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This site provides tutorials on low voltage and medium voltage 3-phase circuit analysis. Among the topics demonstrated are current flows in load end circuit, delta and wye connected circuits and incoming utility supply sides.
Next is the calculation of symmetrical fault which is useful in determing interrupting or breaking capacity of circuit breaker. The kA rating is also required in calculating multiple pickup current which is then used to determine operating time of IDMT OCEF protective relay.
Performance of short, medium and long transmission lines are measured by calculating voltage regulation and line efficiency of circuit in question.
It is interesting and fun to do a complete analysis of electrical power circuit by representing parameters such as line impedance, voltage and current in phasor forms. As a matter of convenience, a single phase equivalent circuit is analyzed first ,the results of which can then be used to determine 3-phase circuit parameters.
Ir Mohd Sobri, P.E