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【单选题】
一台三相电力变压器，额定容量S=500KVA，额定电压U=10/0.4KV，高低压绕组均为Y连接，其低压侧的额定电流是（） A 28.87AB.
721.7A
C.
1250A （提示30。5=1.732）
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