JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Switch Gear and Protection

Course objectives: to prepare the students to

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

Course Outcomes

Upon the completion of this course, the student 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 Sf 6 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.

TEXT BOOKS:

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

REFERENCES:

• 1. Olivier Gallot-Lavellee, “Dielectric materials and Electrostatics” , Wiley - IEEE Press.
• 2. Jaun Martinez, “Dielectric Materials for Electrical Engineering”, Wiley - IEEE Press. R19 M. TECH. EPE/EPS M. TECH. II Year I Sem. (EPE/EPS)