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Overview
The per unit system is based on the formula shown in the equation shown below:
per unit = actual quantity divided by base quantity
Using this method, all quantities are expressed as ratios of some base value or values. In many respects the method is similar to the use of percentage values. When analyzing a real system, all parameters such as voltage, current, power, and impedance can be converted to per unit. If the bases are chosen wisely, the entire system may then be analyzed and the local results calculated.
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