基于避雷器尾端电流监测的过电压反演可行性研究

Research on the Feasibility of Overvoltage Inversion by Monitoring Lightning Arrester Tail-End Current

目前已有许多在线监测装置能够成功获取到避雷器过电压的电流、电压信号,也可对过电压作用时刻进行记录,但尚未开展对避雷器冲击电流幅值及波形的记录研究,错过了通过避雷器冲击电流这一信息量丰富的状态量开展数据挖掘的尝试。采用现场试验的方式,对雷电过电压作用下避雷器尾端电流进行了实测,通过建立避雷器有限元场分析模型提取分布参数,使用电磁暂态仿真软件ATP-EMTP建立过电压分析模型,仿真得到避雷器尾端冲击电流结果,将实测数据和仿真数据进行对比,验证了基于避雷器尾端电流监测反演避雷器首端过电压幅值和波形的可行性,并提出利用快速傅里叶变换方法,通过尾端电流反演出首端电压,为开展过电压幅值及类别的智能识别提供了技术支撑。

Many online monitoring devices could obtain the signals of current and voltage when the overvoltage of lightning arrester occurs.In addition,those devices could record the moment when the overvoltage operates.However,there is barely any research on recording the amplitude and waveform of the inrush current of the arrester,which means researchers might miss the opportunities of data mining of the inrush current.This paper monitored the current of the arrester tail-end under the action of the lightning overvoltage in the field test.Moreover,it collected the distributed parameter by establishing the analytic model of the arrester and used the ATP-EMTP software to construct the analytic model of overvoltage.This study got the results of the inrush current of the arrester tail-end from the simulation.It compared the testing data with the simulation data,and it verifyed the feasibility of overvoltage inversion by monitoring lightning arrester tail-end current.Moreover,it proposed the fast Fourier transform method and employed tail-end current to invert the head-end voltage.Providing technical support for the intelligent identification of overvoltage amplitude and overvoltage type.