To keep voltage and frequency of network fixed, if we shift active power of parallel running generators manually, we need to adjust ( ).
A. exciting current
B. voltage-sharing
C. oil throttle of the prime mover
D. AVR
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For two same type generators running in parallel, if the speed regulation characters of the governor are different, when the total active power decreases, then ( ). ( running without automatic frequency adjustment and active power distribution devices)
A. the output power of the generator with smaller speed droop is smaller
B. the output power of the generator with bigger speed droop is smaller
C. the output power of the two generators are the same
D. A or B
In the marine power system,the frequency adjustment and distribution of active power are realized by ( ) collectively.
A. governor of prime mover
B. automatic frequency adjustment and load control device
C. governor of prime mover and self-excitation voltage regulator
D. governor of prime mover, automatic frequency adjustment and load control device
For two generators running online in parallel, if we only increase oil throttle of one generator, and keep another generator unchanged, then it will lead to ( ).
A. decrease of frequency
B. increase of frequency
C. vibration of frequency
D. decrease of voltage
The reason for the failure of synchronizing operation, the reason cann’t be ( ) for the generator under normal running condition.
A. improper operation, random switching on under conditions that do not meet parallel operation conditions
B. failure to shift loads in time after the synchronizing operation is finished
C. The online generator is running under no-load
D. phase sequence is not the same
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