Will high-voltage lines cause electromagnetic radiation hazards
1. There is no electromagnetic radiation, only electromagnetic induction
Like substations, the actual impact of high-voltage transmission lines on the surrounding area is mainly due to electromagnetic induction effects, rather than electromagnetic radiation.
This is because, although the voltage in high-voltage transmission lines is very high, the frequency of the transmitted electrical energy is still 50 hertz, so only electromagnetic induction phenomenon will occur, not electromagnetic radiation.
2. Don't treat "corona" as electromagnetic radiation!
The sparks generated by transmission lines are professionally called corona. Corona discharge is a discharge phenomenon that occurs due to the high electric field intensity on the surface of transmission lines, causing air ionization. The dissociation strength of air molecules is generally 20-30 kV/cm. When the surface electric field strength of the transmission line exceeds this value, a hissing discharge sound can be heard from the line, the smell of ozone can be smelled, and at night, blue purple fluorescence can be seen around the wire, which is corona discharge.
Corona on power lines can cause corona losses, power frequency electromagnetic fields (AC transmission), DC electric field effects (DC transmission), radio interference (high-frequency pulse currents), and audible noise, but it does not generate high-frequency radiation and does not pose a threat to human health.
3. What you need to consider for high-voltage transmission lines is safety
The air discharge voltage under standard atmospheric conditions is approximately 30kV/cm, which means the theoretical discharge distance of 330kV is 11cm. Considering actual conditions (weather conditions, geographical location, etc.), the actual discharge distance may be much smaller than this value. From this, it can be seen that the discharge distance of 330kV transmission lines is very small, and its safety distance can be imagined to be not very large. Currently, the insulation distance left when setting up the line far exceeds the safety distance of the above standards.
