题目内容

After synchronizing operation, the mainly reason why we cut off the syncro-scope is ( ).

A. power saving
B. synchroscope is for short-time duty
C. out of function for synchroscope
D. cannot shift active power if not cut off synchroscope

查看答案

搜索结果不匹配？点我反馈

更多问题

After the generator was overhauled, when the parallel operation was performed for the first time, it was found that the synchronizing lamps are not bright and dark at the same time, which indicated ( ).

A. Standby generator’s rotating speed is too high
B. Standby generator’s rotating speed is too low
C. phase sequence is not the same
D. leading phase of standby generator

查看答案

When synchronizing operation for synchronous generator, if other requirements all meet,only have phase difference, as phase difference is ( ) , there have the minimal surge current .

A. 0°
B. 45°
C. 90°
D. 180°

查看答案

For manually quasi-synchronizing method ( the nonimal frequency is 50 Hz ), the allowable differences of voltage, frequency and primary phase angle is ( ).

A. △U≤±6%UN、△f≤±0.5Hz、△δ≤±30°
B. △U≤±10%UN、△f≤±0.5Hz、△δ≤±15°
C. △U≤±10%UN、△f≤±2Hz、△δ≤±30°
D. △U≤±10%UN、△f≤±2Hz、△δ≤±15°

查看答案

During parallel operation, unless the disassemble inspection is performed, otherwise we don’t have to check whether ( ) or not.

A. the voltage effective value is the same
B. frequency is the same
C. the phase angle is the same
D. the phase sequence is the same

查看答案

After synchronizing operation, the mainly reason why we cut off the syncro-scope is ( ).

A. power saving B. synchroscope is for short-time duty C. out of function for synchroscope D. cannot shift active power if not cut off synchroscope

After the generator was overhauled, when the parallel operation was performed for the first time, it was found that the synchronizing lamps are not bright and dark at the same time, which indicated ( ).

When synchronizing operation for synchronous generator, if other requirements all meet,only have phase difference, as phase difference is ( ) , there have the minimal surge current .

For manually quasi-synchronizing method ( the nonimal frequency is 50 Hz ), the allowable differences of voltage, frequency and primary phase angle is ( ).

During parallel operation, unless the disassemble inspection is performed, otherwise we don’t have to check whether ( ) or not.

A. power saving
B. synchroscope is for short-time duty
C. out of function for synchroscope
D. cannot shift active power if not cut off synchroscope