Asymmetrical Transposed Three Phase Transmission Line Inductance Calculator

Asymmetrical Transposed Three Phase Transmission Line Inductance Calculator

This calculator estimates the per‑unit‑length inductance using: $$ L’ = 2 \times 10^{-7}\ln\!\left(\frac{D_m}{r’}\right) \quad\text{(H/m)} $$ with total inductance: $$ L_{\text{total}} = L’ \times L_{\text{line}} $$

* Input the line length (km), the three inter‑conductor distances (mm), and the conductor GMR (mm). Distances are converted to meters.

Step 1: Enter Parameters

e.g., 50 km

e.g., 300 mm

e.g., 350 mm

e.g., 400 mm

e.g., 10 mm

Formulas:
Geometric Mean Distance: $$ D_m = \sqrt[3]{D_{12}\,D_{23}\,D_{31}} $$
Inductance per unit length: $$ L’ = 2\times10^{-7}\ln\!\left(\frac{D_m}{r’}\right) \quad\text{(H/m)} $$
Total inductance: $$ L_{\text{total}} = L’ \times L_{\text{line}} $$