JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems

Course Objectives:

• To learn the reasons for occurrence of transients in a power system.
• To understand the change in parameters like voltage & frequency during transients.
• To know about the lightning phenomenon and its effect on power system.

Course Outcomes

After completion of the course, students will be able to:

• Get knowledge of various transients that could occur in power system and their mathematical formulation.
• Design various protective devices in power system for protecting equipment and Personnel.
• Coordinate the insulation of various equipment in power system.
• Model the power system for transient analysis.

UNIT - I

Fundamental circuit analysis of electrical transients, Laplace Transform method of solving simple Switching transients, damping circuits, abnormal switching transients, Three-phase circuits and transients, Computation of power system transients.

UNIT - II

Principle of digital computation, Matrix method of solution, Modal analysis, Z-transform, Computation using EMTP, Lightning, Switching and temporary over voltages, Lightning, Physical phenomena of lightning.

UNIT - III

Interaction between lightning and power system, Influence of tower footing resistance and Earth Resistance, Switching, Short line or kilometric fault, energizing transients, Closing and re-closing of lines, Line dropping, Load rejection, over voltages induced by faults.

UNIT - IV

Switching HVDC line, travelling waves on transmission line, Circuits with distributed Parameters, Wave Equation, Reflection, Refraction, Behavior of Travelling waves at the line Terminations, Lattice Diagrams, Attenuation and Distortion factors, multi-conductor system and Velocity wave.

UNIT - V

Insulation co-ordination: Principle of insulation co-ordination in Air Insulated Substation (AIS) and Gas Insulated Substation (GIS), Coordination between insulation and protection level, Statistical approach. Protective devices, Protection of system against over voltages, Lightning arresters, Substation earthling.

TEXTBOOKS:

• 1. Allan Greenwood, “Electrical Transients in Power System”, Wiley & Sons Inc., New York, 1991.
• 2. Harold A Peterson, “Transient in Power Systems”, McGraw Hill, 1966.

REFERENCES:

• 1. Kuffel and Abdullah, “High Voltage Engineering”, PHI, 2000.
• 2. Rakesh D. Begamudre, “EHV AC Transmission Engineering”, PHI, 2006. M. Tech – III Semester L T P C 3 0 0 3