Cable intermediate joint with online monitoring function

Abstract

The present invention provides a cable intermediate joint with an online monitoring function, comprising an insulating tube body, a conductor connecting tube, a temperature sensor, a composite sensor and a matching controller. The insulating tube body has a tube cavity, and both ends of the insulating tube body are respectively provided with connection holes that are connected to the tube cavity and for the cable to pass through. The insulating tube body is provided with an embedding hole that is connected to the tube cavity. The conductor connecting tube is arranged in the tube cavity, and both ends of the conductor connecting tube are respectively connected to two cable connectors. The temperature sensor is connected to one of the cables and can monitor the operating temperature and humidity of the cable. The composite sensor is inserted in the embedding hole, and the composite sensor has a monitoring end extending to the tube cavity. The composite sensor can monitor parameters such as partial discharge and voltage amplitude, frequency, and waveform data. The cable intermediate joint with an online monitoring function provided by the present invention can effectively avoid interference from external electromagnetic waves, accurately determine the degree of aging of the insulating material, have good monitoring effect, and strong practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of cable joint monitoring, and in particular relates to a cable intermediate joint with an online monitoring function. Background Art

[0002] Cable transmission systems play a vital role in the field of energy transmission. As one of the core components of the power cable transmission system, the cable intermediate joint connects different sections of cables and is responsible for transmitting electricity. However, due to the complexity of the cable transmission system and the uncertainty of the external environment, the cable intermediate joint is easily affected by various factors, thus becoming a weak link in the system. The fault points of the cable system are often concentrated at the location of the intermediate joint, mostly due to aging of the connection materials, poor electrical connection, environmental factors and other reasons. Therefore, in order to ensure the safe and reliable operation of the cable system, staff usually need to conduct regular inspections, troubleshoot potential fault points and perform necessary maintenance. The failure of the cable intermediate joint is mainly caused by electrical aging caused by partial discharge, thermal aging caused by heavy cable operating load, and damage from external mechanical forces.

[0003] In the prior art, there are pulse current method, ultra-high frequency method and ultrasonic method for detecting partial discharge. However, none of the above methods can be built into the cable intermediate joint, and the sensor can only be installed outside the intermediate joint. The environment of the cable intermediate joint will be interfered by various electromagnetic waves, resulting in large measurement data errors, and no accurate values ​​can be obtained. It is also impossible to determine the degree of insulation material aging caused by partial discharge through data analysis, and the monitoring effect is poor and the practicality is poor. Summary of the invention

[0004] The embodiment of the present invention provides a cable intermediate joint with an online monitoring function, aiming to solve the problem of poor practicability of the existing intermediate cable joint due to poor effect of monitoring the aging degree of insulating materials.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a cable intermediate joint with an online monitoring function, comprising:

[0006] The insulating tube body has a tube cavity, and both ends of the insulating tube body are respectively provided with connection holes that are connected to the tube cavity and for the cable to pass through; the insulating tube body is provided with an embedding hole that is connected to the tube cavity;

[0007] A conductor connecting tube is arranged in the tube cavity, and two ends of the conductor connecting tube are respectively connected to two cable connectors;

[0008] a temperature sensor connected to one of the cables for monitoring the operating temperature and humidity of the cable;

[0009] A composite sensor is inserted into the embedding hole, the composite sensor has a monitoring end extending to the tube cavity, and the composite sensor is used to monitor parameters such as partial discharge and voltage amplitude, frequency, waveform data, etc.;

[0010] Matching controller.

[0011] In a possible implementation, an electrode layer is covered on the inner wall surface of the lumen, and a plurality of conductive sheets are fixedly connected to the electrode layer. The conductive sheets are arranged in annular intervals around the central axis of the lumen, and each conductive sheet abuts against the outer wall surface of the conductor connecting tube.

[0012] In a possible implementation, a stress tube is provided in each of the connection holes, each of the stress tubes is sleeved on a corresponding cable, and each of the stress tubes extends into the tube cavity and contacts the electrode layer.

[0013] In a possible implementation manner, the diameter of the lumen is greater than the diameter of the connecting hole.

[0014] In a possible implementation, the temperature sensor is a passive wireless temperature measurement sensor sleeved on a cable.

[0015] In a possible implementation, the composite sensor includes:

[0016] Install the top cover;

[0017] A semiconductor column is fixedly connected to the mounting top cover, the semiconductor column is used to be inserted into the embedding hole, and a sealed space is provided in the semiconductor column; one end of the semiconductor column extending into the tube cavity is the monitoring end;

[0018] A sensor body is disposed in the sealed space, and the sensor body is electrically connected to the controller;

[0019] The power supply module is arranged on one of the cables and is electrically connected to the sensor body and the controller.

[0020] In a possible implementation, the insulating tube body includes:

[0021] The main pipe has a cylindrical shape, and conical portions are provided at both ends of the main pipe; the lumen and the connecting hole are both located in the main pipe;

[0022] The auxiliary pipe is fixed on the main pipe, the axis of the auxiliary pipe is perpendicular to the axis of the main pipe, and the inner hole of the auxiliary pipe is the embedding hole.

[0023] In a possible implementation manner, a honeycomb layer is provided in a side wall of the main pipe, and the honeycomb layer is filled with a fire extinguishing agent.

[0024] In a possible implementation, the cable intermediate joint with online monitoring function further includes:

[0025] A first spring, sleeved on the auxiliary tube, one end of the first spring abutting against the mounting top cover;

[0026] There are two pull ropes, which are respectively arranged on both sides of the cable, one end of each pull rope is connected to the semiconductor column, and the other end passes through the side wall of the insulating tube body along the length direction of the embedding hole and is fixed by a wire clamp, and the two pull ropes are used to melt after a fire occurs in the tube cavity;

[0027] The fire extinguishing structure is arranged on the outer wall of the insulating tube body and is connected to the auxiliary tube. It is used to inject fire extinguishing agent into the tube cavity through the embedding hole after the first spring ejects the composite sensor out of the embedding hole.

[0028] In a possible implementation, the fire extinguishing structure includes:

[0029] A spiral tube is spirally fixed around the outer wall of the insulating tube body, one end of the spiral tube is fixedly connected to the auxiliary tube, the spiral tube has a spiral channel connected to the embedding hole, and the other end of the spiral tube is detachably connected to a sealing cover;

[0030] A piston is slidably disposed in the spiral channel to separate the spiral channel into a fire extinguishing agent storage chamber and a power chamber communicated with the embedding hole;

[0031] The second spring is arranged in the power chamber and abuts against the piston.

[0032] In this implementation, the tube cavity provided by the insulating tube body can ensure the protection of the conductor connection tube and the joint part of the two cables. The monitoring ends of the temperature sensor and the composite sensor are both located in the tube cavity. This structure can effectively prevent the two from being interfered by external electromagnetic waves, and can directly and accurately measure the parameters in the tube cavity, which can effectively determine the aging degree of the insulating material, with good monitoring effect and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic cross-sectional view of a cable intermediate joint with an online monitoring function provided by an embodiment of the present invention Figure 1 ;

[0034] Figure 2 A schematic diagram of the insulating tube structure of a cable intermediate joint with an online monitoring function provided by an embodiment of the present invention;

[0035] Figure 3A schematic cross-sectional view of a cable intermediate joint with an online monitoring function provided by an embodiment of the present invention Figure 2 ;

[0036] Figure 4 for Figure 3 The AA structural diagram of the cable intermediate joint with online monitoring function shown in FIG.

[0037] Description of reference numerals:

[0038] 10. Insulating tube body; 11. Tube cavity; 12. Electrode layer; 13. Conductive sheet; 14. Mounting hole; 15. Main tube; 16. Auxiliary tube; 17. Stress tube; 18. Honeycomb layer;

[0039] 20. Conductor connecting tube;

[0040] 30. Temperature sensor;

[0041] 40. Composite sensor; 41. Install the top cover; 42. Semiconductor column; 43. Sensor body; 44. Power supply module;

[0042] 50. Controller;

[0043] 60. First spring;

[0044] 70. Pull rope;

[0045] 80. Fire extinguishing structure; 81. Spiral tube; 82. Piston; 83. Second spring;

[0046] 90. Cable. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] The introduction of advanced cable joint fault monitoring technology can more accurately monitor the status of the cable intermediate joints, improve the fault detection capability of the cable bookstore system, reduce the accident rate, and reduce the labor intensity of the staff. By real-time monitoring of key parameters of the cable intermediate joints, such as humidity, temperature, local discharge point and voltage (amplitude, frequency, waveform data), using advanced data analysis and processing methods, potential fault signs can be identified in advance, providing timely warning information for staff.

[0049] Please also read Figure 1, the cable intermediate joint with online monitoring function provided by the present invention is now described. The cable intermediate joint with online monitoring function includes an insulating tube body 10, a conductor connecting tube 20, a temperature sensor 30, a composite sensor 40 and a matching controller 50. The insulating tube body 10 has a tube cavity 11, and both ends of the insulating tube body 10 are respectively provided with connection holes that are connected to the tube cavity 11 and for the cable 90 to pass through. The insulating tube body 10 is provided with an embedding hole 14 that is connected to the tube cavity 11. The conductor connecting tube 20 is arranged in the tube cavity 11, and both ends of the conductor connecting tube 20 are respectively connected to two cable 90 connectors. The temperature sensor 30 is connected to one of the cables 90 and can monitor the operating temperature and humidity of the cable 90. The composite sensor 40 is inserted in the embedding hole 14, and the composite sensor 40 has a monitoring end extending to the tube cavity 11. The composite sensor 40 can monitor parameters such as partial discharge and voltage amplitude, frequency, and waveform data.

[0050] Compared with the prior art, the cable intermediate joint with online monitoring function provided in this embodiment has a tube cavity 11 provided by the insulating tube body 10, which can ensure the protection of the conductor connecting tube 20 and the joint part of the two cables 90. The monitoring ends of the temperature sensor 30 and the composite sensor 40 are both located in the tube cavity 11. This structure can effectively prevent the two from being interfered by external electromagnetic waves, and can directly and accurately measure the parameters in the tube cavity 11, which can effectively determine the aging degree of the insulating material, with good monitoring effect and strong practicality.

[0051] In this embodiment, the controller 50 may include a wireless data transmission module to ensure that the monitored data is sent to the terminal device in real time or at intervals. This technology is existing technology and will not be described in detail here.

[0052] In some embodiments, the insulating tube body 10 may be formed as follows: Figure 1 See the structure shown. Figure 1 The inner wall surface of the tube cavity 11 is covered with an electrode layer 12, and a plurality of conductive sheets 13 are fixedly connected to the electrode layer 12. The conductive sheets 13 are arranged in annular intervals around the central axis of the tube cavity 11, and each conductive sheet 13 abuts against the outer wall surface of the conductor connecting tube 20. The arrangement of the electrode layer 12 and the conductive sheets 13 can ensure electrical contact with the conductor connecting tube 20, which can ensure that an equipotential body is formed in the tube cavity 11.

[0053] In order to avoid the stress of individual conductive sheets 13 being large due to the eccentricity between the conductor connecting tube 20 and the lumen 11, or the individual conductive sheets 13 being unable to release the conductor connecting tube 20, the conductive sheets 13 can be arranged in a fan shape, and a fan-shaped through-hole is arranged inside the conductive sheets 13. In this case, the conductive sheets 13 have a certain deformation ability, thereby ensuring stable contact with the conductor connector.

[0054] In some embodiments, the connection holes may be Figure 1 See the structure shown. Figure 1 Each connection hole is provided with a stress tube 17, each stress tube 17 is sleeved on the corresponding cable 90, each stress tube 17 extends into the tube cavity 11, and contacts the electrode layer 12. The stress tube 17 can not only evacuate the concentrated electric field at the outer shielding layer port of the cable 90, but also evacuate the concentrated electric field at the electrode layer 12 port in the tube cavity 11, achieving a double evacuation effect, greatly reducing the hidden dangers caused by the concentrated electric field at the inner electrode layer 12 port.

[0055] In some embodiments, the insulating tube body 10 may be formed as follows: Figure 1 See the structure shown. Figure 1 The diameter of the lumen 11 is larger than the diameter of the connection hole. This structure ensures that the conductor of the cable 90 in the lumen 11 can be connected in a variety of ways, ensuring the space utilization of the cable 90 connection, and also avoiding the electrical connection of the cable 90 affecting the electrode layer 12 and causing the distortion of the electric field.

[0056] In some embodiments, the temperature sensor 30 may be a Figure 1 See the structure shown. Figure 1 The temperature sensor 30 is a passive wireless temperature sensor mounted on the cable 90. The passive wireless temperature sensor can be mounted on the cable 90, can directly measure the temperature of the cable 90 harness, and can timely feedback the temperature in the lumen 11, and can directly transmit the data to the controller 50. This technology is a prior art and will not be described in detail here.

[0057] In some embodiments, the composite sensor 40 may be used as follows: Figure 1 See the structure shown. Figure 1 The composite sensor 40 includes a mounting cover 41, a semiconductor column 42, a sensor body 43, and a power supply module 44. The semiconductor column 42 is fixedly connected to the mounting cover 41, and the semiconductor column 42 can be inserted into the embedding hole 14, and a sealed space is provided in the semiconductor column 42. One end of the semiconductor column 42 extending into the lumen 11 is a monitoring end. The sensor body 43 is disposed in the sealed space, and the sensor body 43 is electrically connected to the controller 50. The power supply module 44 is disposed on one of the cables 90, and is electrically connected to the sensor body 43 and the controller 50.

[0058] The installation of the top cover 41 is convenient for taking and convenient for being clamped at the opening of the embedding hole 14. In addition, the installation of the top cover 41 can also ensure the fixed installation of the controller 50. The semiconductor column 42 is plugged into the embedding hole 14. The semiconductor column 42 can evacuate the concentrated electric field around the sensor and the opening of the Faraday cage, reducing the attenuation of the fault signal. The power supply module 44 can mainly provide power for the controller 50 and the sensor body 43. The power supply module 44 can be composed of a coil laid on a flat plate of flexible magnetic conductive material, wrapped on one of the cables 90, and the magnetic field changes generated in space by the alternating current transmitted by the cable 90 generate voltage and current, thereby realizing self-power supply. This technology is a prior art and will not be described in detail here.

[0059] In some embodiments, the insulating tube body 10 may be formed as follows: Figure 2 See the structure shown. Figure 2 The insulating tube body 10 includes a main tube 15 and an auxiliary tube 16. The main tube 15 is a cylindrical structure, and conical portions are provided at both ends of the main tube 15. The tube cavity 11 and the connecting hole are both located in the main tube 15. The auxiliary tube 16 is fixedly mounted on the main tube 15, and the axis of the auxiliary tube 16 is perpendicular to the axis of the main tube 15, and the inner hole of the auxiliary tube 16 is an embedded hole 14.

[0060] The provision of the auxiliary pipe 16 can ensure that the wall thickness of the main pipe 15 is reduced, while ensuring the depth of the embedding hole 14.

[0061] It should be noted that the auxiliary tube 16 needs to be located at the top during use, and the axis of the mounting hole 14 thereof needs to be arranged along the vertical direction.

[0062] In some embodiments, the insulating tube body 10 may be formed as follows: Figure 3 See the structure shown. Figure 3 The side wall of the main pipe 15 is provided with a honeycomb layer 18, which is filled with a fire extinguishing agent. When a fire occurs inside and the electrode layer 12 is burned, the fire extinguishing agent in the honeycomb layer 18 will directly enter the tube cavity 11, playing a certain role in extinguishing the fire. In addition, the setting of the honeycomb layer 18 can also ensure the strength of the support, and can ensure the structural strength of the main pipe 15.

[0063] In some embodiments, see Figure 3 to Figure 4The cable intermediate joint with online monitoring function also includes a first spring 60, a pull rope 70 and a fire extinguishing structure 80. The first spring 60 is sleeved on the auxiliary tube 16, and one end of the first spring 60 is in contact with the mounting top cover 41. Two pull ropes 70 are provided, and the two pull ropes 70 are respectively arranged on both sides of the cable 90. One end of each pull rope 70 is connected to the semiconductor column 42, and the other end passes through the side wall of the insulating tube body 10 along the length direction of the embedding hole 14 and is fixed by a wire clamp. The two pull ropes 70 can be melted after a fire occurs in the tube cavity 11. The fire extinguishing structure 80 is arranged on the outer wall of the insulating tube body 10 and is connected to the auxiliary tube 16. After the first spring 60 pops the composite sensor 40 out of the embedding hole 14, the fire extinguishing agent can be injected into the tube cavity 11 through the embedding hole 14.

[0064] When a fire breaks out inside the tube cavity 11, the temperature of the tube cavity 11 rises. At this time, in order to prevent the fire in the tube cavity 11 from spreading, the pull rope 70 will be disconnected under the baking of the open flame, and then the first spring 60 will pop the composite sensor 40 assembly out of the embedding hole 14 through the mounting top plate. Then the fire extinguishing structure 80 works, injecting the fire extinguishing agent into the tube cavity 11 through the embedding hole 14, so as to achieve fire fighting in the tube cavity 11, and the safety effect is good.

[0065] In some embodiments, the fire extinguishing structure 80 may be implemented as follows: Figure 3 to Figure 4 See the structure shown. Figure 3 to Figure 4 The fire extinguishing structure 80 includes a spiral tube 81, a piston 82 and a second spring 83. The spiral tube 81 is spirally fixed around the outer wall of the insulating tube body 10, one end of the spiral tube 81 is fixedly connected to the auxiliary tube 16, the spiral tube 81 has a spiral channel connected to the embedding hole 14, and the other end of the spiral tube 81 is detachably connected to the sealing cover. The piston 82 is slidably arranged in the spiral channel to separate the spiral channel into a fire extinguishing agent storage chamber and a power chamber connected to the embedding hole 14. The second spring 83 is arranged in the power chamber and abuts against the piston 82.

[0066] When the composite sensor 40 is located in the embedding cavity, one end of the storage cavity is blocked, and the piston 82 cannot push the fire extinguishing agent. At this time, the fire extinguishing agent is stationary in the storage cavity, and the second spring 83 is in a compressed state. When the composite sensor 40 is ejected, the storage cavity is in an open state, and the second spring 83 pushes the piston 82 to move, thereby pushing the fire extinguishing agent out of the storage cavity. The fire extinguishing agent then enters the tube cavity 11 through the embedding hole 14 to extinguish the fire in the tube cavity 11.

[0067] The fire extinguishing agent may be a dry powder fire extinguishing agent, which is a prior art and will not be described in detail here.

[0068] In addition, the spiral tube 81 can further increase the ring stiffness of the insulating tube body 10 to ensure structural strength, and the filling of the fire extinguishing agent inside the spiral tube 81 can be carried out at the sealing cover, the corresponding piston 82 and the second spring 83 can be taken out, and the piston 82 and the second spring 83 are fixedly connected.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable intermediate joint with online monitoring function, characterized in that: include: The insulating tube body has a tube cavity, and the two ends of the insulating tube body are respectively provided with connection holes that are connected to the tube cavity and for the cable to pass through; the insulating tube body is provided with an embedding hole that is connected to the tube cavity; the insulating tube body includes a main tube and an auxiliary tube; the main tube has a cylindrical shape structure, and the two ends of the main tube are provided with conical parts; the tube cavity and the connection hole are both located in the main tube; the auxiliary tube is fixed on the main tube, the axis of the auxiliary tube is perpendicular to the axis of the main tube, and the inner hole of the auxiliary tube is the embedding hole; A conductor connecting tube is arranged in the tube cavity, and two ends of the conductor connecting tube are respectively connected to two cable connectors; a temperature sensor connected to one of the cables for monitoring the operating temperature and humidity of the cable; A composite sensor is inserted into the embedding hole, the composite sensor has a monitoring end extending to the tube cavity, and the composite sensor is used to monitor the amplitude, frequency, waveform data and other parameters of partial discharge and voltage; the composite sensor includes a mounting top cover, a semiconductor column, a sensor body and a power supply module; the semiconductor column is fixedly connected to the mounting top cover, the semiconductor column is used to be inserted into the embedding hole, and a sealed space is provided in the semiconductor column; one end of the semiconductor column extending into the tube cavity is the monitoring end; the sensor body is arranged in the sealed space; the power supply module is arranged on one of the cables; A matching controller for electrical connection between the sensor body and the power supply module; A first spring, sleeved on the auxiliary tube, one end of the first spring abutting against the mounting top cover; There are two pull ropes, which are respectively arranged on both sides of the cable, one end of each pull rope is connected to the semiconductor column, and the other end passes through the side wall of the insulating tube body along the length direction of the embedding hole and is fixed by a wire clamp, and the two pull ropes are used to melt after a fire occurs in the tube cavity; The fire extinguishing structure is arranged on the outer wall of the insulating tube body and is connected to the auxiliary tube. It is used to inject fire extinguishing agent into the tube cavity through the embedding hole after the first spring ejects the composite sensor out of the embedding hole.

2. The cable intermediate joint with online monitoring function as claimed in claim 1, characterized in that: The inner wall surface of the tube cavity is covered with an electrode layer, and a plurality of conductive sheets are fixedly connected to the electrode layer. The conductive sheets are arranged in annular intervals around the central axis of the tube cavity, and each conductive sheet abuts against the outer wall surface of the conductor connecting tube.

3. The cable intermediate joint with online monitoring function as claimed in claim 2, characterized in that: A stress tube is arranged in each of the connection holes, each of the stress tubes is sleeved on a corresponding cable, each of the stress tubes extends into the tube cavity and contacts the electrode layer.

4. The cable intermediate joint with online monitoring function according to any one of claims 1 to 3, characterized in that: The diameter of the lumen is greater than the diameter of the connecting hole.

5. The cable intermediate joint with online monitoring function as claimed in claim 1, characterized in that: The temperature sensor is a passive wireless temperature measuring sensor sleeved on a cable.

6. The cable intermediate joint with online monitoring function as claimed in claim 1, characterized in that: A honeycomb layer is provided in the side wall of the main pipe, and the honeycomb layer is filled with a fire extinguishing agent.

7. The cable intermediate joint with online monitoring function as claimed in claim 1, characterized in that: The fire extinguishing structure comprises: A spiral tube is spirally fixed around the outer wall of the insulating tube body, one end of the spiral tube is fixedly connected to the auxiliary tube, the spiral tube has a spiral channel connected to the embedding hole, and the other end of the spiral tube is detachably connected to a sealing cover; A piston is slidably disposed in the spiral channel to separate the spiral channel into a fire extinguishing agent storage chamber and a power chamber communicated with the embedding hole; The second spring is arranged in the power chamber and abuts against the piston.

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