6th Month Final Flashcards
The nominal load is
Equal to the rated load
A period of voltage instability will always result in a voltage collapse.
False
The critical voltage and critical MW transfer are located at
The knee of the P-V curve
During voltage collapse prone conditions, tap changing to support secondary voltage should generally NOT be used if the secondary load is formed by
Non-motor type load
P-V curves indicate the ____ margin from voltage instability while V-Q curves indicate the ____ margin from voltage stability
MW, MVar
UVLS differs from UFLS in that:
UVLS is based on voltage while UFLS is based on frequency
In which type of voltage collapse does a key element outage trigger the collapse
Classical voltage collapse
A P-V curve relates
The MW transferred across a system to the voltage at the receiving end of the system
In a radial power system, the addition of shunt capacitors at the receiving end of the system tends to
Flatten the P-V curve and increase the critical voltage
In which type of voltage collapse does a simultaneous stalling of large amounts of induction motor load trigger the voltage collapse
Transient voltage collapse
A radial power system is a power system in which generation and load areas are separated by a transmission path
True
Tap changer impact is not only due to their draw of reactive from the high side but also to their impact on the magnitude of customer load
True
Power system load is constantly changing
True
The increasing voltages due to the sudden increase in Mvar demand may cause uncontrolled tripping and rapid collapse of the area power system
False
Dynamic reactive reserves are typically carried in synchronous generators, synchronous condensers, or SVC’s
True
