Sumários
Single phase fault by direct analysis
4 novembro 2014, 09:30 • Luis Marcelino Ferreira
Three phase (ABC) analysis without tranforms
Circuit analysis
Coupling impedances
Dimensionality increases three fold
Conclusion of symmetric fault analysis and single phase fault
30 outubro 2014, 11:00 • Luis Marcelino Ferreira
Review of how to compute Isc:
Thevenin impedance Zii and voltage source V0
Superposition needed for voltage calculation
How to compute voltage due to -V0
Simplicity of final formula: Vj=Vj0-Zij/Zii*Vi0
Conclusion of symmetric fault analysis;
Imbalance: single phase fault
Generator model: simplest model, impedances behind E's
Now voltages and currents are 3-dimension vectors
Impedances are (3x3)
How to simply compute Isc
What about voltages?
Importance of mutual coupling
Characteristicas of the Z matrix for the generator model