A new method for ultrasonic array location of PD in power transformer based on FastDOA

The precise partial discharge(PD) locating in power transformer has important significance for the steady and safe operation. The Multiple Signal Classification Method (MUSIC) is an classical algorithom in DOA of ultrasonic array location. However,the estimation of the compelete covariance matrix and the subsequent eigendecomposition are computationally intensive and time consuming. A new fast subspace algorithom is adopted in this paper. The algorithom of FastDOA can rapidly obtain the signal subspace from a submatrix of the array covariance matrix without eigendecomposition and it only needs estimating the submatrix instead of estimating the whole covariance matrix. With the same direction-finding precision, the new algorithom has a low computational complexity and a faster operation speed. Based on this, crossover location principle is used to realize the space position of the PD source. Computer simulation results show the correctness and superiority of the new method.