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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Oct 25, 2012 12:55 am Post subject: LCD video walls and massive transformers |
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Hey Mac, this one's for you. Have a buddy that works at a consulting firm. They have been hired to design a room with an LCD video wall in it, LED TVs actually. Brand new in the box.
They are on a wall that's up against an elecrtical room, with 25Kv to 600V stepdown transformers in it, 2 of them I believe, at a few KvA. There's also additional 600V to 220/110 volt stepdown txfs. They are within 10' of the video wall back, with a steel stud/drywall wall between them.
Any issues of RFI from the transformers affecting the TVs?
Thanks!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Oct 25, 2012 1:30 am Post subject: |
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You know, it's hard to say. Part says probably not but another part says well maybe. I would suggest they take a compass to the site and see how it reacts near the wall. Maybe not to see if it points to M north but just to see if it changes as moving it around the wall and how much. The M field may not be that large even with these high voltages.
I'm surprised they have these transformers this close to an adjoining room of this type.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Dec 28, 2012 10:14 am Post subject: |
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Sorry im late to reply here, but if they put some metal sheets up on the walls, there shouldnt be any issue with magnetic fields at all, tin sheeting should adequately shield the magnetic fields, and given their location, id expect they wouldve tin sheeted the walls behind the fibre cement sheeting when they built the room. Id expect this room would require some sort of fire rating to prevent the spread of fire to adjoining rooms.
The magnetic field strength will be directly proportional with the current flow, id expect though that they would be a few hundred KVA.
Id also be more concerned about the low voltage sub mains leaving the room ( if any ), and in particular how they are arranged. If the 3 phases are in a trefoil arrangement, the magnetic fields should mostly cancel each other out. If they are laid flat, side by side, 3 abreast, anything like that, and there will quite likely be interference.
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zaphod
Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale
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| Posted: Fri Dec 28, 2012 6:17 pm Post subject: |
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there is - or at least was back in the 90's - drywall for hospital OR rooms that were shielded. My memory says lead lined, but that can't be correct.
ran across this drywall when we needed a shielded room where i worked. they eneded up installing a copper Faraday cage for the equipment.
_________________
walk gently. leave a good impression.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Dec 28, 2012 9:15 pm Post subject: |
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Lead is abit extreme  Be handy to hide from nuclear radiation too!!
Had an issue with it here in the building i maintain a number of years back when we installed a new main switch board and the old main switch board become a sub board, the contractors that ran the sub mains put them flat in the cable tray, all the poker machine CRTs looked like they were being constantly degaused. Sheeted ubove the cable tray with tin sheeting, no issue after that.
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