Cable joint monitoring device and system

Abstract

The invention provides a cable joint monitoring device, which comprises an explosion-proof box, a monitoring mechanism, a fire extinguishing mechanism and a power supply module, and is characterized in that the monitoring mechanism and the fire extinguishing mechanism are in communication connection to jointly realize real-time monitoring of a cable joint and a cable well environment, and when an abnormity is detected, an alarm is triggered and the fire extinguishing mechanism is started. The invention also provides a cable joint monitoring system. The cable joint monitoring system comprises a cloud server, a visual platform and the cable joint monitoring device. According to the cable joint monitoring device and system, all-directional and multi-dimensional data monitoring can be provided, so that operation and maintenance personnel can comprehensively and accurately know the real-time states of the cable joint and the environment where the cable joint is located.

Description

Technical Field

[0001] This application relates to the technical field of cable protection, and specifically, to a cable joint monitoring device and system. Background Art

[0002] In recent years, with the accelerating urbanization process, high-voltage power cables have gradually become the core carriers of urban power transmission and distribution networks due to their significant advantages of spatial intensification, urban landscape coordination, and power supply reliability. However, engineering practices have shown that power cables are prone to abnormal temperature rise under the combined action of multiple factors during long-term service, and the thermal effect problem at the cable joint part is particularly prominent. This problem is mainly attributed to factors such as crimping process defects and joint water seepage. Excessive temperature rise will have an adverse impact on the insulating material of the power cable, accelerate the insulation aging process, and thus reduce the overall service life of the cable. In extreme cases, it may also trigger fire accidents or cause power outages, resulting in serious consequences. In view of this, the temperature of the cable joint, the ambient temperature in the cable well, as well as smoke, manhole cover and other states have become key indicators for evaluating the cable ampacity, and it is particularly important to monitor them in real time and effectively. Summary of the Invention

[0003] The purpose of this application is to provide a cable joint monitoring device and system, which can monitor the temperature of the cable joint and the cable well environment in real time, and greatly improve the safety of power cables.

[0004] According to one aspect of this application, a cable joint monitoring device is provided, which includes:

[0005] An explosion-proof box, which is arranged outside the cable joint to protect the cable joint;

[0006] A monitoring mechanism, including a cable joint fire monitoring mechanism and a cable well monitoring mechanism. Among them, the cable joint fire monitoring mechanism is externally arranged on the explosion-proof box and is used to monitor the smoke, temperature and partial discharge at the cable joint, and the cable well monitoring mechanism is arranged in the cable well where the cable joint is placed and is used to monitor the position and state of the manhole cover, the temperature in the well and the water level in the well;

[0007] A fire extinguishing mechanism, which is used to extinguish the fire when a fire is detected; and

[0008] A power supply module, which is electrically connected to the monitoring mechanism and the fire extinguishing mechanism and is used to provide power for the monitoring mechanism and the fire extinguishing mechanism;

[0009] The cable joint fire monitoring mechanism, the cable well monitoring mechanism and the fire extinguishing mechanism are communicatively connected to jointly realize the real-time monitoring of the cable joint and the cable well environment, and trigger an alarm and start the fire extinguishing mechanism when an abnormality is detected.

[0010] Preferably, the cable joint fire monitoring mechanism includes:

[0011] A smoke sensor for monitoring the smoke inside the cable joint;

[0012] A temperature sensor for monitoring the temperature of the battery cells inside the cable joint and the internal environment of the cable joint; and

[0013] A current sensor for partial discharge monitoring;

[0014] The smoke sensor, temperature sensor and current sensor are electrically connected, and send corresponding alarm prompts when the cable temperature exceeds the set threshold or smoke is generated.

[0015] Preferably, the cable shaft monitoring mechanism includes a manhole cover monitoring unit, an in-well temperature monitoring unit and an underground water level monitoring unit. Among them,

[0016] The manhole cover monitoring unit is arranged at the manhole cover and is used to monitor the position and state of the manhole cover. When the manhole cover tilts or moves, the manhole cover monitoring unit monitors in real time and sends corresponding alarm status prompts;

[0017] The in-well temperature monitoring unit is arranged on the well wall and is used to monitor the underground temperature in real time. When the underground temperature exceeds the set threshold, it sends a corresponding alarm prompt; and

[0018] The underground water level monitoring unit is arranged on the well wall and is used to monitor the underground water level height in real time. When the underground water level rises beyond the set threshold, it sends a corresponding alarm prompt.

[0019] Preferably, the monitoring module further includes a microprocessor and an NB-IoT communication module for realizing real-time and multi-channel acquisition and transmission of data.

[0020] Preferably, the fire extinguishing mechanism is a perfluoroketone fire extinguishing device, which starts the fire extinguishing operation when receiving the corresponding alarm signal.

[0021] According to another aspect of the present application, a cable joint monitoring system is provided, which includes: a cloud server, a visualization platform and the cable joint monitoring device in the above solution. The cloud server includes a data receiving module, a database and an analysis module that are communicatively connected; the data receiving module is communicatively connected to all the cable joint monitoring devices, and the data receiving module is used for the monitoring data of the cable joints and the cable shafts; the database is used to store and back up the monitoring data; the analysis module is used to generate a monitoring report based on all the monitoring data, and generate an alarm instruction when the monitoring report meets the preset alarm conditions; the visualization platform is communicatively connected to the analysis module, and the visualization platform is used to display the monitoring report and the alarm instruction.

[0022] According to another aspect of the present application, a method for monitoring a cable joint is provided, and the method includes the following steps:

[0023] An explosion-proof box is arranged outside the cable joint;

[0024] A cable joint fire monitoring mechanism is arranged on the explosion-proof box for monitoring smoke, temperature and partial discharge at the cable joint, and when the cable temperature exceeds a set threshold or smoke is generated, corresponding alarm prompts are sent to the cloud server through a built-in microprocessor and communication module;

[0025] A manhole cover monitoring unit is arranged at the manhole cover of the cable shaft for monitoring the position and state of the manhole cover. When the manhole cover tilts or moves, it is monitored in real time through a built-in microprocessor and communication module and corresponding alarm status prompts are sent to the cloud server;

[0026] An in-shaft temperature monitoring unit and an in-shaft water level monitoring unit are arranged in the cable shaft for monitoring the in-shaft temperature and in-shaft water level in real time. When the in-shaft temperature or water level exceeds a set threshold, corresponding alarm prompts are sent to the cloud server through a built-in microprocessor and communication module;

[0027] The cloud server receives, stores and backs up the monitoring data, generates a monitoring report based on the monitoring data, generates an alarm instruction when the monitoring report meets a preset alarm condition, and issues a start command to a fire extinguishing mechanism arranged in the cable shaft when it is determined that a fire occurs. At the same time, a visualization platform displays the monitoring report and the alarm instruction;

[0028] The fire extinguishing mechanism starts fire extinguishing measures according to the received command.

[0029] According to the cable joint monitoring device and system of the present application, it has a powerful data acquisition ability and can simultaneously monitor a variety of key data including the temperature, current and smoke concentration of the cable joint. In addition, the device also incorporates the monitoring of the attitude and position of the manhole cover, as well as the real-time monitoring of the in-shaft environmental temperature and water level. This all-round and multi-dimensional data monitoring enables the operation and maintenance personnel to comprehensively and accurately understand the real-time state of the cable joint and its surrounding environment. Once any abnormality is found, such as a sudden rise in temperature, current overload, excessive smoke concentration or abnormal opening of the manhole cover, the system will immediately issue a warning, providing a valuable time window for taking timely countermeasures.

[0030] In addition, the integrated design of the cable joint fire monitoring mechanism and the explosion-proof box not only simplifies the equipment installation process and reduces the complexity of external pipelines, but more importantly, it enhances the overall protection ability of the equipment. At the same time, the integrated design also makes the signal transmission between the monitoring device and the explosion-proof box more stable and reliable, ensuring the accuracy and real-time nature of the data. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is an installation schematic diagram of a cable joint monitoring device according to an embodiment of the present application.

[0033] Figure 2 It is a schematic diagram of a data acquisition and transmission architecture according to an embodiment of the present application.

[0034] Reference numerals: 1, cable well identification; 2, fire extinguishing mechanism; 3, cable joint fire detection mechanism; 4, explosion-proof box; 5, manhole cover monitoring unit; 6, underground water level monitoring unit. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] According to Figure 1 As shown, the cable joint monitoring device includes an explosion-proof box, a cable joint fire monitoring mechanism, a cable well monitoring mechanism, a fire extinguishing mechanism, and a power supply module. In one embodiment, the explosion-proof box housing can be formed by SMC in one step, with high strength and corrosion resistance. It is arranged outside the cable joint to protect the cable joint. The protection level of the explosion-proof box usually reaches IP65 to ensure the reliability of the device in a harsh environment. In addition, auxiliary materials such as arc extinguishing quartz sand and desiccant can also be installed inside the explosion-proof box to protect the internal cable intermediate joint.

[0037] The fire monitoring mechanism of the cable joint is externally placed on the explosion-proof box to form an integrated structure, and includes a smoke sensor, a temperature sensor, and a current sensor, which are used to monitor the smoke at the cable joint, the temperature and partial discharge of the cable core inside the cable, and the internal environment of the cable joint. The smoke sensor can be, for example, an early air sampling fire detector or an optoelectronic smoke sensor. The early air sampling fire detector uses laser detection technology and can detect extremely tiny smoke particles, and immediately emits a warning signal when the smoke concentration exceeds the set threshold. This detector performs well in the complex environment inside the cable shaft and can issue a warning at the initial stage of a fire. The temperature sensor can be, for example, a thermistor, a thermocouple, a resistance temperature detector (RTD), or an IC temperature sensor, etc. In one embodiment, a high-temperature thermistor is used, in the range of -40 to 200 °C, epoxy resin encapsulated, with a withstand voltage of AC1200V, and an IP65 protection level, and is processed through anti-electromagnetic interference shielding. In this embodiment, the sensors are installed on the surface of the joint, and 3 sensors are installed at intervals of 120° (60°, 90°, 120° thresholds) to monitor the temperature gradient in real time, and are fixed with flexible silica gel to avoid mechanical stress damage to the cable. The partial discharge monitoring uses a high-frequency current sensor (HFCT) to detect discharge signals greater than 10 pC.

[0038] The cable shaft monitoring mechanism includes a manhole cover monitoring unit, an in-well temperature monitoring unit, and an underground water level monitoring unit. In one embodiment, the manhole cover monitoring unit includes a high-performance low-power processor, a highly sensitive three-axis acceleration sensor chip, and a low-power NB-IoT communication module. Through the communication module, data such as the status information of the manhole cover and the battery power information are uploaded to the data management platform of the cloud server to realize the position management and status monitoring of the manhole cover. When the manhole cover tilts or moves, the manhole cover system monitoring center receives the corresponding alarm status prompt in real time (within 10 seconds) and arranges for processing in a timely manner.

[0039] The in-well temperature monitoring unit is set at the well wall and is used to monitor the underground temperature in real time. When the underground temperature is too high or changes sharply, the manhole cover system monitoring center receives the corresponding alarm status prompt in real time (within 10 seconds) and arranges for processing in a timely manner.

[0040] The underground water level monitoring unit is internally provided with a high-performance low-power processor, a water level sensor, and a low-power NB-IoT communication module, and uploads data such as the underground water level height and the battery power information to the data management platform of the cloud server to realize the monitoring of the underground water level status. When the underground water level rises, the manhole cover system monitoring center receives the corresponding alarm status prompt in real time (within 10 seconds) and arranges for processing in a timely manner.

[0041] In one embodiment, the fire extinguishing mechanism is a brand-new fire extinguishing device using a new generation of environmentally friendly perfluoromethylcyclohexanone as the fire extinguishing medium, which can quickly extinguish fires, leaving no residue, no corrosion, safe and environmentally friendly after extinguishing, and is used for extinguishing fires when receiving alarm signals and start commands. In addition, the perfluoromethylcyclohexanone fire extinguishing device can also achieve repeated start-stop and intermittent spraying to ensure effective protection.

[0042] Figure 2 Fig. shows the data acquisition and transmission architecture according to an embodiment of the present application. According to Figure 2 As shown, the cable joint monitoring system adopts a hierarchical distributed network structure, which is divided into a sensing layer, a network layer and an application layer. The sensing layer is responsible for data acquisition, the network layer is responsible for data transmission, and the application layer is responsible for data processing and display.

[0043] Specifically, in the sensing layer, STM32 series chips or other high-performance microprocessors are used to realize the real-time acquisition of data from each sensor. The data acquisition module should have the ability to acquire multi-channel data, be able to acquire data from multiple sensors simultaneously, and perform digital preprocessing on the acquired data to ensure the accuracy and integrity of the data.

[0044] In the transmission layer, wireless communication technologies such as 4G / 5G, NB-IoT, and LoRa are used to achieve fast data transmission. These technologies have the characteristics of low power consumption, wide coverage, and high reliability, and are suitable for use in the complex environment of cable wells. In specific cases, fiber optic communication technology can be used to ensure the security and stability of data transmission. At the same time, standard communication protocols (such as MQTT, CoAP, etc.) are adopted to ensure the efficiency and reliability of data transmission.

[0045] In the application layer, the cable joint monitoring system also includes a cloud server and a visualization platform. The cloud server includes a data receiving module, a database, and an analysis module that are communicatively connected. The data receiving module is communicatively connected to all the cable joint monitoring devices, and the data receiving module is used for monitoring data of cable joints and cable wells. The database is used to store and back up the monitoring data. The analysis module can adopt algorithms such as machine learning and artificial intelligence to deeply analyze the acquired data, identify potential faults and abnormal situations, and provide early warnings and decision-making support. The visualization platform is communicatively connected to the analysis module, and through Web or mobile applications, realizes the real-time display and management of data. Users can view information such as the operating status of cable wells, environmental parameters, and fault warnings through the visualization interface.

[0046] In one embodiment, the specific implementation steps of the cable joint monitoring method are as follows:

[0047] An explosion-proof box is set outside the cable joint; a cable joint fire monitoring mechanism is set on the explosion-proof box, which is used to monitor the smoke, temperature and partial discharge at the cable joint. When the cable temperature exceeds the set threshold or smoke is generated, corresponding alarm prompts are sent to the cloud server through the built-in microprocessor and communication module; a manhole cover monitoring unit is set at the manhole cover of the cable shaft, which is used to monitor the position and state of the manhole cover. When the manhole cover tilts or moves, real-time monitoring is carried out through the built-in microprocessor and communication module and corresponding alarm status prompts are sent to the cloud server; a well-internal temperature monitoring unit and a well-bottom water level monitoring unit are set in the cable shaft, which are used to monitor the well-internal temperature and the well-bottom water level in real time. When the well-internal temperature or water level exceeds the set threshold, corresponding alarm prompts are sent to the cloud server through the built-in microprocessor and communication module; the cloud server receives, stores and backs up the monitoring data, generates a monitoring report based on the monitoring data, generates an alarm instruction when the monitoring report meets the preset alarm conditions, and sends a start command to the fire extinguishing mechanism set in the cable shaft when it is judged that a fire occurs. At the same time, the visualization platform displays the monitoring report and the alarm instruction; the fire extinguishing mechanism starts the fire extinguishing measures according to the received command.

[0048] In addition, in one embodiment, manual start and stop buttons are provided at the exit of the cable shaft protection area, which are used to confirm the fire and manually start or stop the fire extinguishing device. The manual control method ensures that when the fire alarm system fails to respond in time, personnel can manually operate the fire extinguishing device. During the delay time, if an abnormal situation is found, the release of the fire extinguishing agent can be stopped through the emergency stop button in the manual control box.

[0049] The cable joint monitoring device according to the embodiment of the present application realizes intelligent control through the cloud server, uploads the data of each monitoring terminal to the cloud in real time, and operation and maintenance personnel can remotely access and monitor through terminal devices such as mobile phones and computers. This remote monitoring ability not only breaks through geographical restrictions, enabling operation and maintenance personnel to master the real-time status of cable joints anytime and anywhere, but also improves the response speed and processing efficiency. In addition, the cloud server also supports the intelligent fire extinguishing function. Once a fire hazard is detected, the system will immediately start the fire extinguishing program, quickly extinguish the fire source by spraying the fire extinguishing agent or starting other fire extinguishing equipment. At the same time, the cloud server will also synchronously display the real-time status and data of each terminal, providing an intuitive and comprehensive monitoring picture for operation and maintenance personnel, facilitating them to make accurate judgments and decisions. This intelligent control not only improves the safety of the power system, but also reduces the operation and maintenance cost and improves the operation and maintenance efficiency.

[0050] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cable joint monitoring device, characterized in that: include: An explosion-proof box, arranged outside the cable connector to protect the cable connector; The monitoring mechanism includes a cable joint fire monitoring mechanism and a cable well monitoring mechanism, wherein the cable joint fire monitoring mechanism is externally disposed on the explosion-proof box and is used to monitor smoke, temperature and partial discharge at the cable joint, and the cable well monitoring mechanism is disposed in the cable well where the cable joint is placed and is used to monitor the position and state of the well cover, the well temperature and the well water level; Fire extinguishing mechanism, used to extinguish fire when fire is detected; and A power supply module, the power supply module is electrically connected to the monitoring mechanism and the fire extinguishing mechanism and is used to provide power to the monitoring mechanism and the fire extinguishing mechanism; The cable joint fire monitoring mechanism, the cable well monitoring mechanism and the fire extinguishing mechanism are communicatively connected to jointly realize real-time monitoring of the cable joint and cable well environment, and trigger an alarm and activate the fire extinguishing mechanism when an abnormality is detected.

2. The cable joint monitoring device according to claim 1, characterized in that: The cable joint fire monitoring mechanism comprises: Smoke sensors to monitor smoke inside cable connectors; Temperature sensors for monitoring the temperature of the cells in the cable connector and the environment inside the cable connector; and Current sensors for partial discharge monitoring; The smoke sensor, the temperature sensor and the current sensor are electrically connected, and send corresponding alarm prompts when the cable temperature exceeds a set threshold or smoke is generated.

3. The cable joint monitoring device according to claim 1, characterized in that: The cable well monitoring mechanism includes a well cover monitoring unit, a well temperature monitoring unit and a downhole water level monitoring unit, wherein: The manhole cover monitoring unit is arranged at the manhole cover and is used to monitor the position and state of the manhole cover. When the manhole cover is tilted or displaced, the manhole cover monitoring unit monitors in real time and sends a corresponding alarm status prompt; The well temperature monitoring unit is arranged at the well wall, and is used to monitor the well temperature in real time, and send a corresponding alarm prompt when the well temperature exceeds a set threshold; and The underground water level monitoring unit is arranged at the well wall and is used to monitor the underground water level in real time, and When the underground water level rises above the set threshold, a corresponding alarm prompt is sent.

4. The cable joint monitoring device according to claim 1, characterized in that: The monitoring module also includes a microprocessor and an NB-IoT communication module, which are used to realize real-time, multi-channel collection and transmission of data.

5. The cable joint monitoring device according to claim 1, characterized in that: The fire extinguishing mechanism is a perfluorohexanone fire extinguishing device, and the fire extinguishing operation is started when the fire extinguishing mechanism receives a corresponding alarm signal.

6. A cable joint monitoring system, characterized in that: include: A cloud server, a visualization platform and a plurality of cable joint monitoring devices as described in any one of claims 1 to 5, wherein the cloud server comprises a data receiving module, a database and an analysis module which are communicatively connected; the data receiving module is communicatively connected to all the cable joint monitoring devices, and the data receiving module is used for monitoring data of cable joints and cable wells; the database is used to store and back up the monitoring data; the analysis module is used to generate a monitoring report based on all the monitoring data, and to generate an alarm instruction when the monitoring report meets a preset alarm condition; the visualization platform is communicatively connected to the analysis module, and the visualization platform is used to display the monitoring report and the alarm instruction.

7. A cable joint monitoring method, characterized in that: The method comprises the following steps: An explosion-proof box is provided outside the cable connector; A cable joint fire monitoring mechanism is provided on the explosion-proof box to monitor smoke, temperature and partial discharge at the cable joint. When the cable temperature exceeds a set threshold or smoke is generated, a corresponding alarm prompt is sent to the cloud server through a built-in microprocessor and a communication module; A manhole cover monitoring unit is set at the manhole cover of the cable well to monitor the position and status of the manhole cover. When the manhole cover is tilted or displaced, the built-in microprocessor and communication module monitor in real time and send the corresponding alarm status prompt to the cloud server; A well temperature monitoring unit and a downhole water level monitoring unit are set in the cable well to monitor the downhole temperature and downhole water level in real time. When the downhole temperature or water level exceeds the set threshold, the built-in microprocessor and communication module send a corresponding alarm prompt to the cloud server; The cloud server receives, stores and backs up the monitoring data, generates a monitoring report based on the monitoring data, generates an alarm instruction when the monitoring report meets the preset alarm conditions, and issues a start command to the fire extinguishing mechanism set in the cable well when it is determined that a fire has occurred. At the same time, the visualization platform displays the monitoring report and the alarm instruction; The fire extinguishing agency initiates fire extinguishing measures according to the received command.

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