Question

What is the formula for width of the tank for single phase transformers used?

(a) width of tank = 2*distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank

(b) width of tank = distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank

(c) width of tank = 2*distance between adjacent limbs * external diameter of h.v windings + 2*clearance between h.v windings and tank

(d) width of tank = distance between adjacent limbs * external diameter of h.v windings + 2*clearance between h.v windings and tank

The question was asked in homework.

Query is from Methods of Cooling of Transformers in division Design of Transformers of Design of Electrical Machines

Answer 1

Right answer is (b) width of tank = distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank

Easiest explanation: Width of tank = 2*distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank is the formula for three phase transformer. For single phase transformers, the distance between adjacent limbs is not multiplied.