transformer radiation

[VirgilJ]

I'm building a moly glass furnace that requires a 40kva transformer. The transformer might need to be inside my building.
How do I determine emf...radiation levels from the transformer and the safety protocols...distance from, shielding, etc.
Thanks,Virgil

 

[Zogzog]

Why? A unit that small in an enclosure would be so minor.

 

[VirgilJ]

It will be in a metal skin with lost of "square mesh" as the front and back of the unit. Is there a way of determining the radiation levels?

 

[davidbeach]

Radiation? I'd worry far more about shielding against the acoustic emissions.

 

[Skogsgurra]

Yes. There are many ways to determine 'radiation' levels.

A calibrated antenna plus a calibrated receiver/spectrum analyzer for HF radiation and a triaxial VLF meter for low frequency magnetic fields. Hire an EMC consultant to do the measurements if you do don have the necessary knowledge.

Why do you bother? Are there sensitive equpment nearby? If it is about animals or humans, you can forget about any problems. Any transformer made with modern methods have neglible magnetic leakage even without any encapsulation.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[electricpete]

Is this an arc type furnace?
If it is,then of course the high frequency content of magnetic field from transformer/cables will be higher than for a transformer feeding a sinusoidal load. But whether it will be a problem, beats me.

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(2B)+(2B)' ?

 

[dicer]

As long as the wires in and out are in metal conduit, and the transformer is in a metal enclosure and grounded all should be fine. If it were microwave then small openings in the enclosure would be a concern.

 

[ScottyUK]

Well, the metal case and conduit would be a good electrostatic screen, but since most of a transformer's external radiation results from magnetic fields it is bordering on useless. If you had a supply of mu-metal for conduit and casing then perhaps it would be valid, but not with steel or aluminium. The most economical method of reducing the field strength is usually separation: field drops with the square of distance.


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