EMC / EMI / RFI in Medium Voltage 22kV Substation 1

[sdeo]

Appreciate previous experience in levels of EMI / RFI measured in 22kV indoor subsations, specifically in 22kV/433V, 2000kVA transformers. Two such transformers will be located in a switchroom within a hospital. Concern is EMI/RFI to medical instruments, computers etc.
Is a distribution transformer a significant contributor of EMI?. If not what would be the worst offender. Do Standards specify maximum levels?. What are possible low cost solutions (if any).

 

[DanDel]

Switchgear in general and transformers in particular are large producers of EM fields. Interference with medical equipment and/or computers is, however, rare. Most modern switchgear rooms have electronic monitoring equipment which works without problems. What specific situations do you have?

 

[jbartos]

Suggestion: Visit

http://www.federalpacific.com/university/kfactor/kfactor.html

for: Common-mode noise

https://www.ch.cutler-hammer.com/docs/Fred/apscpgh/htmL/550000/l1.PDF

for: TVSS that incorporates the EMI filters