开关柜局部放电故障定位研究

Study on Location of Partial Discharge Faults of Switchgears

开关柜在配电网实际运行中会受到多种外界因素的干扰而出现局部放电的现象,不利于配电网系统的安全、稳定运行。基于此,研究了超声技术在高压开关柜局部放电故障定位中的应用,提出了基于TOF与TDOA的三维故障定位算法,通过计算基站接收超声信号的时间差来确定声源的坐标数据,之后引入TAC算法构建故障点超声可视模型,并通过多通道拟合,得到真实的声源3D方向图和近声场超声图像,精准定位局部放电的位置,从而提出开关柜局部放电故障检测方法,为电力系统的安全运行提供有力保障。

During practical operation of the distribution networks,switchgears may be subject to interference from various external factors resulting in partial discharge,which is not conducive to safe and stable operation of distribution networks.In view of this,this article explores the application of ultrasonic technology to locating partial discharge fault of high-voltage switchgears and proposes a three-dimensional fault location algorithm based on TOF and TDOA.The coordinate data of the sound source is determined by calculating time difference between ultrasonic signals received by the base station.After that,the TAC algorithm is introduced to build an ultrasonic visual model of the fault point,and by achieving multi-channel fitting,real 3D directional patterns of the sound source and near-field ultrasonic images are obtained and thuspartial discharge is accurately located.The present work innovates in detection method of partial discharge faultsfor switchgear,and facilitates safe operation of power system.