轻型输电线缆感应取电装置参数优化设计

Parameter Optimization Design of Light induction Power-taking Device for Transmission Cable

电流互感器(current transformer,CT)感应取电因其具有实用性强、使用范围广与安全性高等优点,将有望成为电力系统输电线缆在线监测设备最有效的供能方式。目前感应取电装置为解决低电流取能不足及大电流易饱和等问题,常采用增大磁芯体积及重量的方法,该方式增加了输电线缆的承重负担,使线缆连接处拉伸应力增大,长期运行将会危及电力系统安全。因此,以降低磁芯重量为前提,采用粒子群算法对磁芯尺寸、气隙大小及线圈匝数等参数进行全局优化。仿真和实验结果表明,在极大降低磁芯重量的基础上(仅为1.2 kg),感应取电装置在一次侧较低电流为15 A时,输出可达0.22 W,功率密度达1414.8 W/m^(-3),且可以保证输电线缆在15~1200 A的电流变化范围内能量的有效输出,具有一定的工程应用价值。

Current transformer induction power generation has the advantages of strong practicability,wide range of use and high safety,and it is expected to become the most effective energy supply method for online monitoring equipment of power system transmission cables.In order to solve the problems of insufficient low current energy extraction and high current saturation,the current induction power extraction device often adopts the method of increasing the volume and weight of the magnetic core.This method increases the load-bearing burden of the transmission cable and stretches the cable connection.Increased stress and long-term operation will endanger the safety of the power system.Therefore,based on the premise of reducing the weight of the magnetic core,this paper adopts the particle swarm algorithm to globally optimize the magnetic core size,air gap size and the number of turns of the coil.The simulation and experimental results show that,on the basis of greatly reducing the weight of the magnetic core(only 1.2 kg),the output of the induction power device can reach 0.22 W when the primary current is 15 A,and the transmission line can be guaranteed to be 15 A.The effective output of energy within the current range of 15~1,200 A has certain application value.