Podcast
Questions and Answers
What determines the frequency in an AC power system?
What determines the frequency in an AC power system?
- The operation of consumer appliances
- The balance between generation and demand (correct)
- The type of transformers and induction motors used
- The amount of renewable energy sources used
Why would large frequency drops be damaging to transformers and induction motors?
Why would large frequency drops be damaging to transformers and induction motors?
- Due to the high reactive power supplied by the generators
- Due to the low magnetizing currents required for maintaining the flux
- Due to the high magnetizing currents required for maintaining the flux (correct)
- Due to the low reactive power supplied by the generators
What are turbine blades designed to avoid?
What are turbine blades designed to avoid?
- Excessive heat generation
- Excessive wear and tear
- Corrosion due to high frequency
- Mechanical vibrations at their natural frequencies (correct)
Why may a 50 Hz steam turbine not be able to withstand frequency deviations greater than ±2.5 Hz?
Why may a 50 Hz steam turbine not be able to withstand frequency deviations greater than ±2.5 Hz?
What is the operational range for system frequency, according to power quality considerations?
What is the operational range for system frequency, according to power quality considerations?
Why must system frequency remain within its operational range?
Why must system frequency remain within its operational range?
What is the primary purpose of automatic load shedding in the operation of turbo-generators under abnormal system operating conditions concerning frequency?
What is the primary purpose of automatic load shedding in the operation of turbo-generators under abnormal system operating conditions concerning frequency?
Why does the reduction in frequency cause generator control systems to increase their input power?
Why does the reduction in frequency cause generator control systems to increase their input power?
Why does a reduction in frequency and an increase in power may result in an increase of the internal temperature of the turbine and generator windings?
Why does a reduction in frequency and an increase in power may result in an increase of the internal temperature of the turbine and generator windings?
What is the purpose of primary frequency control after an underfrequency event?
What is the purpose of primary frequency control after an underfrequency event?
What is the purpose of secondary frequency control if the under-frequency event does not correct itself?
What is the purpose of secondary frequency control if the under-frequency event does not correct itself?
What is the maximum operating time of a 60 Hz steam turbine at full load when its frequency drops to 58.8 Hz?
What is the maximum operating time of a 60 Hz steam turbine at full load when its frequency drops to 58.8 Hz?
How do grid operators typically respond if the frequency starts to exceed 60/50 Hertz?
How do grid operators typically respond if the frequency starts to exceed 60/50 Hertz?
Why are under-frequency events more serious compared to over-frequency events?
Why are under-frequency events more serious compared to over-frequency events?
What is done when under-frequency events occur?
What is done when under-frequency events occur?
What increases as a result of a reduction in frequency and an increase in power?
What increases as a result of a reduction in frequency and an increase in power?
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