In order to ensure the maximum continuous power supply of the marine electrical power system, the operating value setting principle of the short-circuit protection appliances at all levels of the power grid is: step by step towards the generator, the so-called "( )" principle.
A. automatic unloading device
B. inverse time limit
C. sensitivity
D. selectivity
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( ) adjusts the exciting current only according to load current; ( ) adjusts the exciting current only according to the load current pahse.
A. compound compensation/ phase compensation
B. compound compensation/phase compound compensation
C. phase compensation/compound compensation
D. phase compound compensation/phase compensation
In general, for the automatic frequency adjustment and load control device, cannot realize ( ).
A. let active power sharing even for two generators with different speed characteristic
B. keep network frequency fixed
C. receive disconnecting order,shifting load automatically
D. adjust the number of parallel running generators according to load
The active power distribution between two generator sets running in parallel is ( ) the speed droop coefficient.
A. proportional to
B. reciprocal to
C. irrelevant with
D. times square to
For two generators running in paralel, the 1# generator shares much less active power than 2# generaor. We should ( ) to make the active power is distributed evenly.
A. decrease the prime mover oil throttle of # 1 generator and increase the prime mover oil throttle of # 2 generator
B. increase the prime mover oil throttle of # 1 generator and decrease the prime mover oil throttle of # 2 generator
C. decrease the excitation current of # 1 generator and increase the excitation current of # 2 generator
D. Increasing the excitation current of # 1 generator and decreasing the excitation current of # 2 generator.
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