What is the advantages of gas insulated switchgear?
The main advantage of gas-insulated switchgear (GIS) over AIS or MTS is its compactness which has a direct influence on land requirement, land cost, visual impact, and possible technical applications.
What is the use of gas insulated substation?
A gas-insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase-tophase and phase-to-ground insulation. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in SF6 gas inside grounded metal enclosures.
What is the difference between air insulated substation and gas insulated substation?
Construction. 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. GIS systems use fixed, mounted circuit breakers.
Which is better GIS or AIS?
The compact and metal-enclosed design of GIS has prominent advantages and better performance than AIS. However, the high initial investment is a key obstacle in expanding the application of GIS….5. Disposal cost.
What is gas insulated substation PPT?
Gas Insulated Substation:Introduction: Compact, multi-component assembly. Enclosed in a ground metallic housing. Sulphur Hexaflouride (SF6) gas – the primary insulating medium. (SF6) gas- superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation Preferred for …
When gas insulated substation is employed?
Gas insulated switchgear is used in industrial areas to fulfill high-energy demands by space saving design with a minimum of cost. Only SF6 insulated switchgear is able to fulfill these requirements.
Which gas or gases mixture is used in gas insulated substation?
Sulfur hexafluoride (SF6), which is the preferred gas for use in gas-insulated switchgear (circuit breakers, disconnect switches, etc. for high-voltage electrical circuits), has a very high global warming potential, and there is a large international effort to find alternative gases.
What are the advantages and disadvantages of gas insulated substations?
Some of the advantages and disadvantages of Gas Insulated Substations (GIS) are: It occupies very less space (1/10th) compared to ordinary substations.
Which is better SF6 or air insulated substation?
But the dielectric strength of SF6 gas is higher compared to the air, the clearances required for phase to phase and phase to ground for all equipments are quite lower. Hence, the overall size of each equipment and the complete substation is reduced to about 10% of the conventional air insulated substation.
Why is GIS substation out rule ordinary substation?
In large cities area for commissioning an ordinary Air insulated substation is difficult because of the lack of space available. In such conditions GIS substations out rule the ordinary substation. However, it is to be considered that GIS substation requires high capital cost compared to an ordinary substation.
What are the disadvantages of gas insulated switchgear?
Disadvantages The disadvantages of gas-insulated switchgear include the following. As compared with other substations like conventional or air-insulated, these are expensive. Once fault happens inside, the outage phase will be extremely long and the effect of damage will also be very severe.