PHEP CH28 Generator Voltage Regulators Flashcards
The voltage output of an AC generator is controlled by
Varying the DC excited voltage
The major difference between various voltage regulator systems is merely the method by which:
field circuit resistance and current are controlled
The voltage held by the vibrating type voltage regulator can be adjusted by
Varying the weight W and adjusting the tension of the DC solenoid spring
All of the following statements concerning the rheostat type voltage reguiator are true EXCEPT for.
the primary purpose of the exciter field rheostat is to adjust the generator output voltage
Wide-range excitation control is sometimes provided for in voltage regulator arrangement for large generators using separately excites main exciters by using a:
Wheatstone bridge rheostat
When the regulator control swich for the amplidyne voltage regulator is in the ON position the effect is to:
ALL OF THE ABOVE
- Reduce the exciter field current
- Lower the exciter voltage
- decrease the field current and terminal voltage of the AC generator
In order to provide for proper division of reactive current between AC generators operating in parallel, their voltage regulators incorporate a scheme called:
Cross-current compensation
Of the following statements concerning synchronous condensers, which one is not true?
the excitation range is maintained less than that for AC generators to prevent loss of synchronism
In the rheostat type voltage regulator, when the terminal voltage of the AC generator starts to fall, the action of the torque motor:
short-circuits more of the high-resistance plates
System stabilty can be mantained and a faster time-response to load changed obtained by using voltage regulators equipped with:
both a feed back control system and an electronically controlled separate motor
