Chapter 29
Symmetrical and Unsymmetrical Faults
Transienten der Serie R—L
Consider a series R-L circuit.
When the switch closes at a time equal to zero, it mimics a three-phase short circuit in an unloaded synchronous machine.
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Dreiphasiger Kurzschluss – unbelastete Synchronmaschine
A three-phase short circuit test on an unloaded synchronous machine is conducted to study its impact.
The AC fault current's oscillogram with its DC ...
Dreiphasige Kurzschlüsse im Stromnetz
In fault current analysis, transformers are modeled using leakage reactances, while transmission lines are represented by equivalent series reactances.
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Bus-Impedanz-Matrix
The calculation of subtransient fault currents for three-phase faults in an N-bus power system is modeled by the positive-sequence network. A three-phase ...
Auswahl von Leistungsschaltern und Sicherungen
A circuit breaker interrupts fault currents by extinguishing the arc, which is elongated and cooled to stop the flow of electricity.
Breakers are ...
Sequenznetzwerke rotierender Maschinen
A Y-connected synchronous generator, grounded via neutral impedance, is designed to generate balanced internal phase voltages with only positive-sequence ...
Sequenzmodelle pro Einheit
An ideal Y-Y transformer grounded via neutral impedances has per-unit sequence networks similar to a single-phase transformer when balanced positive or ...
Fehlerarten
Consider a single line-to-ground fault from phase a to ground at a three-phase bus, including a fault impedance. This impedance is zero for a bolted ...
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