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Chapter 3.1 - Electrical Systems

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1. Electrical Systems 1. ELECTRICAL SYSTEM Syllabus Electrical system: Electricity billing, Electrical load management and maximum demand control, Power factor improvement and its benefit, Selection and location of capacitors, Performance assessment of PF capacitors, Distribution and transformer losses. 1.1 Introduction to Electric Power Supply Systems Electric power supply system in a country comprises of generating units that produce electricity; high voltage transmission lines that transport electricity over long distances; distribution lines that deliver the electricity to consumers; substations that connect the pieces to each other; and energy control centers to coordinate the operation of the components. The Figure 1.1 shows a simple electric supply system with transmission and distribution network and linkages from electricity sources to end-user. Figure 1.1 Typical Electric Power Supply Systems Power Generation Plant The fossil fuels such as coal, oil and natural gas, nuclear energy, and falling water (hydel) are commonly used energy sources in the power generating plant. A wide and growing variety of unconventional generation technologies and fuels have also been developed, including cogeneration, solar energy, wind generators, and waste materials. About 70 % of power generating capacity in India is from coal based thermal power plants. The principle of coal-fired power generation plant is shown in Figure 1.2. Bureau of Energy Efficiency 1

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