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Electrical Engineering QUESTION #2162
Question 1
A 220 kV transmission line has surge impedance $Z_c = 250\,\Omega$. The Surge Impedance Loading (SIL) is:
  • $193.6\,\text{MW}$✔️
  • $96.8\,\text{MW}$
  • $387.2\,\text{MW}$
  • $484\,\text{MW}$
Correct Answer Explanation
$\text{SIL} = \frac{V_R^2}{Z_c} = \frac{(220 \times 10^3)^2}{250} = \frac{4.84 \times 10^{10}}{250} = 193.6\,\text{MW}$.