JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Switch Gear and Protection

Course objectives:

• To know the GIS concepts and principles
• To distinguish Air Insulated and Gas insulated Substations
• To demonstrate the design and constructional aspects of GIS
• To analyze transient phenomenon, problems and diagnostic methods in GIS

Course Outcomes

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

• Know the advantages of GIS systems over air insulated systems
• Observe constructional design features of GIS design
• Discriminate the problems and design diagnostic methods of GIS

UNIT - I

INTRODUCTION TO GIS AND PROPERTIES OF SF6 Characteristics of GIS- Introduction to SF6 , Physical properties, Chemical properties, Electrical properties, Specification of SF6 gas for GIS application, Handling of SF6 gas before use, Safe handling of Sf6 gas in electrical equipment, Equipment for handling the SF6 Gas, SF6 and environment.

UNIT - II

LAYOUT OF GIS STATIONS Advancement of GIS station, Comparison with Air Insulated Substation, Economics of GIS, User Requirements for GIS, Main Features for GIS, Planning and Installation components of a GIS station.

UNIT - III

DESIGN AND CONSTRUCTION OF GIS STATION Introduction, Rating of GIS components, Design Features, Estimation of different types of Electrical Stresses, Design Aspects of GIS components, Insulation Design for Components, Insulation Design for GIS, Thermal Considerations in the Design of GIS, Effect of Very Fast Transient Over-voltages (VFTO) on the GIS design, Insulation Coordination systems, Gas handling and Monitoring System Design.

UNIT - IV

FAST TRANSIENT PHENOMENA IN GIS Introduction, Disconnector Switching in Relation to Very fast Transients-Origin of VFTO, Propagation and Mechanism of VFTO, VFTO Characteristics, Effects of VFTO, Testing of GIS for VFTO.

UNIT - V

SPECIAL PROBLEMS IN GIS AND GIS DIAGNOSTICS Introduction, Particles their effects and their control, Insulating Spacers and their Reliability, SF6 Gas Decomposition, Characteristics of imperfections in insulation, Insulation Diagnostic methods, PD Measurement and UHF Method.

TEXTBOOKS:

• 1. M. S. Naidu,” Gas Insulated Substations”, IK International Publishing House.
• 2. Hermann J. Koch, “Gas Insulated Substations”, Wiley-IEEE Press, Jun, 2014.

REFERENCES:

• 1. Olivier Gallot-Lavellee, “Dielectric materials and Electrostatics”, Wiley-IEEE Press.
• 2. Jaun Martinez, “Dielectric Materials for Electrical Engineering”, Wiley-IEEE Press. M. Tech – III Semester L T P C 3 0 0 3