单项选择题

某220kV变电站位于III级污区，装设180MVA主变压器2台，220kV母线短路电流为12kA；220kV出线6回，全部为负荷线，其中最大输送容量为150MVA；如果220kV出线电流互感器的瓷套平均直径为450mm，试回答以下各题。
选择出线回路电流互感器变比和准确K值系数（）。

A.1000/5A,10倍；
B.600/5A，20倍；
C.800/5A,15倍；
D.750/5A,18倍。
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听力原文：M: Did you take these pictures? They're very gooD.W: Yes, I think they turned out well too. I like to take my camera with me wherever I go. That way, if I see something interesting, I can snap a picture of it.M: Carrying a big camera around is too much trouble for mE.W: My camera is really small, though. Here let me show you.M: That is a compact camera, but you really must know a lot about photography to get such professional looking results.W: Not necessarily. This camera is simple to operatE.M: Does this model come with flash attachment for indoor shots?W: Better than that! It has a built-in electronic flash and an automatic focus too. I don't even have to worry about focusing.M: That's what I neeD.When I take pictures they usually come out blurry because I don't adjust the lenses properly and I hate photos that are out of focus. Is a camera like yours very expensive?W: Less than you'd expect. Why don't you check the prices at Hatfield's down the street? This model was on sale there last week.M: I think I will, it certainly won't hurt to take a look.As the conversation begins, what are the man and the woman doing?A.Looking at some photographs.B.Selling cameras.C.Teaching a photography class.D.Repairing camera equipment.
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单项选择题
某110kV变电站，位于城镇郊外，装设40MVA主变压器2台，三级电压为110kV 35kV 10kV；110kV出线2回，线路较长并穿过多雷山区，事故多发，线路无穿越功率；35kV出线6回；1OkV出线10回；各级电压短路电流水平为：110kV为25kA、35kV为20kA、1OkV为16kA；无功补偿电容器组装设于10kV，补偿容量按主变压器容量的20%,电网背景谐波为5次及以上。现有库存电容器，额定电压为11kV,额定容量334kvar，用于上述10kV电容器组时，下面设想正确的是（）。
A.采用单星形接线，但输出容量要降低；
B.采用三角形接线，输出容量不会降低；
C.采用桥形接线；
D.采用单星形接线和相电压差动保护。
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