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List four special features of traction transformer.

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

2. Have high short time peak capacity. 

3. Class A insulation specially reinforced to withstand stresses of frequent short circuits. 

4. Can take overloads as- 50 % for 15 min , 100 % for 5 min , 120 % for instantaneous 

5. Impulse withstand voltage nearly 5 times higher 

6. To limits the effect of SC , impedance not less than 8.5 % for 10 MVA and 10 % for 12.5 MVA. 

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