does AC transmission lines radiate electromagnetic waves? if yes how to calculate it? isn't it a loss of power

Answer 1

An alternating current in any conductor will cause electromagnetic waves to be radiated, resulting in a small loss of power. I don't have the formulas to calculate it; you should consult a book on electromagnetics. Nor do I know the parameters other than frequency, which is either 50 or 60 Hz.

However, you have much more loss of power due to the resistance of the cables. With AC current, you also have the "skin" effect where most of the current is carried in the outer part of the conductor. This is the primary reason that very high voltages are used for power transmission, because the current is reduced proportionately.

There is also a small loss of power due to capacitive coupling between conductors and the ground. That is one of several reasons that power wires are high in the air.

You don't pay directly for these power losses, since they occur before the power gets to your electric meter. But they are factored into the cost of your electricity.

I have heard that there is research into the transmission of electrical power by direct current, but don't have any knowledge if it has been put into practice. DC would overcome the problem with skin effect and capacitive loss. It would also not radiate electromagnetic waves. However, you've got the problem of converting very high voltage DC to AC at the destination. There is also a problem with the high voltage switches on the transmission lines, because the contacts would draw an arc when they open. A number of technical difficulties exist that I suppose will be overcome one day.

Answer 2

O man what r u doing this on web . Ucan nver find an answer on web of this type. U must pick book up Electrmagnetic wave theory by jodan balmain

Answer 3

yes they does radiate and yes it's a power loss but energy providers take that loss into account when you pay your bill, don't worry =P
but i'm not good enough to calculate it
one thing is for sure if you could invent a superconductor at ambient temperature you could make some BIG BIG bucks =)

Answer 4

yes AC transmissionpower cable give high magnetic power,as much voltage raised up as magnetic fields raises with cooperation with how much current passes through but usuals air gap isolation done according the voltage level,you can the see that in hight tension transmission wires,the magnetic fields can be measured.

Answer 5

Yes they emit the emt waves. there are some specially instrument available to find the strength of magnetic field. you will find these instrument with your ac(air condition) mechanic