What is gas insulation 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 are the different types of gas insulated substations?
There are different types of gas insulated metal enclosed switchgears available depending upon their constructional feature.
- Isolated Phase GIS. In this configuration, each phase of the bay is assembled separately.
- Integrated 3 Phase GIS.
- Hybrid GIS System.
- Compact GIS.
- Highly Integrated System.
What is the need of gas insulated substation?
A GIS is mostly used where space is expensive or not available. In a GIS the active parts are protected from the deterioration from exposure to atmospheric air, moisture, contamination, etc. As a result, GIS is more reliable and requires less maintenance than AIS.
What is AIS and GIS substation?
GIS high voltage substation engineering uses the gas sulfur hexafluoride for insulation, whereas AIS uses air insulation in a metal-clad system. Sulfur hexafluoride is five times heavier than air and offers excellent extinction behavior.
Where is the gas insulated substation installed?
SF6 Gas Insulated Substations are compact and can be installed conveniently on any floor of a multi-storeyed building or in an underground substation. As the units are factory assembled, the installation time is substantially reduced.
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.
Where gas insulated substation is located?
Which is better GIS or AIS?
Due the design characteristics, GIS has a better impact on environment than AIS. As observed, GIS offers many prominent advantages over AIS. It meets all requirements for new substation design, except high initial investment and potential environmental risk.
What are the different types of 11kv substation?
Other types of substations are very huge with different types of transformers, equipment, circuit breakers, and switches.
- Substation.
- Step-up Substation.
- Distribution Substation.
- Underground Substation.
- Switchyard.
- 11kv Substation.
- 220 kV Substation.
- 132 kV Substation.
What are the three types of substation?
Substation Types: Although, there are generally four types of substations there are substations that are a combination of two or more types.
- Step-up Transmission Substation.
- Step-down Transmission Substation.
- Distribution Substation.
- Underground Distribution Substation.
- Substation Functions.
- Substation Equipment.
What is GIS switchboard?
Gas-insulated high-voltage switchgear (GIS) is a compact metal encapsulated switchgear consisting of high-voltage components such as circuit-breakers and disconnectors, which can be safely operated in confined spaces.
What are the components of a Gas Insulated Substation?
GAS INSULATED SUBSTATIONS Components: 1- Circuit breaker. 2-Disconnector (Isolator). 3-Ground switches. 4-Bus-bar. 5-Transformer. 8-Outgoing bus-bar for electrically connecting the gas insulated substation with bus-bar. 9-Outgoing portion of the transformer being arranged in accordance with extending direction of outgoing bus-bar.
What is AIS (air insulated substation)?
Air Insulated Substation (AIS): Air used as a dielectric. Normally used for outdoor substations. In very few cases used for indoor substations. Easy to expand (in case that space is not an issue) Excellent overview, simple handling and easy access. 10-Sep-12 5 6.
Why GIS for 765kv substation installation?
The footprint of 765kV conventional substation is enormous, and GIS technology allows a significant size reduction. Urban Installations GIS technology can be used for installations in areas where the cost of real estate or aesthetic appeal is a significant consideration.