ABSTRACT
This chapter covers the theoretical basics for power system analysis and provides examples for voltage, power transfer, and short circuit studies. It shows balanced three-phase impedance which is converted to amps, and the inverse calculation. The formulas are basically three-phase versions of Ohm’s Law and are commonly used when performing studies. Ohmic values for cables and busways are typically given for one line or phase and correspondingly are equivalent to phase-to-neutral values or wye connections for three-phase short circuit analyses. The chapter also provides the lowest allowable phase-to-phase voltage ratio that can be applied without exceeding the continuous voltage rating of the motors. It illustrates the inductive reactance reduces because of the effect of annular current flow in the extra conducting material near the skin effect region or boundary that produces a counter flux resulting in a lowered self-flux opposition voltage. The chapter presents a procedure for calculating bus voltage drops for balanced loads.
