3Approximate Method of Analysis
A distribution feeder provides service to unbalanced three-phase, two-phase, and single-phase loads over untransposed three-phase, two-phase, and single-phase line segments. This combination leads to the three-phase line currents and the line voltages being unbalanced. To analyze these conditions as precisely as possible, it will be necessary to model all three phases of the feeder as accurately as possible. However, many times, only a “ballpark” answer is needed. When this is the case, some approximate methods of modeling and analysis can be employed. This chapter focuses on developing some of the approximate methods. Later chapters discuss the development of the exact models and analysis. By knowing the “ballpark” ...
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