Chapter 29
Symmetrical and Unsymmetrical Faults
Series R—L Circuit Transients
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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Three-Phase Short Circuit—Unloaded Synchronous Machine
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 ...
Power System Three-Phase Short Circuits
In fault current analysis, transformers are modeled using leakage reactances, while transmission lines are represented by equivalent series reactances.
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Bus Impedance 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 ...
Circuit Breaker and Fuse Selection
A circuit breaker interrupts fault currents by extinguishing the arc, which is elongated and cooled to stop the flow of electricity.
Breakers are ...
Sequence Networks of Rotating Machines
A Y-connected synchronous generator, grounded via neutral impedance, is designed to generate balanced internal phase voltages with only positive-sequence ...
Per-Unit Sequence Models
An ideal Y-Y transformer grounded via neutral impedances has per-unit sequence networks similar to a single-phase transformer when balanced positive or ...
Fault Types
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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