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 Transformer The high voltage is required for long distance transmission and, the low voltage is required for utility purposes. The voltage level is going on decreasing from the transmission system to the distribution system.The electrical energy is generated by the three-phase  synchronous generator  (alternators) as shown in the figure below. The generation voltage is usually 11kV and 33 KV. This voltage is too low for transmission over long distance. It is, therefore, stepped up to 132, 220, 400 KV, or more by step-up  transformers.  At that voltage, the electrical energy is transmitted to the bulk power substation where energy is supplied from several power substations. The voltage at these substations is stepped down to 66KV and fed to the sub-transmission system for onward transmission to the distribution sub-stations. These substations are located in the region of the load centres. The voltage is further stepped down to 33KV and 11KV. The large industrial consumers are supplied
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  Single Line Diagram of Power Supply System The electrical energy is produced at generating stations, and through the transmission network, it is transmitted to the consumers. Between the generating stations and the distribution stations, three different levels of voltage (transmission, sub-transmission and distribution level of voltage) are used. The high voltage is required for long-distance transmission and, the low voltage is required for utility purposes. The voltage level is going on decreasing from the transmission system to the distribution system. The electrical energy is generated by the three-phase  synchronous generator  (alternators) as shown in the figure below. The generation voltage is usually 11kV and 33 KV. This voltage is too low for transmission over a long distances. It is, therefore, stepped up to 132, 220, 400 KV, or more by step-up  transformers.  At that voltage, the electrical energy is transmitted to the bulk power substation where energy is supplied from se
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BASIC STRUCTURE OF POWER SYSTEM

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  Power System Definition:  The power system is a network which consists of generation, distribution and transmission systems. It uses the form of energy (like coal and diesel) and converts it into electrical energy. The power system includes the devices connected to the system like the  synchronous generator,   motor,   transformer,   circuit breaker , conductor, etc. The power plant, transformer, transmission line, substations, distribution line, and distribution transformer are the six main components of the power system. The power plant generates the power which is stepped up or step-down through the transformer for transmission. The  transmission line  transfers the power to the various substations. Through substation, the power is transferred to the distribution transformer which step-down the power to the appropriate value which is suitable for the consumers. Structure of Power System The power system is a complex enterprise that may be subdivided into the following sub-systems.
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