JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power systems - II

Course Objectives:

• To understand the basic concepts of EHV AC transmission.
• To get the Knowledge on EHV transmission line inductance and capacitance
• To understand the voltage gradients of conductor
• To identify corona effects on transmission lines
• To calculate electrostatic fields of EHV AC lines and its effects
• To Analyze travelling waves
• To distinguish various compensators for voltage control

Course Outcomes

After completion of this course, the student will be able to:

• Understand the basic concepts of EHV AC transmission.
• Get the Knowledge on EHV transmission line inductance and capacitance
• Understand the voltage gradients of conductor
• Identify corona effects on transmission lines
• Calculate electrostatic fields of EHVAC lines and its effects
• Analyze travelling waves
• Distinguish various compensators for voltage control

UNIT - I

Preliminaries: Necessity of EHV AC transmission – advantages and problems–power handling capacity and line losses- mechanical considerations – resistance of conductors – properties of bundled conductors – bundle spacing and bundle radius- Examples.

UNIT - II

Line and Ground Reactive Parameters: Line inductance and capacitances – sequence inductances and capacitances – modes of propagation – ground return - Examples Voltage Gradients of Conductors: Electrostatics – field of sphere gap – field of line changes and properties – charge – potential relations for multi-conductors – surface voltage gradient on conductors – distribution of voltage gradient on sub-conductors of bundle – Examples.

UNIT - III

Corona Effects – I: Power loss and audible noise (AN) – corona loss formulae – charge voltage diagram – generation, characteristics - limits and measurements of AN – relation between 1-phase and 3-phase AN levels – Examples. Corona Effects – II: Radio interference (RI) - corona pulses generation, properties, limits – frequency spectrum – modes of propagation – excitation function – measurement of RI, RIV and excitation functions – Examples.

R16 B.TECH EEE.

UNIT - IV

Electro Static Field: Electrostatic field: calculation of electrostatic field of EHV/AC lines – effect on humans, animals and plants – electrostatic induction in unenergised circuit of double-circuit line – electromagnetic interference-Examples. Traveling Wave Theory: Traveling wave expression and solution- source of excitation- terminal conditions- open circuited and short-circuited end- reflection and refraction coefficients-Lumped parameters of distributed lines-generalized constants-No load voltage conditions and charging current.

UNIT - V

Line Compensation: Power circle diagram and its use – voltage control using synchronous condensers – cascade connection of shunt and series compensation – sub synchronous resonance in series capacitor – compensated lines – static VAR compensating system.

TEXT BOOKS:

• 1. “R. D. Begamudre”, EHVAC Transmission Engineering, New Age International (p) Ltd., 3rd Edition 2006.
• 2. S. Rao, HVAC and DC Transmission, Khanna Publishers, 3rd Edition 2001.

REFERENCE BOOKS:

• 1. “E. Kuffel, W. S. Zaengl, J. Kuffel”, High Voltage Engineering Fundamentals, Elsevier, 3rd Edition 2016.
• 2. “Mazen Abdel-salam, Hussein Ains, Abdab EI – Mors hedy and Roshdy Radwan”, High Voltage Engineering: Theory and Practice, CRC Press, 2nd Edition 2000.
• 3. “Hugh M. Ryan”, High Voltage Engineering and Testing, IEE power and energy series 32, The Institution of Engineering and Technology 2nd edition 2001. R16 B.TECH EEE.