Stealing Electricity by induced EMF

AI Thread Summary
The discussion centers on the feasibility of "stealing" electricity through electromagnetic induction near transmission lines. Participants share anecdotes about farmers allegedly using coils or antennas to tap into nearby power sources, with mixed outcomes regarding legality and detection by power companies. It is noted that while some methods may yield minimal energy, significant extraction would require high currents or voltages, posing safety risks. The consensus highlights that any substantial attempt to extract power without permission is illegal and can negatively impact the electricity provider. Additionally, the cost of setting up such systems would likely outweigh the benefits, with solar energy being a more viable and legal alternative for energy generation.
khermans
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I was wondering just how possible it is to "steal" electricity by inducing an EMF near the transmission cable? Does the electric company have ways to detect this or have counter-measures set up? How big would the wire need to be and made of what material? I am very interested in how all of this works and I am thinking about writing an article about it as not many have heard of this. Most people think of stealing electricity as stealing someone's else's meter, but this method is quite infantile. Please keep details to a scholarly level and DO NOT post instructions on how to do it per se...

Kristian Hermansen
 
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I've heard a story where a farmer whose barn was right underneath some high-voltage lines, set up many many copy coils in the barns roof and was able to steal electricity that way. The power company noticed because of the extra drain on the transmission lines there, or something like that and put a stop to it.
 
check said:
I've heard a story where a farmer whose barn was right underneath some high-voltage lines, set up many many copy coils in the barns roof and was able to steal electricity that way. The power company noticed because of the extra drain on the transmission lines there, or something like that and put a stop to it.

I've heard stories about farmers "stealing" energy from those megawatt AM stations by putting up antennas and rectifying the power. In some versions I hear that this was found to be perfectly legal, and the radio stations agreed to pay the farmer's electric bills if he'd only stop interfering with their broadcasts. In other versions, I hear that the farmer was ordered to stop. I don't know what the truth, if any, is. But I never heard about stealing through "EMF". You'd either want very high currents to tap into the magnetic field, or else very high voltage to tap into the electric field (but in the later case, if the field gets too high, the possibility of an arc-over from the HV to your equipment exists).
 
I've heard of farmers' cows "stealing" electricity from the overhead lines. They didn't enjoy it; they got a shock every time they took a drink of water. SOme poor farmer went out of business not knowing why his cows were perpetuately dehydrated.

The amount of electricity you could "pull" out of the air using e-m induction would be miniscule from ground level (the two or three power lines operate out of phase and effects would cancel) and outright fatal at close range.

That previous post about stealing AM radio power sounds neat, I'd try that first.
 
Hidden induction tapping of anyone's electrical power source, commercial or private, is illegal. The reason is that it DOES reduce the power output of the provider without their permission.
Aerial methods to extract DC from EM waves are common with any radio device(as that is how they function), but any concerted effort to set-up an aerial environment and use it to "gain or profit" to any substantive degree that notably effects provider services is prohibited. That is, create an aerial environment to extract radio waves to light an LED? Go for it. Do it to power your house and your neighbors reception is effected? No.
 
BTW, the costs associated with setting up an aerial EM extraction of any usefulness would be so expensive that one's monies would be far, far better spent on a quality solar cell array(and with no legal if's!)
 
I was using the Smith chart to determine the input impedance of a transmission line that has a reflection from the load. One can do this if one knows the characteristic impedance Zo, the degree of mismatch of the load ZL and the length of the transmission line in wavelengths. However, my question is: Consider the input impedance of a wave which appears back at the source after reflection from the load and has traveled for some fraction of a wavelength. The impedance of this wave as it...
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