###### Saturday, May 10, 2008

## Electrical Per-unit CalculationThe per-unit method of calculation in its basic concept is to develop a counterpart impedance or reactance network diagram of the power system involved and resolve these impedances down to a single impedance value through delta, wye, series, parallel conversion equations. While it is possible to do the calculation with the actual system ohmic values, it becomes very complex when several voltages levels are involve since ohmic values at different voltages are not directly compatible. With the aid of the per-unit mathematical technique, it has facilitated this difficulty. While the equivalent diagram and the per-unit mathematics are two separate fields, they usually are used together and referred to as the per-unit method of determining short circuit values. |

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