Effects of Iron-Core Topology on Inrush Currents in Three-Phase Multi-Leg Power Transformers
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This paper investigates the inrush currents of three-phase (a)symmetric multi-leg transformer cores considering magnetic core structure (e.g., three-leg vs. five-leg) and switching effects (e.g., recloser operating). The electromagnetic steady-state and transient behavior of three-phase transformers significantly differs from single-phase transformer operation mainly because of the unique flux coupling interactions in multi-leg and asymmetric core structures. A recently developed three-leg nonlinear transformer core model is applied to this study which considers the influence of magnetic hysteresis, flux couplings in the core-structure and nonsinusoidal operation in three-phase transformers. Simulations results for multi-leg (e.g., three-leg and five-leg) transformer cores demonstrating inrush current behavior based on the model are presented and discussed.
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Operation and performance of three-phase asymmetric multi-leg power transformers subjected to nonlinear and dynamic electromagnetic disturbancesMoses, Paul S. (2012)Three-phase power transformers continue to be an important fixture in modern power systems since their initial development in the 1880s. While transformer design has fundamentally remained the same, the operating ...
Dynamic Modeling of Three-Phase Asymmetric Power Transformers with Magnetic Hysteresis: No-Load and Inrush ConditionsMoses, Paul; Masoum, Mohammad Sherkat; Toliyat, H. (2010)A new dynamic model of a three-phase three-leg transformer for steady-state and transient operating conditions is proposed in this paper. With very few exceptions, the existing models oversimplify the magnetic interactions ...
Masoum, Mohammad; Moses, Paul (2008)A new nonlinear model has been adapted to include Geomagnetically Induced Currents (GIC) entering the neutrals of three-phase transformers. A time-domain nonlinear transformer model has been implemented under steady-state ...