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ICTD International Centre for Training and Development

Maintenance of gis and SF6 Gas Switchgear

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Switchgear plays an important role in the safe and reliable distribution of electrical power. Failure to quickly and efficiently disconnect faults downstream in the network, or a failure within the switchgear itself is costly, resulting in loss of supply, damage to equipment and possible injury, to personnel. It is therefore important that switchgear is selected, installed, operated and maintained correctly, embracing an overall asset management regime that is both economic and effective in securing a high level of system reliability.

This course focuses on switchgear associated with power distribution in industrial systems, which comprises by far the bulk of switchgear on most electricity distribution systems. The emphasis is primarily on air-break, SF6 and vacuum circuit breakers. Gas insulated equipment, (GIS), for higher voltages will be discussed in some detail.

Course Objectives

Upon successful completion of this course, the delegates will be able to:

  • Recognize the switchgear construction
  • Learn more details on switchgear commissioning
  • Know inspection, maintenance, and operation of switchgear

Course Outline

Day 1

  • MV, HV and EHV switchgear
  • Switchgear construction
  • Methods of symmetrical & asymmetrical fault calculations
  • GIS apparatus and components
  • Properties of SF6 gas
  • Handling of SF6
  • Breakdown mechanism of SF6
  • Circuit breakers principles of operation
  • Arc interruption
  • Circuit breaker ratings

Day 2

  • Transient system models for switching transients
  • Transient recovery voltages
  • Rate of rise of re-striking voltages
  • Breaking capacity
  • Making capacity
  • Capacitive switching and prospective voltages due to chopping of inductive current
  • Current transformers and voltage transformers
  • Troubleshooting of switchgear and remained actions

Day 3

  • Three phase short circuit switching
  • Modern SF6 switchgear
  • Maintenance of circuit breakers
  • Inspection, servicing and overhaul
  • Guidelines of switchgear maintenance
  • Maintenance of quenching medium contacts
  • Maintenance schedule check list of switchgear
  • Maintenance of SF6 circuit breakers, vacuum circuit breakers and oil circuit breakers
  • Important checks of sf6 switchgear during routine maintenance
  • Testing of SF6 switchgear according to IEC standards
  • Oil and air circuit breakers
  • Maintenance of oil and air circuit breakers

Day 4

  • Modern vacuum switchgear
  • Maintenance of vacuum circuit breakers
  • Important checks of vacuum circuit breakers during maintenance
  • Testing of switchgear according to IEC standards
  • Commissioning tests of switchgear
  • Earthing of switchgear

Day 5

  • Switching requirements for stable operation and for safety
  • Electrical switching phenomena
  • Comparison of different types for various switching duties
  • Gas insulated switchgear
  • Switchgear testing according to IEC standards
  • Mechanical rated life of a switching device

Course Methodology

A variety of methodologies will be used during the course that includes:

  • (30%) Based on Case Studies
  • (30%) Techniques
  • (30%) Role Play
  • (10%) Concepts
  • Pre-test and Post-test
  • Variety of Learning Methods
  • Lectures
  • Case Studies and Self Questionaires
  • Group Work
  • Discussion
  • Presentation

Who should attend

This course is valuable for Electrical engineers, electricians and other technical staff involve in maintenance of GIS and Switchgears.


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