5Albertson V D, Thorson J M, Miske S A, et al. The effects of geomagnetic storms on electric power system [J]. IEEE Trans. Power Appar. & Syst., 1974, PAS-93 (4):1031-1044.
6Albertson V D, Thorson J M, Clayton R E et al. Solar induced currents in power system: cause and effects[J]. IEEE Trans. Power Appar. & Syst., 1973, PAS-92(2): 471-477.
7Kappenman J G. Albertson for the geomagnetic storms [J]. IEEE Spect. Magaz., 1990,27(3):27-33.
8Walling R A, Khan A H. Characteristics of transformer exciting-current during geomagnetic disturbance[J]. IEEE Trans. Power Deliv., 1991,6(4):1707-1714.
9Price P. R. Geomagnetically induced current effects on transformers [J]. IEEE Trans. Power Deliv., 2002,17(4): 1002-8.
10You Y, Fuchs E. F, Lin D, et al. Reactive power demand of transfromers with DC bias[J]. IEEE Trans. Ind. Appl. Magaz., 1996,2(4):45-52.