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【单选题】
某125MW火电机组低压厂变回路从6kV厂用工作段母线引接，该母线短路电流周期分量起始值为28kA。低压厂变为油浸自三相变压器，参数为：Se=1000kVA，Ue=6.3/0.4kV，阻抗电压Ud=4.5%，接线组别Dynll，额定负载的负载损耗Pd=10kW。DLi为6kV真空断路器，开断时间为60ms；DL2为0.4kV空气断路器。该变压器高压侧至6kV开关柜用电缆连接；低压侧至0.4kV开关柜用硬导体连接，该段硬导体每相阻抗为Zm=（0.15+j0.4）mΩ；中性点直接接地。低压厂变设主保护和后备保护，主保护动作时间为20ms，后备保护动作时间为300ms。低压厂变回路接线及布置如图3-3所示，请解答下列各小题（计算题按最接近数值选项）。请根据变压器布置图，在下列选项中选出正确的H、L、M、N值，并说明理由（）。
A.
H≥2500mm，L≥600mm，M≥600mm，N≥800mm
B.
H≥2300mm，L≥600mm，M≥600mm，N≥800mm
C.
H≥2300mm，L≥800mm，M≥800mm，N≥1000mm
D.
H≥1900mm，L≥800mm，M≥1000mm，N≥1200mm
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【单选题】The Television Camera The television camera is rather like the human eye. Both the eye and the camera have a lens, and both produce a picture on a screen. In each case the picture is made up of millio...
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相关题目：
【单选题】— What country is west of the U. S.? — ____________________. [     ]
A.
China
B.
Canada
C.
U. K.
查看完整题目与答案
【多选题】希腊神话和传说中,下列选项中属于大力神故事的有
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【简答题】Both of them found work in _____(hospital, the hospital).
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