E.H.V. Transmission and Corona Loss:
Need for EHV Transmission. Use of bundled conductors, corona characteristics of smooth
bundled conductors with different configurations, Corona loss. Factors affecting the corona
loss. Radio interference due to corona. Shunt and series compensation in EHV lines. Tuned
power lines. Insulation Co-ordination.
HVDC Transmission:
Advantages, disadvantages and economics of HVDC Transmission system. Types of D.C.
links, converter station equipment, their characteristics.
Insulating materials used in H..V. Engg.:
Applications of insulating materials used in power transformers rotating machines, circuit
breakers, cables, power capacitors.
Conduction and breakdown in Gases, Liquids & Solid Dielectrics:
Solids - Intrinsic, electromechanical and thermal breakdown composite dielectrics, solid
dielectrics used in practice.
Liquids:- Conduction and breakdown in pure and commercial liquids, suspended particle
theory, cavitation and bubble theory, stressed oil volume theory, Liquids used in practice.
Gases:- Ionization process, Townsend’s current growth equations, Ist and 2nd ionization
coefficients. Townsend’s criterion for breakdown. Streamer theory of breakdown, Pashen’s
law of Gases. Gases used in practice.
Generation of High Voltages:
D.C., A.C. (Power frequency and High frequency) Impulse voltage and impulse current
Generation Tripping and contact of Impulse Generator.
Test procedures in H.V. Engg. Lab.
Testing of cables, insulators, bushings, circuit breakers and transformers.