8Poza F,Marino P,Otero S,et al. Programmable electronic instrument for condition monitoring of in-service power transformers[J]. IEEE Trans. Instrum.& Meas.,2006,55(2) : 625-634.
9Alessandro E C, Francesco M, Mario T. Diagnosis of the state of power transformer windings by on-line measurement of stray reactance. IEEE Trans. Instrum & Meas, 1993,42(2) : 372-378.
10Leibfried T, Feser K. Monitoring of power transformers using the transfer function method. IEEE Trans. Power Deliv., 1999,14(4): 1333-1341.
