It occupies very less space 110th compared to ordinary substations. Gasinsulated substations gis the atmospheric air insulation used in a conventional, air insulated substation ais requires meters of air insulation to do what sf6 can do in centimeters. Abb is a pioneer of gistechnology, with unequaled knowhow and unrivaled system competence. According to the author gis are much more reliable, compact and maintenance free. Procurement of sf6 gas and supply of gas to the site is problematic. Installation and maintenance of gas insulated substation. The circuit breaker in a gas insulated system is metalclad and utilises sf6 gas, both for insulation and fault interruption. Conventional substations using atmospheric air as the main dielectric cannot satisfy these requirements, but totally enclosed substations using sulphur hexafluoride sf6 gas insulation that are also known as gas insulated substations gis. A primary advantage is its compactness, which allows a gis to be placed closer to a load center, and it is a more aesthetically attractive alternative for a neighborhood. Gas insulated substation gis advantages disadvantages. Gis can therefore be smaller than ais by up to a factor of 10. Xdge is one of the most reliable gas insulated switchgear suppliers with. Cities most reliable compared to air insulated substations, number of outages due to the fault is less. Hence, most preferred where area for substation is small eg.
Gas insulated substation gis vs conventional outdoor substation ais by engr. Meppi supplies sf6 gasinsulated transformers for applications where a nonflammable, nonpolluting transformer is desired, such as in densely populated areas, inside buildings, and in areas near lakes and rivers where potential oil leakage from a conventional transformer would be harmful to the environment. A gas insulated substation gis is a high voltage substation in whi ch the major structures are contained in a sealed environment with s ulfur hexafluoride sf6 gas as the insulating medium the basic principle of gas insulated equipment. Riaz ahsan baig year of publication 2004 0 abstract the author in his paper has made comparison of gas insulated substation gis with conventional air insulated substation ais. Gis technology is typically of modular design and filled with a minimum of sf6. These instructions for assembly are an integral part of the product and must be stored so that they are at any time readily accessible for and can be used by persons who are to work on the switchgear. Can be assembled at workshop and modules can be commissioned in the plant easily. Gis substations use sf6 gas that reduces the distance needed between active and nonactive switchgear parts, resulting in smaller overall space requirements. Normally this type of substations are indoor type and requires separate building. The following are the main advantages of gas insulated substations over air insulated substations and hybrid substations. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. Introduction to gas insulated substations switchgears gis. With ecofriendly aspects of sf6gas and considering advantage and properties of gas, sf6 gas is better insulating medium than oil.
Three years later, mitsubishi electric constructed the worlds first 550kv fully gas insulated switchyard at the ohi nuclear power station, which is the largest nuclear power plant in japan. A gas insulated substation due to its modular construction and compact nature is a viable alternative to the conventional air insulated substation. Cost is higher compared to air insulated substation or conventional substation. Product brochure gasinsulated switchgear elk04 modular. That means more than 40 years of customer fulfillment and longterm management of customer benefits. At these days the gis technology started based on extensive fundamental research and since then the service experience together with innovative. The circuit breaker is directly connected to either current transformers or the isolators in gas. Gas insulated mv switchgear technology provides a lot of benefits and gas insulated switchgear advantages which are harder to quantify. Advantages and disadvantages of sf 6 sulfur hexafluoride has several properties that make it a preferable dielectric fluid. Major components you can spot while looking at hvehv gis.
Southern california public power authority awards abb order for gis substation project. Gas insulated substations advantages disadvantages. Characteristic advantages of the elk0 substations are space saving, compact design high availability low maintenance and repair requirements short delivery and commissioning period consistent modular technology general. The circuit breaker is the most critical part of a gas insulated substation system. Gas insulated substations gis is a compact,multicomponent assembly enclosed in a ground metallic housing in which the primary insulating medium is compressed sulphur hexafluoride sf6 gas. It is suitable for both indoor and outdoor applications. Gas insulated substations conference 2018 in washington dc. One instance is the complete integration of gis substation in a. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. Gas insulated switchgear from 52 to 1,100 kv lothar heinemann, franz besold perpetual pioneering. Pdf application of gasinsulated modules gim to ehv. Hence these gas insulated substations gis are most preferred where area for substation is small eg.
The sf6 gas pressure in a circuit breaker is around 0. Abb substations with gas insulated switchgear gis are unmatched when it comes to compactness, reliability, efficiency and safety, ensuring maximum power availability for. National grid substations technical specification ngts 2. But it can be conclusive for the realization of a project. Pioneer and technology leader driving gis innovations. Occupies very less space 110th compared to ordinary substations. Design concept and advantages gas insulated switchgear ls sf6 gas insulated switchgear 5. It requires minimum floor space and building volume. Gis substation also offers unique advantages over air insulated applications.
Faced with increasing demands for reliability, improved aesthetics and security, the adoption of gas insulated substations gis by north american utilities is rapidly increasing. Foreign and indian origin as specified in the bid document, unloading at site and installation and commissioning of indoor gas insulated switchgear gis on turnkey basis and as specified in the following sections of this document. Installation of sf6 insulated switchgear has very largely increased all over the world, because of the advantages. In 1973, it installed the first 500kv hybrid gas insulated substation. This course includes gis monitoring topics including gas monitoring, partial discharge tests, and circuit breaker monitoring. Two different types of buses are used in substations, the rigid bus and the strain cable. And the availability and reliability of the gis substations are more compared to airinsulated substations faults occurring chances of air insulated substation or conventional substations are more. Gasinsulated substations high system reliability highflexibilityofitssolutions modularityexpandability gasinsulated substations high flexibility of its solutions modularity, expandability compact space saving solutions innovative solutions devices, switchgears low life cycle costs reliable and competent partners operator, manufacturer. Cities most reliable compared to air insulated substations. Amendment 1 a proper design of the substation bus ensures a safe and reliable operation of the substation and the power system.
Since then, more than 40,000 gis bays have been installed in substations worldwide. It has low lcc cost and can be used for indoor and outdoor application. Insulated switchgear ais and gas insulated switchgear gis substations for the purposes of building a 400kv substation for the laoiskilkenny reinforcement project. The main advantage of this gas insulated substation is because of its compact size due to a high dielectric strength of the sf 6 gas. Contents introduction conventional substation ais limitation of ais need for gis introduction to gis gis unique features components of gis substation advantages of gis over conventional open air substation disadvantage of gis next. Number of outages due to the fault is less maintenance free. Gis technology originated in japan, where there was a substantial need to develop technology to make substations as compact as possible. Substation configuration reliability 1 reliability of substation configurations daniel nack, iowa state university, 2005 introduction while one of the strongest points in a power system is the electric substation, it still contains what could be described as weak points or points of. A gas insulated substation gis is a high voltage substation in which the major structures are contained in a sealed environment with sulfur hexafluoride gas as the insulating medium. Gas insulated substation gis ieee conference publication. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. Companies also elect to use gis because of the increased load and limited space present in the urban areas. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. High cost is partly compensated by saving in cost of space.
In conclusion, lsis offers customers the most efficient and economical solutions. The control topics of bay controllers and control diagrams are also discussed. In several cases, air insulated substations ais equipped with gas insulated modules gim have been selected, up to 550 kv network voltage, instead of ais with traditional air insulated. Due to its enclosed construction, gas insulated substation is operable under. They will compare substation safety and security using ais vs. Pdf methods that have been used to evaluate the performance of uhf couplers for partial discharge monitoring of gas insulated substations are briefly.
More space is required for outdoor substation when compared to indoor gas insulated substation gis outdoor switch yards are more vulnerable to faults as it is located in outside atmosphere which has some influence from pollution, saline environment and other environmental factors. If the switchgear is sold to new owners, they must receive this document along with the. Gas insulated substations euci conference 2020 in anaheim. Gas insulated highvoltage switchgear gis is a compact metal encapsulated switchgear consisting of highvoltage components such as circuitbreakers and disconnectors, which can be safely operated in confined spaces. By considering all characteristics, features and advantages of gas insulated transformer, gas insulated transformer offers best solution for overcoming the sharp increase in electric power demand in large cities. The speakers will discuss reliability and system planning implications for gas insulated substations. Gasinsulated substations ge provides a full range of gasinsulated substations gis for utilities and industries worldwide.
The space occupied by sf6 installation is only about 10% of that of a conventional outdoor substation. Fuji electric as a manufacturer of comprehensive substation equipment is ready to supply advanced sf6 gas insulated switchgear gis superior in reliability, disaster prevention, safety and environmental harmony. Double 400kv busbar and double 110kv busbar technically, both ais and gis substation types are considered acceptable for the. Lsis who has been a leader in electricity and automation. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a minimum of cost.
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