What is air insulated?
An air-insulated substation (AIS) is one where the main circuit potential is insulated from the ground by air using porcelain or composite insulators and/or bushings.
What is air insulated switchgear?
Air insulated switchgear(AIS) adopts the air as the insulation media designed voltage ranging from 11KV to 36KV medium voltage power distribution system. It plays a controlling and protecting role in the power system. The main circuit components of the air insulated switchgear are built in the gas-filled compartment.
What is the difference between air insulated and gas insulated switchgear?
GIS high voltage substation engineering uses the gas sulfur hexafluoride for insulation, whereas AIS uses air insulation in a metal-clad system. Another significant construction-based difference between the two switchyards is that a metal-clad AIS uses three-position draw-out circuit breakers (on, off and test).
What stand for AIS and GIS?
Gas insulated substation (GIS) versus Air insulated substation (AIS)
Why is gas insulated substation?
The poor dielectric properties of air, as well as secondary factors such as humidity, pollutants, salt, and moisture means that more space is needed. A gas-insulated substation (GIS) uses a superior dielectric gas, sulfur hexafluoride (SF6), at a moderate pressure for phase to phase and phase to ground insulation.
Why do we need gas insulated substations GIS?
A gas-insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase-tophase and phase-to-ground insulation. As a result, GIS is more reliable and requires less maintenance than AIS. GIS was first developed in various countries between 1968 and 1972.
What are the disadvantages in GIS over AIS?
Disadvantages of GIS Internal faults tend to be very costly and severe when they occur. They often lead to long outage periods. 5. Though the gas is quite inert, flash problems can break it down into harmful by-products such as metal fluoride powders.
What is the single most important reason for choosing GIS instead of AIS technology?
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 are disadvantages of GIS?
Disadvantages of using GIS are that its technical nature may portray results as being more reliable than they actually are and the errors and the assumptions can be hidden , leading to a lack of questioning into the results .
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.
Where gas insulated substation is used?
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.
What does air insulated switchgear ( AIS ) do?
Air insulated switchgear (AIS) adopts the air as the insulation media designed voltage ranging from 11KV to 36KV medium voltage power distribution system. It plays a controlling and protecting role in the power system.
How does the air insulated substation ( AIS ) work?
In this article, we take a look at the air insulated substation (AIS). AISs, which are more common, use air to insulate the different components of the substation from each other as well as for grounding the charge. Substations rely on copper grounding on equipment and in the ground to properly ground the system and make it safe.
What kind of plate is an air insulated box made of?
The Air Insulated Box is fabricated from steel plate and has a gasketed removable panel at the front and a removable gasketed polyester/glass barrier plate at the rear. The area of fabrication around the barrier plate provides an interface to the equipment.
Which is better gas insulated or air insulated switchgear?
Compared with the gas insulated switchgear, air-insulated switchgear has more obvious advantages. That’s because it does not inflate. It is an easy maintenance inflatable switchgear. The filling gas in the gas insulated switchgear is SF6 and N2 normally, so the maintenance cost is much higher than AIS.