问题 单项选择题

某工厂拟建一座110kV终端变电站,电压等级110/10kV,由两路独立的110kV电源供电。预计一级负荷10MW,二级负荷35MW,三级负荷10MW。站内设两台主变压器,接线组别为YNdll。110kV采用SF6断路器,110kV母线正常运行方式为分列运行。10kV侧采用单母线分段接线,每段母线上电缆出线8回,平常长度4km。未补偿前工厂内负荷功率因数为86%,当地电力部门要求功率因数达到96%。请回答下列问题。

若该电站10kV系统中性点采用消弧线圈接地方式,试分析计算其安装位置和补偿容量计算值应为下列哪一选项?(请考虑出线和变电站两项因素)()

A.在主变压器10kV中性点接入消弧线圈,其计算容量为249kVA

B.在主变压器10kV中性点接入消弧线圈,其计算容量为289kVA

C.在10kV母线上接入接地变压器和消弧线圈,其计算容量为249kVA

D.在10kV母线上接入接地变压器和消弧线圈,其计算容量为289kVA

答案

参考答案:D

单项选择题 A1/A2型题
单项选择题

Now which are the animals really to be pitied in captivity First, those clever beings whose lively urge for activity can find no outlet behind the bars of the cage. This is most conspicuous, even for the uninitiated, in the case of animals which, when living in a free state, are accustomed to roaming about widely. Owing to this frustrated desire, foxes and wolves housed, in many old-fashioned zoos, in cages which are far too small, are among the most pitiable of all caged animals.
Though pinioned swans generally seem happy, under proper care, by hatching and rearing their young without any trouble, at migration time things become different: they repeatedly swim to the lee side of the pond, in order to have the whole extent of its surface at their disposal, trying to take off. Again and again the grand preparations end in a pathetic flutter of their half wings ; a truly sorry picture !
This, however, rarely awakens the pity of the zoo visitor, least of all when such an originally highly intelligent and mentally alert animal has deteriorated, in confinement, into a crazy idiot, a very caricature of its former self. Sentimental old ladies, the fanatical sponsors of the societies for Prevention of Cruelty to Animals, have no compunction in keeping a grey parrot in a relatively small cage or even chained to a perch. Together with the large corvines, the parrots are probably the only birds which suffer from that state of mind, common to prisoners, namely, boredom.

Which is the "lee side" of the pond

A. The side the wind is blowing from.
B. The side which is sheltered from a storm.
C. The side the wind is blowing towards.
D. The side where the water is the deepest.