Integrated device for intelligent monitoring and emergency protection of power cable joint and monitoring method

Abstract

The application discloses an integrated device for intelligent monitoring and emergency protection of a power cable joint, comprising an explosion-proof housing for sealingly wrapping the cable joint and filling the cable joint with fire-retardant gas; a temperature monitoring device for collecting real-time temperature of the cable joint is installed in the explosion-proof housing; the temperature monitoring device is in communication connection with a wireless energy transceiving device arranged outside the explosion-proof housing and installed on a cable connected with the cable joint; compared with an active temperature measuring device, the device is powered by external microwave energy in a point-to-point mode, has a long service life and is higher in reliability and safety; compared with a passive temperature measuring device, the device is high in precision, fixed in a transceiving position, free of repeated alignment operation and less affected by the environment.

Description

Technical Field

[0001] This invention relates to the field of power equipment protection devices, and more particularly to the field of power cable condition detection and accident early warning devices and methods, specifically to an integrated device and method for intelligent monitoring and emergency protection of power cable joints. Background Technology

[0002] High-voltage power grids are an indispensable part of power transmission. For cities with concentrated electricity consumption, the traditional overhead power grid is no longer in line with current urban planning standards and also poses significant safety hazards. Therefore, underground pipelines have replaced overhead installations. Ensuring the stability and safety of underground high-voltage power grids is of paramount importance. Research has found that cable joints are the weakest link in the entire cable line. Over 90% of cable failures occur at the joints between cables. Grounding or short-circuit arcing at cable joints can easily lead to explosions, or the resulting open flames can ignite nearby cables and other flammable materials in the tunnel, greatly increasing the fire hazard. Furthermore, due to the unique structure of cable tunnels, once a fire starts, it will spread rapidly within the tunnel, causing widespread power outages and resulting in huge economic losses. Therefore, comprehensive online monitoring of the operating status of cable joints is crucial for the safe operation of underground power grids.

[0003] Ensuring the safe operation of the power grid and improving the management efficiency of the power sector are both crucial. Existing cable monitoring technologies can be categorized into active and passive detection methods from an energy supply perspective, each with its own advantages and disadvantages. Active temperature measurement devices convert temperature data into digital signals using temperature sensors, which are then transmitted to a wireless signal transmission module and sent to a digital terminal according to a specific communication protocol. Because these devices use active components, lithium batteries are often required as the power source for the sensors. However, due to the limited capacity of lithium batteries, active temperature measurement devices require battery replacement after a period of operation. Furthermore, during replacement, the position of the temperature measurement device needs to be recalibrated to ensure good wireless signal reception. This process is not only inefficient but also requires significant manual labor.

[0004] One type of passive temperature measurement device utilizes the linear relationship between the resonant frequency of an internal resonator in a temperature sensor and temperature for measurement. When the ambient temperature changes, the parameters of the sensor substrate change accordingly, thereby altering its resonant frequency. Because this type of temperature measurement device does not use active components, it does not require an external power supply. However, since the change in the resonant frequency of the resonator is not only related to temperature changes but is also affected by other factors such as the device's installation location, its temperature measurement accuracy is lower than that of active temperature measurement devices.

[0005] Based on this, the present invention proposes a brand-new power supply and monitoring scheme that combines the actual working conditions of existing ground wire high-voltage cable networks. This scheme can achieve the technical effects of existing active monitoring methods while being compatible with the convenience of passive monitoring methods, and overcomes the problems of low energy storage, low usage frequency, and short continuous working time of active monitoring methods. Summary of the Invention

[0006] To address the problems associated with existing high-voltage cable joint temperature monitoring, this application provides a novel integrated intelligent monitoring and emergency protection device and method for power cable joints, serving as a replacement for existing high-voltage cable joint temperature monitoring methods. To simply and intuitively highlight the differences and technical advantages of this invention compared to existing technologies, the applicant first briefly describes the typical existing monitoring methods and the main technical challenges they face as follows:

[0007] Active monitoring systems, due to their independent power supply components such as built-in lithium batteries, supercapacitors, or a combination thereof, offer very high operational stability and satisfactory monitoring results. However, their main drawback is the short continuous monitoring time, typically requiring intermittent operation. For example, a system set to perform discrete data acquisition 24 hours a day only needs to collect data once a day, with each acquisition cycle, from wake-up to acquisition and data transmission, taking approximately 10 seconds. This discrete acquisition significantly extends the actual effective monitoring time. Lower acquisition frequencies result in longer effective lifespans; however, lower frequencies also lead to lower acquisition effectiveness and less timely warnings. Generally, cable joint failures progress from initial heating to rapid heating, and even deflagration or explosion, which can occur within a very short time. Therefore, excessively low acquisition frequencies can prevent timely warnings. Increasing the frequency raises concerns about the effective lifespan of active acquisition methods. Since underground cables are located in tunnels or wells, manual periodic replacement is not suitable for resolving power supply issues, thus the drawbacks of active monitoring remain significant.

[0008] On the other hand, passive monitoring typically uses the resonant frequency change of a resonator to infer temperature changes. This is a passive acquisition method, whose biggest advantage is that it can ensure timely temperature acquisition while allowing uninterrupted data collection, avoiding the large blind spots found in active monitoring systems. However, due to the complex electric field environment at the location of high-voltage cable joints, the resonator is easily affected by other surrounding factors. Therefore, the acquired temperature includes, but is not limited to, actual temperature changes, as well as other uncontrollable factors, which directly leads to distortion of the temperature information obtained by the backend. Since the accuracy and timeliness of monitoring the temperature of cable joints are the most critical and important considerations, passive monitoring also has its drawbacks.

[0009] To address this issue, the applicant has proposed a novel solution based on long-term practical experience in power cable monitoring. This solution avoids the problems of insufficient continuous operation time in existing active monitoring systems and inaccurate data collection in passive monitoring systems. The specific technical solution adopted in this application is as follows:

[0010] The integrated intelligent monitoring and emergency protection device for power cable joints provided in this application includes an explosion-proof housing for sealing and filling the cable joint with a flame-retardant gas. A temperature monitoring device for collecting the real-time temperature of the cable joint is installed inside the explosion-proof housing. The temperature monitoring device is communicatively connected to a wireless energy transceiver device that is installed outside the explosion-proof housing and on the cable connected to the cable joint.

[0011] The temperature monitoring device includes a transceiver antenna B, a temperature sensor disposed on the surface of the cable connector for real-time temperature monitoring, and a first encapsulation module for supplying power to the temperature sensor and acquiring the temperature electrical signal acquired by the temperature sensor and transmitting it through the transceiver antenna B.

[0012] The wireless power transceiver includes a transceiver antenna A that is communicatively connected to a transceiver antenna B, a second encapsulation module connected to the transceiver antenna A and used for processing received signals and transmitting microwave energy, and a first inductive power extraction unit and a second inductive power extraction unit disposed on a cable for supplying power to the second encapsulation module.

[0013] To facilitate the filling of the explosion-proof housing with flame-retardant gas after installation, preferably, a first valve and a second valve, communicating with the interior of the explosion-proof housing, are installed near both ends of the housing. A transparent sleeve can also be detachably installed on the first or second valve. The method for injecting the flame-retardant gas is as follows: First, connect the transparent sleeve to the first or second valve. Connect a container / equipment filled with carbon dioxide or nitrogen to the first or second valve without the transparent sleeve. Place a lit short candle into the transparent sleeve. First, open the first valve at the end connected to the transparent sleeve and observe the candle. If it remains lit for a few seconds, slowly open the second valve, allowing the flame-retardant gas to slowly flow into the explosion-proof housing from the other end, preventing airflow from passing through and extinguishing the candle. Continue injecting the flame-retardant gas until the candle extinguishes naturally, then close the second valve to stop the gas injection. Remove the candle, relight it, and slowly open the second valve again to fill the transparent sleeve with flame-retardant gas. Place the lit candle back into the sleeve and observe whether it extinguishes immediately. If it does, close the first valve, then the second valve, to ensure there is no oxygen or the oxygen content is very low inside the explosion-proof enclosure. This method helps prevent open flames in the event of a power cable fault, before emergency personnel arrive or the power is cut off, thus minimizing the impact on surrounding cables or other equipment and reducing potential damage or loss.

[0014] Preferably, the first encapsulation module includes a communication module electrically connected to the temperature sensor, a transceiver module B for receiving electrical signals from the communication module, and an energy harvesting module and a power management module connected in sequence to the transceiver module B. The power management module is electrically connected to the temperature sensor and the communication module respectively and continuously supplies power. The transceiver module B includes the transceiver antenna B. This application encapsulates all unnecessary exposed components for ease of installation and to protect the components from changes in the state of the cable connectors.

[0015] Furthermore, the transceiver module B also includes a second transceiver isolation module connected to the energy harvesting module and the communication module respectively. The second transceiver isolation module is also connected to a transceiver antenna B, and a wireless transmission connection is established between the transceiver antenna B and the transceiver antenna A.

[0016] Similarly, with the same principle and function as the first encapsulation module 23, the second encapsulation module includes a main control unit electrically connected to the first inductive power supply unit and the second inductive power supply unit respectively, a high-power microwave source connected in sequence to the main control unit, a transceiver module A, a signal receiving module, and a signal processing and control module, wherein the signal processing and control module is communicatively connected to the main control unit; the transceiver module A includes the transceiver antenna A.

[0017] Furthermore, the transceiver module A also includes a first transceiver isolation module that is connected to the high-power microwave source and the signal receiving module respectively. The first transceiver isolation module is also connected to a transceiver antenna A, and a wireless transmission connection is established between the transceiver antenna A and the transceiver module B.

[0018] Preferably, both the first transceiver isolation module and the second transceiver isolation module include a first bandpass filter and a second bandpass filter. The first bandpass filter allows microwave energy with an operating frequency of f1 to pass through while blocking data signals with an operating frequency of f2 from passing through. The second bandpass filter blocks microwave energy with an operating frequency of f1 from passing through while allowing data signals with an operating frequency of f2 to pass through.

[0019] More preferably, the energy harvesting module includes an impedance matching network connected to the second transceiver isolation module, the impedance matching network being electrically connected in sequence to a rectifier circuit and a filter network, and the filter network being electrically connected to the power management module.

[0020] In a further preferred embodiment, the communication module and the transceiver module B communicate via an ATK-LORA-01 / 02 wireless serial port; the temperature sensor is a DS18B20; the rectifier circuit uses a pair of diodes, wherein the diodes are HSMS2822; the high-power microwave source has a center frequency of 5.8GHz and an output power of 10W; and the power management module is a BQ25504.

[0021] This invention also provides a monitoring method, based on the integrated intelligent monitoring and emergency protection device for power cable joints provided in this application, specifically including the following steps:

[0022] Step STP100, the step of generating and transmitting microwave energy: Power is drawn from the first inductive power unit and / or the second inductive power unit to supply power to the main control unit. The main control unit sends an instruction to the high-power microwave source according to the preset program, so that the high-power microwave source generates microwave energy and transmits it to the transceiver antenna A through the first transceiver isolation module and then transmits it out, thus completing the generation and transmission of microwave energy.

[0023] Step STP200, receiving microwave energy and triggering temperature monitoring: Transceiver antenna B receives microwave energy emitted by transceiver antenna A and transmits it to the energy harvesting module through the second transceiver isolation module. The energy harvesting module converts the received microwave energy into electrical energy and stores it in the power management module through an impedance matching network, rectifier circuit and filter circuit. The power management module supplies power to the temperature sensor to start real-time temperature monitoring.

[0024] Step STP300, receiving temperature information: converting the electrical signal carrying temperature into wireless data and sending it to transceiver antenna A. Transceiver antenna A processes the wireless data through the first transceiver isolation module and sends it sequentially to the signal receiving module. The signal processing and control module obtains a digital signal that can be displayed and feeds it back to the main control unit. The main control unit then issues commands including display, reminders, and alarms based on the comparison between the received temperature value and the preset safety threshold.

[0025] Beneficial effects:

[0026] First, compared with active temperature measuring devices, this device is powered point-to-point by external microwave energy, which has a longer lifespan and higher reliability and safety; compared with passive temperature measuring devices, it has higher accuracy, fixed transmitting and receiving positions, no need for repeated alignment operations, and is less affected by the environment.

[0027] Secondly, the device of the present invention utilizes a single transceiver antenna for both power transmission and communication. At the same time, the antenna and the device under test adopt a conformal design, which reduces the size and facilitates installation and use in switch cabinet environments. Furthermore, the device of the present invention contains signal processing and control modules between the information link and the energy link, forming a closed-loop feedback, which enhances reliability.

[0028] Third, the present invention uses microwave / signal transmission to truly achieve the integration of the explosion-proof enclosure, eliminating the need to drill wire holes in the explosion-proof enclosure, thereby fundamentally avoiding the problems of the airtightness and explosion-proof strength of the explosion-proof enclosure.

[0029] Fourth, the present invention fills the explosion-proof housing with flame-retardant gas to replace the fire extinguishing unit in the existing explosion-proof box, which can further reduce energy consumption and achieve the same flame-retardant purpose; in addition, the cost of filling with flame-retardant gas is lower than that of the built-in fire extinguishing unit, and the operation is simple and more conducive to widespread use. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an isometric schematic diagram of the structure of the present invention.

[0032] Figure 2 yes Figure 1 Full sectional view with the central section symbol AA.

[0033] Figure 3 This is a block diagram illustrating the working principle of the present invention.

[0034] Figure 4 This is a schematic diagram of the isolation module's filtering principle for energy and signals.

[0035] Figure 5 This is a block diagram illustrating the principle of the energy harvesting module.

[0036] Figure 6 This is a block diagram of the energy harvesting module.

[0037] In the diagram: 0-Cable connector; 1-Explosion-proof housing; 2-Temperature monitoring device; 21-Transceiver antenna B; 22-Temperature sensor; 23-First encapsulation module; 3-Wireless power transceiver; 31-Transceiver antenna A; 32-First inductive power extraction unit; 33-Second encapsulation module; 34-Second inductive power extraction unit; 4-First valve; 5-Transparent sleeve; 6-Second valve. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0043] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] Example 1:

[0045] Refer to the instruction manual. Figures 1-3 The integrated intelligent monitoring and emergency protection device for power cable joints provided in this embodiment includes an explosion-proof housing 1 for sealing and filling the cable joint 0 with flame-retardant gas. A temperature monitoring device 2 for collecting the real-time temperature of the cable joint 0 is installed inside the explosion-proof housing 1. The temperature monitoring device 2 is communicatively connected to a wireless energy transceiver 3 that is installed outside the explosion-proof housing 1 and on the cable connected to the cable joint 0.

[0046] The temperature monitoring device 2 includes a transceiver antenna B21, a temperature sensor 22 disposed on the surface of the cable connector 0 for real-time temperature monitoring, and a first encapsulation module 23 for supplying power to the temperature sensor 22 and collecting the temperature electrical signal collected from the temperature sensor 22 and transmitting it through the transceiver antenna B21.

[0047] The wireless power transceiver 3 includes a transceiver antenna A31 that is communicatively connected to the transceiver antenna B21, a second encapsulation module 33 connected to the transceiver antenna A31 and used for processing received signals and transmitting microwave energy, and a first inductive power extraction unit 32 and a second inductive power extraction unit 34 disposed on a cable for supplying power to the second encapsulation module 33.

[0048] Brief description of working principle:

[0049] The wireless power transceiver 3 installed on the cable generates microwave energy through inductive power from the cable and transmits it to transceiver antenna B21 via transceiver antenna A. This allows the temperature detection device 2 installed inside the explosion-proof housing 1 to receive the microwave energy and convert it into electrical energy to power the temperature sensor 22, which collects the real-time temperature of the cable joint 0. The temperature signal is then transmitted to transceiver antenna B in the wireless power transceiver 3 via transceiver antenna A. Finally, the temperature signal is sent by the wireless power transceiver 3 to the backend server for further processing, such as issuing display, warning, alarm, and troubleshooting instructions.

[0050] Example 2:

[0051] This embodiment is a further improvement and optimization based on Embodiment 1. In order to facilitate the filling of the explosion-proof housing 1 with flame-retardant gas after the explosion-proof housing 1 is installed, and in conjunction with the appendix to the instruction manual... Figure 1 and Figure 2 As shown, the explosion-proof housing 1 has a first valve 4 and a second valve 6 installed near its two ends, respectively, communicating with the interior of the explosion-proof housing 1. A transparent sleeve 5 can also be detachably installed on the first valve 4 or the second valve 6. The method for injecting flame-retardant gas is as follows: First, connect the transparent sleeve 5 to the first valve 4 or the second valve 6. Connect a container / equipment filled with carbon dioxide or nitrogen to the first valve 4 or the second valve 6 without the transparent sleeve 5. Place a lit short candle into the transparent sleeve 5. First, open the first valve 4 at the end connected to the transparent sleeve 5 and observe the candle. If it remains lit for 5 seconds and is still not extinguished, slowly open the second valve 6, allowing the flame-retardant gas to slowly flow into the explosion-proof housing 1 from the other end, preventing airflow from passing through and extinguishing the candle. Continue injecting the flame-retardant gas until the candle extinguishes naturally, then close the second valve 6 to stop the gas injection. Remove the candle, relight it, and slowly open the second valve 6 again to fill the transparent sleeve 5 with flame-retardant gas. Place the lit candle back into the transparent sleeve 5 and observe whether it extinguishes immediately. If it extinguishes immediately, close the first valve 4, then close the second valve 6 to ensure that there is no oxygen or the oxygen content is very low inside the explosion-proof housing 1. This method helps to prevent open flames as much as possible in the event of a power cable fault, before emergency personnel arrive or the power is cut off, thus minimizing the impact on surrounding cables or other equipment and reducing potential damage or loss.

[0052] In this embodiment, combined with Figure 3As shown, the first encapsulation module 23 includes a communication module electrically connected to the temperature sensor 22, and a transceiver module B for receiving electrical signals from the communication module. The transceiver module B is also sequentially connected to an energy harvesting module and a power management module. The power management module is electrically connected to the temperature sensor 22 and the communication module respectively and continuously supplies power. The transceiver module B includes the transceiver antenna B. This application encapsulates all unnecessary exposed components for ease of installation and to protect the components from being affected by changes in the state of the cable connectors. The transceiver module B also includes a second transceiver isolation module connected to the energy harvesting module and the communication module respectively. The second transceiver isolation module is also connected to the transceiver antenna B, and a wireless transmission connection is established between the transceiver antenna B and the transceiver antenna A.

[0053] Similarly, with the same principle and function as the first packaging module 23, the second packaging module 33 includes a main control unit electrically connected to the first inductive power supply unit 32 and the second inductive power supply unit 34, a high-power microwave source, a transceiver module A, a signal receiving module, and a signal processing and control module connected sequentially to the main control unit. The signal processing and control module is communicatively connected to the main control unit. The transceiver module A includes the transceiver antenna A31. The transceiver module A also includes a first transceiver isolation module connected to the high-power microwave source and the signal receiving module, and the first transceiver isolation module is also connected to the transceiver antenna A. A wireless transmission connection is established between the transceiver antenna A and the transceiver module B.

[0054] Further refer to the instruction manual. Figures 4-6 As shown, both the first and second transceiver isolation modules include a first bandpass filter and a second bandpass filter. The first bandpass filter allows microwave energy at operating frequency f1 to pass through while blocking data signals at operating frequency f2. The second bandpass filter blocks microwave energy at operating frequency f1 while allowing data signals at operating frequency f2 to pass through. The energy harvesting module includes an impedance matching network connected to the second transceiver isolation module. The impedance matching network is electrically connected to a rectifier circuit and a filter network in sequence. The filter network is electrically connected to the power management module.

[0055] As a preferred option in this application, in this embodiment, the communication module and the transceiver module B communicate via ATK-LORA-01 / 02 wireless serial port communication, the temperature sensor is a DS18B20, the rectifier circuit uses a pair of diodes, wherein the diodes are of type HSMS2822, the high-power microwave source has a center frequency of 5.8GHz and an output power of 10W, and the power management module is of type BQ25504.

[0056] Example 3:

[0057] This embodiment provides a monitoring method based on the integrated intelligent monitoring and emergency protection device for power cable joints provided in Embodiment 2, specifically including the following steps:

[0058] Step STP100, the step of generating and transmitting microwave energy: Power is drawn from the first inductive power unit 32 and / or the second inductive power unit 34 to supply power to the main control unit. The main control unit sends an instruction to the high-power microwave source according to the preset program, so that the high-power microwave source generates microwave energy and transmits it to the transceiver antenna A31 through the first transceiver isolation module and then emits it, thus completing the generation and transmission of microwave energy. The high-power microwave source sends the generated microwave energy into the first transceiver isolation module through port P1, and then outputs it to the transceiver antenna A through port P3 and radiates it out. When the transceiver antenna B receives the microwave energy, it enters the second transceiver isolation module through port P4 and outputs it to the energy harvesting module through port P5 for subsequent energy conversion to obtain DC power for power supply.

[0059] Step STP200, receiving microwave energy and triggering temperature monitoring: Transceiver antenna B21 receives microwave energy emitted by transceiver antenna A31 and transmits it to the energy harvesting module through the second transceiver isolation module. The energy harvesting module converts the received microwave energy into electrical energy and stores it in the power management module through an impedance matching network, rectifier circuit and filter circuit. The power management module supplies power to the temperature sensor to start real-time temperature monitoring.

[0060] Step STP300, receiving temperature information: The electrical signal carrying temperature is converted into wireless data and sent to transceiver antenna A31. Transceiver antenna A processes the wireless data through the first transceiver isolation module and sequentially sends it to the signal receiving module. The signal processing and control module obtains a displayable digital signal and feeds it back to the main control unit. The main control unit then issues commands, including display, reminders, and alarms, based on the received temperature value compared with a preset safety threshold. Specifically, the temperature sensor sends the collected temperature data to the communication module, enters the second transceiver isolation module through port P6, and finally transmits it to transceiver antenna B through port P4. After receiving the data information from transceiver antenna B, transceiver antenna A enters the first transceiver isolation module through port P3 and sends it to the signal receiving module through port P2. After comparison processing by the signal processing and control module, it is sent to the background control server for display, storage, and / or alarm prompts. In the above process, ports P1 and P2 are isolated from each other, and ports P5 and P6 are isolated from each other, which prevents interference between energy and data when transmitting through a shared antenna.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated intelligent monitoring and emergency protection device for power cable joints, characterized in that: The device includes an explosion-proof housing (1) for sealing and filling a cable joint (0) with a flame-retardant gas, characterized in that: a temperature monitoring device (2) for collecting the real-time temperature of the cable joint (0) is installed inside the explosion-proof housing (1); the temperature monitoring device (2) is communicatively connected to a wireless energy transceiver device (3) disposed outside the explosion-proof housing (1) and installed on the cable connected to the cable joint (0); the temperature monitoring device (2) includes a transceiver antenna B (21), a temperature sensor (22) disposed on the surface of the cable joint (0) for real-time temperature monitoring, and a device for... The wireless energy transceiver device (3) includes a first encapsulation module (23) that supplies power to the temperature sensor (22) and collects the temperature electrical signal collected from the temperature sensor (22) and transmits it through the transceiver antenna B (21); the wireless energy transceiver device (3) includes a transceiver antenna A (31) that is communicatively connected to the transceiver antenna B (21), a second encapsulation module (33) that is connected to the transceiver antenna A (31) and is used to process the received signal and transmit microwave energy, and a first inductive power extraction unit (32) and a second inductive power extraction unit (34) that are disposed on the cable for supplying power to the second encapsulation module (33); The explosion-proof housing (1) is equipped with a first valve (4) and a second valve (6) that communicate with the interior of the explosion-proof housing (1) near its two ends. A transparent sleeve (5) can also be detachably installed on the first valve (4) or the second valve (6). The first encapsulation module (23) includes a communication module electrically connected to the temperature sensor (22) and a transceiver module B for receiving electrical signals from the communication module. The transceiver module B is also connected in sequence to an energy harvesting module and a power management module. The power management module is electrically connected to the temperature sensor (22) and the communication module and continuously supplies power. The transceiver module B includes the transceiver antenna B. The transceiver module B further includes a second transceiver isolation module connected to the energy harvesting module and the communication module respectively. The second transceiver isolation module is also connected to a transceiver antenna B, and the transceiver antenna B establishes a wireless transmission connection with the transceiver antenna A. The second packaging module (33) includes a main control unit electrically connected to the first inductive power harvesting unit (32) and the second inductive power harvesting unit (34) respectively, a high-power microwave source, a transceiver module A, a signal receiving module, and a signal processing and control module connected in sequence to the main control unit. The signal processing and control module is communicatively connected to the main control unit. The transceiver module A includes the transceiver module A. Antenna A (31); The transceiver module A further includes a first transceiver isolation module connected to the high-power microwave source and the signal receiving module respectively. The first transceiver isolation module is also connected to the transceiver antenna A. The transceiver antenna A establishes a wireless transmission connection with the transceiver module B. The first transceiver isolation module and the second transceiver isolation module both include a first bandpass filter and a second bandpass filter. The first bandpass filter allows microwave energy with a working frequency of f1 to pass through and blocks data signals with a working frequency of f2 to pass through. The second bandpass filter blocks microwave energy with a working frequency of f1 to pass through and allows data signals with a working frequency of f2 to pass through.

2. The integrated intelligent monitoring and emergency protection device for power cable joints according to claim 1, characterized in that: The energy harvesting module includes an impedance matching network connected to the second transceiver isolation module. The impedance matching network is electrically connected to a rectifier circuit and a filter network in sequence. The filter network is electrically connected to the power management module.

3. The integrated intelligent monitoring and emergency protection device for power cable joints according to claim 2, characterized in that: The communication module communicates with transceiver module B via ATK-LORA-01 / 02 wireless serial port. The temperature sensor is a DS18B20. The rectifier circuit uses a pair of diodes, specifically the HSMS2822 diodes. The high-power microwave source has a center frequency of 5.8GHz and an output power of 10W. The power management module is a BQ25504.

4. A monitoring method, characterized in that, The integrated intelligent monitoring and emergency protection device for power cable joints as described in claim 3 is implemented by the following steps: Step STP100, the step of generating and transmitting microwave energy: power is drawn from the first inductive power unit (32) and / or the second inductive power unit (34) to supply power to the main control unit. The main control unit sends an instruction to the high-power microwave source according to the preset program so that the high-power microwave source generates microwave energy and transmits it to the transceiver antenna A (31) through the first transceiver isolation module and then transmits it out, thus completing the generation and transmission of microwave energy. Step STP200, receiving microwave energy and triggering temperature monitoring: Transceiver antenna B (21) receives microwave energy emitted by transceiver antenna A (31) and transmits it to the energy collection module through the second transceiver isolation module. The energy collection module converts the received microwave energy into electrical energy and stores it in the power management module through the impedance matching network, rectifier circuit and filter circuit. The power management module supplies power to the temperature sensor to start real-time temperature monitoring. Step STP300, receiving temperature information: converting the electrical signal with temperature into wireless data and sending it to transceiver antenna A (31). Transceiver antenna A processes the wireless data through the first transceiver isolation module and sends it to the signal receiving module in sequence. The signal processing and control module obtains a digital signal that can be displayed and feeds it back to the main control unit. The main control unit issues instructions including display, reminder and alarm based on the comparison between the received temperature value and the preset safety threshold.

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