Electrical Engineering MCQ on Power Transmission
Conductors used in high tension over-head transmission lines are:
- Stranded
- Solid
- Any of above
- None of these
Correct answer: 1. Stranded
Explanation:
Solid wires are only used in rare cases when area of X-section is trivial (smaller). Application of solid wires for larger X-section and longer spans in impractical. Since it would produce mechanical fatigue and they would fracture due to continuous vibrations and swinging of lines.
All conductors used for overhead transmission lines are preferably stranded in order to increase the flexibility.
The stranded construction involves one central wire and around this, successive layers of wires containing 6, 12, 18, 24 wires.