中性点不接地的星形接线变压器, 当三相同时进幅值为 U0 的波时, 中性点的最大电位可达( )<br>· <img src="/lqwvjeImg/a2/a20ab1415633db54be61b77f4fea9747.png"style="width:47px;height:57px;"><br>· <img src="/lqwvjeImg/66/66631de0eba3cebce267515c21790c7f.png"style="width:55px;height:67px;"><br>· <img src="/lqwvjeImg/22/22408166a530c94f430085028052f680.png"style="width:58px;height:59px;"><br>· <img src="/lqwvjeImg/96/96efb0f7dfd34f6fe54a70f9a4b4f5a1.png"style="width:54px;height:62px;">