An electric power system is a network of electrical components deployed to supply, transfer, and use electric power. Where sypply refers to the generation of power, transfer refers to transmission of power & the use refer to the distribution of power.
According to IEC 60050, Article no: 601-01-01, the defination of Electrical Power System is "All installation and plant provided for the purpose of generating, transmitting and distributing electricity is called Electrical Power System".
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