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A discussion of the philosophy of modeling of three-phase transmission lines, three-phase transformers, three-phase generators, and power system loads is presented. Although the topic is very basic, the material covered is not all conventional. Single-phase representation of a three-phase power system is discussed in detail. Assumptions usually employed in the power industry are stated. Also discussed is the mathematical representation of a non-symmetrical three-phase power system in which the symmetrical-component method is not applied. An important aspect is the study of the models used in present-day problems as well as the models that may be required in the near future.