| The high-voltage transmission line monitoring system can feedback problems timely on the transmission line,and nip the operating failures on the transmission line in the bud.However,the monitoring system is extremely susceptible to the impact of the weather environment buy the way of solar and wind energy batteries to supply power,which cannot provide stable power to the monitoring equipment.At present,magnetic resonance wireless power transmission technology(MCR-WPT)has the advantages of high power transmission efficiency and is less affected by changes in weather and environment over medium transmission distances,and is widely used in various fields.Aiming at the problem of power supply of monitoring equipment of 35 kV transmission lines,this paper applies MCR-WPT technology to insulator equipment,constructs a wireless power supply system based on insulators.The system mainly includes high-voltage induction power take-off devices,insulators with wireless power transfer capabilities,and monitoring loads.Firstly,the structures of different insulators were compared and analyzed,and the FXBW4-35/70 composite insulator was determined as the research object of the article,then the matching network and power transfer coil were designed,and the structure design of the insulator with wireless power transfer capability was completed.Secondly,based on circuit theory,the power transfer efficiency of MCR-WPT systems with and without relay coils is compared.The current calculation formula of each coil is deduced,and the optimal load value of MCR-WPT system with relay coil is analyzed.The heat transfer and electromagnetic field theory are discussed.Then,by establishing a simulation model,the magnetic field distribution and power transfer efficiency of the insulator with wireless power transfer capability are calculated,and the power transmission characteristics under different load conditions are discussed,It is shown that under the optimal load resistance,the currents transmitted on each energy transfer is basically equal,and the transmission efficiency is about 57%;Under the same calculation conditions,the temperature distributions of traditional insulators and insulators with wireless power transmission capability were compared and studied.The temperature distribution of insulators with wireless power transfer capability was discussed by selecting different loads and two atmospheric conditions(summer and winter).The calculated data show that under the optimal load condition,the surface temperature distribution of the insulator tends to be uniform,after operating under two atmospheric conditions for about 3 hours,the surface temperature of the insulator increased by 43.8°C and 59°C.The article further research the electrical characteristics of the insulator with wireless power transfer capacity,and obtains the surface field strength distribution diagram,which shows,indicating that the electrical insulation property of the insulator remain basically unchanged after the coil is embedded.Finally,a test platform was set up in a laboratory environment,and the electrical transmission characteristics and temperature experimental verification of insulators with wireless power transfer capabilities were carried out.The results show that the load may obtain 17.2W electric power under the input power of 30.9W,and the test platform runs continuously for 10 minutes,the surface temperature has increased by about 14°C,which can provide stable and continuous power supply for most monitoring equipment. |
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