Inflatable high-voltage cable composite outdoor terminal and application method thereof

Abstract

The invention discloses an inflatable high-voltage cable composite outdoor terminal and an application method thereof.The terminal comprises a sleeve section and an end bin which are connected with each other, and the sleeve section is used for achieving electrical connection between an inflatable high-voltage cable and an overhead line; the end bin is used for achieving connection of the inflatable high-voltage cable and sealing of an inner cavity of the inflatable high-voltage cable, and the end bin is provided with a signal collecting device and an inflation connector used for inflating the interior of the end bin and the inner cavity of the inflatable high-voltage cable. A pressure sensor, a temperature sensor and a humidity sensor are arranged in the end bin and used for detecting the pressure, the temperature and the humidity of the interior of the end bin and the pressure, the temperature and the humidity of an inner cavity of the inflatable high-voltage cable, and the output ends of the pressure sensor, the temperature sensor and the humidity sensor are connected with the signal collecting device. The invention aims to solve the problem that only passive protection can be adopted for fire disasters and flood disasters of the high-voltage cable line, and the autonomous protection capability of the high-voltage cable and the intrinsic safety operation level of the high-voltage cable line are improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable protection technology, specifically to an air-filled high-voltage cable composite outdoor terminal and its application method. Background Technology

[0002] High-voltage cable lines are a crucial component of urban power grid safety systems, and their operational reliability is vital for maintaining the safety and stability of the urban power grid and ensuring the normal operation of urban functions. In terms of potential consequences, years of operational experience have shown that fires have the most severe impact, while floods have the most widespread. However, current cable laying processes are often characterized by rough handling, excessive force, and non-standard installation, frequently resulting in external damage to the cables. Poor drainage in tunnels leads to cables being submerged in water for extended periods, allowing moisture to penetrate and corrode the metal sheath. This can cause poor grounding and further cable corrosion, leading to operational failures that severely impact the stable operation of the line. Currently, the detection of external damage to high-voltage cable lines relies mainly on manual and robotic inspections; however, these methods, relying on visual observation or image analysis, suffer from low detection efficiency. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide an inflatable high-voltage cable composite outdoor terminal and its application method, which addresses the above-mentioned problems in the prior art. This invention aims to solve the problem that high-voltage cable lines can only be passively protected against fire and flood, and to improve the autonomous protection capability of high-voltage cables and the inherent safety level of high-voltage cable lines.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An inflatable high-voltage cable composite outdoor terminal includes an interconnected sleeve section and a terminal compartment. The sleeve section is used to realize the electrical connection between the inflatable high-voltage cable and the overhead line. The terminal compartment is used to realize the connection of the inflatable high-voltage cable and the sealing of the internal cavity of the inflatable high-voltage cable. The terminal compartment is equipped with a signal acquisition device and an inflation interface for inflating the interior of the terminal compartment and the internal cavity of the inflatable high-voltage cable. The terminal compartment is equipped with a pressure sensor, a temperature sensor, and a humidity sensor to detect the pressure, temperature, and humidity inside the terminal compartment and the internal cavity of the inflatable high-voltage cable. The output terminals of the pressure sensor, temperature sensor, and humidity sensor are respectively connected to the signal acquisition device.

[0005] Optionally, the sleeve section includes outgoing fittings, terminals, and a tail tube. The outgoing fittings are used to achieve electrical connection with external electrical equipment. The terminals are connected to and electrically connected to the conductor core of the gas-filled high-voltage cable by at least one of two methods: crimping and welding. The outgoing fittings and terminals are interconnected. A shield is provided on the side of the terminal near the outgoing fitting to prevent tip discharge. The tail tube is sleeved on the gas-filled high-voltage cable, and a stress cone assembly is provided between the tail tube and the outer wall of the gas-filled high-voltage cable to fix the tail tube to the outer wall of the gas-filled high-voltage cable. A sleeve is connected between the shield and the tail tube. The gas-filled high-voltage cable between the shield and the tail tube is inserted and arranged in the sleeve. Multiple supporting insulators are provided on the tail tube to support the tail tube.

[0006] Optionally, an inner conical tube is fixed on the tail tube. The inner conical tube is inserted into the sleeve and sleeved on the outside of the pneumatic high-voltage cable. The inner wall of the inner conical tube has an inner conical surface with a gradually decreasing diameter towards the terminal block. The stress cone assembly includes a connecting bolt, an annular push plate, and an outer conical tube. The connecting bolt is threaded to the tail tube and its end is movably connected to the annular push plate to adjust the pushing stroke of the annular push plate. One end of the outer conical tube contacts the annular push plate, and the other end has an outer conical surface. The outer conical surface is arranged between the outer wall of the pneumatic high-voltage cable and the inner conical surface of the inner conical tube and is complementary in shape to the inner conical surface. This is used to convert the pushing force of the annular push plate into a radial clamping force on the outer wall of the pneumatic high-voltage cable through the outer conical surface and the inner conical surface, thereby clamping and fixing the pneumatic high-voltage cable.

[0007] Optionally, the annular pusher plate has a gradually increasing inclined surface on the side facing the outer conical tube, and contacts the outer conical tube through this inclined surface to push the outer conical tube, so that the pushing force of pushing the outer conical tube can be decomposed into a pushing force along the axial direction of the inflatable high-voltage cable and a clamping force along the radial direction of the inflatable high-voltage cable.

[0008] Optionally, an insulating agent is filled between the inner wall of the sleeve and the outer wall of the gas-filled high-voltage cable.

[0009] Optionally, the outer wall of the sleeve is provided with a plurality of silicone rubber umbrella-shaped skirts arranged circumferentially.

[0010] Optionally, the end chamber has a lead seal layer at one end and a core sealing mechanism at the other end. The core conductor of the gas-filled high-voltage cable passes through the lead seal layer and the core sealing mechanism in sequence and is connected to the sleeve section. The outer wall of the end chamber is sealed to the metal sheath of the gas-filled high-voltage cable through a lead seal layer formed by the lead seal process. The core sealing mechanism is sleeved on the core conductor of the gas-filled high-voltage cable and is interference-fitted with the core conductor of the gas-filled high-voltage cable, so that the internal cavity of the gas-filled high-voltage cable is connected to the inner cavity of the end chamber and remains sealed.

[0011] Optionally, the end plate facing the sleeve section of the end chamber is provided with a tapered hole. The core sealing mechanism includes a slanted sealing cone, a pressure plate, a bolt, an elastic component, and a nut. The slanted sealing cone and the pressure plate are both annular structures sleeved on the outside of the pneumatic high-voltage cable. The slanted sealing cone is installed in the tapered hole and contacts the inner wall of the tapered hole through the inclined surface of the outer wall. The pressure plate is arranged on the outside of the slanted sealing cone. The bolt is threaded to the end plate of the end chamber and passes through the pressure plate and the elastic component before being threaded to the nut to apply pressure to the pressure plate, pushing the slanted sealing cone into the tapered hole and achieving a seal with the outer wall of the pneumatic high-voltage cable under the action of the inclined surface. The pressure plate is located inside the end chamber. The end plate facing the sleeve section of the end chamber is detachably connected to the end chamber.

[0012] Optionally, a pressure gauge is provided on the end chamber, and the pressure gauge is connected to a signal acquisition device to display the gas pressure inside the end chamber detected by a pressure sensor.

[0013] The present invention also provides an application method for the aforementioned pneumatic high-voltage cable composite outdoor terminal, comprising using pneumatic high-voltage cable composite outdoor terminals at both ends of the same pneumatic high-voltage cable to perform fault detection on the pneumatic high-voltage cable: The monitoring data sent periodically by the inflatable high-voltage cable composite outdoor terminal at both ends of the inflatable high-voltage cable is obtained. The monitoring data includes pressure, temperature, humidity and pressure relief time. The pressure relief time is the time when the inflatable high-voltage cable composite outdoor terminal detects that the pressure is lower than a preset threshold. Determine whether the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable meet the fault judgment conditions. The fault judgment conditions include that the pressure in the monitoring data is less than a preset pressure threshold, the humidity is greater than a preset humidity threshold, and the temperature exceeds a preset temperature threshold range. If the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable meet the fault judgment conditions, proceed to the next step; otherwise, determine that the inflatable high-voltage cable is faulty at one end and the fault is in an early stage and has not yet affected the other end, and end and exit. The time difference between the depressurization times in the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable is calculated. The time difference is multiplied by a preset airflow velocity of the inflatable high-voltage cable to obtain the distance difference. If the deviation between the distance difference and the length of the inflatable high-voltage cable is less than a preset threshold, it is determined that the outer sheath of the inflatable high-voltage cable is damaged, and the process ends and exits. Otherwise, it is determined that the end chamber at the end with the earlier depressurization time in the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable has leaked.

[0014] Compared with the prior art, the present invention can mainly achieve the following beneficial effects: 1. The present invention provides an air-filled high-voltage cable composite outdoor terminal that can use the air-filling interface of the end compartment to fill the interior of the end compartment and the internal cavity of the air-filled high-voltage cable with high-pressure fire extinguishing gas, such as nitrogen, carbon dioxide and some or all of inert gases. This can achieve moisture protection for the air-filled high-voltage cable and, in the event of a fire in the air-filled high-voltage cable, use the high-pressure fire extinguishing gas inside to extinguish the fire in time, thus achieving active fire extinguishing protection for the high-voltage cable body.

[0015] 2. The inflatable high-voltage cable composite outdoor terminal of this invention can detect the pressure, temperature, and humidity inside the terminal compartment and the internal cavity of the inflatable high-voltage cable, thus promptly sensing the damage to the inflatable high-voltage cable. This inflatable high-voltage cable composite outdoor terminal can be used to perform inflation verification after the high-voltage cable is laid inside, promptly identifying and resolving external cable damage. Furthermore, installing this inflatable high-voltage cable composite outdoor terminal can establish an autonomous protection system for the high-voltage cable itself. The gas is stored long-term inside the metal sheath, and the line's operating status can be understood at any time by monitoring changes in gas pressure, temperature, and humidity. This enables proactive monitoring of damage from external forces and fires, solving the problem that traditional high-voltage cable lines can only rely on passive protection against fires and floods, thereby enhancing the autonomous protection capability of the high-voltage cable itself and improving the inherent safety level of the high-voltage cable line. Attached Figure Description

[0016] Figure 1 This is a partial cross-sectional view of the outdoor terminal of the inflatable high-voltage cable according to an embodiment of the present invention.

[0017] Figure 2 This is a partial cross-sectional view of the casing section in an embodiment of the present invention.

[0018] Figure 3 This is a partial cross-sectional view of the end-cap compartment in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the basic process of the method in an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1As shown, the inflatable high-voltage cable composite outdoor terminal in this embodiment includes a sleeve section 1 and an end chamber 2 connected to each other. The sleeve section 1 is used to realize the electrical connection between the inflatable high-voltage cable and the overhead line. The end chamber 2 is used to realize the connection of the inflatable high-voltage cable and the sealing of the internal cavity of the inflatable high-voltage cable. The end chamber 2 is equipped with a signal acquisition device 3 and an inflation interface 21 for inflating the inside of the end chamber 2 and the internal cavity of the inflatable high-voltage cable. The end chamber 2 is equipped with a pressure sensor, a temperature sensor and a humidity sensor to detect the pressure, temperature and humidity inside the end chamber 2 and the internal cavity of the inflatable high-voltage cable. The output terminals of the pressure sensor, temperature sensor and humidity sensor are respectively connected to the signal acquisition device 3. The primary function of end chamber 2 is to isolate the high-pressure gas inside the cavity of the gas-filled high-voltage cable from the bushing section 1, preventing the high-pressure gas from affecting the insulation components inside the bushing section 1. End chamber 2 is connected to the internal cavity of the gas-filled high-voltage cable, and the gas inside the internal cavity is filled through the inflation port 21 on end chamber 2. For example, inert gas or other fire-extinguishing gases are filled in to maintain the dryness of the various layers inside the cable and prevent moisture from affecting the stable operation of the cable. The gas-filled high-voltage cable includes a conductor core, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a buffer layer, a metal sheath, and an outer sheath. The cavity inside the metal sheath forms the internal cavity of the gas-filled high-voltage cable. The signal acquisition device 3 can detect the pressure, temperature and humidity inside the end chamber 2 and the cavity inside the pneumatic high-voltage cable through pressure sensors, temperature sensors and humidity sensors. When the pneumatic high-voltage cable is ruptured, for example, if the pneumatic high-voltage cable is ruptured due to water immersion or fire, the gas at the rupture point of the metal sheath of the pneumatic high-voltage cable is released instantly. In the event of a flood, the pressure at the rupture point prevents water from entering the metal sheath of the pneumatic high-voltage cable. In the event of a fire, the release of fire extinguishing gas at the rupture point reduces the oxygen content in the space and reduces the impact range of the fire.

[0022] like Figure 2As shown, the sleeve section 1 in this embodiment includes a cable outlet fitting 11, a terminal block 12, and a tail pipe 18. The cable outlet fitting 11 is used to achieve electrical connection with external electrical equipment. The cable outlet fitting 11 is provided with bolt mounting holes for achieving electrical connection with external electrical equipment. The cable outlet fitting 11 can firmly connect the cable terminal to other electrical equipment (such as overhead lines), and has high conductivity and contact stability. The terminal block 12 is connected to the conductor of the gas-filled high-voltage cable by at least one of two methods: crimping and welding. The cable outlet fitting 11 and the terminal block 12 are interconnected. A shield 13 is provided on one side of the outlet fitting 11 to prevent tip discharge. The tail tube 18 is sleeved on the pneumatic high-voltage cable and a stress cone assembly 16 is provided between the tail tube 18 and the outer wall of the pneumatic high-voltage cable to fix the tail tube 18 to the outer wall of the pneumatic high-voltage cable. A sleeve 14 is connected between the shield 13 and the tail tube 18. The sleeve 14 can protect the pneumatic high-voltage cable inside. The pneumatic high-voltage cable between the shield 13 and the tail tube 18 is inserted and arranged in the sleeve 14. Multiple support insulators 17 are provided on the tail tube 18 to support the tail tube 18. The tail tube 18 provides the main sealing function for the sleeve 14.

[0023] like Figure 2 As shown, in this embodiment, an inner conical tube 181 is fixed on the tail tube 18. The inner conical tube 181 is inserted into the sleeve 14 and sleeved on the outside of the pneumatic high-voltage cable. The inner wall of the inner conical tube 181 is provided with an inner conical surface whose diameter gradually decreases towards the terminal 12. The stress cone assembly 16 includes a connecting bolt 161, an annular push plate 162 and an outer conical tube 163. The connecting bolt 161 is threaded to the tail tube 18 and its end is movably connected to the annular push plate 162 to adjust the pushing stroke of the annular push plate 162. One end of the outer conical tube 163 contacts the annular push plate 162 and the other end is provided with an outer conical surface. The outer conical surface is arranged between the outer wall of the pneumatic high-voltage cable and the inner conical surface of the inner conical tube 181 and is complementary to the shape of the inner conical surface. It is used to convert the pushing force of the annular push plate 162 into a radial clamping force on the outer wall of the pneumatic high-voltage cable through the outer conical surface and the inner conical surface, thereby clamping and fixing the pneumatic high-voltage cable.

[0024] like Figure 2 As shown, in this embodiment, the side of the annular pusher plate 162 facing the outer conical tube 163 is a gradually increasing slope, and the outer conical tube 163 is pushed through the contact of the slope, so that the pushing force of the outer conical tube 163 can be decomposed into a pushing force along the axial direction of the inflatable high-voltage cable and a clamping force along the radial direction of the inflatable high-voltage cable.

[0025] like Figure 2 As shown, in this embodiment, the space between the inner wall of the sleeve 14 and the outer wall of the gas-filled high-voltage cable is filled with an insulating agent 15.

[0026] like Figure 2As shown, the outer wall of the sleeve 14 in this embodiment is provided with a plurality of silicone rubber umbrella-shaped skirts 141 arranged circumferentially. In this embodiment, the silicone rubber umbrella-shaped skirts 141 are made of silicone insulating material with the following mass composition: 98 parts of vinyl silicone rubber raw rubber; 20 parts of gaseous silica; 50-60 parts of modified diatomaceous earth; 1-2 parts of silane coupling agent; 0.7 parts of silane peroxide; 3 parts of vulcanization accelerator; and 1-3 parts of vulcanizing agent. The silicone rubber umbrella-shaped skirts 141 are made together with the sleeve 14, and the preparation method is as follows: after fixing the sleeve 14 with a mold, the silicone rubber is mixed and extruded through a rubber extruder. The vulcanization temperature is set at 100°C and the time is 20 minutes to obtain the extruded finished product. The extruded finished product is transferred to a secondary vulcanization box, the ambient temperature is set at 170-180°C, and the vulcanization time is 3 hours to obtain the final finished product. The performance parameters of the molded silicone insulating material are as follows: density: 1.13 g / cm³; tear strength: 22~25 N / mm; Shore hardness: Shore A 28~39; elongation at break: ≥450%; breakdown strength: ≥22 kV / mm; dielectric loss: ≤0.003.

[0027] In this embodiment, the end chamber 2 is made of copper tubing, with a small copper tubing and mounting flange on one side for mounting the signal acquisition device 3. For example... Figure 3 As shown, in this embodiment, the end chamber 2 is provided with a lead seal layer 22 at one end and a core sealing mechanism 23 at the other end. The core conductor of the gas-filled high-voltage cable passes through the lead seal layer 22 and the core sealing mechanism 23 in sequence and is connected to the sleeve section 1. The outer wall of the end chamber 2 is sealed to the metal sheath of the gas-filled high-voltage cable through the lead seal layer 22 formed by the lead seal process. The core sealing mechanism 23 is sleeved on the core conductor of the gas-filled high-voltage cable and is interference-fitted with the core conductor of the gas-filled high-voltage cable, so that the internal cavity of the gas-filled high-voltage cable is connected to the inner cavity of the end chamber 2 and remains sealed. The steps for sealing the outer wall of the end chamber 2 with the metal sheath of the gas-filled high-voltage cable through a lead-sealing process to form a lead-sealing layer 22 are as follows: a. Peel off the outer sheath of the gas-filled high-voltage cable to expose the metal sheath; b. Use stearic acid blocks to melt the asphalt on the surface of the metal sheath; c. Clean the oxide layer on the surface of the metal sheath; d. Complete the lead coating on the corrugated surface of the metal sheath; e. Complete the bottom solder coating on the surface of the end chamber 2; f. Complete the lead sealing between the end chamber 2 and the metal sheath.

[0028] To achieve a reliable seal between the gas-filled high-voltage cable and the end chamber 2, and to ensure that the gas pressure does not affect the stress cone assembly 16 after the end chamber 2 is filled with gas at a certain pressure, thus preventing the gas pressure from affecting the improvement of electric field stress, as follows: Figure 3As shown, in this embodiment, the end plate of the end chamber 2 facing the sleeve section 1 has a tapered hole. The core sealing mechanism 23 includes a slanted sealing cone 231, a pressure plate 232, a bolt 233, an elastic component 234, and a nut 235. The slanted sealing cone 231 and the pressure plate 232 are both annular structures sleeved on the outside of the gas-filled high-voltage cable. The slanted sealing cone 231 is installed in the tapered hole and contacts the inner wall of the tapered hole through the slanted surface of the outer wall. The pressure plate 232 is arranged on the outside of the slanted sealing cone 231. The bolt 233 is threadedly connected to the end plate of the end chamber 2 and passes through the pressure plate 232 and the elastic component 234 before... The nut 235 is threaded to apply pressure to the pressure plate 232, pushing the oblique sealing cone 231 into the conical hole and achieving a seal with the outer wall of the gas-filled high-voltage cable under the action of the oblique surface. The pressure plate 232 is located inside the end chamber 2. The end plate of the end chamber 2 facing the sleeve section 1 is detachably connected to the end chamber 2. The end chamber 2 and the tail pipe 18 form a two-stage sealing chamber. The cable and the oblique sealing cone 231 achieve a seal separation between the two. At the same time, the tail of the end chamber 2 is sealed with the metal sheath of the cable by lead sealing, which can make the interior of the end chamber 2 withstand a maximum pressure of 0.4MPa without leakage.

[0029] As an optional implementation, the end chamber 2 in this embodiment is equipped with a pressure gauge, which is connected to the signal acquisition device 3 to display the gas pressure inside the end chamber 2 detected by the pressure sensor.

[0030] In this embodiment, the signal acquisition device 3 includes a signal acquisition circuit, a processor, a 4G signal transmission module, and a battery module. The battery module is connected to the signal acquisition circuit, the processor, and the 4G signal transmission module. The battery module uses a lithium battery and has a charging interface on the end chamber 2. The output terminals of the pressure sensor, temperature sensor, and humidity sensor are connected to the signal acquisition circuit of the signal acquisition device 3. The copper tube signal acquisition circuit performs analog-to-digital conversion. The pressure gauge is connected to the processor. The signal acquisition circuit, processor, and 4G signal transmission module are connected in sequence to output the acquired data to the copper tube via the 4G network. This enables the detection and data transmission of air pressure, signal, and gas content within the chamber. The 4G signal transmission module facilitates background monitoring and timely detection of abnormalities within the cable. Furthermore, in this embodiment, the end chamber 2 is also equipped with a pressure relief valve to prevent damage to the equipment due to excessive pressure.

[0031] In summary, the gas-filled high-voltage cable composite outdoor terminal of this embodiment can significantly improve the autonomous protection level of high-voltage cable lines, achieving enhanced fire and water resistance without relying on external means, improving the monitoring capability of cable line operation status, and effectively ensuring the safe and stable operation of cables and channels. By replacing traditional waterproof or fireproof and explosion-proof shells with internal gas filling of the cable's metal sheath, the waterproof and fire-resistant properties brought about by the release of gas pressure enhance the cable's inherent protective capabilities. Simultaneously, the signal acquisition device provides more intuitive feedback on the cable's current status by separately monitoring changes in gas pressure and temperature / humidity, effectively promoting the construction of an autonomous protection system for high-voltage cable lines and improving the ability to respond to fire, water, and external damage during high-voltage cable maintenance. Traditional fire prevention mainly relies on external wrapping with fire-resistant tape for passive fire protection, but tape protection cannot achieve comprehensive coverage and often only protects certain weak points. This embodiment of the inflatable high-voltage cable composite outdoor terminal changes the traditional passive fire prevention model that relies on external facilities and equipment by inflating the cable internally, thus transforming passive fire prevention into active fire prevention. It enables comprehensive active fire protection for the cable line, solving the technical problem of improving the autonomous fire protection capability of high-voltage cables and significantly improving the fire protection level of cable lines. On the other hand, it has water-blocking capability, using pressurized gas inside the cable to prevent the intrusion of external moisture, which can solve the technical problem of improving the autonomous waterproof capability of high-voltage cables, avoiding typical latent hidden dangers such as buffer layer erosion defects caused by moisture, and effectively improving the moisture resistance of the cable line itself when it is submerged in water for a long time.

[0032] like Figure 4 As shown, the application method of the inflatable high-voltage cable composite outdoor terminal in this embodiment includes using the inflatable high-voltage cable composite outdoor terminals at both ends of the same inflatable high-voltage cable to perform fault detection on the inflatable high-voltage cable: S101, acquire monitoring data sent periodically by the inflatable high-voltage cable composite outdoor terminal at both ends of the inflatable high-voltage cable. The monitoring data includes pressure, temperature, humidity and pressure relief time. The pressure relief time is the time when the inflatable high-voltage cable composite outdoor terminal detects that the pressure is lower than a preset threshold. S102, determine whether the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable meet the fault judgment conditions. The fault judgment conditions include the pressure in the monitoring data being less than a preset pressure threshold, the humidity being greater than a preset humidity threshold, and the temperature exceeding a preset temperature threshold range. If the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable meet the fault judgment conditions, then proceed to step S103; otherwise, determine that the inflatable high-voltage cable is faulty at one end and the fault is in an early stage and has not yet affected the other end, then end and exit. S103, calculate the time difference between the depressurization times in the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable. Multiply the time difference by a preset airflow velocity of the inflatable high-voltage cable to obtain the distance difference. If the deviation between the distance difference and the length of the inflatable high-voltage cable is less than a preset threshold, it is determined that the outer sheath of the inflatable high-voltage cable is damaged, and the process ends and exits. Otherwise, it is determined that the end chamber 2 at the end with the earlier depressurization time in the monitoring data sent by the composite outdoor terminals of the inflatable high-voltage cable at both ends of the inflatable high-voltage cable has leaked. When the end chamber 2 on one side leaks, the gas inside the end chamber 2 begins to leak, causing the pressure detected by the signal acquisition device 3 at the other end to gradually decrease. Eventually, the signal acquisition device 3 at the other end will also initially determine that the inflatable high-voltage cable is damaged. Therefore, the damage to the inflatable high-voltage cable and the leakage of the end chamber 2 can be quickly and accurately determined based on the magnitude of the time difference.

[0033] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An air-filled high-voltage cable composite outdoor termination, characterized in that, The utility model provides a kind of inflatable high-voltage cable terminal head, including mutually connected sleeve section (1) and end head warehouse (2), the sleeve section (1) is used to realize the electrical connection of inflatable high-voltage cable with overhead line, the end head warehouse (2) is used to realize the connection of inflatable high-voltage cable and the closure of inflatable high-voltage cable internal cavity, signal acquisition device (3) and inflatable interface (21) for the internal and inflatable high-voltage cable internal cavity of end head warehouse (2) are provided on the end head warehouse (2), pressure sensor, temperature sensor and humidity sensor are arranged in the end head warehouse (2), to detect the pressure, temperature and humidity of the internal and inflatable high-voltage cable internal cavity of end head warehouse (2), the output of pressure sensor, temperature sensor and humidity sensor is connected with signal acquisition device (3) respectively.

2. The gas-filled high-voltage cable composite outdoor termination of claim 1, characterized in that The sleeve section (1) includes outgoing line hardware (11), terminal post (12) and tail pipe (18), the outgoing line hardware (11) is used to realize the electrical connection with external electrical equipment, the terminal post (12) is connected and electrically connected with the core conductor of inflatable high-voltage cable by at least one of the two ways of crimping and electric welding, the outgoing line hardware (11) and terminal post (12) are connected with each other, the side of terminal post (12) close to outgoing line hardware (11) is provided with shield cover (13) to prevent the generation of sharp tip discharge, the tail pipe (18) is sleeved on inflatable high-voltage cable and is provided with stress cone assembly (16) between the outer wall of inflatable high-voltage cable for fixing tail pipe (18) to the outer wall of inflatable high-voltage cable, sleeve (14) is connected between shield cover (13) and tail pipe (18), the inflatable high-voltage cable between shield cover (13) and tail pipe (18) is arranged in sleeve (14), a plurality of supporting insulators (17) are provided on tail pipe (18) to support tail pipe (18).

3. The gas-filled high-voltage cable composite outdoor termination of claim 2, wherein, The tail pipe (18) is fixed with inner taper pipe (181), the inner taper pipe (181) is arranged in sleeve (14) and is sleeved on the outside of inflatable high-voltage cable, the inner wall of inner taper pipe (181) is provided with inner taper surface that gradually reduces in caliber towards the side of terminal post (12), the stress cone assembly (16) includes connecting bolt (161), annular push plate (162) and outer taper pipe (163), the connecting bolt (161) is threadedly connected with tail pipe (18) and is movably connected with annular push plate (162) at end portion to adjust the push travel of annular push plate (162), the outer taper pipe (163) is in contact with annular push plate (162) at one end and is provided with outer taper surface at the other end, the outer taper surface is arranged between the outer wall of inflatable high-voltage cable and the inner taper surface of inner taper pipe (181) and is complementary to the shape of inner taper surface, to convert the pushing force of annular push plate (162) into radial clamping force to inflatable high-voltage cable outer wall through outer taper surface and inner taper surface, and then clamp and fix inflatable high-voltage cable.

4. The gas-filled high-voltage cable composite outdoor termination of claim 3, wherein, The side of the annular push plate (162) towards the outer cone tube (163) is a gradually increasing slope, and the push plate (162) contacts the outer cone tube (163) through the slope to push the outer cone tube (163), so that the pushing force of the outer cone tube (163) can be decomposed into a pushing force along the axial direction of the inflatable high-voltage cable and a clamping force along the radial direction of the inflatable high-voltage cable.

5. The gas-filled high-voltage cable composite outdoor termination of claim 2, wherein, An insulating agent (15) is filled between the inner wall of the sleeve (14) and the outer wall of the inflatable high-voltage cable.

6. The gas-filled high-voltage cable composite outdoor termination of claim 2, wherein, A plurality of silicone rubber umbrella skirts (141) are arranged on the outer wall of the sleeve (14) in the circumferential direction.

7. The gas-filled high-voltage cable composite outdoor termination of claim 1, wherein, The end head warehouse (2) is provided with a lead seal layer (22) at one end and a wire core sealing mechanism (23) at the other end. The wire core conductor of the inflatable high-voltage cable passes through the lead seal layer (22) and the wire core sealing mechanism (23) in sequence and is connected to the sleeve segment (1). The outer wall of the end head warehouse (2) is sealingly connected to the lead seal layer (22) formed by the lead sealing process between the metal sheath of the inflatable high-voltage cable. The wire core sealing mechanism (23) is sleeved on the wire core conductor of the inflatable high-voltage cable and is in interference fit with the wire core conductor of the inflatable high-voltage cable, so that the internal cavity of the inflatable high-voltage cable of the inflatable high-voltage cable is in communication with the inner cavity of the end head warehouse (2) and remains sealed.

8. The gas-filled high-voltage cable composite outdoor termination of claim 7, characterized in that The side of the end head warehouse (2) towards the sleeve segment (1) is provided with a conical hole on the end plate. The wire core sealing mechanism (23) includes an inclined sealing cone (231), a pressing plate (232), a bolt (233), an elastic component (234), and a nut (235). The inclined sealing cone (231) and the pressing plate (232) are both annular structures sleeved on the outside of the inflatable high-voltage cable. The inclined sealing cone (231) is installed in the conical hole and contacts the inner wall of the conical hole through the slope of the outer wall. The pressing plate (232) is arranged on the outside of the inclined sealing cone (231). The bolt (233) is threadedly connected to the end plate of the end head warehouse (2), passes through the pressing plate (232) and the elastic component (234), and is threadedly connected to the nut (235) to apply pressure to the pressing plate (232), push the inclined sealing cone (231) into the conical hole, and realize sealing with the outer wall of the inflatable high-voltage cable under the action of the slope. The pressing plate (232) is located on the inside of the end head warehouse (2). The side of the end head warehouse (2) towards the sleeve segment (1) is detachably connected to the end head warehouse (2).

9. The gas-filled high-voltage cable composite outdoor termination of claim 1, wherein, A pressure gauge is provided on the end head warehouse (2), and the pressure gauge is connected to the signal acquisition device (3) to display the gas pressure inside the end head warehouse (2) detected by the pressure sensor.

10. 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high-voltage cable is one-end fault and the fault is in an early stage and has not affected the other end, ending and exiting; calculating the time difference between the pressure relief times in the monitoring data sent by the composite outdoor terminal of the gas-filled high-voltage cable at both ends of the gas-filled high-voltage cable, multiplying the time difference by a preset gas flow speed of the gas-filled high-voltage cable to obtain a distance difference, and if the distance difference and the length of the gas-filled high-voltage cable have a deviation less than a preset threshold, then determining that the outer sheath of the gas-filled high-voltage cable is damaged, ending and exiting; otherwise, determining that the end head chamber (2) of the end with the earlier pressure relief time in the monitoring data sent by the composite outdoor terminal of the gas-filled high-voltage cable at both ends of the gas-filled high-voltage cable leaks.

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