Sumários
Conclusion of symmetric fault analysis; beginning of a single phase fault
7 novembro 2017, 09:30 • 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 modelSymmetric short circuit analysis
2 novembro 2017, 11:00 • Luis Marcelino Ferreira
How to compute Isc for any node of any network
The application of results from circuit analysis and linear system theory
Review of concepts of admittance and impedance
Interpretation of Zii and Zij
Computation of Isc thru Zii
Computation of sc voltages thru Zij
Shortcircuits
31 outubro 2017, 09:30 • Luis Marcelino Ferreira
What is meant by a shortcircuit
Nonsimultaneous sc
Effects of sh and the importance of sc analysis
How to model the network
Choice of an appropriate linear network
Review of basic linear circuits: concepts of admittance and impedance
1-port, 2-port, multiport networks
Thevenin equivalent
Superposition principle
Modelling of a sc using two opposite voltage sources
Overall summary