JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems

Course objectives: to prepare the students to

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

Course Outcomes

Upon the completion of this course, the student will be able to

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

UNIT - I

Extra high voltage (EHV) AC. Transmission line trends and preliminary aspect standard transmission voltages – Estimation at line and ground parameters-Bundle conductor systems-Inductance and Capacitance of EHV lines – positive, negative and zero sequence impedance – Line Parameters for Modes of Propagation.

UNIT - II

Electrostatic field and voltage gradients – calculations 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 EHV lines – Corona loss formulae- attention of traveling waves due to Corona – Audio noise due to Corona, its generation, characteristic and limits. Measurements of audio noise radio interference due to Corona - properties of radio noise – frequency spectrum of RI fields – Measurements of RI and RIV.

UNIT - V

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

TEXT BOOKS:

• 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. R19 M. TECH. EPE/EPS

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.
• 5. Advances in UHV Transmission and Distribution, online course https://www.youtube.com/channel/UCWKPXSjLRz-TAFgFWCfMmGg/videos R19 M. TECH. EPE/EPS M. TECH. I Year II Sem. (EPE/EPS)