电塔之间的电缆都在一块,而不是在向外伸出的杆上分开挂着,每根电缆产生单独磁场,相互干扰,降低了电塔周围的总磁场。
The result is far less low-frequency radiation.
新式电塔大大减少低频辐射。
The combination of being less of an eyesore and producing less electrical smog should,TenneT hopes, soften objections to the construction of new overhead power lines.
TenneT希望不碍眼和低辐射能减少人们对修建新电塔的异议。
That is important for two reasons.
主要因为两点,
One, the alternativeburying high-tension linesis expensive and largely futile.
首先,掩埋高压线这一替换既贵又不实用。
The cost of putting a cable underground is between four and ten times as much as that ofcarrying it on a pylon.
把电缆埋在地底的花费是架电塔的四到十倍。
On top of that, the field generated by an alternating current interacts with the ground morestrongly than it does with the air.
除此之外,在地下交流电相互影响产生的磁场比在空中强烈很多。
This creates losses 40 times higher in a buried cable than in an aerial one. Unless thelong-distance-transmission system were converted to direct current, burial of transmissionlines is not a serious option.
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