Question

When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively _______.

• A. increase and decrease
• B. decrease and increase
• C. decrease and remain unaffected
• D. remain unaffected and increase

Hint:

Bundle conductors: ↓Inductance, ↑Capacitance → Better for EHV lines, less corona loss.

Answer 1

The Correct Option is B

Step 1: What are Bundle Conductors?
A bundled conductor consists of 2 or more sub-conductors spaced apart but electrically connected. Common in EHV transmission to control corona loss and reduce impedance.
Step 2: Effect on Inductance
Inductance depends on GMR (geometric mean radius). Bundling effectively increases the equivalent radius, reducing inductive reactance. Hence, inductance decreases.
Step 3: Effect on Capacitance
Capacitance is inversely related to spacing between conductors. Due to larger effective radius and smaller electric field strength near the conductor, capacitance increases.
Step 4: Additional Benefits of Bundling
- Reduces corona loss
- Minimizes voltage gradient
- Reduces audible noise and radio interference
Conclusion:
Option (2) is correct: Bundling decreases inductance and increases capacitance, which improves power transfer.