Transformer Field of influence

[buddy91082]

Hello there.

I am using cats resin type transformers (5kv primary - 208Y/120v secondary) and am looking for tables or graph that would show the emi sphere of influence from a distance "x" from transformers for a kVA size. I have looked at a few transformer manufacturers and they do not seem to have that information.

Thanks.
b

 

[davidbeach]

I've never seen such a thing, so you may be chasing wild geese.

 

[dpc]

I don't think you will find much. Never heard of this being an issue. The conductors in and out of the transformer will probably contribute much more EMI than the transformer itself.

 

[IvanDoe]

Hello,

For what do you need to know a level of emi? Properly electromagnetic field is concentrated in transformer core. There is a directive of electromagnetic compatibility for electric and electronic devices and installation rules which manufacturers recommend to use when you arrange an equipment.

 

[buddy91082]

The transformer is 50' away from a nano-tech clean room. We are concerened with magnetic field interference from the transformer to sensitive equipment within the clean room.

I have called several transformer manufacturers and it does not appear that this information is available.

 

[prc]

Magnetic field from the transformer can be from LV leads carrying heavy current and also from the leakage flux from the windings. The said transformer must be with a metalic cover and this will act as a magnetic shield as far as the magnetic field is concerned.What is the kVA of transformer? How the LV lead is taken out? Since your clean room is 50 feet away, I dont think the field will reach there.There are methods to measure such magnetic interference,I may be able to come with relevent IEC

 

[prc]

The following standards cover EMC( Electromagnetic compatibility) requirements for the referred issue:

1)IEc61000-6-4 (1997) EMC generic standard- Emission standard for industrial environments
2)IEC 61000-6-5(2001) EMC Generic stanandards-Immunity for power station and substation environments
3)IEC61000-4-8 Power frequency magnetic field immunity test