more low temperature air into the protection box 3, which ensures that the temperature in the protection box 3 reaches below 25 degrees Celsius, finally the air in the protection box 3 is discharged through the two waterproof air valves 710;

[0037] In the outdoor environment, if the temperature in the protective box 3 is lower than 15 degrees Celsius preset by the microcontroller 61, the microcontroller 61 controls the air pump 77 and the hot three-way reversing control valve 711 to be powered on. Similarly, the hot three-way reversing control valve 711 is also powered on to change the air guide position, so that the hot air in the heating area 73 is discharged through the bottom outlet of the hot three-way reversing control valve 711. After the air pump 77 is powered on, the outside air is sucked through the air inlet check valve 82, the first air pipe 81 and the filter cover 83 and injected into the vortex tube 72. The hot air generated by the vortex tube 72 is transported to the protective box 3 through the hot three-way reversing control valve 711, which improves the temperature at the tension sensing assembly 11. At the same time, the low-temperature air in the cooling area 75 is discharged through the horizontal outlet of the cold three-way reversing control valve 712, avoiding the situation that the low-temperature air causes the temperature to continue to drop. At the same time, the temperature in the protective box 3 is detected by the temperature and humidity sensing element 79. If the temperature in the protective box 3 is still lower than 15 degrees Celsius preset by the microcontroller 61, the microcontroller 61 gradually controls the suction power of the air pump 77 to be improved by receiving the electrical signal of the temperature and humidity sensing element 79, so that the air pump 77 injects more high-pressure air into the vortex tube 72, and the vortex tube 72 can generate more hot air into the protective box 3, so that the temperature in the protective box 3 reaches more than 15 degrees Celsius. Finally, the air in the protective box 3 is discharged through the two waterproof air valves 710. Through the above temperature regulation, the temperature of the tension sensing assembly 11 in the protective box 3 is always maintained in the range of 15-25°C, avoiding the situation that the resistance characteristics of the metal strain gauge or semiconductor material of the tension sensing assembly 11 change due to the change of the thermal expansion coefficient, and avoiding the situation that the low temperature damages the tension sensing assembly 11, avoiding the interference of the outdoor temperature on the accuracy of the high-voltage cable tension detection, and reflecting the tension of the high-voltage cable. The mechanism enables the high-voltage cable on-line tension detector to have the function of temperature regulation, improves the ability of the tension detector to resist outdoor environmental interference, and cooperates with the protective box 3 and the top cover 12 to effectively improve the protection ability of the detector, and improves the accuracy of the tension detector for high-voltage cable on-line tension detection result, and enables the staff to accurately understand the tension of the high-voltage cable in time, improves the effect of the high-voltage cable on-line tension detector, and can guarantee the reliability of the high-voltage cable power transmission;

[0038] When the humidity value in the protective box 3 exceeds the initial humidity value preset by the microcontroller 61, the microcontroller 61 controls the normally closed electromagnetic valve 84 to be powered on according to the received electrical signal. At this time, when the air suction pump 77 sucks through the first air pipe 81, the normally closed electromagnetic valve 84 is opened, the second air pipe 85 sucks the air in the protective box 3 without obstruction, the first air pipe 81 preferentially sucks the air in the protective box 3 through the second air pipe 85, and the air pressure in the protective box 3 is reduced. At this time, the protective box 3 sucks the outside air through the waterproof air valve 710 and filters the moisture in the outside air. The relatively dry air enters the inside of the protective box 3, and the vortex tube 72 still transports hot air or low-temperature air to maintain the temperature in the protective box 3 within the temperature range preset by the microcontroller 61, and to ensure that the humidity in the protective box 3 is much lower than the outdoor air. When the tension sensing assembly 11 in the protective box 3 detects the tension of the high-voltage cable, it is not affected by the high-humidity environment, and even avoids being damaged by the high-humidity environment. This mechanism prevents the tension detector from being affected by moisture during online tension detection of the high-voltage cable, further improves the protection capability of the tension detector, and improves the accuracy of the online tension detection result of the tension detector.

[0039] When the tension of the side end of the high-voltage cable needs to be detected, the tension detector is fixed on the power tower insulator by the half wire clamp 1, and the half wire clamp 1 cooperates with the insulator to position the high-voltage cable. At the same time, the two hoop clamps 53 of the tension detector are respectively positioned and installed on the high-voltage cables on both sides of the insulator, that is, the two limiting mechanisms 5 and the tension sensing assembly 11 can simultaneously detect the side end tension of the high-voltage cables on both sides of the power tower insulator. Since the position detected by the tension detector is the position of the high-voltage cable close to the power tower insulator, and the high-voltage cable between the two power towers is in a catenary shape, the tension value detected by the tension sensing assembly 11 at this position is the total tension of the high-voltage cable between the two power towers. The detection result of the high-voltage cable tension at this position is more accurate. This mechanism enables the high-voltage cable to have a multi-position tension detection function in the online tension detector, and can simultaneously detect the tension of the high-voltage cables at two positions on the power tower insulator, and can improve the detection effect and accuracy.

[0040] The above only describes the preferred embodiments of the present application and does not 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. A high-voltage cable online tension detector, comprising a half clamp (1), characterized in that: The top end of the half-line clamp (1) is fixedly connected to a support block (2), the top end of the support block (2) is fixedly sleeved with a protective box (3), the upper surface of the support block (2) is fixedly connected to an extension rod (4), the top end of the extension rod (4) is fixedly connected to two pull rings (10), the outer wall of the pull ring (10) is movably sleeved with a tension sensor component (11), and the bottom end of the tension sensor component (11) is fixedly connected to a limiting mechanism (5); The top of the protection box (3) is fixedly connected to a top cover (12) by connecting bolts, the inner wall of the top cover (12) is fixedly connected to an inner cover (13), a lower surface of the inner cover (13) is provided with a plurality of ventilation holes (14), the four inner walls of the inner cover (13) are fixedly connected to a hollow frame (15), and the upper surface of the hollow frame (15) is fixedly connected to a control mechanism (6); The inner wall of the hollow frame (15) is fixedly connected with a protective mechanism (7) for resisting outdoor temperature interference; The side wall of the support block (2) is provided with a limiting circular hole (16), and the hole wall of the limiting circular hole (16) is provided with an open groove, and the groove wall of the open groove is slidably connected to a clamping mechanism (9).

2. The high-voltage cable online tension detector according to claim 1, characterized in that: The limiting mechanism (5) includes a steel wire rope (51) fixedly connected to the bottom end of the tension sensor assembly (11), the bottom end of the steel wire rope (51) is fixedly connected to a fixing ring (52), the outer wall of the fixing ring (52) is fixedly connected to a clamp (53), both sides of the outer wall of the protective box (3) are provided with an elliptical hole, and the hole wall of the elliptical hole is fixedly connected to a protective tube (54), and the inner wall of the protective tube (54) is fixedly connected to a rubber sealing ring (55) for matching with the steel wire rope (51).

3. The high-voltage cable online tension detector according to claim 1, characterized in that: The protection mechanism (7) includes two partitions (71) fixedly connected to the inner wall of the hollow frame (15), the side wall of the partition (71) is fixedly connected to the inner wall of the inner cover (13), the outer walls of the two partitions (71) are each provided with a fixing hole, and the hole walls of the two fixing holes are fixedly connected to a vortex tube (72), the two partitions (71) divide the internal cavity of the hollow frame (15) into a heating zone (73), an air intake zone (74) and a cooling zone (75), the air intake end of the vortex tube (72) is located in the air intake zone (74), the upper surface of the hollow frame (15) and the inner wall of the inner cover (13) are fixedly connected to a sealing frame (76), the upper surface of the hollow frame (15) located inside the sealing frame (76) is fixedly connected to an air pump (77), and the upper surface of the hollow frame (15) located in the air intake zone (74) is fixedly connected to a pressure valve (78) ), the inner wall of the bottom end of the inner cover (13) is fixedly connected with a temperature and humidity sensor element (79), the bottom end of the protective box (3) is fixedly connected with two waterproof breathable valves (710), the outer walls of the hollow frame (15) located in the heating area (73) and the cooling area (75) are respectively fixedly embedded with a hot three-way reversing control valve (711) and a cold three-way reversing control valve (712), the bottom outlets of the hot three-way reversing control valve (711) and the cold three-way reversing control valve (712) both pass through the lower surface of the hollow frame (15), the side outlets of the hot three-way reversing control valve (711) and the cold three-way reversing control valve (712) both pass through the outer wall of the inner cover (13), the outer walls on both sides of the inner cover (13) and the protective box (3) are jointly provided with two symmetrically distributed exhaust holes (713), and the air inlet end of the air pump (77) is fixedly connected with an air inlet component (8).

4. The high-voltage cable online tension detector according to claim 3, characterized in that: The air intake assembly (8) includes a first air pipe (81) fixedly connected to the air intake end of the air pump (77), the top end of the first air pipe (81) passes through the upper surface of the top cover (12) and is fixedly connected to an air intake check valve (82), a filter cover (83) is provided on the outer side of the top end of the first air pipe (81), the bottom end of the filter cover (83) is embedded and fixed with the upper surface of the top cover (12), the side wall of the sealing frame (76) is fixedly connected to a normally closed electromagnetic valve (84), the air outlet end of the normally closed electromagnetic valve (84) is fixedly connected to a second air pipe (85), and the air outlet end of the second air pipe (85) is fixedly connected to the pipe wall of the first air pipe (81).

5. The high-voltage cable online tension detector according to claim 1, characterized in that: The control mechanism (6) includes a microcontroller (61) and a 4G wireless communication module (62) fixedly connected to the upper surface of the hollow frame (15), and the top of the antenna of the 4G wireless communication module (62) passes through the upper surface of the top cover (12).

6. The high-voltage cable online tension detector according to claim 1, characterized in that: The clamping mechanism (9) comprises a T-shaped clamping block (91), the outer wall of the T-shaped clamping block (91) is provided with two screw holes, and the hole walls of the screw holes are threadedly connected with fixing bolts (92), and the outer wall of the support block (2) is provided with two threaded blind holes (93) that match the fixing bolts (92).

7. The high-voltage cable online tension detector according to claim 1, characterized in that: The protection box (3) comprises a metal inner box (31) embedded and fixed with the top end of the support block (2); the outer wall of the metal inner box (31) is fixedly sleeved with a heat-insulating outer cover (32).

8. The high-voltage cable online tension detector according to claim 1, characterized in that: The bottom end of the inner cover (13) is provided with a limiting groove (17) that matches the top end of the extension rod (4), and the rod wall of the extension rod (4) and the inner wall of the protection box (3) are fixedly connected with a plurality of reinforcing rods (18).

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