The power system is a network which consists generation, distribution and transmission system. It uses the form of energy (like coal and diesel) and converts it into electrical energy. The electrical power system consists of three major components: generation, a high voltage transmission grid, and a distribution system. The high voltage transmission system links the generators to substations, which supply power to the user through the distribution system. After electricity is generated, it must be transmitted and distributed to consumers. The network of transmission and distribution facilities makes up the power grid. Typically, electricity is transmitted at a very high voltage over the power lines that dot the countryside. The power plant of the generating substation is mainly classified into three types, i.e., thermal power plant, hydropower plant and nuclear power plant. The generator and the transformer are the main components of the generating station.