基于阵列信号处理的变压器内局部放电源多目标定位方法

A Multi-Target Method to Locate Internal Partial Discharge Sources within Transformer Based on Array Signal Processing

提出了一种运用阵列信号处理技术实现变压器内多个放电源同时定位的新方法,该方法在变压器内壁安装两个超声波传感器阵列,通过传感器阵列接收目标空间辐射的超声波信号,应用阵列信号处理技术中的空间谱估计理论分析阵列传感器所接收信号的特征信息(信号源数、传播方向),并完成放电源数的估计、放电源方向的估计和放电源距离的计算,进而实现局部放电的多目标定位。仿真结果表明,该方法具有良好的分辨力和估计精度,能有效估计出变压器内多个放电点的空间位置。

A new method to locate multiple discharge sources within transformer by array signal processing is proposed, i.e. two supersonic sensor arrays are installed on inner wall of transformer tank to detect the supersonic signals emitted by partial discharge sources, and using the spatial spectrum estimation theory, of array signal processing technology the characteristic information of the signals received by the arrays （number of signal sources, propagation direction, etc.） are analyzed, then the estimation of number of discharge sources, the direction of discharge sources and the distances among discharge sources and sensors are determined respectively, after that the multi-target localization of partial discharge sources is implemented. Simulation results show that the proposed method possesses good resolution and estimation accuracy and can effectively estimate the spatial positions of multiple discharging points within transformer.