Power can not store like water and gas. So power has to generate according to the demand. Power generation sense the load demand by falling frequency. We can not always direct power in a specific path, because current always follows the path of least resistance. This means power transmission and distribution has to be monitor and control through out the day. Smart grid is the solution for the most of the problem in the power control and motoring. From power generation to the power consumption transformers steps voltage up and down to efficiently deliver power to the customer. Mainly electric grid consist of power genration, power transmission and power distribution. Substations transforms voltage from high to low or reverse. Electrical power may flow through several substations form power generation plant to the consumer.
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