An overhead cable joint live temperature measuring device and installation method

Abstract

The application provides an overhead cable joint live temperature measuring device and a mounting method, which comprises a surface acoustic wave temperature sensor mounted on the surface of an overhead cable joint through an arc-shaped fixing member and a mounting thimble; a monitoring distribution box, which is provided with a hanger for being connected with a hoop buckle; an insulating rod tool, which comprises an insulating rod main body and a threaded hole arranged on the top of the insulating rod main body, and the threaded hole can alternatively connect a sensor mounting bracket or a distribution box mounting bracket, so as to respectively realize the mounting of the sensor on the overhead cable joint and the mounting of the monitoring distribution box on a tower pole supporting the overhead cable in a live state; the surface acoustic wave temperature sensor realizes passive temperature collection through a reflection delay line structure, and transmits temperature information to the monitoring distribution box through a radio frequency signal of a unique frequency band. The application can realize the quick mounting and dismounting of the overhead line joint temperature measurement in a live state, and has the advantages of convenient installation and strong system independence.

Description

Technical Field

[0001] This invention relates to the field of sensor and online temperature measurement technology for power cables, specifically to an overhead cable joint live temperature measurement device and its installation method. Background Technology

[0002] Overhead power transmission and distribution systems are widely used in urban and rural power networks, providing stable power to factories, residential areas, and commercial centers. In terms of safety, the design, construction, and maintenance of overhead lines must strictly adhere to national and industry safety standards to prevent accidents such as electric shock and fire. Furthermore, power companies must regularly inspect and maintain overhead lines to ensure they are always in good working order.

[0003] In overhead power transmission and distribution systems, cable splices are high-risk areas for faults. Loosening, aging, and arcing of cable conduits and clamps can lead to insulation breakdown or increased contact resistance, causing the contact temperature to rise continuously and posing a safety hazard to the power supply system. If not detected promptly, this can easily result in fires, explosions, large-scale power outages, and casualties, causing significant direct and indirect economic losses. Therefore, online monitoring of the operating temperature of cable splices and crimp joints in overhead lines and timely elimination of potential hazards are increasingly recognized and valued within the industry.

[0004] Because overhead power lines are mostly distributed in urban peripheries and rural areas, covering a wide area and with complex environments, the current method of manually inspecting cable joints for operating temperature monitoring is not only inefficient but also prone to causing personal injury. Conventional online monitoring technologies also have many shortcomings in terms of reliability and maintainability for this application scenario. Existing online monitoring devices are mostly electronic detection technologies, which cannot meet the application requirements of high reliability, maintenance-free operation, and a lifespan comparable to that of primary equipment.

[0005] In addition, online temperature monitoring of overhead line cable joints requires the installation of temperature monitoring sensors and devices. However, the installation of these sensors and devices involves power outages, which is an unbearable burden for a wide range of power users and limits the application of the product.

[0006] Therefore, there is an urgent need for a device and installation method that can be quickly installed while the circuit is energized and can achieve real-time and stable monitoring of the joint temperature. Summary of the Invention

[0007] This invention provides an overhead cable joint live temperature measuring device and installation method. Based on the principle of surface acoustic wave sensing technology, this invention directly measures the temperature of the overhead cable joint and the heating point of the contact in the live state, which solves the problem of installing temperature measuring devices in the live operation of overhead lines and realizes the monitoring of cable joint faults in the already put into operation.

[0008] In a first aspect, the present invention provides a live temperature measuring device for an overhead cable joint, the device comprising: A surface acoustic wave temperature sensor, wherein the surface acoustic wave temperature sensor is installed on the surface of the cable at the overhead cable joint through a quick-fixing structure consisting of an arc-shaped fixing member and a mounting pin; The monitoring distribution box has a built-in data acquisition unit, communication unit, energy storage unit, power management module and photovoltaic power generation panel. The monitoring distribution box is equipped with a hanging bracket, which is connected to the clamp with a buckle. An insulating rod fixture includes an insulating rod body and a threaded hole at the top of the insulating rod body. The threaded hole can be alternately connected to a sensor mounting bracket or a distribution box mounting bracket, so as to respectively install the temperature sensor at the overhead cable joint in a live state, and install the monitoring distribution box on the tower supporting the overhead cable. The surface acoustic wave temperature sensor 1 achieves passive temperature acquisition through a reflection delay line structure and transmits the temperature information to the monitoring distribution box using a radio frequency signal in a unique frequency band.

[0009] By adopting the above-mentioned solution, the present invention provides an overhead cable joint live temperature measurement device. Based on the principle of surface acoustic wave (SAW) sensing, it directly measures the temperature of the hot spot at the overhead cable joint using a SAW temperature sensor. This achieves passive data acquisition and radio frequency transmission via a reflection delay line, avoiding the complexity of wiring and external power supply. The use of an insulating rod fixture solves the installation problem of the temperature measurement device during live overhead cable operation, avoiding the power outage risk associated with traditional power outage construction, and improving operational safety and power supply continuity. Through the coordinated operation of the insulating rod fixture, the temperature sensor mounting bracket structure, and the monitoring distribution box mounting bracket structure, rapid installation and online temperature monitoring under live conditions are achieved. The temperature information measured by the sensor is transmitted via a unique frequency band radio frequency signal, enabling the differentiation and management of radio frequency signals, avoiding co-channel interference, and allowing simultaneous management of multiple monitoring points, thus possessing good scalability.

[0010] In some embodiments of the present invention, the arc-shaped fixing member is an elastic clamping structure that automatically retracts and hugs the cable surface after the mounting pin is removed.

[0011] In some embodiments of the present invention, the length of the insulating rod fixture is adjustable, and the threaded hole at the top is adapted to the bolt connection structure on the sensor mounting bracket and the distribution box mounting bracket.

[0012] In some embodiments of the present invention, the temperature sensor is installed at multiple connectors, and the radio frequency signal of the temperature sensor at each connector occupies a unique frequency band as an identification address.

[0013] In some embodiments of the present invention, two directional antennas are installed inside the monitoring distribution box. The two directional antennas are respectively connected to multiple surface acoustic wave temperature sensors and receive radio frequency signals sent by the surface acoustic wave temperature sensors.

[0014] In a second aspect, the present invention provides an installation method for a live temperature measuring device for an overhead cable joint, the method being applied to the aforementioned live temperature measuring device for an overhead cable joint, comprising the following steps: S1: Under energized conditions, use the temperature sensor mounting bracket on the top of the insulating rod fixture to fix the surface acoustic wave temperature sensor. Push the insulating rod to make the arc-shaped fixing part of the sensor fit tightly against the cable surface until the mounting pin falls off, thus completing the installation of the surface acoustic wave temperature sensor. S2: Use the distribution box mounting bracket on the top of the insulating rod fixture to support the monitoring distribution box. Lift the monitoring distribution box to the position of the clamp already installed at the tower. Adjust the position of the monitoring distribution box to make the hanger fit into the clamp. Rotate the insulating rod fixture to separate the distribution box mounting bracket from the monitoring distribution box, thus completing the installation of the monitoring distribution box. S3: The surface acoustic wave temperature sensor collects the temperature of the cable joint and sends it to the monitoring distribution box 2 in the form of radio frequency signal. After demodulating the signal, the monitoring distribution box uploads it to the remote monitoring platform through the wireless communication module.

[0015] In some embodiments of the present invention, in step S1, the mounting pin automatically detaches after the sensor is attached to the cable, and the arc-shaped fixing member retracts and locks onto the cable surface.

[0016] In some embodiments of the present invention, in step S2, the clamp buckle is pre-fixed to the tower by the clamp body and the clamp fastener.

[0017] In some embodiments of the present invention, the monitoring distribution box is self-powered by photovoltaic power generation panels and energy storage units, and triggers local audible and visual alarms and remote alarms when the temperature exceeds a threshold.

[0018] In some embodiments of the present invention, two directional antennas are installed inside the monitoring distribution box. The two directional antennas are respectively connected to surface acoustic wave temperature sensors installed at multiple cable joints and receive radio frequency signals sent by the surface acoustic wave temperature sensors.

[0019] Compared with existing technologies, the advantages of this invention lie in its use of insulated rod fixtures to ensure safe and power-free installation of the sensor on live power lines, fundamentally avoiding the reduced power supply reliability caused by traditional power outage operations and greatly improving operational safety. Furthermore, the passive surface acoustic wave sensor used in this invention requires no external power supply or communication cables, achieving data transmission through radio frequency signals. This solves the problems of difficult wiring and inconvenient power access in the field, significantly improving the deployment flexibility and long-term operational reliability of overhead cable monitoring nodes. Moreover, the independent power supply scheme combining photovoltaic and energy storage ensures that the monitoring equipment can continue to operate stably in field environments without mains power support, effectively reducing maintenance costs.

[0020] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the text, or may be learned by practice of the invention. The objects and other advantages of the invention will become apparent from the description and the accompanying drawings.

[0021] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] In the attached diagram: Figure 1 This is a schematic diagram of the surface acoustic wave temperature sensor installation structure in the overhead cable joint live temperature measuring device in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the installation structure of the distribution box in the overhead cable joint live temperature measuring device in an embodiment of the present invention.

[0025] Figure 3 This is a flowchart illustrating an installation method for a live temperature measuring device for an overhead cable connector, provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the internal structure of the surface acoustic wave temperature sensor in the overhead cable joint live temperature measuring device in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the functional layout of the monitoring distribution box in the overhead cable joint live temperature measuring device in an embodiment of the present invention.

[0028] The annotations in the attached figures are explained as follows: 1. Surface acoustic wave temperature sensor; 2. Monitoring distribution box; 3. Insulating rod fixture; 4. Sensor body; 5. Arc-shaped fastener; 6. Mounting pin; 7. Overhead cable; 8. Sensor mounting bracket; 9. Distribution box mounting bracket; 10. Hanger; 11. Clamp body; 12. Clamp fastener; 13. Clamp buckle; 14. Tower; 15. Distribution box body; 16. Insulating rod body; 17. Threaded hole. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0030] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0031] Figure 1 , 2 This is a schematic diagram of the structure of an overhead cable connector live temperature measuring device provided in an embodiment of the present invention.

[0032] Example 1, as Figure 1 , 2 As shown, the present invention provides a live temperature measuring device for an overhead cable joint, the device comprising: Surface acoustic wave temperature sensor 1, wherein the surface acoustic wave temperature sensor is installed on the surface of the cable at the overhead cable joint through a quick-fixing structure consisting of an arc-shaped fixing member 5 and a mounting pin 6; The monitoring distribution box 2 has a built-in data acquisition unit, communication unit, energy storage unit, power management module and photovoltaic power generation panel. The monitoring distribution box is equipped with a hanging part 10, which is fitted and connected to the clamp buckle 13. The insulating rod fixture 3 includes an insulating rod body 16 and a threaded hole 17 on the top of the insulating rod body 16. The threaded hole 17 can be alternately connected to a sensor mounting bracket 8 or a distribution box mounting bracket 9, so as to respectively install the temperature sensor at the overhead cable joint in a live state, and install the monitoring distribution box on the tower supporting the overhead cable. The surface acoustic wave temperature sensor 1 achieves passive temperature acquisition through a reflection delay line structure and transmits the temperature information to the monitoring distribution box 2 using a radio frequency signal in a unique frequency band.

[0033] The arc-shaped fixing member 5 is an elastic clamping structure that automatically retracts and hugs the cable surface after the mounting pin 6 is removed.

[0034] In some embodiments of the present invention, the length of the insulating rod fixture 3 is adjustable, and the threaded hole 17 at the top is adapted to the bolt connection structure on the sensor mounting bracket 8 and the distribution box mounting bracket 9.

[0035] In some embodiments of the present invention, the temperature sensor is installed at multiple connectors, and the radio frequency signal of the temperature sensor at each connector occupies a unique frequency band as an identification address.

[0036] In some embodiments of the present invention, the monitoring distribution box 2 is provided with two directional antennas, which are respectively connected to multiple surface acoustic wave temperature sensors 1 and receive radio frequency signals sent by the surface acoustic wave temperature sensors.

[0037] By employing the above-described solution, the overhead cable connector live-line temperature measurement device of the present invention achieves safe and uninterrupted installation of the sensor on the live-line by using an insulated rod fixture during the installation and deployment phase. This fundamentally avoids the problem of reduced power supply reliability caused by traditional power outage operations, greatly improving operational safety. Furthermore, the passive surface acoustic wave sensor used eliminates the need for external power supply and communication cables, transmitting data via radio frequency signals. This solves the problems of difficult wiring and inconvenient power access in the field, significantly improving the deployment flexibility and long-term operational reliability of monitoring nodes. Moreover, the system utilizes an independent power supply scheme combining photovoltaic and energy storage, ensuring continuous and stable operation of the monitoring equipment in field environments without mains power support, effectively reducing maintenance costs.

[0038] In terms of signal management and data processing, the system assigns a unique identification frequency band to each sensor node, effectively avoiding co-channel interference between multiple nodes and laying the foundation for large-scale system expansion. The signal demodulation and intelligent analysis module built into the monitoring distribution box can accurately extract temperature information and perform real-time diagnosis based on thresholds, ensuring the accuracy of monitoring results and the timeliness of anomaly identification. Finally, through the collaboration of a remote monitoring platform and local audible and visual alarms, a dual early warning system combining on-site and remote monitoring is constructed to ensure that abnormal situations can be detected and responded to in real time. The entire device has also undergone specialized weather-resistant reinforcement design, enabling it to withstand complex and harsh outdoor environments such as high temperatures, humidity, and lightning strikes for extended periods, thus comprehensively ensuring the efficient, stable, and reliable operation of the entire online monitoring system throughout its entire lifecycle.

[0039] Example 2, as Figure 3 As shown, the present invention provides a method for installing a live temperature measuring device for an overhead cable joint. The method is applied to the aforementioned live temperature measuring device for an overhead cable joint and includes the following steps: S1: In the energized state, use the temperature sensor mounting bracket 8 on the top of the insulating rod tool 3 to fix the surface acoustic wave temperature sensor 1. Push the insulating rod to make the sensor arc-shaped fixing part 5 stick to the cable surface until the mounting pin 6 falls off, thus completing the installation of the surface acoustic wave temperature sensor 1. S2: The monitoring distribution box 2 is supported by the distribution box mounting bracket 9 on the top of the insulating rod tooling 3. The monitoring distribution box 2 is lifted to the position of the clamp buckle 13 already installed at the tower 14. The position of the monitoring distribution box 2 is adjusted so that the hanging part 10 and the clamp buckle 13 are engaged. The insulating rod tooling 3 is rotated to separate the distribution box mounting bracket 9 from the monitoring distribution box 2, thus completing the installation of the monitoring distribution box 2. S3: The surface acoustic wave temperature sensor 1 collects the temperature of the cable joint and sends it to the monitoring distribution box 2 in the form of radio frequency signal. After demodulating the signal, the monitoring distribution box uploads it to the remote monitoring platform through the wireless communication module.

[0040] In some embodiments of the present invention, in step S1, the mounting pin 6 automatically detaches after the sensor is attached to the cable, and the arc-shaped fixing member 5 retracts and locks onto the surface of the cable.

[0041] In some embodiments of the present invention, in step S2, the clamp buckle 13 is pre-fixed to the tower 14 by the clamp body 11 and the clamp fastener 12.

[0042] In some embodiments of the present invention, the monitoring distribution box 2 is self-powered by photovoltaic power generation panels and energy storage units, and triggers local audible and visual alarms and remote alarms when the temperature exceeds a threshold.

[0043] In some embodiments of the present invention, the monitoring distribution box 2 is provided with two directional antennas, which are respectively connected to surface acoustic wave temperature sensors installed at multiple cable joints and receive radio frequency signals sent by the surface acoustic wave temperature sensors.

[0044] Specifically, the device is based on the principle of acoustic sensing and is designed using the principle that the resonant frequency of a surface acoustic wave (SAW) temperature sensor is correlated with the temperature.

[0045] like Figure 1 As shown in Figure 2, the device consists of a surface acoustic wave temperature sensor 1, a monitoring distribution box 2, and an insulating rod fixture 3; wherein the surface acoustic wave temperature sensor 1 is installed near the cable joint at the temperature being measured; the monitoring distribution box 2 is installed on the overhead line fixed tower; the insulating rod fixture 3 unit is responsible for the live installation of the surface acoustic wave temperature sensor 1 and the monitoring distribution box 2.

[0046] The surface acoustic wave temperature sensor 1 and the monitoring distribution box 2 are designed to be compatible with the insulating rod fixture 3. Following a specific work procedure and operating method, the temperature measuring device can be installed under energized conditions. The insulating rod fixture 3 is based on an existing power insulating rod, with a threaded hole 17 at its top. This allows for bolted connection to support and secure the components to be installed. The length of the insulating rod fixture 3 is adjustable.

[0047] exist Figure 1 In the above, the surface acoustic wave temperature sensor 1 consists of three parts: sensor body 4, arc-shaped fixing part 5, and mounting pin 6. The sensor body 4 is the core component for temperature measurement of the surface acoustic wave temperature sensor 1; the arc-shaped fixing part 5 is the fixing component used to fix the surface acoustic wave temperature sensor 1 to the overhead cable; the mounting pin 6 is a component used to temporarily open the arc-shaped fixing part 5 during the installation of the surface acoustic wave temperature sensor 1 with the insulating rod tool 3. The mounting pin 6 will automatically fall off after the surface acoustic wave temperature sensor 1 is installed in place.

[0048] like Figure 4 As shown, the sensor body 4 consists of a surface acoustic wave resonator chip, an antenna, a circuit board assembly, and structural components. The surface acoustic wave resonator chip and the antenna are fixed to the circuit board assembly by a soldering process, and the circuit board assembly is embedded and fixed to the structural components.

[0049] The surface acoustic wave temperature sensor 1 adopts the working principle of resonant surface acoustic wave sensing. It is designed based on the correlation between the resonant frequency and temperature of the surface acoustic wave sensor. It contains a surface acoustic wave resonator chip. The chip uses piezoelectric ceramic material as the chip substrate. Interdigitated electrodes and reflective structures are etched on the surface of the piezoelectric substrate using semiconductor photolithography.

[0050] like Figure 4 As shown, the surface acoustic wave (SAW) resonator chip contains an interdigital transducer, which serves as both an input and output transducer. Reflecting gratings are located on both sides of the interdigital transducer, forming a surface acoustic wave resonant cavity. The interdigital transducer performs sound-to-electric conversion. Its working principle is as follows: an external excitation signal is applied to the input interdigital transducer, which converts the electrical signal into a surface acoustic wave. The surface acoustic wave propagates along the surface of the piezoelectric crystal to both sides, is reflected and superimposed by the reflecting gratings on both sides, and is output through the interdigital transducer. This resonator structure is well-suited for passive wireless temperature detection. In some embodiments of the present invention, the data processing module of the monitoring distribution box includes a demodulation unit and an analysis unit. The data processing module is used to extract temperature information from the radio frequency signal and perform anomaly identification.

[0051] The monitoring distribution box 2 consists of a distribution box body 15, a distribution box mounting bracket 9, and a hanger 10. The distribution box body 15 is equipped with components for temperature acquisition, power supply, communication, and energy storage. The hanger 10 is used to fix the monitoring distribution box 2. The distribution box mounting bracket 9 is used to temporarily fix and support the components of the monitoring distribution box 2 during the installation of the monitoring distribution box 2 through the insulating rod tooling 3.

[0052] The surface acoustic wave temperature sensor 1 receives electromagnetic wave signals emitted by the monitoring distribution box 2 and transmits them to the input terminal of the internal surface acoustic wave resonator chip. The signal is converted, transmitted, and reflected inside the surface acoustic wave resonator chip and radiates from the surface acoustic wave temperature sensor 1 into the surrounding space in the form of electromagnetic echo.

[0053] Furthermore, such as Figure 5 As shown, the monitoring distribution box 2 contains a data acquisition unit, a communication unit, an energy storage unit, a power management system, a photovoltaic power generation panel, and an antenna assembly. Its specific functions, layout, and operating process are as follows: 1) The photovoltaic power generation panel adopts a flexible photovoltaic panel structure and is fixed on the outer shell of the distribution box 15. It is responsible for generating electricity when there is sunlight. The electricity is managed and controlled by the power management system and output to the energy storage unit for storage. 2) Antennas 01 and 02 are high-frequency signal transmission units responsible for transmitting and receiving electromagnetic signals. The antennas adopt a directional flat panel structure and are integrated with the power distribution box 15. Antennas 01 and 02 are each responsible for aligning with the three surface acoustic wave temperature sensors 1 located near them and communicating with the surface acoustic wave temperature sensors 1. 3) The data acquisition unit is the core component of the device. It is powered by an energy storage unit and connected to an antenna and a communication unit. The data acquisition unit contains a central processing unit, a controller and an RF transceiver circuit. The data acquisition unit can automatically transmit electromagnetic wave signals through embedded software control. The signals are radiated into the surrounding space through the external antenna 01 and antenna 02 units. At the same time, it receives the echo signal from the surface acoustic wave temperature sensor 1, analyzes it and calculates the temperature. 4) The communication unit is the channel for data transmission of the device. The communication unit can receive scheduling instructions from remote users wirelessly (5G / 4G or other forms) and transmit the instructions to the data collector; the communication unit can also receive temperature data transmitted by the data collector and transmit it to remote users wirelessly.

[0054] The installation method and process of the device are further described below: 1) When installing surface acoustic wave temperature sensor 1, according to Figure 1As illustrated, the first step is to thread the sensor mounting bracket 8 and the insulating rod fixture 3 together. The second step is to place the surface acoustic wave temperature sensor 1, which is to be installed, upside down on the sensor mounting bracket 8. The cavity structure of the sensor mounting bracket 8 can accommodate the sensor body 4 component of the surface acoustic wave temperature sensor 1, ensuring that the surface acoustic wave temperature sensor 1 will not fall off. The third step is to raise the insulating rod fixture 3 and bring the top surface acoustic wave temperature sensor 1 close to the overhead cable 7 component to be installed. The fourth step is to push the insulating rod fixture 3 with a little force when the arc-shaped fixing part 5 of the surface acoustic wave temperature sensor 1 is in contact with the overhead cable 7 component. When the mounting pin 6 falls off, the surface acoustic wave temperature sensor 1 is installed in place. 2) When monitoring distribution box 2 is installed, according to Figure 2 As illustrated, the installation process is as follows: First, place the clamp body 11 with buckle 13 onto the tower 14 and secure the clamp body 11 and tower 14 by tightening the clamp fastener 12. Second, connect the bolts on the distribution box mounting bracket 9 at the bottom of the monitoring distribution box 2 to the threaded hole 17 at the top of the insulating rod fixture 3. Third, raise the insulating rod fixture 3 and bring the top of the monitoring distribution box 2 close to the clamp buckle 13 already installed on the tower 14. Fourth, when the hanging part 10 on the monitoring distribution box 2 is close to the clamp buckle 13, adjust the position of the insulating rod fixture 3 to make the hanging part 10 and the clamp buckle 13 fit together. Fifth, rotate the insulating rod fixture 3 counterclockwise to loosen the connection between the threaded hole 17 at the top of the insulating rod fixture 3 and the bolt on the distribution box mounting bracket 9, and lower the insulating rod fixture 3 to complete the installation of the monitoring distribution box 2.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Improved safety of live installation: The temperature sensor is installed live at the overhead cable joint by using an insulating rod tool, which avoids the risk of power outage caused by traditional power outage construction and improves the safety of operation and the continuity of power supply.

[0056] (2) The sensor operates passively and has high reliability: It adopts a surface acoustic wave temperature sensor and realizes passive acquisition and radio frequency transmission through reflection delay line, avoiding the complexity of wiring and external power supply, and enabling the sensor to have long-term maintenance-free characteristics.

[0057] (3) Photovoltaic + energy storage power supply, independent operation: The monitoring distribution box achieves independent power supply through photovoltaic modules and energy storage batteries, ensuring the continuous and stable operation of the system in the field environment and significantly reducing maintenance costs.

[0058] (4) Unique frequency band mechanism to avoid signal interference: Each sensor node is distinguished and managed through a unique frequency band, avoiding co-frequency interference, and can manage multiple monitoring points at the same time, with good scalability.

[0059] (5) Data demodulation and intelligent processing: The built-in data processing module of the monitoring distribution box can demodulate the radio frequency signal and extract temperature information, and combine it with threshold judgment to realize anomaly identification, ensuring the accuracy and timeliness of monitoring.

[0060] (6) Combination of remote monitoring and local alarm: Temperature information can be uploaded to the remote monitoring platform in real time through the wireless communication module. At the same time, the monitoring distribution box has local display and sound and light alarm functions, realizing dual protection on site and remote.

[0061] (7) Weather-resistant design: The whole device adopts weather-resistant materials and structural design, which can adapt to complex environments such as high temperature, humidity and lightning for a long time, ensuring the stability and life of the monitoring system.

[0062] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A live temperature measuring device for an overhead cable connector, characterized in that, The device includes: The surface acoustic wave temperature sensor (1) is installed on the surface of the cable at the overhead cable joint through a quick-fixing structure consisting of an arc-shaped fixing member (5) and a mounting pin (6). The monitoring distribution box (2) is equipped with a built-in data acquisition unit, communication unit, energy storage unit, power management module and photovoltaic power generation panel. The monitoring distribution box is provided with a hanging part (10), which is fitted and connected with a clamp buckle (13). The insulating rod fixture (3) includes an insulating rod body (16) and a threaded hole (17) on the top of the insulating rod body (16). The threaded hole (17) can be alternately connected to a sensor mounting bracket (8) or a distribution box mounting bracket (9) to respectively install the temperature sensor at the overhead cable joint in a live state and install the monitoring distribution box on the tower supporting the overhead cable. The surface acoustic wave temperature sensor (1) achieves passive temperature acquisition through a reflection delay line structure and transmits the temperature information to the monitoring distribution box (2) using a radio frequency signal in a unique frequency band.

2. The overhead cable joint live temperature measuring device according to claim 1, characterized in that, The arc-shaped fixing member (5) is an elastic clamping structure that automatically retracts and hugs the cable surface after the mounting pin (6) is removed.

3. The overhead cable joint live temperature measuring device according to claim 1, characterized in that, The length of the insulating rod fixture (3) is adjustable, and the threaded hole (17) at the top is adapted to the bolt connection structure on the sensor mounting bracket (8) and the distribution box mounting bracket (9).

4. The overhead cable joint live temperature measuring device according to claim 1, characterized in that, The temperature sensor is installed at multiple connectors, and the radio frequency signal of the temperature sensor at each connector occupies a unique frequency band as an identification address.

5. The overhead cable joint live temperature measuring device according to claim 1, characterized in that, The monitoring distribution box (2) is equipped with two directional antennas. The two directional antennas are respectively connected to multiple surface acoustic wave temperature sensors (1) and receive radio frequency signals sent by the surface acoustic wave temperature sensors.

6. A method for installing a live temperature measuring device on an overhead cable joint, characterized in that, The overhead cable joint live temperature measuring device according to any one of claims 1-5 includes the following steps: S1: In the energized state, use the temperature sensor mounting bracket (8) on the top of the insulating rod tool (3) to fix the surface acoustic wave temperature sensor (1). Push the insulating rod to make the sensor arc-shaped fixing part (5) stick to the cable surface until the mounting pin (6) falls off, and the installation of the surface acoustic wave temperature sensor (1) is completed. S2: Use the distribution box mounting bracket (9) on the top of the insulating rod tool (3) to support the monitoring distribution box (2), lift the monitoring distribution box (2) to the position of the clamp buckle (13) already installed at the tower (14), adjust the position of the monitoring distribution box (2) so that the hanging part (10) fits into the clamp buckle (13), rotate the insulating rod tool (3) to separate the distribution box mounting bracket (9) from the monitoring distribution box (2), and complete the installation of the monitoring distribution box (2); S3: The surface acoustic wave temperature sensor (1) collects the temperature of the cable joint and sends it to the monitoring distribution box (2) in the form of radio frequency signal. After demodulating the signal, the monitoring distribution box uploads it to the remote monitoring platform through the wireless communication module.

7. The installation method of the live temperature measuring device for overhead cable joints according to claim 6, characterized in that, In step S1, the mounting pin (6) automatically detaches after the sensor is attached to the cable, and the arc-shaped fixing piece (5) retracts and locks onto the cable surface.

8. The installation method of the live temperature measuring device for overhead cable joints according to claim 6, characterized in that, In step S2, the clamp buckle (13) is pre-fixed to the tower (14) by the clamp body (11) and the clamp fastener (12).

9. The installation method of the live temperature measuring device for overhead cable joints according to claim 6, characterized in that, The monitoring distribution box (2) is self-powered by photovoltaic power generation panels and energy storage units, and triggers local audible and visual alarms and remote alarms when the temperature exceeds the threshold.

10. The installation method of the live temperature measuring device for overhead cable joints according to claim 6, characterized in that, The monitoring distribution box (2) is equipped with two directional antennas. The two directional antennas are respectively connected to the surface acoustic wave temperature sensor (1) installed at multiple cable joints and receive the radio frequency signal sent by the surface acoustic wave temperature sensor.

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