JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems

Course objectives:

• To identify the different aspects of Extra High Voltage AC and DC Transmission design and analysis
• To understand the importance of modern developments of EHV and UHV transmission systems.
• To demonstrate EHV AC transmission system components, protection and insulation level for over voltages.

Course Outcomes

After completion of the course, students will be able to:

• Understand the importance of EHV AC transmission
• Estimate choice of voltage for transmission, line losses and power handling capability of EHV Transmission.
• Analyze by applying the statistical procedures for line designs, scientific and engineering principles in power systems.

UNIT - I

E.H.V.A.C. Transmission line trends and preliminary aspect standard transmission voltages, Estimation at line and ground parameters, Bundled conductor systems, Inductance and Capacitance of E.H.V. lines, Positive, negative and zero sequence impedance, Line Parameters for Modes of Propagation.

UNIT - II

Electrostatic field and voltage gradients, Calculation of electrostatic field of AC lines, Effect of high electrostatic field on biological organisms and human beings, Surface voltage gradients and maximum gradients of actual transmission lines, Voltage gradients on sub conductor.

UNIT - III

Electrostatic induction in unenergized lines, Measurement of field and voltage gradients for three phase single and double circuit lines, Unenergized lines. Power Frequency Voltage control and over-voltages in EHV lines: No load voltage, charging currents at power frequency, Voltage control, Shunt and series compensation, Static VAR compensation.

UNIT - IV

Corona in E.H.V. lines, Corona loss formulae, Attention of traveling waves due to Corona, Audio noise due to Corona and its generation, Characteristic and limits. Measurement of audio noise radio interference due to Corona, Properties of radio noise, Frequency spectrum of RI fields, Measurement of RI and RIV.

UNIT - V

Design of EHV lines based on steady state and transient limits, EHV cables and their characteristics.

TEXTBOOKS:

• 1. R. D. Begamudre, “EHVAC Transmission Engineering, New Age International (p) Ltd., 3rd Edition.
• 2. K.R. Padiyar, “HVDC Power Transmission Systems”, New Age International (p) Ltd., 2nd revised Edition, 2012.

REFERENCES:

• 1. S. Rao, “EHVAC and HVDC Transmission Engineering Practice”, Khanna Publishers.
• 2. Arrillaga. J, “High Voltage Direct Current Transmission”, 2nd edition (London) Peter Peregrines, IEE, 1998.
• 3. Padiyar.K.R, “FACTS Controllers in Power Transmission and Distribution”, New Age International Publishers, 2007.
• 4. Hingorani. H.G and Gyugyi. L, “Understanding FACTS- Concepts and Technology of Flexible AC Transmission Systems”, New York, IEEE Press, 2000. M. Tech – II Semester L T P C 3 0 0 3