Can You Have "directional Wireless Power Transmission (to Power an LED)

Polarity will not work; this sort of "wireless power transmission" is really a transformer, and transformers only pass AC.You could potentially use the orientation of the field, ie, have two solutions at right angles to each other, but a lot of contemporary solutions have the field oriented vertically, so that wo not work either.Instead, what you would probably want to do is to modulate information in a detail of the drive signal - possibly something as simple as a small change in frequency, or a pattern of pulses and gaps. Or you could just use some cheap radio technology.The advantage of the latter is that you could give in and use a battery for power after all, which you are likely to find quite a bit easier to get working.Easiest still would be a battery and some reed switches, and then put magnets or electromagnets in the base; then you do not even need to do low-power design to preserve your battery, since the reed switch functions as an actual switch.

Can You Have

1. Can I tell the voltage of High Power Transmission lines by its Type?

You can determine the voltage imposed on the wires. This is done by looking at the insulators holding the wires off the tower. The more discs, the higher the voltage. Those look like pretty high voltage, for long distance distribution. However, voltage has nothing to do with the electromagnetic fields. That is determined by the current in the wires. That's not so easy to determine.However, since you are interested in the electromagnetic fields at your location, the power company has an EMF meter they use to measure such a thing. I do not know the arrangements for this, but call them and ask. They came out and did a survey at my house when I sold it, so I know the service is available. I do not recall having to pay for it

2. Magnetic coil failure

It can be a localised spike in temperature, as Ignacio says in the comments, that easily melts such thin wire.MOhm for a small inductor coil means completely broken, certainly if it used to be Ohms.It can be that the increased temperature was from using an inefficient frequency, but, since you are not referring to any current known or observed, I would say it's over-current. If you look in this PDF you can see that for simple chassis wiring or a bundle for power transmission the current limit for AWG40 is already in the tens of miliAmps, and they just do not say for enything tinier. I would estimate the limit for AWG46 will be around 25mA or so, if not lower. And that's only for a couple of wires together for a coil you need to lower that, usually by at least 30%, depending a bit on the coil shape and build-up.

Can You Have

3. Is maximum transferable power on a transmission line (as dictated by the power vs loading angle curve) the same as the same transmission line's maximum thermal power limit or not?

The maximum power that can flow on an AC line, is the amount of power corresponding to power angle of 90 degrees. This limit is much less than thermal limit of the line. This is a limitation of AC transmission.On the other hand, in case of DC transmission line, line can be loaded upto its thermal limit.

4. Suddenly, Wireless Power Transmission Is Everywhere

Wireless power transfer exists right now, but it's not as cool as Tesla's Wardenclyffe tower and it's not as stupid as an OSHA-unapproved ultrasonic power transfer system. Wireless power transfer today is a Qi charger for your phone. It's low power - just a few amps - and very short range. This makes sense; after all, we are dealing with the inverse square law here, and wireless power transfer is not very efficient. Now, suddenly, we can transfer nearly two kilowatts wirelessly to electronic baubles scattered all over a room. It's a project from Disney Research, it's coming out of Columbia University, it's just been published in PLOS one, and inexplicably it's also an Indiegogo campaign. Somehow or another, the stars have aligned and 2017 is the year of wirelessly powering your laptop. The first instance of wireless power transfer that's more than just charging a phone comes from Disney Research. This paper describes quasistatic cavity resonance (QSCR) to transfer up to 1900 Watts to a coil across a room. In an experimental demonstration, this QSCR can power small receivers scattered around a 50 square meter room with efficiencies ranging from 40% to 95%. In short, the abstract for this paper promises a safe, efficient wireless power transfer that completely removes the need for wall outlets. In practice, the QSCR from Disney Research takes the form of a copper pole situated in the center of a room with the walls, ceiling, and floor clad in aluminum. This copper pole is not continuous from floor to ceiling - it's made of two segments, connected by capacitors. When enough RF energy is dumped into this pole, power can be extracted from a coil of wire. The video below does a good job of walking you through the setup. As with all wireless power transmission schemes, there is the question of safety. Using finite element analysis, the Disney team found this room was safe, even for people with pacemakers and other implanted electronics. The team successfully installed lamps, fans, and a remote-controlled car in this room, all powered wirelessly with three coils oriented orthogonally to each other. The discussion goes on to mention this setup can be used to charge mobile phones, although we are not sure if charging a phone in a Faraday cage makes sense. If the project from Disney research is not enough, here's the MotherBox, a completely unrelated Indiegogo campaign that was launched this week. This is not just any crowdfunding campaign; this work comes straight out of Columbia University and has been certified by Arrow Electronics. This is, by all accounts, a legitimate thing. The MotherBox crowdfunding campaign promises true wireless charging. They are not going for a lot of power here - the campaign only promises enough to charge your phone - but it does it at a distance of up to twenty inches. At the heart of the MotherBox is a set of three coils oriented perpendicular to each other. The argument, or sales pitch, says current wireless chargers only work because the magnetic fields are oriented to each other. The coil in the phone case is parallel to the coil in the charging mat, for instance. With three coils arranged perpendicular to each other, the MotherBox allows for 'three-dimensional charging'. Does the MotherBox work? Well, if you dump enough energy into a coil, something is going to happen. The data for the expected charging ranges versus power delivered is reasonably linear, although that does not quite make sense in a three-dimensional universe. Is it finally time to get rid of all those clumsy wall outlets? No, not quite yet. The system from Disney Research works, but you have to charge your phone in a Faraday cage. It would be a great environment to test autonomous quadcopters, though. For MotherBox, Ivy League engineers started a crowdfunding campaign instead of writing a paper or selling the idea to an established company. It may not be time to buy a phone case so you can charge your phone wirelessly at Starbucks, but at least people are working on the problem. This time around, some of the tech actually works.

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