JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems -II

Course objectives:

• To identify the different aspects of Extra High Voltage A.C and D.C Transmission design and Analysis
• To understand the importance of modern developments of E.H.V and U.H.V transmission systems.
• To demonstrate EHV ac transmission system components, protection and insulation level for over voltages.

Course Outcomes

Upon the completion of the subject, the student will be able to

• List the necessity of EHV AC transmission, choice of voltage for transmission, line losses and power handling capability.
• Estimate the Statistical procedures for line designs, scientific and engineering principles in power systems.
• Construct commercial transmission system.

UNIT - I

E.H.V.A.C. Transmission line trends and preliminary aspect standard transmission voltages – Estimation at line and ground parameters-Bundle 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 – 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 – un energized 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, 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:

rd

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

REFERENCES:

• 1. S. Rao “EHVAC and HVDC Transmission Engg. 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 Int. Publishers, 2007.
• 4. Hingorani H G and Gyugyi. L “Understanding FACTS-Concepts and Technology of Flexible AC Transmission Systems” New York, IEEE Press, 2000.