看看高压线长什么样

Transmission lines mostly use three phase alternating current (AC),
Electricity is transmitted at high voltages (110 kV or above)






看看这家就在高压线旁


其它的你看到的可能不是高压线

读读这篇文章很好：
http://www.siliconvalleyrealestateinfo.com/2008/01/03/electric-and-magnetic-fields-emfs-and-how-they-effect-real-estate-prices/