基于特征空间的油中局部放电定位研究

Research on Partial Discharge Location in Oil Based on Feature Space

变压器油中局部放电现象的产生会造成变压器的绝缘劣化,为设备运行带来潜在危险。为了对局部放电源进行及时准确的定位以确保电力系统的稳定运行,首先将基于特征空间的测向方法应用到变压器局部放电源的检测当中,结合阵列信号处理技术对局放源进行测向。然后根据测向获得的方向角信息,利用多阵列测向交叉定位原理,获取局放源的在变压器中的空间位置。最后采用MATLAB进行仿真研究。仿真结果表明,基于特征空间及多阵列测向交叉定位进行局放源定位的误差在3.4cm左右,精度较高,满足实际工程要求。因此,基于特征空间的油中局部放电定位方法是可行的。

The phenomenon of partial discharge（ PD） in transformer oil can cause the insulation deterioration,which endangers the normal operation of the transformer. In order to detect the PD timely and accurately to ensure the stable operation of the power system,firstly,the direction finding method based on feature space is applied to the detection of the transformer partial discharge source,and by combining with the array signal processing technology,the direction of arrival（ DOA） of partial discharge source is conducted. Then according to the direction information obtained by direction finding,the space position of the power source is obtained by using multi array direction finding cross localization principle. At last,the simulation is carried out in MATLAB. The simulation results show that the average error of the PD source location based on feature space and multi array direction finding cross localization principle is 3. 4 cm,which meets the practical requirements. Therefore,the detection method based on feature space is feasible.