| Underground power cables are spread all over the city,so real-time monitoring of cable safety information is critical to the entire power system.However,traditional power cables are still built with the built-in,easily damaged equipment such as fiber.Once the equipment fails,the entire cable should be replaced,which brings great pressure on power maintenance.The wireless monitoring device does not need to be designed separately according to the cable,and the later maintenance is simple and convenient,which brings convenience to the power cable monitoring.However,there are still a series of problems in the power supply of wireless monitoring devices in special environments.In order to solve the power supply problems in the underground power cable online monitoring system,this paper designs a self-powered energy source that uses the magnetic field around the underground power cable to gain the energy.The device can realize real-time power supply or phased power supply of the monitoring terminal by using the design,and has a simple structure and convenient maintenance at a later stage.In this paper,based on the energy-collecting device based on the principle of magnetic field energy collection,theoretical,simulation analysis and necessary experimental investigation and verification are carried out for each module that constitutes the device,so as to optimize the design of the energy-receiving device and obtain a self-power supply applied to the periphery of the power cable.Program.Firstly,the paper summarizes and analyzes the wireless sensor and the traditional energy-receiving methods,and puts forward the practical value and superiority of the magnetic field energy-taking method for the special environment such as the power cable.Based on this,the author introduces the conception process of the energy-taking system.The magnetic field principle of the coil can be deduced,the common power cable classification and its structure are introduced,and the soft magnetic material is introduced in detail,and the manganese-zinc ferrite is selected as the magnetic core material applied to the magnetic field around the power cable.Finally,using the laboratory high-current generator and 35kV single-core XLPE insulated power cable to build an experimental platform,the entire energy-taking system was explored,and the experimental and simulated output voltage waveforms of the energy-carrying coil were compared.The distance characteristics of the coil and the relationship between the effective value of the output voltage and the current carrying capacity of the cable.The stability of the voltage at the output of the energy-carrying device is analyzed.The relationship between the voltage at the output terminal and the current-carrying current is obtained,and the load capacity of the whole system is tested..The whole energy-receiving scheme is designed to be small in size and light in weight,and can be applied to power cables of different voltage levels,and can still achieve energy acquisition under the condition of low current carrying capacity of the power cable,and output stable +5V,+3.3V voltage.The power supply problem of the underground power cable wireless monitoring device is solved well. |
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