General > General Technical Chat
Request for knowledge - Troubles at home
<< < (15/18) > >>
pcprogrammer:
It might depend on the amount of power being drawn, but we have a barn with solar panels nearby, which is connected via a transformer system (Big green cabinet with death warnings on it) to high tension lines. When I walk by I can hear the transformer (within a meter or three of the cabinet) but I can't feel any tremors in the ground when I walk on where the cables are in the ground.

So either a lot of current is running through the cables and they move so much that you can feel them or you are very very sensitive.

The smaller pole mounted transformers will probably make some noise but I don't hear the one that is next to our neighbors house, and I have sensitive ears.
tom66:
I suspect any motion in the underground cables is damped by the earth's mass pretty quickly.

Exceptions would apply if they run close to structural members, for instance if a transformer pad was on the same pad as your building foundation.  I think that would be pretty odd, but some larger apartment complexes have their own mini substation/transformer inside them for residences.   And, in busy/dense urban areas they tend to build substations into similar looking properties, e.g. there are some of these in London that hide infrastructure for the Underground.

I think it's important to make measurements of any noise before assuming this is the cause though.  I'm still reasonably convinced this is psychosomatic -- that doesn't make it any less real to you but it means you won't fix it with a physical change unfortunately.
lxmute:
Yes, it's a good point.
I'm currently reading a paper made by an acoustic office, a study for a nearby 65kV transformer in NE France. It's very complete and professional acoustic paper. I can't do that on my own.
« There is a time when you need to call for experts ».
I will spend more bucks, hiring such dedicated experts in noise measures. I'll keep you informed in the following months if curious about my case.


--- Quote ---or you are very very sensitive.
--- End quote ---
let's have some fun, ex-wife told me I was way too much insensitive  ^-^
EEVblog:

--- Quote from: nctnico on July 02, 2022, 12:50:00 pm ---
--- Quote from: EEVblog on July 02, 2022, 09:19:55 am ---
--- Quote from: lxmute on July 02, 2022, 07:31:07 am ---Hello,
Your replies where helpful to bring me back to the "sound aspect" problem.
Requesting help from a specialist in EMI and its derivatives, I've been led to the problem of Infrasounds generated by harmonics inducted by high power + high frequencies (moderated since in 90kHz range) at a low frequency range on unshielded city grid cables.

--- End quote ---

Err, how do the city power cable induce low frequency sound? What is the physical mechanism?
Sorry to tell you, but it sounds like you have been peddled some BS  :bullshit:

--- End quote ---
Pass enough current through a cable and it will start to move due to the magnetic field. Lookup some videos about arc melting furnaces. You can see the cables dance around. The same can be seen from cables going to spot welders. Heck, I even managed to make test leads move on my desk by discharging a capacitor bank causing a 1kA current spike. All in all it is possible that cables move or vibrate.

--- End quote ---

Yeah but he's talking about "unshielded city grid cables".
Are we supposed to seriously believe the "city grid cables" are physically vibrating and causing this guys sleep problems? Really? Nope, sorry, it's BS.
EEVblog:

--- Quote from: lxmute on July 03, 2022, 11:57:29 pm ---I will spend more bucks, hiring such dedicated experts in noise measures. I'll keep you informed in the following months if curious about my case.
--- End quote ---

Use you money to see a sleep medical specialist.
And like I said, start by buying a good well designed pillow.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod