根据国家电网(他们也需要尽早更换输电线路)所说：这使得安装地下电缆比架空线路昂贵12到17倍。
That makes installing subsurface cables 12 to 17 times as pricey as overhead lines, according to National Grid (they also need replacing sooner).
由于电缆的充电功率比普通架空线路高一个数量级，如何进行无功补偿是一个需要认真研究的课题。
As charging power of cable is about one order of magnitude higher than general overhead line, how to compensate reactive power is a new subject to us.
架空线路单位长度的停电数要比地下电缆的多，但停电持续时间短。
Overhead lines have more outages than underground cable per unit length, but the outages are usually shorter in duration.
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