Gas-Insulated Switchgear Course: Design, Installation, Operation and Maintenance, Testing

28.45 $

This course covers the essentials of a Gas-Insulated Switchgear (GIS), main components and layouts/diagrams, and other GIS equipment in a substation. You will learn to recognize GIS parts and to properly read various GIS diagrams. The course consists of 16 lessons in 3h 2min. total length.



This course covers the essentials of a Gas-Insulated Switchgear, or shortly ‘GIS‘, that every electrical engineer who deals with power substations and electrical equipment in the field should know. You will learn all major equipment installed within GIS, such as circuit breaker or switch, disconnector, grounding switch, current and voltage transformers, busbars, busducts and interconnecting parts, SF6 gas-to-air bushing, cable box/cable sealing, power transformer interface chamber/bushing, and surge arrester.

Students will learn why gas-insulated switchgear is often used in industrial areas to fulfill high energy demands by space saving design with a minimum of cost, and why only SF6 insulated switchgear is able to fulfill these requirements.

It is important for an engineer to have a basic understanding of the basic GIS components and layout/diagrams of the GIS and GIS equipment being dealt with. This is essential you must learn before entering any substation where GIS is installed and operational.

Topics discussed in this course

The following topics will be discusses in this course:

  • Introduction to Gas Insulated Substation
  • Comparison of AIS Vs GIS
  • Installation
  • GIS Operation
  • GIS Maintenance
  • Total Cost of Ownership
  • Circuit Breaker
  • Pole Marking
  • Interrupter Unit
  • Single & multiple interrupter
  • Why it is required to add interrupter unit
  • Why interrupter units are added in series
  • Single mechanism for each pole and single mechanism for each pole
  • Pole Discrepancy
  • Arc Quenching
  • Circuit Breaker Chamber details
  • Circuit Breaker Operating Mechanism
  • What is SF6 electronegativity?
  • Why speed of circuit breaker is important for arc quenching?
  • CB fixed and moving contacts
  • Why too fast CB closing create problems?
  • Pole synchronization & allowable tolerance
  • Hydro Mechanical system, latest technology
  • CB Aux contacts
  • Puffer interrupting Units
  • Self-blast interrupting Units
  • Why arc quenching depend on current in self-blast circuit breaker.
  • Thermal Chamber in CB interrupter unit
  • GAS Tight & Gas Permeable Insulators
  • Gas Compartment
  • Marking of Gas Compartment
  • Review Gas Diagram
  • Gas Monitoring Devices
  • SF6 Alarm & Lock Out Stage
  • Inspection Window
  • Steel Structure
  • GIS Earthing
  • Current Transformer
  • Basic definition of current transformer
  • Multi Ration & Multi Core CT’s
  • CT Polarity
  • Primary and secondary windings
  • Why Polarity is very important
  • CT Protection and metering cores
  • Rating of CT
  • Voltage Transformer
  • Definition of VT
  • Multi core VT
  • Rating of VT
  • Class of VT, Protection and Metering
  • Location of VT in SLD
  • Surge Arrestor (SA)
  • Surge Counter
  • Construction of Surge Arrestor
  • Maintenance & Monitoring of SA
  • Grading Electrode of SA
  • Isolator & Earth Switch
  • Mechanical and Electrical Interlocking
  • Busbar isolator and busbar earth switch interlocks
  • Use of earth switches for performing primary injection test
  • Difference between normal earth switch and high speed earth switch
  • SF Air Bushing
  • High Speed Earth Switch
  • Where high speed earth switch is used?
  • Local Control Cubicle
  • Local / Remote Control
  • Alarms on LCC
  • Mimic
  • Trip Circuit Supervision indication
  • Marshaling Kiosk (MK)
  • Busbar
  • Bonding
  • Cable Compartment
  • Cable Sealing End
  • SF6 Gas
  • Properties of SF6 Gas
  • Insulation level of SF6 compare to air
  • Impact pressure on SF6 insulation ability
  • Purity and dew point test
  • Leakage test / Gas Tight test
  • Leakage Detector

Additional information


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