In the early stages of electric power development, the supply systems were small and their operation was simple. As the demand for electrical energy increased, the power systems also expanded. Many of the large systems in turn were interconnected in order to derive the various technical and economic advantages inherent in the co-ordinated operation of power systems. It is now the established practice in every country to unify the power systems and operate them to mutual benefit.
KeywordsPower System Grid System Power System Operation High Voltage Transmission Line Constituent State
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