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. Gas insulated substation gis ieee conference publication. Can be assembled at workshop and modules can be commissioned in the plant easily. 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. Companies also elect to use gis because of the increased load and limited space present in the urban areas.
According to the author gis are much more reliable, compact and maintenance free. Continuous technological and design improvements of all the components during the course of the time are characterized by appreciable savings in area and volume occupied by the substation. The circuit breaker is directly connected to either current transformers or the isolators in gas. A gas insulated substation due to its modular construction and compact nature is a viable alternative to the conventional air insulated substation. 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. With ecofriendly aspects of sf6gas and considering advantage and properties of gas, sf6 gas is better insulating medium than oil. The control topics of bay controllers and control diagrams are also discussed. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. 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. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a minimum of cost. Number of outages due to the fault is less maintenance free. It has low lcc cost and can be used for indoor and outdoor application. Gis can therefore be smaller than ais by up to a factor of 10.
Product brochure gasinsulated switchgear elk04 modular. Gas insulated switchgear from 52 to 1,100 kv lothar heinemann, franz besold perpetual pioneering. Amendment 1 a proper design of the substation bus ensures a safe and reliable operation of the substation and the power system. 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. This course includes gis monitoring topics including gas monitoring, partial discharge tests, and circuit breaker monitoring. The circuit breaker in a gas insulated system is metalclad and utilises sf6 gas, both for insulation and fault interruption. It is suitable for both indoor and outdoor applications. The space occupied by sf6 installation is only about 10% of that of a conventional outdoor substation.
One instance is the complete integration of gis substation in a. The following are the main advantages of gas insulated substations over air insulated substations and hybrid substations. It requires minimum floor space and building volume. Hence, most preferred where area for substation is small eg. They will compare substation safety and security using ais vs. Gas insulated substations conference 2018 in washington dc. At these days the gis technology started based on extensive fundamental research and since then the service experience together with innovative. Gas insulated switchgear gis is a proven technology used throughout the world that offers many advantages over a conventional substation. Due to its enclosed construction, gas insulated substation is operable under. Since then, more than 40,000 gis bays have been installed in substations worldwide. If the switchgear is sold to new owners, they must receive this document along with the. High cost is partly compensated by saving in cost of space. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. 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.
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 mv switchgear technology provides a lot of benefits and gas insulated switchgear advantages which are harder to quantify. Gas insulated substation gis advantages disadvantages. Gas insulated substations advantages disadvantages. Double 400kv busbar and double 110kv busbar technically, both ais and gis substation types are considered acceptable for the. 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. Two different types of buses are used in substations, the rigid bus and the strain cable. Design concept and advantages gas insulated switchgear ls sf6 gas insulated switchgear 5.
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. 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. Installation of sf6 insulated switchgear has very largely increased all over the world, because of the advantages. Advantages and disadvantages of sf 6 sulfur hexafluoride has several properties that make it a preferable dielectric fluid. Faced with increasing demands for reliability, improved aesthetics and security, the adoption of gas insulated substations gis by north american utilities is rapidly increasing. Major components you can spot while looking at hvehv gis. Abb is a pioneer of gistechnology, with unequaled knowhow and unrivaled system competence.
Pioneer and technology leader driving gis innovations. Sf6 gas insulated transformers mitsubishi electric. 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. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. 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.
That means more than 40 years of customer fulfillment and longterm management of customer benefits. The sf6 gas pressure in a circuit breaker is around 0. Insulated switchgear ais and gas insulated switchgear gis substations for the purposes of building a 400kv substation for the laoiskilkenny reinforcement project. In 1973, it installed the first 500kv hybrid gas insulated substation. 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. Gasinsulated substations ge provides a full range of gasinsulated substations gis for utilities and industries worldwide. 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. 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. 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. In conclusion, lsis offers customers the most efficient and economical solutions. It occupies very less space 110th compared to ordinary substations. 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. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. Gis technology originated in japan, where there was a substantial need to develop technology to make substations as compact as possible.
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. Occupies very less space 110th compared to ordinary substations. Cities most reliable compared to air insulated substations. Gis substation also offers unique advantages over air insulated applications. Installation and maintenance of gas insulated substation. 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. 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. Gis substations use sf6 gas that reduces the distance needed between active and nonactive switchgear parts, resulting in smaller overall space requirements. Xdge is one of the most reliable gas insulated switchgear suppliers with. Southern california public power authority awards abb order for gis substation project. 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.
Pdf application of gasinsulated modules gim to ehv. Pdf methods that have been used to evaluate the performance of uhf couplers for partial discharge monitoring of gas insulated substations are briefly. Gas insulated substations euci conference 2020 in anaheim. 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. 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. The circuit breaker is the most critical part of a gas insulated substation system. Normally this type of substations are indoor type and requires separate building. Cost is higher compared to air insulated substation or conventional substation.