Question

What is the formula to calculate the radial depth of low voltage windings?

(a) radial depth of the lv windings = number of layers * radial depth of the conductors * insulation between layers

(b) radial depth of the lv windings = number of layers * radial depth of the conductors – insulation between layers

(c) radial depth of the lv windings = number of layers / radial depth of the conductors + insulation between layers

(d) radial depth of the lv windings = number of layers * radial depth of the conductors + insulation between layers

I got this question during an interview.

I would like to ask this question from Overall Dimensions topic in section Design of Transformers of Design of Electrical Machines

Answer 1

Correct option is (d) radial depth of the lv windings = number of layers * radial depth of the conductors + insulation between layers

To explain I would say: The number of layers is first taken note of. Then the radial depth of the conductors is calculated along with the insulation between layers. On substituting the values in the above formula the radial depth of the low voltage windings is obtained.