Per Unit Analysis; Single and 3-Phase Systems

Per-phase analysis is the reduction of a balanced three-phase system to single-phase quantities to simplify electrical system calculations. Performing calculations on complex three-phase systems is a challenging and time-consuming activity. To make computations easier, you will be taught how to convert a three-phase system to a single-phase circuit, perform calculations and convert the circuit back to the original three-phase system. The per-unit analysis is a tool that is used in the simplification process of power system analysis. It involves removing transformers and expressing system quantities as fractions of a defined base unit quantity. You will be shown how to assign arbitrary base values to different system variables to easily perform per unit analysis with a step-by-step approach called the normalization process. You will also be taught different characteristics of a three-phase system and how it is related to a single-phase system. Having learned this, you will gain an understanding of how to calculate apparent power in single-phase circuits and establish a relation between apparent power in single-phase and three-phase circuits.

Three-phase transformers can be connected together in four different ways, having different voltage behavior at the high and low sides of the transformers. You will be taught the four transformer configurations, their workings, the behavior of voltage and the relationship of currents and voltages in different transformer connections. You will be shown how to represent a three-phase transformer as a single-phase transformer graphically to make the circuit analysis simpler and more understandable. Generators come with pre-defined base values of voltages, power and impedances from the manufacturer. You will see how to assign new values to these quantities and calculate the actual impedance from the base values. Per unit analysis, in theory, appears easier than actually performing per unit analysis on a complex power system. To elaborate further on the PU analysis on complex electrical systems, you will be taught how to break down complex systems into simple circuits and perform calculations with the help of solved examples.

This course is designed for electrical engineering students and professionals working in the power sector to sharpen their knowledge and skills in the area of per-unit analysis of single and three-phase systems. It contains lectures with industry-oriented knowledge aided by colorful graphics, schematic diagrams and resolved problems to grasp the attention of learners and maximize understanding of complex electrical systems. This course is also useful for people who studied electrical engineering and can serve as a refresher course for their current job designations. Basic knowledge of the laws and theorems related to three-phase electrical power systems is required. The power industry is a booming field and everyone is dependent on electricity in carrying out their routine activities. The industry offers jobs to a number of people living in any part of the world and requires system analysis skills from the employees. Grab the opportunity to build and improve your per-unit system analysis skills today!