Monitoring device for monitoring cable connection state

Abstract

The invention belongs to the technical field of cable fault monitoring, and particularly discloses a monitoring device for monitoring a cable connection state. According to the monitoring device, the first temperature measuring sensor is arranged on the outer side of the connecting pipe and used for acquiring the temperature of the local position of the cable, and the second temperature measuring sensor is used for acquiring the temperature in the inner cavity of the cable joint, so that the temperature of the joint of the two cables is detected in an omnibearing manner; therefore, the more accurate measurement temperature of the cable connector is obtained, the error of temperature measurement is reduced, and the accuracy of monitoring the state of the cable connector is improved. Besides, the temperature measurement driving assembly drives the mounting ring to rotate relative to the cavity wall of the inner cavity of the cable connector, so that the position of the second temperature measurement sensor is adjusted, the temperature detection position of the second temperature measurement sensor is changed, the device is suitable for different application scenes, the use flexibility of the monitoring device is improved, and the temperature measurement error is reduced. And the accuracy of monitoring the state of the cable connector is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable fault monitoring, and in particular to a monitoring device for monitoring the connection status of a cable. Background Art

[0002] With the rapid development of urbanization, the degree of urban cable networking has increased rapidly. Underground cables have become the main component of urban power grids, and higher requirements have been put forward for the original management model.

[0003] According to incomplete statistics, about 70% of cable failures are joint failures, including quality problems of joint accessories, installation defects, environmental (water, dust, etc.) influences, local heating during heavy load operation in extreme weather such as severe cold or hot weather, accelerated thermal aging of accessories and reduced insulation performance, which may induce breakdown failures under certain conditions. Therefore, it is necessary to conduct real-time online monitoring of cable joints to achieve the overall goals of safe management, reliable operation and quantitative management of power grids.

[0004] The existing temperature detection of cable connection joints is generally composed of a built-in temperature measurement module, an external temperature measurement relay, a non-closed mutual inductance power supply and a cable status monitoring box. The built-in temperature measurement module obtains power while collecting temperature, and sends the temperature data to the external temperature measurement relay in a wireless manner to achieve real-time measurement of the conductor temperature of the cable connection joint. However, the temperature measurement module in the prior art can only collect the temperature of one point at the cable connection joint, and the temperature measurement is not universal, and it is difficult to represent the status of the entire cable connection joint. Summary of the invention

[0005] The object of the present invention is to provide a monitoring device for monitoring the cable connection status, which improves the accuracy of temperature measurement at the cable connection joint, reduces the error of temperature measurement, and thus improves the accuracy of cable connection joint status monitoring.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A monitoring device for monitoring the connection status of a cable, wherein the cable joint is used to connect two cables, the cable joint has a cable joint inner cavity, and a connecting tube for connecting two cable cores is arranged in the cable joint inner cavity, the monitoring device comprises a built-in temperature measurement system, and the built-in temperature measurement system comprises:

[0008] A first temperature measuring module is arranged in the inner cavity of the cable connector, the first temperature measuring module comprises at least one first temperature measuring sensor, and the first temperature measuring sensor is arranged outside the connecting pipe;

[0009] A second temperature measurement module is disposed in the inner cavity of the cable connector, and the second temperature measurement module includes at least one second temperature measurement sensor;

[0010] The temperature measurement drive module includes a mounting ring, which is rotatably connected to the cavity wall of the cable connector inner cavity. The second temperature measurement sensor is arranged on the mounting ring, and the mounting ring is connected to a temperature measurement drive component that drives the mounting ring to rotate.

[0011] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the temperature measurement drive assembly includes a bevel gear ring, a bevel gear and an adjusting rod, the bevel gear ring is arranged on the mounting ring, the bevel gear is meshed with the bevel gear ring, one end of the adjusting rod is fixedly connected to the bevel gear, and the other end of the adjusting rod is used to be rotated by force.

[0012] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the outer wall of the cable connector is recessed with a recessed groove, the other end of the adjusting rod passes through the cavity wall of the inner cavity of the cable connector and is provided with a force-applying part, the force-applying part is placed in the recessed groove, the side wall of the force-applying part is sleeved with a sealing member, the sealing member is pressed against the inner wall of the recessed groove, and the adjusting rod is threadedly connected to the cavity wall of the inner cavity of the cable connector.

[0013] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the monitoring device also includes a fixing system, which includes a fixed airbag and an airbag control module. The fixed airbag is arranged in the inner cavity of the cable connector and is sleeved on the outside of the connecting tube and the two cable cores. The airbag control module is arranged on the outside of the cable connector. The airbag control module is connected to the fixed airbag, and the airbag control module is configured to inflate or deflate the fixed airbag. The inflated fixed airbag is used to fix the first temperature sensor on the outside of the connecting tube, and fix the second temperature sensor on the cavity wall of the inner cavity of the cable connector.

[0014] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the airbag control module includes:

[0015] An air storage box is arranged outside the cable connector;

[0016] A partition plate is slidably disposed in the air storage box, and the partition plate divides the air storage box into a first cavity and a second cavity;

[0017] A connecting tube connecting the first cavity and the fixed airbag;

[0018] A driving member is arranged outside the air storage box, one end of the driving member passes through the air storage box and is placed in the second cavity, and the driving member is connected to the partition plate, and the driving member is used to drive the partition plate to slide.

[0019] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the connecting pipe is spirally wound around the outside of the cable connector, and a heating element is provided in the first cavity.

[0020] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the monitoring device also includes a temperature-sensitive optical fiber system, and the temperature-sensitive optical fiber system includes:

[0021] A temperature measuring optical fiber is arranged in the cable and in contact with the cable core;

[0022] A wavelength division multiplexer, connected to the temperature measuring optical fiber, and used for collecting the backscattered signal of the temperature measuring optical fiber;

[0023] A laser, connected to the wavelength division multiplexer, and used to provide a pulse signal for the wavelength division multiplexer;

[0024] A signal detector, connected to the wavelength division multiplexer, and used for receiving a signal from the wavelength division multiplexer or sending a signal to the wavelength division multiplexer;

[0025] The control module is connected to the signal detector and is used to collect and analyze the signal of the signal detector.

[0026] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the monitoring device also includes a cable partial discharge monitoring system, and the cable partial discharge monitoring system includes:

[0027] A capacitive partial discharge sensor is provided, wherein at least one capacitive partial discharge sensor is arranged in the inner cavity of the cable connector and is placed on the cable, and the capacitive partial discharge sensor is used to collect a discharge signal of the cable;

[0028] At least one inductive partial discharge sensor is provided and is arranged in the inner cavity of the cable connector. The inductive partial discharge sensor is used to collect the discharge signal of the cable.

[0029] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the inductive partial discharge sensor is arranged on the fixed airbag.

[0030] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection status, the monitoring device also includes a sodar identification system, which is arranged on the cable connector and is used to collect and analyze surface noise.

[0031] Beneficial effects of the present invention:

[0032] The present invention provides a monitoring device for monitoring the connection status of a cable, wherein a first temperature sensor is arranged on the outside of a connecting pipe, the first temperature sensor is used to obtain the temperature at a local position of the cable, and the second temperature sensor is used to obtain the temperature in an inner cavity of a cable joint, thereby realizing all-round detection of the temperatures at the two cable connection points, so as to obtain a more accurate measurement temperature at the cable connection joint, reduce the error in temperature measurement, and thereby improve the accuracy of monitoring the status of the cable connection joint; in addition, the temperature measurement drive component drives the mounting ring to rotate relative to the cavity wall of the inner cavity of the cable joint, thereby realizing adjustment of the position of the second temperature sensor, so as to change the position where the second temperature sensor detects the temperature, which is suitable for different application scenarios, improves the flexibility of using the monitoring device, reduces the error in temperature measurement, and improves the accuracy of monitoring the status of the cable connection joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a monitoring device for monitoring a cable connection status provided by an embodiment of the present invention;

[0034] Figure 2 is a structural schematic diagram of a built-in temperature measurement system provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of a fixing system provided by an embodiment of the present invention;

[0036] Figure 4 is a schematic structural diagram of a temperature-sensitive optical fiber system provided by an embodiment of the present invention;

[0037] Figure 5 It is a structural block diagram of a monitoring device for monitoring the cable connection status provided by an embodiment of the present invention.

[0038] In the figure:

[0039] 100, cable connector; 101, inner cavity of cable connector; 102, connecting tube; 103, voltage equalizing sleeve; 200, cable; 201, cable core;

[0040] 1. Built-in temperature measurement system; 2. Fixing system; 3. Temperature sensing optical fiber system; 4. Cable partial discharge monitoring system; 5. Sodar identification system; 6. Remote monitoring platform;

[0041] 11. First temperature measurement module; 111. First temperature measurement sensor; 12. Second temperature measurement module; 121. Second temperature measurement sensor; 13. Temperature measurement drive module; 131. Mounting ring; 132. Temperature measurement drive assembly; 1321. Bevel gear ring; 1322. Bevel gear; 1323. Adjustment rod; 1324. Force application part; 14. Temperature measurement relay module; 15. Temperature measurement monitoring host; 16. Power supply;

[0042] 21. Fixed airbag; 22. Airbag control module; 221. Air storage box; 222. Partition plate; 223. Connecting pipe; 224. Driving member;

[0043] 31. Temperature measuring optical fiber; 32. Wavelength division multiplexer; 33. Laser; 34. Signal detector; 35. Control module;

[0044] 41. Capacitive partial discharge sensor; 42. Inductive partial discharge sensor; 43. Partial discharge relay module; 44. Partial discharge monitoring host. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] like Figure 1As shown, two cables 200 are connected by a cable connector 100, which has a cable connector inner cavity 101. A connecting tube 102 connecting the two cable cores 201 is provided in the cable connector inner cavity 101. A pressure equalizing sleeve 103 is provided on the outer cover of the connecting tube 102. The pressure equalizing sleeve 103 seals the connecting gap between the connecting tube 102 and the insulating skin of the cable core 201.

[0050] like Figure 1 and Figure 2 As shown, this embodiment provides a monitoring device for monitoring the cable connection status, and the monitoring device is used to monitor whether there is a fault defect at the connection between two cables 200. The monitoring device includes a built-in temperature measurement system 1, and the built-in temperature measurement system 1 includes a first temperature measurement module 11, a second temperature measurement module 12 and a temperature measurement drive module 13. The first temperature measurement module 11 is arranged in the inner cavity 101 of the cable connector, and the first temperature measurement module 11 includes at least one first temperature measurement sensor 111, and the first temperature measurement sensor 111 is arranged outside the connecting pipe 102. The second temperature measurement module 12 is arranged in the inner cavity 101 of the cable connector, and the second temperature measurement module 12 includes at least one second temperature measurement sensor 121. The temperature measurement drive module 13 includes a mounting ring 131, and the mounting ring 131 is rotatably connected to the cavity wall of the inner cavity 101 of the cable connector, and the second temperature measurement sensor 121 is arranged on the mounting ring 131, and the mounting ring 131 is connected to a temperature measurement drive component 132 that drives the mounting ring 131 to rotate.

[0051] The first temperature sensor 111 is arranged on the outside of the connecting tube 102. The first temperature sensor 111 is used to obtain the temperature at a local position of the cable, and the second temperature sensor 121 is used to obtain the temperature in the inner cavity 101 of the cable connector, thereby realizing all-round detection of the temperature at the connection between the two cables 200, so as to obtain a more accurate measurement temperature at the cable connector, reduce the error of temperature measurement, and thus improve the accuracy of cable connector status monitoring; in addition, the temperature measurement drive component 132 drives the mounting ring 131 to rotate relative to the cavity wall of the cable connector inner cavity 101, thereby realizing the adjustment of the position of the second temperature sensor 121, so as to change the position where the second temperature sensor 121 detects the temperature, which is suitable for different application scenarios, improves the flexibility of the use of the monitoring device, reduces the error of temperature measurement, and improves the accuracy of cable connector status monitoring.

[0052] In order to improve the accuracy of temperature detection in the cable connector 100, the first temperature measuring module 11 includes at least two first temperature measuring sensors 111, and each cable core 201 is respectively provided with at least one first temperature measuring sensor 111. Preferably, the first temperature measuring sensor 111 is arranged on the outside of the connecting tube 102 and is sleeved on the outside of the cable core 201.

[0053] At least two second temperature measuring sensors 121 are arranged at intervals along the circumferential direction of the mounting ring 131 to improve the accuracy of temperature detection in the cable connector 100 .

[0054] Optionally, the temperature measurement drive assembly 132 includes a bevel gear ring 1321, a bevel gear 1322 and an adjustment rod 1323. The bevel gear 1322 ring is arranged on the mounting ring 131. Specifically, the bevel gear ring 1321 can be an integral structure with the mounting ring 131, that is, bevel teeth are machined along the circumference of the mounting ring 131 to form the bevel gear ring 1321 structure, or the bevel gear ring 1321 and the mounting ring 131 are a split structure, that is, the bevel gear ring 1321 is a ring with bevel teeth, and the bevel gear ring 1321 is connected to the mounting ring 131 by bolts or welding, which is not specifically limited here. The bevel gear 1322 is meshedly connected with the bevel gear ring 1321, one end of the adjustment rod 1323 is fixedly connected with the bevel gear 1322, and the other end of the adjustment rod 1323 is used to be rotated by force. Screwing the adjusting rod 1323 can drive the bevel gear 1322 to rotate around its own axis, and the rotation of the bevel gear 1322 drives the bevel gear ring 1321 to rotate, and then drives the installation ring 131 to rotate, so as to adjust the position of the second temperature sensor 121. The temperature measurement drive module 13 has a simple structure and can be installed in accordance with the structure of the cable connector inner cavity 101.

[0055] Further optionally, the other end of the adjusting rod 1323 passes through the cavity wall of the cable connector inner cavity 101 and is placed on the outside of the cable connector 100, and the adjusting rod 1323 is screwed with the cavity wall of the cable connector inner cavity 101. By screwing the other end of the adjusting rod 1323, the adjusting rod 1323 rotates relative to the cable connector 100, thereby driving the bevel gear 1322 to rotate around its own axis. A recessed groove is recessed on the outer wall of the cable connector 100, and a force-applying portion 1324 is provided at the other end of the adjusting rod 1323. The force-applying portion 1324 is placed in the recessed groove, and a sealing member is sleeved on the side wall of the force-applying portion 1324, which is pressed against the inner wall of the recessed groove. The force-applying portion 1324 is used to connect a component that applies an external force to screw the adjusting rod 1323. The force-applying portion 1324 is arranged in the recessed groove and does not affect the burial of the cable 200. The provision of the sealing member ensures the sealing of the cable connector 100 , and external impurities and the like will not enter the cable connector 100 through the gap between the adjustment rod 1323 and the side wall of the cable connector 100 .

[0056] The end surface of the force applying portion 1324 is concavely provided with a force applying groove, and the adjusting rod 1323 can be rotated by applying external force to the force applying groove. Specifically, the external force applied to the adjusting rod 1323 can be a motor or a manual wrench, etc., which is not specifically limited here.

[0057] The built-in temperature measurement system 1 also includes a temperature measurement relay module 14, a temperature measurement monitoring host 15 and a power supply 16. The first temperature measurement sensor 111 and the second temperature measurement sensor 121 are electrically connected to the temperature measurement relay module 14 respectively, the temperature measurement relay module 14 is electrically connected to the temperature measurement monitoring host 15, the power supply 16 provides power to the temperature measurement monitoring host 15, the temperature measurement monitoring host 15 communicates with the remote monitoring platform 6, and the temperature detected by the first temperature measurement sensor 111 and the second temperature measurement sensor 121 is provided to the remote monitoring platform 6 in real time through the temperature measurement monitoring host 15, thereby realizing real-time monitoring of the temperature at the cable joint 100.

[0058] The temperature measurement relay module 14 and the temperature measurement monitoring host 15 are existing technologies, and the power supply 16 is a non-closed mutual inductance power supply, which converts the electromagnetic energy around the single-phase cable into stable electrical energy, thereby providing a stable and reliable power supply for the temperature measurement monitoring host 15.

[0059] like Figure 1 and Figure 3 As shown, in some embodiments, the monitoring device further includes a fixing system 2, and the fixing system 2 includes a fixing airbag 21 and an airbag control module 22. The fixing airbag 21 is arranged in the inner cavity 101 of the cable connector and is sleeved on the outside of the connecting tube 102 and the two cable cores 201. The airbag control module 22 is arranged on the outside of the cable connector 100. The airbag control module 22 is connected to the fixing airbag 21. The airbag control module 22 is configured to inflate or deflate the fixing airbag 21. The inflated fixing airbag 21 is used to fix the first temperature sensor 111 on the outside of the connecting tube 102, and fix the second temperature sensor 121 on the cavity wall of the inner cavity 101 of the cable connector. When the fixing airbag 21 is deflated, there is a gap between the fixing airbag 21 and the inner wall of the inner cavity 101 of the cable connector, and the second temperature measuring module 12 can be placed in the inner cavity 101 of the cable connector. When the fixed airbag 21 is inflated, the fixed airbag 21 is pressed against the inner wall of the cable connector inner cavity 101, and the second temperature sensor 121 is fixed, so that the second temperature sensor 121 can be pressed against the cavity wall of the cable connector inner cavity 101. At the same time, the fixed airbag 21 can also play a shock-absorbing role for each component, so that the cable connector 100 is connected more stably and is less affected by the external environment.

[0060] Optionally, the airbag control module 22 includes an air storage box 221, a partition plate 222, a connecting pipe 223 and a driving member 224. The air storage box 221 is arranged outside the cable connector 100, and the partition plate 222 is slidably arranged inside the air storage box 221. The partition plate 222 separates the air storage box 221 to form a first cavity and a second cavity. The connecting pipe 223 connects the first cavity and the fixed airbag 21. The driving member 224 is arranged outside the air storage box 221, and one end of the driving member 224 passes through the air storage box 221 and is placed in the second cavity. The driving member 224 is connected to the partition plate 222, and the driving member 224 is used to drive the partition plate 222 to slide. The size of the first cavity and the second cavity is changed by moving the partition plate 222. When the first cavity becomes larger, the air pressure in the fixed airbag 21 becomes smaller, and the fixed airbag 21 no longer presses against the cavity wall of the cable connector cavity 101 and the various components in the cable connector cavity 101. When the first cavity becomes smaller, the air pressure in the inner cavity of the fixed airbag 21 increases, and then the driving member 224 drives the partition plate 222 to slide to achieve inflation and deflation of the fixed airbag 21 .

[0061] The connecting pipe 223 is spirally wound around the outside of the cable connector 100. The spirally wound connecting pipe 223 can increase its contact area with the air or soil and improve the cooling efficiency. A heating element is provided in the first cavity, and the heating element can heat the air in the first cavity. The heating element and the connecting pipe 223 can adjust the temperature in the cable connector 100 so that the temperature in the cable connector 100 is closer to the temperature required for use.

[0062] like Figure 4 and Figure 5 As shown, in some embodiments, the monitoring device further includes a temperature sensing optical fiber system 3, which includes a temperature measuring optical fiber 31, a wavelength division multiplexer 32, a laser 33, a signal detector 34 and a control module 35. The temperature measuring optical fiber 31 is arranged in the cable 200 and contacts the cable core 201. The wavelength division multiplexer 32 is connected to the temperature measuring optical fiber 31, and is used to collect the backscattered signal of the temperature measuring optical fiber 31. The laser 33 is connected to the wavelength division multiplexer 32, and the laser 33 is used to provide a pulse signal to the wavelength division multiplexer 32. The signal detector 34 is connected to the wavelength division multiplexer 32, and the signal detector 34 is used to receive the signal of the wavelength division multiplexer 32 or send a signal to the wavelength division multiplexer 32. The control module 35 is connected to the signal detector 34, and the control module 35 is used to collect and analyze the signal of the signal detector 34. The control module 35 is connected to the remote monitoring platform 6 for communication, and the control module 35 transmits the signal of the analysis signal detector 34 to the remote monitoring platform 6, thereby realizing real-time monitoring of the temperature at the cable joint 100. The control module 35 is also electrically connected to the laser 33, and is used to control the laser 33 to provide a pulse signal for the wavelength division multiplexer 32. Further, the control module 35 is electrically connected to a drive circuit, and the drive circuit is electrically connected to the laser 33. The control module 35 drives the laser 33 through the drive circuit to provide a pulse signal for the wavelength division multiplexer 32.

[0063] Using the temperature measuring optical fiber 31 to sense the temperature of the cable core 201, combined with the built-in temperature measuring system 1 to measure the temperature inside the cable connector cavity 101, the temperature of each part of the cable connector 100 can be better measured to obtain a more accurate measurement temperature and reduce errors.

[0064] The temperature-sensitive optical fiber system 3 is used to obtain the optical fiber Raman scattering spectrum. It is based on the Raman scattering effect. The laser pulse interacts with the optical fiber molecules and scatters. Raman scattering is due to the thermal vibration of the optical fiber molecules. It will produce a light with a longer wavelength than the light source and a light with a shorter wavelength than the light source. Then, the distributed measurement of the temperature field along the optical fiber can be realized, and the accurate temperature value of all points along the optical fiber can be obtained. For example, the temperature-sensitive optical fiber system 3 uses a laser pulse with a delay of 10ns, which can realize the temperature measurement of the optical fiber space with a maximum of 30km and a resolution of 1m, which is equivalent to 30,000 measurement points. Based on the above principles, the temperature-sensitive optical fiber temperature measurement technology monitors the temperature of the cable 200 in real time and can effectively monitor the temperature of the cable 200.

[0065] Reference Figure 1 and Figure 5 As shown, in some embodiments, the monitoring device also includes a cable partial discharge monitoring system 4, and the cable partial discharge monitoring system 4 includes a capacitive partial discharge sensor 41 and an inductive partial discharge sensor 42. There is at least one capacitive partial discharge sensor 41, which is arranged in the cable connector 100 and placed on the cable 200, and the capacitive partial discharge sensor 41 is used to collect the discharge signal of the cable 200. There is at least one inductive partial discharge sensor 42, which is arranged in the inner cavity 101 of the cable connector, and the inductive partial discharge sensor 42 is used to collect the discharge signal of the cable 200. The monitoring device is used to monitor the partial discharge situation inside the cable connector 100, and the capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 are arranged at the same time to detect low-frequency and high-frequency partial discharge pulse signals at the same time. The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 provided in this embodiment both adopt the principle of Rogowski coils to sense partial discharge signals in the 1M~100MHz frequency band in real time. During the on-site production of the cable connector 100 , the process of placing the capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 is simple. The original construction personnel only need to perform the construction according to the construction process after simple training, without adding additional connector installation work.

[0066] The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 are preferably installed at the cable connection position, and both are installed at the same local position. The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 are staggered with the first temperature sensor 111 and the second temperature sensor 121.

[0067] At least one capacitive partial discharge sensor 41 and at least one inductive partial discharge sensor 42 are respectively provided for each cable 200. The capacitive partial discharge sensor 41 is a ring-shaped structure, which is sleeved on the outside of the cable 200. The inductive partial discharge sensor 42 is provided on the fixed airbag 21. After the fixed airbag 21 is inflated, the inductive partial discharge sensor 42 is fixed on the side wall of the cable connector inner cavity 101, and the fixed airbag 21 plays a shock-absorbing role in the installation of the inductive partial discharge sensor 42.

[0068] The monitoring device also includes a partial discharge relay module 43, a partial discharge monitoring host 44 and a partial discharge power supply, and the partial discharge relay module 43, the partial discharge monitoring host 44 and the partial discharge power supply are all arranged on the outside of the cable joint 100. The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 are electrically connected to the partial discharge relay module 43 respectively, the partial discharge relay module 43 is electrically connected to the partial discharge monitoring host 44, the partial discharge power supply provides power for the partial discharge monitoring host 44, the partial discharge monitoring host 44 communicates with the remote monitoring platform 6, and the temperature detected by the capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 is provided to the remote monitoring platform 6 in real time through the partial discharge monitoring host 44, thereby realizing real-time monitoring of partial discharge at the cable joint 100. The monitoring device can use the power supply 16 of the built-in temperature measurement system 1, save the number of parts and components, and simplify the structure. The partial discharge relay module 43 and the partial discharge monitoring host 44 are prior art.

[0069] In some embodiments, the monitoring device also includes a sodar identification system 5, which is disposed on the cable connector 100 and is used to collect and analyze surface noise. The sodar identification system 5 can communicate with the remote monitoring platform 6, and transmit the signals of the collected and analyzed surface noise to the remote monitoring platform 6. Specifically, the sodar identification system 5 uses acoustic array acquisition and voiceprint analysis processing to capture the acoustic signals of mechanical operations, such as impact hammers, excavators, and cutting machines, in a complex noise environment, and determine the type and location of the operation. If relevant signals are detected, illegal excavation of urban underground passages is effectively warned. The specific structure of the sodar identification system 5 is a prior art and will not be described in detail here.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. A monitoring device for monitoring a cable connection state, wherein a cable connector (100) is used to connect two cables (200), the cable connector (100) has a cable connector inner cavity (101), and a connecting tube (102) for connecting two cable cores (201) is arranged in the cable connector inner cavity (101), characterized in that: The monitoring device comprises a built-in temperature measurement system (1), and the built-in temperature measurement system (1) comprises: A first temperature measuring module (11) is arranged in the inner cavity (101) of the cable connector, the first temperature measuring module (11) comprising at least one first temperature measuring sensor (111), and the first temperature measuring sensor (111) is arranged outside the connecting tube (102); A second temperature measurement module (12) is arranged in the inner cavity (101) of the cable connector, wherein the second temperature measurement module (12) comprises at least one second temperature measurement sensor (121); The temperature measurement drive module (13) comprises a mounting ring (131), the mounting ring (131) being rotatably connected to the cavity wall of the cable connector inner cavity (101), the second temperature measurement sensor (121) being arranged on the mounting ring (131), and the mounting ring (131) being connected to a temperature measurement drive component (132) for driving the mounting ring (131) to rotate.

2. The monitoring device for monitoring the cable connection status according to claim 1, characterized in that: The temperature measurement drive assembly (132) comprises a bevel gear ring (1321), a bevel gear (1322) and an adjusting rod (1323); the bevel gear ring (1321) is arranged on the mounting ring (131); the bevel gear (1322) is meshingly connected with the bevel gear ring (1321); one end of the adjusting rod (1323) is fixedly connected to the bevel gear (1322); and the other end of the adjusting rod (1323) is used for being rotated by force.

3. The monitoring device for monitoring the cable connection status according to claim 2, characterized in that: The outer wall of the cable connector (100) is recessed with a recessed groove, the other end of the adjustment rod (1323) penetrates the cavity wall of the cable connector inner cavity (101) and is provided with a force-applying portion (1324), the force-applying portion (1324) is placed in the recessed groove, the side wall of the force-applying portion (1324) is sleeved with a sealing member, the sealing member is pressed against the inner wall of the recessed groove, and the adjustment rod (1323) is threadedly connected to the cavity wall of the cable connector inner cavity (101).

4. The monitoring device for monitoring the cable connection status according to claim 1, characterized in that: The monitoring device further comprises a fixing system (2), the fixing system (2) comprising a fixing airbag (21) and an airbag control module (22), the fixing airbag (21) being arranged in the inner cavity (101) of the cable connector and being sleeved on the outer sides of the connecting tube (102) and the two cable cores (201), the airbag control module (22) being arranged on the outer side of the cable connector (100), the airbag control module (22) being connected to the fixing airbag (21), the airbag control module (22) being configured to inflate or deflate the fixing airbag (21), the inflated fixing airbag (21) being used to fix the first temperature sensor (111) on the outer side of the connecting tube (102), and to fix the second temperature sensor (121) on the cavity wall of the inner cavity (101) of the cable connector.

5. The monitoring device for monitoring the cable connection status according to claim 4, characterized in that: The airbag control module (22) comprises: An air storage box (221) is arranged outside the cable connector (100); A partition plate (222) is slidably disposed in the gas storage box (221), and the partition plate (222) divides the gas storage box (221) into a first cavity and a second cavity; A connecting pipe (223) connecting the first cavity and the fixed airbag (21); A driving member (224) is arranged outside the air storage box (221), one end of the driving member (224) passes through the air storage box (221) and is placed in the second cavity, and the driving member (224) is connected to the partition plate (222), and the driving member (224) is used to drive the partition plate (222) to slide.

6. The monitoring device for monitoring the cable connection status according to claim 5, characterized in that: The connecting pipe (223) is spirally wound around the outside of the cable connector (100), and a heating element is provided in the first cavity.

7. The monitoring device for monitoring the cable connection status according to any one of claims 1 to 6, characterized in that: The monitoring device further comprises a temperature sensing optical fiber system (3), wherein the temperature sensing optical fiber system (3) comprises: A temperature measuring optical fiber (31) is arranged in the cable (200) and is in contact with the cable core (201); A wavelength division multiplexer (32), connected to the temperature measuring optical fiber (31), and used for collecting backscattered signals of the temperature measuring optical fiber (31); A laser (33), connected to the wavelength division multiplexer (32), and used to provide a pulse signal for the wavelength division multiplexer (32); A signal detector (34), connected to the wavelength division multiplexer (32), and used for receiving a signal from the wavelength division multiplexer (32) or sending a signal to the wavelength division multiplexer (32); A control module (35) is connected to the signal detector (34) and is used to collect and analyze the signal of the signal detector (34).

8. The monitoring device for monitoring the cable connection status according to any one of claims 4 to 6, characterized in that: The monitoring device further comprises a cable partial discharge monitoring system (4), wherein the cable partial discharge monitoring system (4) comprises: A capacitive partial discharge sensor (41), provided with at least one capacitive partial discharge sensor (41), arranged in the inner cavity (101) of the cable connector and placed on the cable (200), the capacitive partial discharge sensor (41) being used to collect a discharge signal of the cable (200); At least one inductive partial discharge sensor (42) is provided and is arranged in the inner cavity (101) of the cable connector. The inductive partial discharge sensor (42) is used to collect a discharge signal of the cable (200).

9. The monitoring device for monitoring the cable connection status according to claim 8, characterized in that: The inductive partial discharge sensor (42) is arranged on the fixed airbag (21).

10. The monitoring device for monitoring the cable connection status according to any one of claims 1 to 6, characterized in that: The monitoring device further comprises a sodar identification system (5), wherein the sodar identification system (5) is arranged on the cable connector (100), and the sodar identification system (5) is used to collect and analyze noise on the ground surface.

Images