What is the range of current density for large power transformer with self oil cooled type?(a) 1-2 A per mm^2(b) 1.5-2.5 A per mm^2(c) 2.2-3.2 A per mm^2(d) 2-3 A per mm^2The question was posed to me in a national level competition.Origin of the question is Design of Core and Winding in division Design of Transformers of Design of Electrical Machines

What is the range of current density for large power transformer with

1.	What is the range of current density for large power transformer with self oil cooled type?(a) 1-2 A per mm^2(b) 1.5-2.5 A per mm^2(c) 2.2-3.2 A per mm^2(d) 2-3 A per mm^2The question was posed to me in a national level competition.Origin of the question is Design of Core and Winding in division Design of Transformers of Design of Electrical Machines
Answer» The correct ANSWER is (c) 2.2-3.2 A per mm^2 The explanation is: For large transformers with self oil COOLED type, the highest permissible VALUE of CURRENT density is 3.2. The MINIMUM current density value required is 2.2.

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