I have a transformer 3phase 11kv/410v and its name plate missing. now how can I judge its rated kva?
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Answer Posted / koti1965
Measure size of 11 KV winding wire ( near HV Bushing or tap changer0 and find out current by using a current density of 3 A/Sq.mm and then KVA.
Ex : HV Conductor Size = 60 Sq.mm i.e I1=180 A So KVA = 3500
and cross check with LV conductor size which will be
1650 Sq.mm.
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