A 2000/1000/500 three winding transformer is to be used as auto transformer with supply of 3000V. Two loads of 1050 kVA at 3500 V and other one at 180 kVA at 1000 V. The total kVA supplied will be
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The two specified loads are 1050 kVA and 180 kVA. The total apparent power supplied to the loads is therefore 1050 + 180 = 1230 kVA, matching option A.
Formula / Key Relation
Stotal = S₁ + S₂
= 1050 + 180
= 1230 kVA
Detailed Explanation
Concept & ReasoningThe question supplies two simultaneous load ratings connected to different voltage points of a three-winding transformer used in an autotransformer arrangement. When asked for total kVA supplied, apparent powers of the loads are added (assuming the ratings represent simultaneous delivered apparent power). The internal conductive/transformative kVA split is relevant to winding rating and copper economy, but it does not change the total external load kVA delivered.How to Solve It in the ExamExternal total kVA = sum of simultaneous load kVA values.Important Exam PointDo not confuse autotransformer transformed kVA with total load kVA.Related Revision PathThis question sits in the…
Concept & Reasoning
The question supplies two simultaneous load ratings connected to different voltage points of a three-winding transformer used in an autotransformer arrangement. When asked for total kVA supplied, apparent powers of the loads are added (assuming the ratings represent simultaneous delivered apparent power). The internal conductive/transformative kVA split is relevant to winding rating and copper economy, but it does not change the total external load kVA delivered.
How to Solve It in the Exam
External total kVA = sum of simultaneous load kVA values.
Important Exam Point
Do not confuse autotransformer transformed kVA with total load kVA.
Related Revision Path
This question sits in the revision path Electrical Machines → Transformers → Autotransformer Applications .
Quick Trick
External total kVA = sum of simultaneous load kVA values.
Common Mistake
Applying voltage ratios unnecessarily can obscure the direct load-sum requested.
Exam Tip
Do not confuse autotransformer transformed kVA with total load kVA.
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