Values in our installations

Like any other unit or apparatus that operates with electrical energy, high-voltage electrical power lines generate an industrial-frequency electric and magnetic field. Its intensity will depend on various factors such as the voltage, the electrical power transported, the geometry of the support, the number of conductors, the distance of the cables from the ground, and so on..

The measurements taken inRed Eléctrica's installations give maximum values (at the closest point of the conductors to the ground) that vary between 3 and 5 kV/m for the electric field and between 1 and 15 µT for the magnetic field in 400 kV lines. Moreover, the field intensity decreases very quickly as the distance from the conductors increases: at 30 meters distance the electric and magnetic field levels vary between 0.2 and 2.0 kV/m and 0.1 and 3.0 µT, respectively, normally being below 0.2 kV/m and 0.3 µT above 100 meters distance.

In the case of 220 kV lines these values are lower, with values between 1 and 3 kV/m for the electric field and 1 and 6 µT for the magnetic field being recorded at the point closest to the conductors. At 30 meters distance, the electric and magnetic field levels vary between 0.1 and 0.5 kV/m and 0.1 and 1.5 µT, respectively, normally being lower than 0.1 kV/m and 0.2 µT above 100 meters distance.