Question

Which of the following statements are true?

a. In overhead lines, inductance is more predominant whereas capacitance is in the cable.

b. In overhead lines, capacitance is more predominant whereas inductance is in the cable.

c. Cost of cable is high compared to the overhead lines.

d. Cost of cable is low compared to overhead lines

1. A and c are true
2. A and b are true
3. B and c are true
4. C and d are true

Answer 1

Correct Answer - Option 1 : A and c are true

• The greater the spacing between the phases of a transmission line, the greater the inductance of the line.
• Since, the phases of a high-voltage overhead transmission line must be spaced further apart to ensure proper insulation, a high-voltage line will have a higher inductance than a low-voltage line.
• Since the spacing between lines is buried cables is very small, series inductance of cables is much smaller than the inductance of overhead lines.
• Also, the cost of cable is high compared to the overhead lines as the cables have insulation as they are installed underground.