由于地下输电系统的修理时间较长，因此有时就安装双套重复设施以降低重叠停电的危险。
Because of the longer repair time for underground transmission systems, expensive duplication facilities are sometimes installed to reduce the risk of overlap-ping outages4.
根据目前的技术，据估计，在市郊地区地下输电线路的造价平均是架空线路的8.5—1 O倍。
On the basis of present technology, it is estimated that in suburban areas underground lines cost, on the average, about 8.5 - 10 times more than overhead lines .
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).
反对这些高耸的输电塔的人说，能解决这个问题的是把输电线埋在地下：现今英国有13，00千米的高压电缆，但只有950千米的高压电缆埋在地下，它们多数埋在市区。
Opponents of towering pylons say the answer is to bury power lines: at present only 950km of Britain’s 13, 000km of high-voltage cable runs underground, most of it in urban areas.
居民被搬迁，工厂被关闭，输电线被埋到地下，运河得到治理。此外还建起了停车场、游客中心和旅馆。
Residents were moved. Factories were shut down. Power lines were buried underground. The canals were cleaned up. Parking lots, visitor centers and hotels were built.
用于高压输电线杆接地网及石油化工地下管线防腐、导电、防静电用。
Be applied for the corrosion protection, conduction and electrostatic transfer of earthed systems and underground pipes.
在一些城市，第三道铁轨(电动机车的输电轨)给通常在地下运行的地铁列车供电，电力通过这道铁轨传输。
In some cities, a third rail provides power to a subway train, usually operating underground; electricity passes through the rail.
电力从发电站经由输电塔或地下的电缆输送到我们家里去。
Electricity is transmitted from the power station to your home. It travels through large cables supported by pylons or buried underground.
电力从发电站经由输电塔或地下的电缆输送到我们家里去。
Electricity is transmitted from the power station to your home. It travels through large cables supported by pylons or buried underground.
应用推荐