对于单回线杆塔，中相串的单片绝缘子承受最大电压值比边相串高；
The maximal withstand voltage of single insulator for the middle string of single circuit tower is more than the side string.
对于单回线杆塔，中相串的单片绝缘子承受最大电压值比边相串高；
The maximal withstand voltage of single insulator for the middle string of single circuit tower is more than the side string.
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