地下电缆线路还具有维修困难的缺点…
Underground lines have the further disadvantage of poor accessibility.
地下电缆线路与变电站联接时还会碰到问题。
Problem is also encountered in connections between underground lines and substations.
电力电缆线路保护区：地下电缆为线路两侧各零点七五米所形成的两平行线内的区域；
Power cable route protection zone: the areas between two parallel lines formed by 0.75 meters on both sides of the ground mark of underground cable route;
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