The author in his paper has made comparison of gas insulated substation. The sf 6 gas which has high dielectric property acts as an insulating medium to the high. Airinsulated substations up to 800 kv digital asset management. There are five major considerations in the differences between the two high voltage substations. Gas insulated substations are used where there is space for providing the substation is expensive in large cities and towns 21. Basic working operations of both the substations are same. Gis highvoltage gas insulated switchgear substations. This workshop will provide an overview of compact gas insulated substations gis and compare gis to traditional air insulated substations ais. 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. Siemens is a leading supplier of engineer ing, equipment, solutions, and services for highvoltage substations, such as airinsulat ed substations, gas insulated. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a minimum of cost. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation.
Gis with conventional air insulated substation ais. Gas insulated substation gis advantages disadvantages. Given the challenges associated with the threats posed by high impact naturally and humancaused physical events that can damage substations, many utilities are turning to gas insulated technologies. Operation and maintenance of a gas insulated substation.
Technoeconomic comparison between gas insulated substation gis and air insulated substation ais. Difference between air insulated switchgear and gas. A major difference between conventional air insulated substations ais and the gas insulated substations gis is that the sf6 gas insulated electrical components are placed within an earthed, pressurized metallic container. The air insulated substation dissected plh group inc. A gas insulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. Abbs innovative hybrid substations combine gas and air insulated switchgear technologies to make the installation more compact, minimize maintenance requirements and maximize availability and reliability. Sub stationsair insulated substations linkedin slideshare. Siemens is a leading supplier of engineering, equipment, solutions, and services for highvoltage substations, such as air insulated substations, gas insulated substations, and gas insulated lines. The sf6 gas insulated substation gis is assembled by several sf6 gas insulated switchgear configurations in an outdoor enclosure which could reach ip54 protection grade. Sf6 gas having high dielectric property acts as insulating medium. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. This includes conductors and clamps to connect the equipments together, circuit breakers to switch the power on and off and transformers to change the system voltage.
Modeling and simulation of air insulated and gas insulated. Substations rely on copper grounding on equipment and in the ground to properly ground the system and make it safe. Gas insulated substation electrical substation transformer. Air insulated, gas insulated and mixed technology switchgear substations together with the essential secondary systems. Understand the role of hv airinsulated substation, and gain insight on transformers, circuit breakers, disconnectors, surge arresters and instrument transformers. 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. Gas insulated substations offer other advantages in addition to the reduced space requirements. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in sf6 gas inside grounded metal enclosures. 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 substation gis also called sf6 gas insulated metalclad switchgear is preferred for. Author links open overlay panel raj nagarsheth sushant singh. Hello, this video is for comparing of gas insulated substation gis vs air insulated substation ais for urban and rural areas with discussion of each individual substation. With the use of gas insulated substations, energy supply companies can reduce their operating and maintenance costs and hence survive strongly in the competitive era.
Gas insulated substations is an allinclusive reference guide to gas insulated substations gis which takes account of its basic principles, technology, application, design specification, testing and ownership issues. 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. Abb substations with airinsulated switchgear ais provide a costefficient and. Gas insulated substations gis differ from air insulated substations substations we usually see such that all the substation equipment such as busbars, circuit breakers, current transformer, potential transformers and other substation equipment are placed inside sf 6 modules filled with sf 6 gas. Study of gas insulated substation and its comparison with air insulated substation. Gas insulated substation gis vs air insulated substation. Both the substations have equal merits and demerits in different aspects. This paper presents a comparative analysis of gas insulated substation and air insulated substation. This article is an introduction to gasinsulated substations. This paper presents the environmental comparison of air insulated and gas insulated switchgears for a specific 220 kv project. What is the difference between air insulated substation. Air insulated substation means air acts as the dielectric medium but in case of gas insulated substation sf6 is the dielectric medium. Due to this, large space is required for the normal or air insulated substation ais. There are five major differences between airinsulated substation engineering and gasinsulated engineering.
You will find five major deliberations in the differences between the two hv substations. Though, both have some properties which differs each other. Primarily used in substations located in urban areas including inside buildings, underground due to safety benefits. An airinsulated substation ais is one where the main circuit potential is. Gas insulated substations gis have different specifications in proportion to air insulated substations. You see, the differences between the gas insulated substation and air insulated substation are massive. According to the author gis are much more reliable, compact and maintenance free. In comparison, a conventional ais or air insulated substation, atmospheric air.
Air insulated substations contain various types of equipment to provide a fully functioning system. Gas insulated switchgear or substations gis have been successfully in use for almost 40 years with an increasing use world wide. The remaining substations in the hv cable ring, which are also located in the city center, are htype transformer substations with a bustie. The main differences between ais air insulated switchgear and gis gas insulated switchgear can be summarized as in attached document, the technology selection remains affected by economic considerations and local habits on a projectsolution level. With the advantage of sf6 gas insulating ability the interrupting arcs capability is 100 times more than air, gas insulated substation could operate in stable condition for. Gas insulated substations euci conference 2020 in anaheim. Our portfolio of highquality products and advanced technologies, including disconnecting circuit breakers dcb and iec 61850 substation automation systems, reduce substation footprint and enable smart grid integration. Gas insulated substation definitions and basics cedengineering. Environmental impact comparison between a 220 kv gas. Additionally specialized substations such as ultra high voltage uhv, offshore substations for wind power plants and the use of gas insulated lines are included. Iec 62271203 highvoltage switchgear and controlgear part 203.
The content of the book covers a range of substation topologies. Pdf since the liberalization of the energy markets in the late 90s of the last century, the application of gas insulated substation gis becomes more. Gas insulated substations are having more advantages than air. 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. Gas insulated substations are used where there is space for providing the substation is expensive in large cities and towns. Comparison of gis and ais systems for urban supply networks. Gis there are two terms presented in iec gas insulated switchgear and ieee. Airinsulated substation elearning ge grid solutions. As the electricity demand is increasing day by day, the power companies are giving their active. Vfto are generated mainly due to the closing and opening operation of the disconnector switch 6. Historically, substation designs for the most part have been based on standardized engineering practices and traditional air insulated technology.
The differences between air insulated substation engineering and gas insulated substation engineering are vast. A brief study of both the substations is carried out. In normal substation the clearances between the phase to phase and phase to ground is very large. Gas insulated substations use sulphur hexa fluoridesf6 gas which has superior dielectric properties. Easy to expand in case that space is not an issue excellent overview, simple handling and easy access. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the start. Transformer failures related to lightning and switching are often reported in the gas. Hence, these companies must find a decision between air insulated and gas insulated substations as per the needs and requirements. An introduction to gas insulated electrical substations. Gas insulated substations gis for enhanced resiliency. Abb substations with air insulated switchgear ais provide a costefficient and wellproven solution without compromising on reliability. Introduction to gas insulated substations switchgears gis. Pdf comparison between gas and air insulated network concepts. Gas insulated transformer use sf6 gas as the insulating and cooling medium instead of insulating oil.
Gas insulated substations gis are different from air insulated substations as all the substation equipment such as bus bars, circuit breakers, current transformer, potential transformers and other substation equipment are placed inside the modules filled with sf6 gas. Conclusion gas insulated substations wiley online library. New delhi, india 400220kv gis susbstation with automation english pdf. The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. This is a significant change in operating the switchgear with circuit breakers, disconnectors, and switches earth. The clearance required for phase to phase and phase to ground for all equipment is much lower than that required in an air insulated substation. A typical gas insulated substation is shown in fig.
Because the substation is enclosed in a building, a gis is less sensitive to pollution, as well as salt, sand or large amounts of snow. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. In this paper equivalent circuit of substation is designed in matlabsimulink software to. 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. With gis experience spanning 50 years across a wide range of industries and applications, ge is a leader in the. Results confirm that the gis substation has a lower environmental impact than the ais one on the majority of environmental indicators. Ge provides a full range of gasinsulated substations gis for utilities and industries worldwide. Although the initial cost of building a gis is higher than building an air insulated substation, the operation.
Modeling and simulation of air insulated and gas insulated substations 179 study of fast transient voltage is a very important aspect in gas insulated substation. Gas insulated substation gis vs conventional outdoor substation ais by engr. A gas tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance. Study of gas insulated substation and its comparison with. Traditionally gis substations were used only when real estate was extremely limited or real estate andor site preparation was very expensive. The study evaluates the impact of the two technologies on 18 environmental indicators. In this article, we take a look at the air insulated substation ais. Pdf technoeconomic comparison between gas insulated. 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. A study of air insulated substation ais and gas insulated substation gis including its merits and demerits are discussed in this paper. Due to their compactness and flexibility, gis substations can be lo cated close. Looking for answers on what makes air insulated switchgear different from gas insulated switchgear. Air insulated substation ais life cycle cost method lcc highly integrated gas.
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