Characteristics of transformer exciting-current during geomagnetic disturbances
Authors:
- R.A. WallingRWR.A. Walling
- A.N. KhanAKA.N. Khan
- 1 January 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Delivery
- Vol. 6 (4) , 1707-1714
Abstract
An efficient method allowing the transformer flux offset and exciting-current waveform to be determined for combined AC and geomagnetically induced current (GIC) excitation, without lengthy time-domain simulations, is described. This iterative approach solves for the equilibrium saturation condition using lumped-parameter nonlinear magnetic-circuit models. In addition to investigating single-phase transformer performance, the authors examine the performance of certain three-phase transformer types for which GIC results in phase imbalance.Keywords
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