The main idea of a per unit system is to absorb large differences in absolute values into base relationships. Thus, representations of elements in the system with per unit values become more uniform. A per-unit system provides units for power, voltage, current, impedance, and admittance. With the exception of impedance and admittance, any two ...

The per unit (PU or P.U.) method of calculation is often used as an aid in the analysis of electrical systems that operate at different voltage levels. The determination of per unit values is not the end objective of a study.

标幺制（per unit）电路计算中各物理量和参数均以其有名值与基准值的比值表示的无量纲体制。 例如物理量A，有其相应基准值AB，则A的标幺值A*=A/AB。 电力系统分析与计算采用标幺制，便于直观和迅速地判断系统元件参数、状态变量的正确性，并能大量简化计算。

The per unit system or value of any quantity is defined as the ratio of actual value in any unit and the base or reference value in the same unit.

2022年5月22日 · Strictly speaking, per-unit systems are nothing more than normalizations of voltage, current, impedance and power. These normalizations of system parameters because they provide simplifications in many network calculations.

2020年11月16日 · The per-unit system is a method of expressing quantities in an electrical system (e.g. voltage, current, impedance, etc) as a proportion of pre-defined base quantities. By definition, the per-unit value of a quantity is the ratio of the original quantity to its base value (which results in a dimensionless "per-unit" or "pu" value):

Home / Resources (video trainings, theorems) / Knowledge / Per-unit System Formulas For each system parameter, per-unit value is equal to the actual value divided by a base value:

2024年12月23日 · 标幺值（per - unit value）是电力系统分析和工程计算中常用的一种相对值表示方法。 它是实际物理量（如电压、电流、阻抗等）与选定的基准物理量的比值。

Per Unit System – An Introduction Fundamental to any power system analysis is the know-how of per unit systems. This metric is widely used to describe voltages, currents, and impedances in a power system. This article, supplemented by an example, will explain step by step how to calculate these parameters for

What Is the Per-Unit System? The per-unit system is widely used in the power system industry to express values of voltages, currents, powers, and impedances of various power equipment. It is typically used for transformers and AC machines.