Define symmetrical components.

The symmetrical components method breaks down the unbalanced system into three sets of balanced components, known as positive sequence, negative sequence, and zero sequence components. These components are mathematically derived from the original unbalanced quantities, making it easier to analyze and solve complex problems. Each set of components can be treated independently, and once the analysis is complete, the results can be combined to obtain the overall solution for the unbalanced system.

Positive Sequence Components: These components represent a balanced set of phasors that have the same magnitude and rotate in the same direction as the original unbalanced phasors. They are denoted by the subscript "1" and are used to represent the desired, balanced behavior of the system.

Negative Sequence Components: These components represent another balanced set of phasors that have the same magnitude as the original unbalanced phasors but rotate in the