基于TR技术的开关柜局部放电超声波定位方法

Ultrasonic Location Method of Partial Discharge in Switchgear Based on TR Technology

针对到达时间差(TDOA)定位算法对时延误差很敏感,细小的时延误差可能造成定位失败的问题,提出了采用TR技术的开关柜局部放电超声波定位方法,该方法可忽略波形模态的影响,无需直接进行时延估计。利用实验室制作的针-板放电模型在开关柜内进行试验,验证了方法的可行性,分析了不同信噪比和传感器数量对定位精度的影响,并与TDOA定位法中常用的粒子群算法和牛顿迭代法的定位结果进行了对比,发现TR法定位精度更高。最后通过现场实测验证了TR法的实用性。

Aiming at the TDOA positioning algorithm’s sensitivity to delay errors,small delay errors may cause positioning failure.A TR-based partial discharge ultrasonic positioning method for switchgear was proposed.This method can ignore the influence of waveform modal without delay estimate.Experiments were carried out in the switchgear using the needle-board discharge model made in the laboratory,and the feasibility of the method was verified.The influence of different signal-to-noise ratios and the number of sensors on the positioning accuracy was analyzed.It was compared with particle swarm algorithm and Newton iteration method used in TDOA positioning method,and it is found that the TR method has higher positioning accuracy.Finally,the practicality of the TR method was verified by field measurement.