Question

For large power transformers rated more than$500kVA$, the winding resistances, which are small compared with the leakage reactances, can often be neglected.

(a) True

(b) False

Short answer

Therefore, the correct option is (b) False

Step-by-step solution

Define the formulas of power absorbed by winding.

Write the formula of power absorbed by transformer winding.

$P=I^2{R}_w$ ……. (1)

Here, $I$ is a current through winding and $R_w$ is the winding resistance.

Determine the current.

The rating of the given power transformer is$500kVA$, which is very high, so the transformer will also have a high value of current.

This, high current flows through the transformer windings and leads to the high power consumption across the winding resistance.

So, because of high power consumption of winding, it’s resistance cannot be neglected even if it has small ohmic value than the leakage reactance.

Therefore, option (b) False is correct.