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Write any four points that state how a traction transformer is different from ordinary transformer.

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Ans: 1) Specially designed to withstand severe operating conditions. 

2) Are required to have high short time peak capacity. 

3) Class A insulation , specially reinforced to withstand frequent short circuits. 

4) Can take overloads as- 50 % for 15 min , 100 % for 5 min , 120 % for instant 

5) Inpulse withstand voltage nearly 5 times higher 

6) To limit effect of SC impedance not less than 8.5 % for 10 MVA and 10 % for 12.5 MVA.

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