基于改进公垂线法的变压器局放超声定位研究

Research on Partial Discharge Ultrasonic Location in Transformer Based on Improved Common Perpendicular Line

方向角和俯仰角确定后,定位误差与传感器到变压器内部局放源之间的距离成正相关性。提出了一种改进的测向公垂线中点法,该方法通过模拟实验求得各传感器感应到的超声信号情况随局放源与传感器之间距离的变化曲线,测得传感器感应到的超声幅值,从而推算局放源与传感器之间的空间距离,并认为局放源在测向线公垂线上,而且局放源距测向线的距离与局放源到传感器之间的距离成正比。模拟变压器局放实验证实了该方法可以在测向线公垂线中点法的基础上进一步提高定位精度。

After the direction angle and the pitch angle are determined,the positioning error is positively correlated with the distance between the sensor and the partial discharge(PD)source.This paper proposed a kind of improved direction-finding common perpendicular midpoint method,obtaining the curve of the ultrasonic signal induced by each sensor changing with the distance between the PD source and the sensor by simulation experiment and measuring the sensor ultrasonic amplitude,so as to calculate the spatial distance between the PD source and the sensor.It is considered that the PD source is on the direction-finding common perpendicular line and the distance between the PD source and the direction-finding line is proportional to the distance between the PD source and the sensor.The simulation of transformers PD experiments verifies that this method could further improve the positioning accuracy on the basis of direction-finding common perpendicular midpoint method.