The Purpose of Power System

• The main purpose of power system is to generate, transmit, and distribute electric energy to customers without interruptions and in the most economical and safe manner.
• To achieve these objectives, power systems are divided in generation, transformation, transmission and distribution subsystems. 
• Generation consists of converting energy from different forms, such as thermal, hydraulic, or nuclear, to electrical energy. Transformation consists of changing the voltage levels to those that are convenient for transmitting or distributing electrical energy. The role of transmission is to transport energy from generating stations to load centers, generally situated in geographically far away locations, where electrical energy is consumed. The distribution consists of supplying energy to consumers at a convenient voltage level.