Double Circuit Transmission Line Inductance Calculator

Double Circuit Transmission Line Inductance Calculator

This calculator estimates the total inductance of a double circuit transmission line using: $$ L’ = 2\times10^{-7}\ln\!\left(\frac{D_{\text{eff}}}{r}\right) \quad \text{(H/m)} $$ and $$ L_{\text{total}} = L’ \times L_{\text{line}} $$

* Enter the effective spacing \( D_{\text{eff}} \) (mm), the conductor GMR \( r \) (mm), and the line length (km).

Step 1: Enter Parameters

e.g., 300 mm

e.g., 10 mm

e.g., 50 km

Formulas:
Per-unit-length inductance: $$ L’ = 2\times10^{-7}\ln\!\left(\frac{D_{\text{eff}}}{r}\right) \quad \text{(H/m)} $$
Total inductance: $$ L_{\text{total}} = L’ \times L_{\text{line}} $$