Required transformer kVA rating given 3-phase secondary load, voltage, power-factor and 20 % safety margin.
Formula
$$ S = \frac{P}{\cos\varphi} \cdot (1 + m) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P$ | Active load | kW | load list |
| $\cos\varphi$ | Power factor | - | load characteristics |
| $m$ | Design margin | - | spec requirement |
Sources
- IEC 60076 / IEC 60092-302.