Power System Study Guide For Electrical Students For Exam

Power Systems Study Guide (Core Subject - Electrical Engineering) 1. Introduction to Power Systems A power system is a network that generates, transmits, distributes, and utilizes electrical energy. It is one of the most important core subjects in Electrical Engineering because it deals with large-scale electricity supply to industries, homes, and infrastructure. A modern power system has three main parts: 1. Generation 2. Transmission 3. Distribution 2. Power Generation Electricity is produced in generating stations using different energy sources. 2.1 Thermal Power Plant Uses coal, gas, or oil. Steam rotates a turbine connected to an alternator. High pollution but widely used. 2.2 Hydroelectric Power Plant Uses water stored in dams. Water rotates turbine. Renewable and clean. 2.3 Nuclear Power Plant Uses nuclear fission. Very high energy output. Requires strict safety. 2.4 Renewable Energy Sources Solar Wind Biomass Tidal These are increasingly important for sustainable development. 3. Transmission of Electrical Power After generation (usually at 11-25 kV), voltage is stepped up using transformers for efficient transmission. Why High Voltage? [ P = VI ] For constant power: If voltage increases current decreases Power loss: [ P_{loss} = I^2R ] Lower current lower losses. Transmission voltages: 132 kV 220 kV 400 kV