**Per-unit system - Wikipedia**
https://en.wikipedia.org/wiki/Per-unit_system

In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other. This can be a pronounced advantage in power system analysis where large numbers of transformers may be encountered. Moreover, similar types of apparatus will h…

**DA:** 77 **PA:** 42 **MOZ Rank:** 84