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【单选题】
以下关于三相异步电动机的说法中，正确的是（ ）。A.
在供电变压器容量较大，电动机容量较小的前提下，三相异步电动机可以直接起动；当 经验公式时，电动机可以直接起动
B.
电动机在额定电压下直接起动，直接起动电流约为额定电流的5～7倍
C.
在鼠笼式异步电动机Y-△降压起动中，交流接触器起到短路保护作用
D.
鼠笼式异步电动机采用星形三角形起动时，每相绕组上的电压降到正常电压的1／3，所以，起动转矩也降低到正常运转时转矩的1／3
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