Q:

Determine the temperature rise ? T _h of a single-phase transformer provided V ₃ = 0.10 pu = 10%, T _amb = 40 C, and T _rated = 100 C. Assume k _avg = 0.90 and l _avg = 1.75.

Q:

Solution

The rated temperature rise is ? T _rated = T _rated ? T _amb = T _{rise rat} = 60 C. For the harmonic with order h = 3 and amplitude V ₃ = 0.10 pu ? 10%, one obtains (through linear extrapolation) the weighted-harmonic factor by replacing by 10:

resulting with Fig. 6.14 in the additional temperature increase due to the 3rd harmonic ? T _{h = 3} = 3.3% or ? T _{h =3} = 1.98 C.

Q:

Determine the temperature rise ? T _h of a single-phase induction motor provided V ₃ = 0.10 pu ? 10%, T _amb = 40 C, and T _rated = 100 C. Assume k _avg = 0.85 and l _avg = 1.40.

Transformers, induction machines, and universal machines have different...