The differences between air insulated substation engineering and gas insulated substation engineering are vast. Iec 62271203 highvoltage switchgear and controlgear part 203. An introduction to gas insulated electrical substations pdh. Can be assembled at the shop and modules can be commissioned in the plant easily. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in sf6 gas inside grounded metal enclosures. 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. Participants will have the opportunity to learn about gis low to high voltage designs, applications and expansion. 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. According to research, gis is more reliable, multicomponent and maintenance free as it need very less space. Gasinsulated 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. Moreover, the development of increasingly compact switchgear entails a constant reduction of the required amount of gas.
Sf6 gas insulated switchgeargis has vacuum circuit breaker and disconnector without maintenance, which greatly reduces maintenance and inspection workload. Gas insulated substations regulatory, technical, and business considerations. This course is based on terms used in ieee and iec regulations. There are five major differences between airinsulated substation engineering and gasinsulated engineering. The latest research report from business intelligence provider visiongain offers a comprehensive analysis of the top gas insulated substation gis companies. A gas tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance. Sf6 insulated 110kvswitchbay in theyear1965,abb hasbeen among the pioneers of this technology. Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a. Gas insulated substation uses sulfur hexafluoride sf6 gas which has a superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation.
Is there any other differences, advantages or disadvantages between ais and gis. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. Over 2,000 stations with more than 10,000 switch bays demonstrate their. Sf6insulated 110kvswitchbay in theyear1965,abb hasbeen among the pioneers of this technology. With gis experience spanning 50 years across a wide range of industries and applications, ge is a leader in the. 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. A gas insulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation.
Stepping down the voltage from transmission to the distribution level at the substations located near the actual consumers not only yields economic advantages, but also ensures reliable power supply. There are some drawbacks that may occur in gis, but with many advantages. It will address regulatory, technical and business considerations for gis. Gas insulated substation market research report global. Gis highvoltage gas insulated switchgear substations. A gis is a high voltage substation in which the major conducting structures are contained within a sealed environment with a dielectric gas known as sulfur hexafluoride gas sf6 as the insulating medium. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. Gis substations use sf6 gas that reduces the distance needed between active and nonactive switchgear parts, resulting in smaller overall space requirements. The increase in demand for electricity and the growing energy density in metropolitan cities have made it necessary to extend the existing high voltage network right up to the consumer. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations.
Nov 04, 2017 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. It is suitable for both indoor and outdoor applications. The following are the main advantages of gas insulated substations over air insulated substations and hybrid substations. Distribution of electrical power using gis ijareeie. Its a colorless, odorless, nontoxic, liquified gas.
Gis gas insulated substations by hermann koch pdf although this novel on gis is fresh, theres quite a lengthy record of how it all started. Technology progress in highvoltage gasinsulated substations article pdf available in ieee potentials 296. Gas insulated substations gis primarily use sulphur hexafluoride gas. The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. Interruption of fault currents in the case of large shortcircuit currents, the gas between the arcing contacts 1 and 7 is heated by the arc energy. If you also have great articles like his, feel free to send us a mail. According to the author gis are much more reliable, compact and maintenance free.
Nowadays the range of highvoltage applications includes several series of modular gas insulated substations gis for rated voltages of between 52 kv and 800 kv. Gas insulated substation gis advantages disadvantages. Gas insulated substations gis differ from air insulated substations. Gas insulated substation electrical substation insulator. Can be assembled at workshop and modules can be commissioned in the plant easily. Earthing switch slowoperating earthing switch are used for protection purpose when work is being done in the substation, but are operated only when it is certain that the highvoltage system is not energized. Gas insulated substation authorstream presentation. Introduction and applications of gas insulated substation. Introduction and applications of gas insulated substation gis. Hence, most preferred where area for substation is small eg. The highvoltage conductor forms the primary winding. Is that the highvoltage current carrying parts are within a metal enclosure and are held in a concentric configuration by cast epoxy spacer. Outdoor switch yards are more vulnerable to faults as it is. Pioneer and technology leader driving gis innovations.
Southern california public power authority awards abb order for gis substation project. Gasinsulated switchgear elk04 c, 145 kv xiangan torch substation, china english pdf leaflet protection cover for all types of position indicator english pdf leaflet gasinsulated switchgear enk, 72. A gas insulated substation gis is a substation that uses a superior dielectric gas, sulfur hexafluoride sf6,high voltage. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. There are five major considerations in the differences between the two high voltage substations. The speakers will discuss reliability and system planning implications for gas insulated substations. Gas insulated substation gis versus air insulated substation ais. Gas insulated substations advantages disadvantages. A gasinsulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. Although the initial cost of building a gis is higher than building an air insulated substation, the operation. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the. Siemens has developed outstanding expertise in the handling of sf 6 gas and can ensure that no gas is released during production, maintenance, and recycling.
Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a type 8dn9. Due to the gas enclosed design, gis is the most suitable. Some of the advantages and disadvantages of gas insulated substations gis are. Gasinsulated switchgear for substations introduction common characteristic features of switchgear installation because of its small size and outstanding compatibility with the environment, sf 6insulated switchgear gis is gaining constantly on other types. Gas insulated substations offer other advantages in addition to the reduced space requirements. Study of gas insulated substation and its comparison with air. An extremely careful selection of materials, an expedient design and a high standard of manufacturing quality assure long. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. Urban supply systems combining gis technology and hv cable are safe, re. This project greatly enhanced system reliability reconfiguring the station from a115kv air insulated straight bus to a 115kv gis ring. The siemens range of gasinsulated switchgear gis, for rated voltages from 72.
A typical gas insulated substation is shown in fig. Based on this, the gil can be seen as a passive highvoltage gasinsulated system with no active moving parts e. This course will provide an indepth introduction to gas insulated substations. Generally gas insulted substations gis are indoor type as it requires 110th of the space required for conventional substations. This sf6 gas insulated switchgear working principle is the biggest advantage in the working stability and development of miniaturization and it also without any maintenance for 30 years time. Occupies very less space 110th compared to ordinary substations. The clearance required for phase to phase and phase to ground for all equipment is.
The only purpose of the gil is electric power transmission. Number of outages due to the fault is less maintenance free. Introduction to gas insulated substations switchgears gis. Gas insulated substations gis are 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 sf6 modules filled with sf6 gas. As an optimal scheme of electrical power transmission, gas insulated transmission lineswitchgear gilgis possess tremendous advantages for conveying. Congestion of below grade utilities, site access and. It requires minimum floor space and building volume. Due to its enclosed construction, gas insulated substation is operable under.
Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a type. An introduction to gas insulated electrical substations. Nowadays the range of highvoltage applications includes several series of modular gasinsulated substations gis for rated voltages of between 52 kv and 800 kv. Gas insulated substation mainly used for a power transmission system or a substation system, of which outgoing bus bar is shortened to reduce consumption of the outgoing bus bar sulfur hexafluoride. Gasinsulated switchgear transmission products siemens. A gas insulated substation due to its modular construction and compact nature is a viable alternative to the conventional air insulated substation. Compactness of gis the space occupied by sf6 installation is only about 10% of that of a conventional outdoor substation.
Gas insulated vs air insulated substations electrical equipment. Since its introduction back in 1968, siemens has installed switch fields in all climatic zones of the earth, recording over 420,000 years of operation since. Sf6 gas insulated switchgeargis manufacturers and suppliers. A onestop, complete reference text on gas insulated substations gis, largecapacity and longdistance electricity transmission, which are of increasing importance in the power industry today. Pdf technology progress in highvoltage gasinsulated substations. For rated voltages below 420 kv, this cost advantage in the favour of sf6. Digital substations will be discussed, including benefits, design and technology. Jan 31, 2008 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 substations advantages disadvantages electrical. 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. Siemens has been a leader in this sector from the very start. Technology progress in highvoltage gasinsulated substations. There are various advantages of gas insulated substations over conventional substations yet there are a few problems associated with the switching operation in gas insulated substation.
Gis technology originated in japan, where there was a substantial need to develop technology to make substations as compact as possible. In gas insulated substation the highvoltage conductors, circuit breaker interrupters, switches, current transformers, voltage transformers and lightning arresters. Based on this, the gil can be seen as a passive highvoltage gas insulated system with no active moving parts e. They will compare substation safety and security using ais vs. 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. The new 500220 kilovolt kv gas insulated substation will dispatch 1. More space is required for outdoor substation when compared to indoor gas insulated substation gis. Gis substation also offers unique advantages over airinsulated applications. Gas insulated substations advantages disadvantages gas insulated substations gis. Gas insulated substations euci conference 2020 in anaheim. 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.
Details advanced and basic material, accessible for both existing gis users and those planning to adopt the technology. Gas insulated substation gis vs conventional outdoor substation ais by engr. Modeling and simulation of air insulated and gas insulated. Several crucial terms are for better understanding of the presented material. 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. Gis substation also offers unique advantages over air insulated applications. Figure 2 shows the layout of a gis substation based on single line. Gas insulated substation free download as powerpoint presentation.
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. Sf6 gas which has high dielectric property acts as insulating medium to the high voltage or extra high voltage substation equipment. As one of the leading manufacturers of medium voltage sf6 gasinsulated switchgeargis in china, orecco designed the gasinsulated switchgear for the secondary voltage distribution network in 6 different configurations. This online engineering course provides a basic overview of gas insulated substations gis and gis technology. Originally, and lots of decades ago, the technical prospects involved with creating gis industry criteria for ieee constructed a tutorial and introduced it in crucial ieee meetings and conventions. Recently, ac gis ratings have reached up to 1,100 kv rated voltage and. 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.
A brief case study of challenges encountered during the installation of 115kv gas insulated switchgear in downtown denver. And the availability and reliability of the gis substations are more compared to air insulated substations faults occurring chances of air insulated substation or conventional substations are more. No internal switching or breaking capability is needed. The gas insulated substation gis is a compact assembly consisting of multiple components enclosed in a metallic covering with compressed sulphur hexafluoride sf6 gas as an insulating. Despite of all the technical advantages of sf6 there is one shortcoming, that being.
A gas insulated substationgis is a substation that uses a superior dielectric gas, sulfur hexafluoride sf6,high voltage. The compressed arcquenching gas flows through the heating volume 11 into the contact gap and extinguishes the arc. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. Jan 02, 2014 gas insulated substation uses sulfur hexafluoride sf6 gas which has a superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation. Cities most reliable compared to air insulated substations. Gas insulated substation is a structured substation in a sealed environment with sulfur hexafluoride as the insulating. Vfto are generated mainly due to the closing and opening operation of the disconnector switch 6.
Gasinsulated substation article about gasinsulated. 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. The 20 chapters are written for engineers and present full overviews of each topic, with lists of further references. The general conclusion about the lcc advantages of ais versus gis. Economics between conventional and gas insulated substation.
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. Download gis gas insulated substations by hermann koch pdf. Global gas insulated substation market research report. Strict quality control and environmentfriendly products.
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. Pdf in the last two decades, the evolutionary development of gasinsulated. Comparison of gis and ais systems for urban supply networks. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the start. Gas insulated substations conference 2018 in washington dc. A gis is a high voltage substation in which the major conducting structures are contained within a sealed environment with a dielectric gas known.
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