These normalized impedances are known as per unit impedances. To use the per unit method, we normalize all the system impedances (and admittances) within the network under consideration to a common base. By removing the impact of varying voltages, the necessary calculations are simplified. The per unit system of calculation is a method whereby system impedances and quantities are normalized across different voltage levels to a common base. Input Motor Sub-tansiant Impedance (X" in Per Unit) :Ĭalculation of Motor Impedance on a Different MVA and Voltage Base ![]() Per-Unit Impedance Calculation for Motors ![]() Input Base Line-to-Line Voltage (KV LL ): Input Capacitor Bank 3-Phase Rating ( KVAR): Input 3-Phase Short Circuit Current (kA):Ĭapacitor Bank Per-Unit Impedance - Given KVAR
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