Course Details

Subject {L-T-P / C} : EE6205 : Extra High Voltage Transmission {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Subrata Karmakar


Introduction to EHV AC Transmission: Role of EHV AC Transmission, Brief Description of Energy Sources, Transmission Line Trends and Preliminaries: Standard Transmission Voltages, Average Values of Line Parameters, Power-Handling Capacity and Line Loss, Mechanical Considerations in Line Performance, Calculation of Line and Ground Parameters: Resistance of Conductors, Current-Carrying Capacity, Properties of Bundled Conductors, Inductance of EHV Line Configurations, Line Capacitance Calculation, Sequence Inductances and Capacitances, Resistance and Inductance of Ground Return, Voltage Gradients of Conductors: Electrostatics, Field of Sphere Gap, Charge-Potential Relations for Multi-Conductor lines, Surface Voltage Gradient on Conductors, Distribution of Voltage Gradient on Sub-conductors of Bundle, Design of Cylindrical Cages for Corona, Power-Frequency Voltage Control and Over voltages: Problems at Power Frequency, No-Load Voltage Conditions and Charging Current, Power Circle Diagram, Voltage Control Using Synchronous Condensers, Cascade Connection of Components—Shunt and Series Compensation, Capacitor Compensated Lines, Static Reactive Compensating Systems (Static VAR), High Phase Order Transmission. Extra High Voltage Cable Transmission: Electrical Characteristics of EHV Cables, Design of Cable Insulation, Tests on Cable Characteristics, Gas Insulated EHV Lines, EHV Testing and Laboratory Equipment: Standard Specifications, Impulse Voltage Generators: Generation of High Alternating Test Voltage, Generation of High Direct Voltages, and Measurement of High Voltages.

Course Objectives

  1. To learn about the recent trends in EHV AC Transmission.

Course Outcomes

1. Students learn about the trends in EHV AC Transmission.
2. Student can calculate Line inductance and capacitances of bundled conductors.
3. Students can calculate voltage gradient of bundled conductors
4. Students understand the effect of Radio Interference
5. Students can calculate electrostatic field of EHV AC lines
6. Students can analyze compensated devices for voltage control.

Essential Reading

  1. M. G. Dwek, EHV Transmission, Elsevier Sc., , 1991
  2. K.R. Padiya, HVDC transmission systems, Wiley Eastern Ltd. , New Delhi, 1992

Supplementary Reading

  1. J. P. Holtzhausen, W L Vosloo, High Voltage Engineering Practice and Theory, CRC Press, 2 edition , 2000
  2. Andrew R. Hilema, Insulation Coordination for Power Systems, CRC Press , 1999