What is gas insulated switchgear substation?
A gas insulated substation (GIS) is a high voltage substation in which the major conducting structures are contained within a sealed environment with a dielectric gas known as SF6, or sulfur hexafluoride gas as the insulating medium.
What is SF6 gas insulated switchgear?
S SF6 gas insulated switchgear is a new generation medium voltage switchgear. The entire SF6 gas tank sealed high-voltage components such as busbars, circuit breakers, disconnectors with 1.4bar pressure SF6 gas in IP67 protection degree.
Which gas is used in GIS substation?
SF6
A gas-insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase-tophase and phase-to-ground insulation.
Why SF6 is used in GIS?
SF6 is used in GIS at pressures from 400 to 600 kPa absolute. The pressure is chosen so that the SF6 will not condense into a liquid at the lowest temperatures the equipment experiences. SF6 has two to three times the insulating ability of air at the same pressure.
What is gas-insulated switchgear used for?
Gas insulated switchgears (GISs) are installed as substation equipment and receiving equipment for safe and stable supply of electricity. Circuit breakers, disconnectors, earthing devices, etc. are enclosed and stored in metal containers using a high-insulation-performance gas.
What is the function of gas-insulated switchgear?
Gas Insulated Switchgear (GIS) is the name for a unit that houses these components and circuits in a single gas tank with a compact footprint. Grounding devices that prevent electrical shock and lightning arresters that prevent dielectric breakdowns from lightning strikes are also included to enhance safety.
Why is SF6 used in switchgear?
SF6 is widely used in high voltage electrical switchgear as it has a number of unique properties which make it almost perfect for this application; its high dielectric strength, self-healing and non-toxic properties are particularly useful in electrical switchgear.
What is SF6 used for?
Sulfur hexafluoride (SF6) /is/ used as an electrical insulating material in circuit breakers, cables, capacitors, and transformers .
Why is switchgear gas insulated?
What is gas insulated switchgear used for?
What are the advantages of gas insulated substation?
increase the cost of maintenance and equipment degradation. As indicated, the cost of a GIS indoor substation is much higher compared to an AIS substation, but the benefits of a GIS are by far more desirable and include high reliability, less space and far less maintenance.