In normal substation the clearances between the phase to phase and phase to ground is very large. Pdf in the last two decades, the evolutionary development of gasinsulated substationsswitchgear gis has resulted in higher integration of. Substation safety equipment and rail delta sama jaya sdn. Nesco has adopted the philosophy of installing open terminal air insulated substations. Pdf technology progress in highvoltage gasinsulated substations. Air insulated, gas insulated and mixed technology switchgear substations together with the essential secondary systems. Various factors affect the reliability of a substation, one of which is the arrangement of the switching devices. 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. Its modular design allows for a large variety of layout configurations. Switchgear and substations electrical engineering portal. Presented paper refers to service continuity of gas insulated substations, a topic which is also dealt in annex f of iec international standard no. What structural engineers should know about substation rigid bus design. Key words reliability, hvmv substations, gasinsulated switchgear gis, air. Gis there are two terms presented in iec gas insulated switchgear and ieee.
Economics between conventional and gas insulated substation. Abb substations with air insulated switchgear ais provide a costefficient and wellproven solution without compromising on reliability. The gis is highly reliable system, free of environmental hazards. The differences between air insulated substation engineering and gas insulated substation engineering are vast.
Arrangement of the switching devices will impact maintenance, protection, initial substation development, and cost. Compass means compact prefabricated airinsulated substation and includes all the high voltage functions of a single bay in just one module. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the start. Air insulated substation air insulated substations are the conventional switchgear substations which are been enacted since past decades. Study of gas insulated substation and its comparison with. Air insulated substations busswitching configurations. As the electricity demand is increasing day by day, the power companies are giving their active. 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. Gas insulated substation gis advantages disadvantages. Understand the role of hv airinsulated substation, and gain insight on transformers, circuit breakers, disconnectors, surge arresters and instrument transformers. The rated insulation level of switchgear and control gear shall be selected from the values given in tables 12.
This problem can be solved by using gas insulated switchgear technology. There are six types of substation bus switching arrangements commonly used in air insulated substations. The bus bars may be of either rigid type or flexible strain type depending upon the choice of the designer considering the overall suitability and economy of the substation to be installed. Additionally specialized substations such as ultra high voltage uhv, offshore substations for wind power plants and the use of gas insulated lines are included. A direct comparison of the component investment for identical switchgear configurations suggests that the gis variant is more costly than the air insulated switchgear ais solution. Easy to expand in case that space is not an issue excellent overview, simple handling and easy access. Airinsulated substation article about airinsulated. Gis substation also offers unique advantages over airinsulated applications. Gas insulated switchgear gis the compact design and small dimensions of gis make it possible to install substations of up to 550 kv right in the middle of.
With gis experience spanning 50 years across a wide range of industries and applications, ge is a leader in the. Air insulated substation,tower erection services,earthing. Apr 30, 2018 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 component. Best practices and considerations wednesday, january 31, 2018 featuring a waterfront substation site visit tuesday, january 30, 2018. Gas insulated substation free download as powerpoint presentation. Two disconnectors with their own motormanual drive.
As an alternative, a number of solutions are also available which combine. Although gas insulated substations gis have different specifications in proportion to air insulated substations, transformer failures related to lightning and switching are often reported in the gas insulated substation gis. For substation line end clamps the design of all line end clamps is such that once hooked over the bus bar they become self supporting whilst the operating screw is tightened or loosened. Substations play a crucial role in electricity distribution infrastructures as a part of the transmission and distribution systems, performing several core functions such as the transformation of voltage from high to low, or vice versa. A direct comparison of the component investment for identical switchgear configurations suggests that the gis variant is more costly than the airinsulated switchgear ais solution. Air insulated outdoor substations of open design are not completely safe to touch, and are directly exposed to the effects of the climate and the environment. This definitio n typically relates to high voltage switchgear and control gear. The design objective for the substation is to provide as high a level of reliability and flexibility as possible while satisfying system requirements and minimizing total investment costs. Ieee guide for bus design in air insulated substations. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate air insulated substation engineering and gas insulated substation engineering are vast. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. 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.
Airinsulated substation elearning ge grid solutions. Sep 29, 2009 various factors affect the reliability of a substation, one of which is the arrangement of the switching devices. Study of gas insulated substation and its comparison with air. Mar 18, 2014 sub stationsair insulated substations 1. A gas insulated substation due to its modular construction and compact nature is a viable alternative to the conventional air insulated substation. Our professionals hold expertise in meeting the demands of air insulated substation services. The metalenclosed gas insulated switchgear is made as to ensure the best possible relationship between design, used materials, maintenance effort and maintenance intervals. Every sub station is controlled by some experienced manpower, including one in charge,23 engineers, 45 technical staffs. Toshibas gas insulated substation gis is a compact and highly economical substation solution for electric utilities, commercial, and industrial applications in densely populated cities. 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. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the. 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. This paper presents a comparative analysis of gas insulated substation and air insulated substation. Due to this, large space is required for the normal or air insulated substation ais.
A space of gis as described in iec 62271203 as part of a gas isolated. A brief study of both the substations is carried out. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. Gas insulated substation gis vs air insulated substation. Layout of a typical 500 kv substation using airinsulated switchgear. We are engaged in providing various air insulated substation services, such as switchyard equipment panel erection and tower erection, earthing of sub station. The design of an air insulated substation starts with a basic work of selection of site which includes a large area of land and environmental conditions for the installation of substation 2. Iec 62271203 highvoltage switchgear and controlgear part 203. Our experience and capabilities for power delivery systems encompass overhead and underground lines and openair and gasinsulated substations, distribution networks and transmission system communication facilities. All types, whether sprung loaded or not should be applied by means of an operating socket attached to an insulated operating pole. Home technical articles ais air insulated substations. Gis is a kind of metal enclosed switchgear that means, all the equipments of the electrical switchgear are enclosed by gas tight metal enclosure and sf 6 gas is used as insulation between live parts of the.
Basic design and analysis of airinsulated substations. Technical specification construction of 3311 kv primary sub. Gas insulated substations transmission distribution. Due to its enclosed construction, gas insulated substation is operable under. Combined with a significantly reduced footprint and sf6 gas insulation, toshiba gis can operate in unconventional indoor spaces while maintaining its. 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. The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. Innovative compact 14512 kv indoor air insulated substations ais.
In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. Installation, maintenance, and end of life of a gasinsulated. Hello, this video is for comparing of gas insulated substation gis vs air insulated substation ais for urban and rural areas with discussion. The speakers will discuss reliability and system planning implications for gas insulated substations. The content of the book covers a range of substation topologies. Gas insulated substations are used where there is space for providing the substation is expensive in large cities and towns. One circuitbreaker with blk drive both single and threephase operation. Gas insulated substation market 2025 by types, application.
The substation layout is the disposition or arrangement of highvoltage equipment. There are five major considerations in the differences between the two high voltage substations. Gas insulated substation electrical substation scribd. Design using design manual, specifications, internal standards. Gas insulated substation ppt pdf 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.
They will compare substation safety and security using ais vs. 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. If the switchgear is sold to new owners, they must receive this document along with the. Presented paper refers to service continuity of gasinsulated substations, a topic which is also dealt in annex f of iec international standard no. Design of an airinsulated switchgear substation based on new technology. Preparing for the smart grid evolution the air insulated substation, with a capacity of 220 kilovolt kv, was deployed by abb in 2008. Urban supply systems combining gis technology and hv cable are safe, reliable and environmentally benign. It requires minimum floor space and building volume. An introduction best practices and considerations monday, january 29, 2018 postconference workshop gis commissioning. Compliance with all technical requirements all energize elements comply with the required clearances clearances verify compliance with the last requirements of the national electrical safety code or prepa diseno subw\copy of svc subst profile 2. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. 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. Specification and selection of main components for airinsulated. High voltage products compass compact prefabricated air.
Sub stationsair insulated substations linkedin slideshare. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. 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. Ieee 605 is a great source for substation rigid bus design. Substation engineering ais and gis substations beta. It is suitable for both indoor and outdoor applications. Understand the role of hv air insulated substation, and gain insight on transformers, circuit breakers, disconnectors, surge arresters and instrument transformers. Substation gas insulated switchyards our experience and capabilities for power delivery systems encompass overhead and underground lines and openair and gasinsulated substations, distribution networks and transmission system communication facilities. This presentation includes definitions of the various physical areas making up a power station, an air insulated substation, or a gas insulated substation.
Gis substations use sf6 gas that reduces the distance needed between active and nonactive switchgear parts, resulting in smaller overall space requirements. Comparison of gis and ais systems for urban supply networks. Siemens provides a wide range of services including the supply of complete packages of highvoltage. What structural engineers should know about substation. Ageing of the system impact on planning of the working. Pdf highvoltage and mediumvoltage hvmv substations typically. Southern california public power authority awards abb order for gis substation project. Gas insulated substations conference 2018 in washington dc. Due to the gas enclosed design, gis is the most suitable.
Gis substation also offers unique advantages over air insulated applications. There are five major considerations in the differences between the two high voltage. Gas insulated substation market industry analysis, share. Open air substations one type of substation is an open air substation, which is the traditional design that uses the insulation properties of ambient air as an external insulating medium. Gas insulated substation definitions and basics cedengineering. These substations are generally constructed in an open, nonenclosed, nonatmospherically controlled environment and can be built either outdoors or indoors. Jan 02, 2014 gas insulated substations are used where there is space for providing the substation is expensive in large cities and towns. The assembly of apparatus used to change some characteristice. Installation, maintenance, and end of life of a gas. Five differences between air insulated substations and gas. Nov 06, 2016 the differences between air insulated substation engineering and gas insulated substation engineering are vast. Ge provides a full range of gasinsulated substations gis for utilities and industries worldwide. A typical gas insulated substation is shown in fig. It covers rural transmission and distribution with airinsulated, outdoor substations up to 345 kv.
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