Steady-state voltage drop across a 3-phase cable run: ΔU = √3·I·L·(R·cos φ + X·sin φ).
Formula
$$ \Delta U = \sqrt{3} \cdot I \cdot L \cdot (R \cos\varphi + X \sin\varphi) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $I$ | Line current | A | load |
| $L$ | Cable one-way length | km (m/1000) | layout |
| $R, X$ | Resistance and reactance per km | Ω/km | IEC 60092-352 table |
| $cos φ$ | Power factor | - | load |
| $ΔU$ | Voltage drop line-line | V | result |
Sources
- IEC 60092-352 - Shipboard cable installation.