盘型悬式瓷绝缘子串电路模型及电力传输特性仿真研究

Circuit Model of Suspensive Disc⁃type Porcelain Insulator String and Simulation Study on Its Power Transmission Characteristics

为了给输电线路低压侧杆塔上的在线监测设备供电,提出了一种新型沿盘型悬式瓷绝缘子串进行电力传输的方法,以盘型悬式瓷绝缘子串作为能量传输的载体,将输电线路上在线取能装置获得的电能通过高频变换的方式传递杆塔一侧。文中以500 kV线路为例建立输电线路三维仿真模型,通过Maxwell矩阵计算得出绝缘子与输电线路之间的杂散电容。再通过Multisim软件搭建绝缘子串分布参数电路模型,研究电路模型的电力传输特性,分析了劣化绝缘子与杂散电容对绝缘子串能量传输特性的影响。仿真结果表明,在频率为38 MHz电能可以通过绝缘子串传递到另一侧,能量传输效率为74.576%,且绝缘子劣化与外界环境变化对于其传输特性影响可以忽略。由此可见,利用盘型悬式瓷绝缘子串作为能量传输载体为杆塔在线监测设备供电具有可行性。

To supply power to the online monitoring device on the tower on low⁃voltage side of a transmission line,a new method of power transmission along the suspensive disc⁃type porcelain insulator string is proposed.In this meth⁃od the suspensive disc⁃type porcelain insulator string is used as the carrier of energy transmission to transmit the elec⁃tric energy obtained by the on⁃line energy⁃acquiring device to the tower side by means of high⁃frequency transforma⁃tion.A 500 kV transmission line is taken as an example to establish a three⁃dimensional simulation model,and the stray capacitance between the insulator and the transmission line is calculated via Maxwell matrix.Then,the Multi⁃sim software is used to build a circuit model of the insulator string distribution parameter for investigating the power transmission characteristics of the circuit model.The influences of deteriorated insulator and stray capacitance on the energy transmission characteristics of the insulator string are analyzed.Simulation results show that when the fre⁃quency is 38 MHz,the electric energy can be transmitted to the other side through the insulator string with the energy transmission efficiency 74.576%,and the influences of insulator degradation and external environment change on the transmission characteristics can be neglected.This study indicates that it is feasible to use the suspensive disc⁃type porcelain insulator string as energy transmission carrier for supplying power to the online monitoring device on tower.