Unit οι : Structure of Electrical Power Systems and tariff : Α) Structure of Electrical Power Systems : Structure of Electrical Power System, Different factors associated with generating stations such as Connected load, Maximum Demand, Demand Factor, average load. load factor, diversity factor, plant capacity factor, reserve capacity, plant use factor. Load curve. Ioad duration curve. concept of base Ioad and peak Ioad stations. Interconnected grid system. Fitting of available generating stations into the area Ioad duration curve. Β) Tariff : Introduction of Tariff, Tariff setting principles. desirable characteristics of Tariff, various consumer categories and implemented tariff such as two part. three part. Time of Day tariff for Η.Τ. & L.T. industrial and commercial consumers along with current electricity charges, Introduction to Availability Based Tariff (ΑΒΤ), Interruptible tariff. Incentives and penalties applied to various consumers. (Chapters - ι. 2) Unit 02: Major Electrical Equipment's ίπ Power Stations and Overhead line insulators : Α) Major Electrical Equipment's in Power Stations : Descriptive treatment of ratings of various equipment used in power station, Special features, field of use of equipment like alternators, necessity of exciters. various excitation systems such as dc excitation. ac excitation and static excitation systems. transformers. voltage regulators. bus-bars. current limiting reactors. circuit breakers, protective relays, current transformers, Potential transformers, Lightning arresters, Earthing switches, isolators, carrier current equipment (P.L.C.C.). Control panels, battery rooms, metering and other control room equipment ίη generating stations. Β) Overhead Line Insulators : Types of insulators & their applications such as pin type, suspension type, strain type, Silicon Rubber insulators, post insulators, Shackle insulators, bushings, voltage distribution along string of suspension insulators, string efficiency, equalization of potential across each unit, method of improving string efficiency, insulator failure. (Chapters - 3, 4) Unit 03 : Mechanical Design of Overhead Lines and Underground Cables : Α) Mechanical Design of Overhead Lines : Main components of overhead lines. Line supports. conductor spacing, Iength of span. calculation of sag for equal and unequal supports and effect of ice and wind Ioadings. Β) Underground Cables : Classification. Construction of cable. XLPE cables. insulation resistance. dielectric stress in single core cable. capacitance of single core and three core cable. cables used for HVDC transmission. Grading of cables, inter sheath grading, capacitance grading. (Chapters - 5, 6)
