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A formulation based on 2D Cartesian and axisymmetric finite-element (FE) models, modified nodal analysis (MNA) and a multi-field system approach is proposed to analyze a three-phase power transformer. Interesting capabilities are thus achieved, overcoming the difficulties naturally arising with 3D simulations: high computational times and memory demand. A 2D Cartesian FE model is employed to represent...
In this work, a computer model for calculating surge distribution in power transformer windings is presented. The model is based on multiconductor transmission line theory, considering each disk coil as the basic element for the analysis. The electric parameters R, L, C and G are calculated by using conventional formulations. The electrical parameters are used for calculating modal parameters in order...
In this work a computer model for calculating surge distribution in transformer windings is presented. The transformer model is developed using transmission line theory. The capacitance, inductance, resistance and conductance are calculated with simple formulations. The electrical parameters are used for calculating modal parameters in order to represent the winding as a two port network. The model...
In this paper, a methodology for calculating the setting impedance of zones 2 and 3 of distance relays is presented, The aim is to reduce protection coordination problems during fault occurrence and changes in the network configuration. The proposed method is based on the impedance seen by the distance relay when faults are simulated on adjacent nodes. The coordination and relay setting is obtained...
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