For the of the phase compound excitation type AVR of a self-excited
synchronous generator, the AC side of the rectifier is connected with
capacitors delta connected. The function of these capacitor are (
).
A: resistance-capacitance protection of rectifier
B: compensate the generator terminal voltage change caused by the change
of load current
C: compensate the generator terminal voltage change due to load current
phase change
D: accelerated voltage built-up process
synchronous generator, the AC side of the rectifier is connected with
capacitors delta connected. The function of these capacitor are (
).
A: resistance-capacitance protection of rectifier
B: compensate the generator terminal voltage change caused by the change
of load current
C: compensate the generator terminal voltage change due to load current
phase change
D: accelerated voltage built-up process
举一反三
- The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power
- 100%<br/>Protection for generator stator single phase earth fault() A: zero<br/>sequence voltage protection B: third<br/>harmonic voltage protection C: zreo<br/>sequence current
- The no-load character of a 3-phase synchronous generator is the relationship between ( ). A: no-load emf Eo; exciting current If B: output<br/>voltage U; load current I C: output current I; exciting current If D: no-load<br/>emf Eo; load current I
- The inductor voltage phase lags its current by 90 o, and the capacitor current lags its voltage by 90 o, is this conclusion true? [ ]. A: It's impossible. B: When the capacitance and inductance are nonlinear components. C: When inductance current and voltage, capacitance current and voltage are not related direction. D: Whenever.
- For a balanced three-phase △ -connected load, the average power absorbed by the load is P . Change the △ -connected load to Y-connected load, the power will :