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Mixing of neutral current for transformer

 
 
sujj
 
Reply Mon 2 Jun, 2014 04:08 am
Our client is replacing the 250kVA Transformers having Vector group Dd0 with 500kVA Transformers having Vector group YDN11

We wish to know whether there will be any impact of the Circulating currents in the Neutral (being introduced contrary to the existing Neutral isolated) while the step down and step up transformers are connected to the same earthing network. Furthermore, both the substations are powered up by 2000 kVA through Dynamic UPS which has a Coil.

We request your expert advise whether the existing system will affected in terms of Electrical parameters due to the foregoing.
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bahtah
 
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Reply Wed 4 Jun, 2014 12:48 am
@sujj,
Our client is replacing the 250kVA Transformers having Vector group Dd0 with 500kVA Transformers having Vector group YDN11

Should your new transformer vector group be Ydn11 (Wye-primary, Delta-secondary with a Neutral? I would suggest you speak with the engineers at the transformer mfg and let them know your application as they should be able to let you know if you are using the transformer for the correct application.
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