A monitoring device for monitoring the state of a cable connection

Abstract

The application belongs to the technical field of cable fault monitoring, and specifically discloses a monitoring device for monitoring the connection state of a cable. The first temperature measuring sensor of the monitoring device is arranged on the outer side of the connecting pipe, and is used for acquiring the temperature at the local position of the cable. The second temperature measuring sensor is used for acquiring the temperature in the inner cavity of the cable joint. The temperature at the two cable connection positions is detected in all directions to obtain a more accurate measured temperature at the cable connection joint, thereby reducing the temperature measurement error and improving the accuracy of the cable connection joint state monitoring. In addition, the temperature measuring driving assembly drives the mounting ring to rotate relative to the cavity wall of the inner cavity of the cable joint, thereby adjusting the position of the second temperature measuring sensor to change the temperature detection position of the second temperature measuring sensor. The monitoring device is suitable for different application scenarios, improves the flexibility of use, reduces the temperature measurement error, and improves the accuracy of the cable connection joint state monitoring.

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 placed on the original management model.

[0003] According to incomplete statistics, approximately 70% of cable failures are caused by connector failures. These factors include quality issues with the connector accessories themselves, installation defects, and environmental factors (such as water and dust). During high-load operation in extreme weather conditions such as extreme cold and heat, localized heating accelerates thermal aging of accessories, leading to insulation degradation and, under certain conditions, breakdown failures. Therefore, real-time online monitoring of cable connectors is essential to achieve the overall goals of safe, reliable, and quantitative management of power grids.

[0004] Existing temperature monitoring systems for cable joints typically consist of an internal temperature measurement module, an external temperature measurement relay, a non-closed mutual inductance power supply, and a cable status monitoring box. The internal temperature measurement module collects temperature data while receiving power and wirelessly transmits this data to the external temperature measurement relay, enabling real-time measurement of the conductor temperature of the cable joint. However, existing temperature measurement modules can only measure the temperature of a single point on the cable joint, making the measurement difficult to universally measure and representing the condition of the entire cable 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 a cable joint is used to connect two cables, the cable joint having a cable joint inner cavity, wherein a connecting tube for connecting two cable cores is provided in the cable joint inner cavity, the monitoring device including a built-in temperature measurement system, the built-in temperature measurement system comprising:

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

[0009] A second temperature measurement module is provided 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 driving module comprises a mounting ring, the mounting ring is rotationally connected with the cavity wall of the cable joint inner cavity, the second temperature measurement sensor is arranged on the mounting ring, and the mounting ring is connected with a temperature measurement driving assembly for driving the mounting ring to rotate.

[0011] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection state, the temperature measurement driving assembly comprises 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 meshingly connected with the bevel gear ring, one end of the adjusting rod is fixedly connected with the bevel gear, and the other end of the adjusting rod is used for being rotationally driven.

[0012] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection state, the outer side wall of the cable joint is recessed with a recess, the other end of the adjusting rod penetrates the cavity wall of the cable joint inner cavity and is provided with a force applying part, the force applying part is arranged in the recess, the side wall of the force applying part is sleeved with a sealing element, the sealing element is pressed against the inner side wall of the recess, and the adjusting rod is screwed with the cavity wall of the cable joint inner cavity.

[0013] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection state, the monitoring device further comprises a fixing system, the fixing system comprises a fixing air bag and an air bag control module, the fixing air bag is arranged in the cable joint inner cavity and sleeved with the outer sides of the connecting pipe and the two cable cores, the air bag control module is arranged outside the cable joint, the air bag control module is connected with the fixing air bag, the air bag control module is configured to inflate or deflate the fixing air bag, the inflated fixing air bag is used for fixing the first temperature measurement sensor outside the connecting pipe and fixing the second temperature measurement sensor on the cavity wall of the cable joint inner cavity.

[0014] As an optional technical solution of the above-mentioned monitoring device for monitoring the cable connection state, the air bag control module comprises:

[0015] A gas storage box is arranged outside the cable joint;

[0016] A partition plate is slidingly arranged in the gas storage box, and the partition plate divides the gas storage box into a first cavity and a second cavity;

[0017] A communication pipe connects the first cavity and the fixing air bag;

[0018] A driving member is arranged outside the gas storage box, one end of the driving member penetrates the gas storage box and is arranged in the second cavity, the driving member is connected with the partition plate, and the driving member is used for driving the partition plate to slide.

[0019] As an optional technical scheme of the monitoring device for monitoring the cable connection state, the communication pipe is spirally wound outside the cable joint, and the first cavity is provided with a heating element.

[0020] As an optional technical scheme of the monitoring device for monitoring the cable connection state, the monitoring device further comprises a temperature sensing optical fiber system, which comprises:

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

[0022] A wavelength division multiplexer is connected with the temperature sensing optical fiber and used for collecting backscattering signals of the temperature sensing optical fiber;

[0023] A laser is connected with the wavelength division multiplexer and used for providing pulse signals for the wavelength division multiplexer;

[0024] A signal detector is connected with the wavelength division multiplexer and used for receiving signals of the wavelength division multiplexer or sending signals to the wavelength division multiplexer;

[0025] A control module is connected with the signal detector and used for collecting and analyzing signals of the signal detector.

[0026] As an optional technical scheme of the monitoring device for monitoring the cable connection state, the monitoring device further comprises a cable partial discharge monitoring system, which comprises:

[0027] At least one capacitive partial discharge sensor is arranged in the inner cavity of the cable joint and on the cable, and the capacitive partial discharge sensor is used for collecting discharge signals of the cable;

[0028] At least one inductive partial discharge sensor is arranged in the inner cavity of the cable joint, and the inductive partial discharge sensor is used for collecting discharge signals of the cable.

[0029] As an optional technical scheme of the monitoring device for monitoring the cable connection state, the inductive partial discharge sensor is arranged on the fixed air bag.

[0030] As an optional technical scheme of the monitoring device for monitoring the cable connection state, the monitoring device further comprises an acoustic radar identification system, which is arranged on the cable joint and used for collecting and analyzing noises of the ground.

[0031] The present application has the following beneficial effects:

[0032] The application provides a monitoring device for monitoring cable connection state, a first temperature measuring sensor is arranged outside a connecting pipe, the first temperature measuring sensor is used for acquiring temperature at a local position of a cable, and a second temperature measuring sensor is used for acquiring temperature in a cavity of a cable joint, so that all-around detection of temperature at two cable connection positions is realized, more accurate measured temperature at the cable connection joint is acquired, temperature measurement error is reduced, and the accuracy of cable connection joint state monitoring is improved; in addition, a temperature measuring driving assembly drives a mounting ring to rotate relative to a cavity wall of the cable joint cavity, and then the position of the second temperature measuring sensor is adjusted, so that the position of the second temperature measuring sensor for detecting temperature is changed, the monitoring device is suitable for different application scenarios, the flexibility of the monitoring device is improved, the temperature measurement error is reduced, and the accuracy of cable connection joint state monitoring is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of the monitoring device for monitoring cable connection state provided by the embodiment of the application;

[0034] Figure 2 is a structural schematic diagram of the built-in temperature measuring system provided by the embodiment of the application;

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

[0036] Figure 4 is a structural schematic diagram of the temperature sensing optical fiber system provided by the embodiment of the application;

[0037] Figure 5 is a structural block diagram of the monitoring device for monitoring cable connection state provided by the embodiment of the application.

[0038] In the drawings:

[0039] 100, cable joint; 101, cable joint cavity; 102, connecting pipe; 103, pressure equalizing sleeve; 200, cable; 201, cable core;

[0040] 1, built-in temperature measuring system; 2, fixing system; 3, temperature sensing optical fiber system; 4, cable partial discharge monitoring system; 5, acoustic radar identification system; 6, remote monitoring platform;

[0041] 11, first temperature measuring module; 111, first temperature measuring sensor; 12, second temperature measuring module; 121, second temperature measuring sensor; 13, temperature measuring driving module; 131, mounting ring; 132, temperature measuring driving assembly; 1321, bevel gear ring; 1322, bevel gear; 1323, adjusting rod; 1324, force applying part; 14, temperature measuring relay module; 15, temperature measuring monitoring host; 16, power supply;

[0042] 21, fixing air bag; 22, air bag control module; 221, gas storage box; 222, partition plate; 223, communication 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 application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for explaining the application, but not limiting the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the convenience of description, but not all the structures.

[0046] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0049] As Figure 1As shown, the connection of the two cables 200 adopts a cable joint 100, the cable joint 100 has a cable joint inner cavity 101, a connecting pipe 102 connecting the two cable cores 201 is arranged in the cable joint inner cavity 101, and an equalizing sleeve 103 is arranged outside the connecting pipe 102 to seal the connection gap between the connecting pipe 102 and the insulating sheath of the cable core 201.

[0050] As shown in Figure 1 and Figure 2 The embodiment provides a monitoring device for monitoring the connection state of the cable, which is used for monitoring whether there is a fault defect in the connection of the two cables 200. The monitoring device comprises an internal temperature measurement system 1, which comprises a first temperature measurement module 11, a second temperature measurement module 12 and a temperature measurement driving module 13. The first temperature measurement module 11 is arranged in the cable joint inner cavity 101, and the first temperature measurement module 11 comprises 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 cable joint inner cavity 101, and the second temperature measurement module 12 comprises at least one second temperature measurement sensor 121. The temperature measurement driving module 13 comprises a mounting ring 131, the mounting ring 131 is rotationally connected with the cavity wall of the cable joint inner cavity 101, the second temperature measurement sensor 121 is arranged on the mounting ring 131, and the mounting ring 131 is connected with a temperature measurement driving assembly 132 for driving the mounting ring 131 to rotate.

[0051] The first temperature measurement sensor 111 is arranged outside the connecting pipe 102, and the first temperature measurement sensor 111 is used for acquiring the temperature at the local position of the cable. The second temperature measurement sensor 121 is used for acquiring the temperature in the cable joint inner cavity 101, which realizes omnidirectional detection of the temperature at the connection of the two cables 200, so as to obtain a more accurate measurement temperature at the cable connection joint, reduces the error of temperature measurement, and further improves the accuracy of the state monitoring of the cable connection joint. In addition, the temperature measurement driving assembly 132 drives the mounting ring 131 to rotate relative to the cavity wall of the cable joint inner cavity 101, and then adjusts the position of the second temperature measurement sensor 121, so as to change the position of the second temperature measurement sensor 121 for detecting 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 the state monitoring of the cable connection joint.

[0052] In order to improve the accuracy of temperature detection in the cable joint 100, the first temperature measurement module 11 comprises at least two first temperature measurement sensors 111, and at least one first temperature measurement sensor 111 is arranged outside each cable core 201. Preferably, the first temperature measurement sensor 111 is arranged outside the connecting pipe 102 and is sleeved outside the cable core 201.

[0053] The at least two second temperature measuring sensors 121 are arranged on the mounting ring 131 in a circumferential direction to improve the accuracy of temperature detection in the cable joint 100.

[0054] Optionally, the temperature measuring driving 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. Specifically, the bevel gear ring 1321 can be an integral structure with the mounting ring 131, i.e. the bevel gear ring 1321 is formed by machining bevel gears along the circumferential direction of the mounting ring 131, or the bevel gear ring 1321 is a split structure with the mounting ring 131, i.e. the bevel gear ring 1321 is a ring with bevel gears, and the bevel gear ring 1321 is connected with the mounting ring 131 by bolts or welding, which is not limited here. The bevel gear 1322 is connected with the bevel gear ring 1321 in meshing, one end of the adjusting rod 1323 is fixedly connected with the bevel gear 1322, and the other end of the adjusting rod 1323 is used to be rotated by force. Rotating the adjusting rod 1323 can drive the bevel gear 1322 to rotate around its axis, and the rotation of the bevel gear 1322 drives the bevel gear ring 1321 to rotate, and further drives the mounting ring 131 to rotate, thereby adjusting the position of the second temperature measuring sensor 121. The temperature measuring driving module 13 has a simple structure and can be installed in the structure of the cable joint inner cavity 101.

[0055] Further optionally, the other end of the adjusting rod 1323 penetrates the cavity wall of the cable joint inner cavity 101 and is arranged outside the cable joint 100, and the adjusting rod 1323 is screwed with the cavity wall of the cable joint inner cavity 101. Rotating the other end of the adjusting rod 1323, the adjusting rod 1323 rotates relative to the cable joint 100, and further drives the bevel gear 1322 to rotate around its axis. The outer wall of the cable joint 100 is recessed with a recess, the other end of the adjusting rod 1323 is provided with a force applying part 1324, the force applying part 1324 is arranged in the recess, the side wall of the force applying part 1324 is sleeved with a sealing element, and the sealing element abuts against the inner side wall of the recess. The force applying part 1324 is used to connect a component for applying external force to rotate the adjusting rod 1323, and the force applying part 1324 is arranged in the recess, which does not affect the burying of the cable 200. The sealing element ensures the sealing of the cable joint 100, and external impurities cannot enter the cable joint 100 through the gap between the adjusting rod 1323 and the side wall of the cable joint 100.

[0056] The end face of the force applying part 1324 is recessed 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 wrench used by a person, which is not 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 respectively electrically connected to the temperature measurement relay module 14, and 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 temperatures detected by the first temperature measurement sensor 111 and the second temperature measurement sensor 121 are 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 connector 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, which includes a fixing airbag 21 and an airbag control module 22. The fixing airbag 21 is disposed in the cable connector cavity 101 and is sleeved on the outside of the connecting tube 102 and the two cable cores 201. The airbag control module 22 is disposed on the outside of the cable connector 100 and 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 the second temperature sensor 121 on the wall of the cable connector cavity 101. When the fixing airbag 21 is deflated, a gap exists between the fixing airbag 21 and the inner wall of the cable connector cavity 101, allowing the second temperature measurement module 12 to be placed in the cable connector cavity 101. When the fixing airbag 21 is inflated, it abuts against the inner wall of the cable connector cavity 101, securing the second temperature sensor 121. This allows the second temperature sensor 121 to abut against the cavity wall of the cable connector cavity 101. Furthermore, the fixing airbag 21 acts as a shock absorber for various components, making the cable connector 100 more stable and less susceptible to external environmental influences.

[0060] Optionally, the airbag control module 22 includes an air box 221, a partition plate 222, a connecting pipe 223, and a driving member 224. The air box 221 is arranged on the outside of the cable connector 100, and the partition plate 222 is slidably arranged in the air box 221. The partition plate 222 divides the air box 221 into 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 on the outside of the air box 221. One end of the driving member 224 passes through the air box 221 and is placed in the second cavity. The driving member 224 is connected to the partition plate 222 and is used to drive the partition plate 222 to slide. The size of the first cavity and the second cavity is changed by the movement of 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] Connecting tube 223 is spirally wound around the outside of cable connector 100. This spirally wound connecting tube 223 increases its contact area with the air or soil, improving cooling efficiency. A heating element is located within the first cavity to heat the air within. The heating element and connecting tube 223 work together to regulate the temperature within cable connector 100, bringing it closer to the desired operating temperature.

[0062] like Figure 4 and Figure 5 As shown, in some embodiments, the monitoring device further includes a temperature-sensing fiber optic system 3, which includes a temperature-sensing fiber optic system 31, a wavelength division multiplexer 32, a laser 33, a signal detector 34, and a control module 35. The temperature-sensing fiber optic system 31 is disposed within the cable 200 and contacts the cable core 201. The wavelength division multiplexer 32 is connected to the temperature-sensing fiber optic system 31 and is configured to collect backscattered signals from the temperature-sensing fiber optic system 31. The laser 33 is connected to the wavelength division multiplexer 32 and is configured to provide a pulse signal to the wavelength division multiplexer 32. The signal detector 34 is connected to the wavelength division multiplexer 32 and is configured to receive signals from or send signals to the wavelength division multiplexer 32. The control module 35 is connected to the signal detector 34 and is configured to collect and analyze signals from the signal detector 34. The control module 35 is in communication with the remote monitoring platform 6 and transmits the analyzed signals from the signal detector 34 to the remote monitoring platform 6, thereby enabling real-time temperature monitoring at the cable connector 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 to the wavelength division multiplexer 32. Furthermore, the control module 35 is electrically connected to a drive circuit, which is electrically connected to the laser 33. The control module 35 drives the laser 33 through the drive circuit to provide a pulse signal to 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, can better measure the temperature of various parts of the cable connector 100 to obtain more accurate measurement temperature and reduce errors.

[0064] Temperature-sensing fiber optic system 3 is used to obtain the fiber Raman scattering spectrum. It relies on the Raman scattering effect, where laser pulses interact with fiber molecules, causing scattering. Raman scattering is due to the thermal vibrations of fiber molecules, which produces a light with a longer wavelength than the light source and a light with a shorter wavelength than the light source. This allows for distributed measurement of the temperature field along the fiber, resulting in accurate temperature values ​​at all points along the fiber. For example, using a laser pulse with a 10ns delay, temperature-sensing fiber optic system 3 can measure the temperature of a fiber space up to 30km with a resolution of 1m, equivalent to 30,000 measurement points. Based on the above principles, temperature-sensing fiber optic temperature measurement technology monitors the temperature of cable 200 in real time, effectively monitoring the temperature of 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, which includes a capacitive partial discharge sensor 41 and an inductive partial discharge sensor 42. At least one capacitive partial discharge sensor 41 is provided, disposed within the cable connector 100 and placed on the cable 200. The capacitive partial discharge sensor 41 is used to collect discharge signals from the cable 200. At least one inductive partial discharge sensor 42 is provided, disposed within the cable connector cavity 101, and is used to collect discharge signals from the cable 200. The monitoring device is used to monitor partial discharge conditions within the cable connector 100. The simultaneous provision of the capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 can simultaneously detect low-frequency and high-frequency partial discharge pulse signals. The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 provided in this embodiment both utilize the principle of Rogowski coils to sense partial discharge signals in the 1 MHz to 100 MHz 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. Original construction personnel only need to undergo simple training and follow the construction process to perform the construction 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 location, and are both installed at the same local location. 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] Each cable 200 corresponds to at least one capacitive partial discharge sensor 41 and at least one inductive partial discharge sensor 42. The capacitive partial discharge sensor 41 is in a ring structure, which is sleeved outside the cable 200. The inductive partial discharge sensor 42 is arranged on the fixed air bag 21, and after the fixed air bag 21 is inflated, the inductive partial discharge sensor 42 is fixed on the side wall of the cable joint inner cavity 101, and the fixed air bag 21 plays a damping role in the installation of the inductive partial discharge sensor 42.

[0068] The monitoring device further comprises a partial discharge relay module 43, a partial discharge monitoring host 44 and a partial discharge power supply, which are all arranged outside the cable joint 100. The capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 are electrically connected with the partial discharge relay module 43, the partial discharge relay module 43 is electrically connected with the partial discharge monitoring host 44, the partial discharge power supply provides power supply for the partial discharge monitoring host 44, and the partial discharge monitoring host 44 communicates with the remote monitoring platform 6, so as to provide the temperature detected by the capacitive partial discharge sensor 41 and the inductive partial discharge sensor 42 to the remote monitoring platform 6 in real time through the partial discharge monitoring host 44, thereby realizing real-time monitoring of the 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 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 further comprises an acoustic radar identification system 5 arranged on the cable joint 100, which is used to collect and analyze the noise of the ground. The acoustic radar identification system 5 can communicate with the remote monitoring platform 6 and transmit the collected and analyzed signal of the ground noise to the remote monitoring platform 6. Specifically, the acoustic radar identification system 5 adopts acoustic array collection and acoustic print analysis processing, captures the acoustic signals of mechanical operations such as impact hammers, excavators and cutting machines in a complex noise environment, and judges the operation type and position. If the relevant signal is detected, the illegal excavation of the urban underground passage can be effectively warned. The specific structure of the acoustic radar identification system 5 is prior art, which will not be specifically introduced here.

[0070] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A monitoring device for monitoring the state of a cable connection, a cable joint (100) being provided for connecting two cables (200), the cable joint (100) having a cable joint inner chamber (101), a connecting tube (102) being provided in the cable joint inner chamber (101) for connecting two cable cores (201), characterized in that The monitoring device comprises a built-in temperature measurement system (1), which comprises: a first temperature measurement module (11) arranged in the cable joint inner cavity (101), the first temperature measurement module (11) comprising at least one first temperature sensor (111), the first temperature sensor (111) being arranged outside the connecting pipe (102); a second temperature measurement module (12) arranged in the cable joint inner cavity (101), the second temperature measurement module (12) comprising at least one second temperature sensor (121); a temperature measurement driving module (13) comprising a mounting ring (131), the mounting ring (131) being rotatably connected with the cavity wall of the cable joint inner cavity (101), the second temperature sensor (121) being arranged on the mounting ring (131), and the mounting ring (131) being connected with a temperature measurement driving assembly (132) for driving the rotation of the mounting ring (131); The monitoring device further comprises a fixing system (2), the fixing system (2) comprising a fixing air bag (21) and an air bag control module (22), the fixing air bag (21) being arranged in the cable joint inner cavity (101) and sleeved outside the connecting pipe (102) and the two cable cores (201), the air bag control module (22) being arranged outside the cable joint (100), the air bag control module (22) being connected with the fixing air bag (21), and the air bag control module (22) being configured to inflate or deflate the fixing air bag (21), the inflated fixing air bag (21) being used for fixing the first temperature sensor (111) outside the connecting pipe (102) and fixing the second temperature sensor (121) on the cavity wall of the cable joint inner cavity (101); The air bag control module (22) comprises: a gas storage box (221) arranged outside the cable joint (100); a partition plate (222) slidably arranged in the gas storage box (221), the partition plate (222) dividing the gas storage box (221) into a first cavity and a second cavity; a communication pipe (223) connecting the first cavity and the fixing air bag (21); a driving member (224) arranged outside the gas storage box (221), one end of the driving member (224) penetrating the gas storage box (221) and being arranged in the second cavity, and the driving member (224) being connected with the partition plate (222), the driving member (224) being used for driving the partition plate (222) to slide.

2. The monitoring device for monitoring a state of a cable connection according to claim 1, characterized by, The temperature measurement driving assembly (132) comprises a bevel gear ring (1321), a bevel gear (1322) and an adjusting rod (1323), the bevel gear ring (1321) being arranged on the mounting ring (131), the bevel gear (1322) being meshingly connected with the bevel gear ring (1321), one end of the adjusting rod (1323) being fixedly connected with the bevel gear (1322), and the other end of the adjusting rod (1323) being used for being rotatably driven.

3. The monitoring device for monitoring a state of a cable connection according to claim 2, characterized by, The outer side wall of the cable joint (100) is concave with a recess, the other end of the adjusting rod (1323) penetrates the cavity wall of the cable joint inner cavity (101) and is provided with a force applying part (1324), the force applying part (1324) is arranged in the recess, the side wall of the force applying part (1324) is sleeved with a sealing element, the sealing element is pressed against the inner side wall of the recess, and the adjusting rod (1323) is screwed with the cavity wall of the cable joint inner cavity (101).

4. The monitoring device for monitoring a cable connection state according to claim 1, characterized by, The communication pipe (223) is spirally wound outside the cable joint (100), and the first cavity is provided with a heating element.

5. The monitoring device for monitoring a status of a cable connection according to any one of claims 1 to 4, characterized in that, The monitoring device further comprises a temperature sensing optical fiber system (3), which comprises: a temperature sensing optical fiber (31) arranged in the cable (200) and in contact with the cable core (201); a wavelength division multiplexer (32) connected with the temperature sensing optical fiber (31) and used for collecting backscattering signals of the temperature sensing optical fiber (31); a laser (33) connected with the wavelength division multiplexer (32) and used for providing pulse signals for the wavelength division multiplexer (32); a signal detector (34) connected with the wavelength division multiplexer (32) and used for receiving signals of the wavelength division multiplexer (32) or sending signals to the wavelength division multiplexer (32); a control module (35) connected with the signal detector (34) and used for collecting and analyzing signals of the signal detector (34).

6. The monitoring device for monitoring a state of a cable connection according to claim 4, characterized by, The monitoring device further comprises a cable partial discharge monitoring system (4), which comprises: at least one capacitive partial discharge sensor (41) arranged in the cable joint inner cavity (101) and on the cable (200), the capacitive partial discharge sensor (41) being used for collecting discharge signals of the cable (200); at least one inductive partial discharge sensor (42) arranged in the cable joint inner cavity (101), the inductive partial discharge sensor (42) being used for collecting discharge signals of the cable (200).

7. The monitoring device for monitoring a status of a cable connection according to claim 6, characterized in that, The inductive partial discharge sensor (42) is arranged on the fixed air bag (21).

8. The monitoring device for monitoring a status of a cable connection according to any one of claims 1 to 4, characterized in that, The monitoring device further comprises an acoustic radar identification system (5) arranged on the cable joint (100), the acoustic radar identification system (5) being used for collecting and analyzing noises of the ground.

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