Cable deformation monitoring and early warning device and method

Abstract

The invention discloses a cable deformation monitoring and early warning device and method, and belongs to the field of cable deformation monitoring and early warning. In order to solve the problems of cable insulation layer damage, conductor breakage and the like caused by condensation and icing in winter, displacement of an electric tower and the like, the invention provides a cable deformation monitoring and early warning device and method, and the device consists of a master station and N slave stations. The master station and the slave stations communicate through an ad hoc network, and the master station is responsible for receiving early warning signals from all the slave stations. The slave stations are installed at monitoring points of a cable network according to the serial number sequence, when the cable is subjected to external force, the length of the cable changes, the change is transmitted to the slave station shell through tension and then transmitted to the elastic conductor, the resistance value of the elastic conductor changes, and the slave stations indirectly monitor the cable by monitoring the change. And when the change exceeds a set range, the slave station sends an early warning signal with a self number to the master station, so that monitoring and early warning of the cable are realized.

Description

Technical Field

[0001] The present invention relates to the field of cable monitoring and early warning, and in particular to cable deformation monitoring and early warning. Background Art

[0002] Cables are the "arteries" and "nerves" of modern society. Sometimes they are damaged by external factors, such as condensation and icing in winter, displacement of electric towers, etc., which can cause insulation damage and conductor breakage, which will cause regional power outages and affect normal production and life. Various enterprises and units have conducted a variety of research on the protection and monitoring of cables.

[0003] [Patent No.: CN118198931A] Luo Yizhao et al. disclosed an invention patent titled "A Cable Running Status Inspection Robot". The invented robot runs along the guide rail, detects cable skin damage through the monitoring component, and drives the repair component to repair the damaged skin. However, its use is too limited, requiring additional running tracks to be laid and unable to predict impending damage.

[0004] The paper by Fred Steennis et al., titled "Guarding MV cables on-line: With travellingwave based temperature monitoring, fault location, PD location and PD related remaining life aspects", detects and quickly locates medium voltage cable faults through partial discharge, and improves its accuracy to within 1% of the cable length. However, this monitoring method may not be able to issue early warnings in time when facing PILC cables due to their self-healing ability.

[0005] [Patent No.: CN117970031A] Shen Dilong et al. disclosed a patent titled "A cable monitoring and early warning system and method based on stress waves". The pulse signal transmitting module sends a pulse signal to the cable and receives it through the receiving module, and the pulse transmission time is calculated to determine whether the cable is qualified. However, due to the limitations of its equipment, this method can only monitor the cable product in the factory, and it is difficult to monitor and warn the operating cable network.

[0006] Anqiang Lv et al., in their paper titled "On-line monitoring system of 35kV 3-core submarine power cable based on φ-OTDR", proposed a method for detecting anchor damage of submarine power cables based on φ-OTDR, simulating anchoring and anchoring events. The vibration data of calm sea, anchoring and anchoring resistance were obtained and analyzed, but this solution is still immature and needs further research.

[0007] [Patent No.: CN118040533A] Huang Yingmin et al. disclosed an invention patent titled "An overhead cable protection device and method" that combines a vibration monitoring module, a camera, and a drone to achieve a three-in-one cable protection device that collects vibration, collects image data, and drives away drones. However, the proposed system may require a more advanced AI system or human labor for continuous monitoring.

[0008] Tang Xianghua and others designed a wireless intelligent vibration collection system to address the problem of underground cables being damaged by excavation, which affects the operation of the cable system. The paper titled "Design of Buried Cable Anti-External Damage Monitoring and Early Warning System Based on Wireless Intelligent Vibration Sensor" aims to provide early warning of underground cable excavation damage by analyzing and extracting features from the collected vibration signals. However, due to the small propagation radius and fast attenuation of vibrations generated by excavation in the underground, feature extraction and identification are difficult.

[0009] It can be seen from the above content that the existing inventions focus on locating the location where damage has occurred, and it is difficult to give early warning for damage that has not occurred. Summary of the invention

[0010] In view of the above problems, the present invention discloses a cable deformation monitoring and early warning device and method, which belongs to the field of cable deformation monitoring and early warning. In view of the problems of cable insulation damage and conductor breakage caused by condensation and icing in winter and displacement of electric towers, a cable deformation monitoring and early warning device and method are proposed, which are composed of a master station and N slave stations. The master station and the slave station communicate through an ad hoc network, and the master station is responsible for receiving early warning signals from each slave station. The slave stations are installed at various monitoring points of the cable network according to the sequence of numbers. When the cable is subjected to external force, the cable length changes. This change is transmitted to the slave station housing through tension and then to the elastic conductor, which will cause the resistance of the elastic conductor to change. The slave station monitors the cable indirectly by monitoring the change in the resistance of the elastic conductor. When this change exceeds the set range, the slave station sends an early warning signal with its own number to the master station. While taking into account lightweight and small size, solar power is used to achieve long-term uninterrupted monitoring and early warning.

[0011] The technical solution is:

[0012] A cable deformation monitoring and early warning device and method, including a master station and N slave stations. The master station is responsible for receiving the early warning signal sent by the slave station and confirming the position coordinates of the slave station according to the number. The slave station is responsible for monitoring the cable deformation. If the cable deformation exceeds the threshold, it sends an early warning message with its own number to the master station to achieve the early warning effect.

[0013] The master station is the communication master station, which receives warning information sent from each slave station through the self-organizing network.

[0014] The slave station includes a casing, an elastic conductor, a main control board, a wireless communication module, an antenna, a battery and a photovoltaic panel.

[0015] The housing is made of flexible material and should satisfy Formula 1 to ensure full monitoring of the cable deformation range.

[0016] E W <E D (1)

[0017] Where E W is the elastic modulus of the shell material; E D is the elastic modulus of the cable itself.

[0018] The working principle of the elastic conductor satisfies Formula 2. When the elastic conductor is deformed along with the outer shell, its length and cross-sectional area change, causing its resistance value to change accordingly. The deformation of the cable can be monitored by measuring the resistance value through the circuit.

[0019] (2)

[0020] in is the change in resistance of the elastic conductor; is the initial value of the elastic conductor resistance; is the change in length of the elastic conductor; is the initial value of the elastic conductor length; is the sensitivity coefficient;

[0021] The elastic conductor and the shell are positioned by positioning pins and connected by adhesive to ensure that the deformation of the shell is accurately reflected on the elastic conductor.

[0022] The main control board is responsible for monitoring the change of the resistance value of the elastic conductor. When the resistance value of the elastic conductor is abnormal, it commands the wireless communication module to send a signal with its own number and the abnormal resistance value to the master station at a certain interval. However, since the conductor resistance is greatly affected by temperature, the slave station works in an outdoor environment with a large temperature difference. The temperature sensor is integrated on the main control board to improve the accuracy of the slave station warning by collecting the temperature variable.

[0023] The wireless communication module realizes communication through self-organizing network, and builds tree network topology, star network topology and mesh network topology to adapt to different transmission environments.

[0024] Use batteries to power the site and cooperate with photovoltaic panels to complete outdoor energy supply, ensuring long-term and stable operation of the slave station.

[0025] The working process of the cable deformation monitoring and early warning device and method is as follows:

[0026] Cable deformation monitoring and early warning device and method Before working: Arrange the wireless communication modules of the master station and slave station to form an ad hoc network according to the installation environment. Debug the operation status of the elastic conductor to ensure its normal operation. Set different abnormal ranges according to the actual cable material size and other conditions. Install each slave station to the corresponding monitoring point according to the number information.

[0027] When the cable deformation monitoring and early warning device and method are working: when encountering external force, the cable is elastically deformed by force, causing the length of the cable in the monitoring section to change. The tension generated by the cable deformation will be transmitted to the elastic conductor through the outer shell, thereby affecting the deformation of the elastic conductor, which causes the resistance of the elastic conductor in the circuit to change. The main control board monitors the cable by monitoring the resistance of the elastic conductor. When the resistance of the elastic conductor exceeds the set range, the wireless communication module sends an early warning signal to the master station. Since the slave station works in an outdoor environment with a large temperature difference in the environment, a temperature sensor is integrated on the main control board to improve the accuracy of the slave station early warning by collecting the temperature variable.

[0028] Compared with the prior art, the present invention has significant improvements in that:

[0029] (1) Novelty: For the first time, it is proposed to monitor cable deformation through real-time changes in elastic conductors and send out early warning signals through wireless communication modules.

[0030] (2) Early warning: The present invention monitors the cable deformation in real time and provides early warning before the cable is damaged by external forces but before irreversible damage occurs, thereby greatly reducing the losses caused by such damage.

[0031] (3) Economical: The present invention utilizes the strain effect to monitor cables, issues early warning information through a wireless communication module, and uses photovoltaic panels for power supply. Compared with the existing technology (dispatching technicians to conduct regular inspections, locating the fault after irreversible damage occurs, etc.), it greatly saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the slave station structure of a cable deformation monitoring and early warning device and method of the present invention.

[0033] Figure 2This is a working principle diagram of a cable deformation monitoring and early warning device and method of the present invention.

[0034] Markings in the figure: 1-antenna; 2-photovoltaic panel; 3-wireless communication module; 4-battery; 5-main control board; 6-housing; 7-elastic conductor; L 0 - Normal monitoring section cable length; L 1 Monitor the cable length when it is damaged by external forces; Specific implementation plan

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, preferred embodiments are given below and the specific implementation of the present invention is further described in detail in conjunction with the accompanying drawings.

[0036] Example:

[0037] Combined with Figure 1 and Figure 2

[0038] Before the cable deformation monitoring and early warning device and method work: arrange the wireless communication modules 3 of the master station and the slave station to form a corresponding self-organizing network according to different installation environments. Debug the operation status of the elastic conductor 7 to ensure its normal operation. Set different parameters according to the actual cable material, size, etc. Install each slave station to the corresponding monitoring point according to the number information.

[0039] When the cable deformation monitoring and early warning device and method are working: Under normal circumstances, the length of the monitoring section cable is L 0 When encountering external force, the cable undergoes elastic deformation, causing the length of the monitoring section cable to become L 1 The tension generated by the cable deformation will be transmitted to the elastic conductor 7 through the housing 6, thereby affecting the deformation of the elastic conductor 7, which causes the resistance of the elastic conductor 7 in the circuit to change. The main control board 5 monitors the cable by monitoring the resistance of the elastic conductor 7. When the resistance of the elastic conductor 7 exceeds the set range, the wireless communication module 3 sends an early warning signal to the master station. Since the slave station works in an outdoor environment with a large temperature difference, a temperature sensor is integrated on the main control board to improve the accuracy of the slave station early warning by collecting the temperature variable.

[0040] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A cable deformation monitoring and early warning device and method, including a master station and N slave stations, the master station is a communication master station, which receives early warning signals sent by the slave stations through a self-organizing network and confirms the position coordinates of the slave stations according to the numbers. The slave stations are installed at various monitoring points of the cable network according to the numbering sequence. When the cable is subjected to external force, the cable length changes. This change is transmitted to the slave station housing through tension and then to the elastic conductor, which will cause the resistance of the elastic conductor to change. The slave station indirectly monitors the cable by monitoring the change in the resistance of the elastic conductor. When this change exceeds the set range, the slave station sends an early warning signal with its own number to the master station. The slave station includes a housing, an elastic conductor, a main control board, a wireless communication module, an antenna, a battery and a photovoltaic panel.

2. A cable deformation monitoring and early warning device and method according to claim 1, characterized in that: The housing is made of flexible material and should satisfy formula (1) to ensure full monitoring of the cable deformation range. AND W <And D (1) Where E W is the elastic modulus of the shell material; E D is the elastic modulus of the cable itself.

3. A cable deformation monitoring and early warning device and method according to claim 1, characterized in that: The elastic conductor should satisfy formula (2). When the elastic conductor is deformed along with the shell, its length and cross-sectional area change, causing its resistance value to change accordingly. The resistance value of the elastic conductor is measured by the circuit to monitor the deformation of the cable. The elastic conductor is positioned by a positioning pin and connected to the shell by an adhesive to ensure that the deformation of the shell is accurately reflected on the elastic conductor. (2) in is the change in resistance of the elastic conductor; is the initial value of the resistance of the elastic conductor; is the change in length of the elastic conductor; is the initial value of the elastic conductor length; is the sensitivity coefficient.

4. A cable deformation monitoring and early warning device and method according to claim 1, characterized in that: The main control board is responsible for monitoring the resistance changes of the elastic conductor. When the resistance value of the elastic conductor is abnormal, it commands the wireless communication module to send an early warning signal carrying its own number and the abnormal resistance value to the master station once at a certain interval. Since the slave station works in an outdoor environment with a large temperature difference, a temperature sensor is integrated on the main control board to improve the accuracy of the slave station's early warning by collecting the temperature variable.

5. A cable deformation monitoring and early warning device and method according to claim 1, characterized in that: The wireless communication module realizes communication through self-organizing network, and builds tree network topology, star network topology and mesh network topology to adapt to different transmission environments.

6. A cable deformation monitoring and early warning device and method according to claim 1, characterized in that: Use batteries to power the site and cooperate with photovoltaic panels to complete outdoor energy supply, ensuring long-term and stable operation of the slave station.

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