ELG4125 Transmission and Distribution Systems

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Presentation transcript:

ELG4125 Transmission and Distribution Systems Case Study 1 Power System Planning and Design of Power Plant, Transmission Lines, and Substations Based on Optimization of Electrical, Mechanical, Environmental, and Economic Factors

ELG4125: Case Study Consider a power station that delivers a transmission line with a voltage, Vs = 500 kV and current, Is of 1800 A at 60 Hz. The transmission line feeds a city that is 500 km away from the power station. A substation located 250 km away from the station is proposed to maintain the voltage at 120 kV as the minimum voltage delivered to the city, with a peak current, IR of 1600 A.

Midterm 1 Design the above system to meet current and future system requirements of load growth, taking into consideration the following: Draw the details of the entire power system. Power Plant: Include general specifications of generators and drivers including number of drive trains. Transmission Line Characteristics: Estimate the performance of the system in terms of efficiency and voltage regulation. Set up specifications for the transmission line in terms of conductors (resistance; inductance; capacitance); insulators; towers; line loadability, etc. Include appropriate figures for towers and insulators. Identify the three-phase line as single circuit or double circuit. You may use tables A.3 and A.4 from the textbook or other sources for the above reason. Generation, Transmission, and Distribution Substations: Include site selection, transformer power ratings, turns ratio, grounding; configurations, efficiency; components of each substation with specifications. Include figures where appropriate. HVDC: Conceptually, replace the AC transmission line with a DC line showing all the HVDC technologies in a separate figure. You may read the case study of Chapter 5, page 234 of the textbook.

Transmission Line Design Considerations Select a suitable conductor for the overhead transmission line: ACSR; AAAC; ACAR, or others. See Section 4.1 of the textbook. Select a suitable tower: number of circuits; number of conductors per phase; type and details of insulators; tower/line protection specifications; and characteristics of shield wires. See Table 4.1! Estimate the current that flows in each conductor. Based on this current, the size of the conductor can be estimated. Then use tables to find the parameters such as R, L, and C, then to find Z and Y. Build your transmission line model to find ABCD constants. Find Vs, Is, Vr, Ir of each section of the transmission line. Find the efficiency and voltage regulation.

Double- Circuit, Two-Wire Transmission Line