Course Details

Subject {L-T-P / C} : EE6247 : EHVAC and HVDC Power Transmission Systems {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Subrata Karmakar


Overview: Comparison of EHV AC and DC transmission, DC transmission systems, modern trends in AC and DC transmission. Overhead Transmission Line Parameter and Insulators: Bundled conductors, Resistance, Inductance and capacitance calculations of EHV line, Computation of surface voltage gradient on conductors, Insulator performance in polluted environments, mitigation of pollution induced flashover. High Voltage Cable Transmission: Underground cables and gas insulated Transmission Line, HV Substation (AIS and GIS), Advantages and Problems Corona: Power loss due to corona, Radio noise and Audible noise and their measurement as well as computation. Lightning Phenomena and its effects on Transmission Line: Lightning Strokes to Lines and its mechanism, Lightning Arresters and Protective Characteristics, Insulation Coordination, Shielding of TL. Travelling Wave Theory: Travelling Waves at Power Frequency, Reflection and Refraction of Travelling Waves, Transient Response with Series & Shunt Lumped Parameters, Principles of Travelling-Wave, Lighting and Switching over voltage protection. Grounding of transmission towers and substations.
HVDC System: Converter configurations and their characteristics, DC link control, converter control characteristics Monopolar operation, converter with and without overlap, smoothing reactors, transients in DC line, converter faults and protection, HVDC Breakers. Harmonic Filters: design of AC filters, DC filters. Power flow analysis in AC/DC systems: Component models, solution of DC load flow, , Parallel operation of HVDC/AC systems, Multi terminal systems.

Course Objectives

  1. To understand the basic concepts of EHV AC and HVDC transmission.

Course Outcomes

1. Learn the basic concepts of EHV AC and HVDC transmission.
2. To identify the electrical requirements for HVDC lines.
3. To identify the components used in AC to DC conversion.
4. To understand the operation of HVDC conversion technology.
5. To understand the fundamental requirements of HVDC transmission line design.
6. Students can analyze travelling waves
7. Students will understand the effects of corona like Audible noise.
8. To identify factors affecting AC-DC transmission.

Essential Reading

  1. M. G. Dwek, EHV Transmission, Elsevier Sc., , 1991
  2. J. Arrilaga, High Voltage Direct Current Transmission, peter pereginver Ltd.London, U.K. , 1998

Supplementary Reading

  1. E.W. Kimbark, Direct Current Transmission-vol.1, Wiley Inter science, New York , 1971
  2. K.R. Padiyar, HVDC Transmission Systems, Wiley Eastern Ltd., New Delhi , 1992