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Transformer Field of influence

Transformer Field of influence

Transformer Field of influence

(OP)
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

RE: Transformer Field of influence

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

RE: Transformer Field of influence

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.  

RE: Transformer Field of influence

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.

RE: Transformer Field of influence

(OP)
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.

 

RE: Transformer Field of influence

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

RE: Transformer Field of influence

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
 

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