This paper presents a comparative analysis of gas insulated substation and air insulated substation. 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. Pdf lightning performance of an air insulated high. Technoeconomic comparison between gas insulated substation gis and air insulated substation ais. Gas insulated substation electrical substation transformer. Ivo uglesic1, sandra hutter1, viktor milardic1, igor ivankovic2, bozidar filipovicgrcic2. 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. This document supports the power system safety rules and its requirements assembled under work in substations general. Gis is different from that of the conventional substation because of certain unique. This course is based on terms used in ieee and iec regulations. Recommendation for improving substation availability english pdf leaflet. 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.
Abbs innovative hybrid substations combine gas and airinsulated switchgear. According to manufacture manual, fresh oil can normally be expected to have a dielectric. For substations contracted on turnkey basis the substation contractor shall be responsible for design, material supply, transport, erection, and installation and commissioning as well as. Siemens transmission products presentation digital asset. Distribution substation a distribution substation transfers power from the transmission system to the distribution system of an area. Most flexible conductors used in substation construction consist of all copper, all aluminum, or aluminum with steel reinforcing acsr.
There are five major differences between airinsulated substation engineering and gasinsulated engineering. Abb substations with air insulated switchgear ais provide a costefficient and wellproven solution without compromising on reliability. Excellent insulating stress control using fine graded bushings. Several crucial terms are for better understanding of the presented material. This course will give you an appreciation of how to design this type of substation and introduce you to all of the equipments that you will find in a typical air insulated substation.
Operation and maintenance of a gas insulated substation. Gis highvoltage gas insulated switchgear substations. A proper design of the substation bus ensures a safe and reliable operation of the substation and the power system. The assembly of apparatus used to change some characteristice. Gis there are two terms presented in iec gas insulated switchgear and ieee. It details the electrical hazards which must be managed to ensure the safety of personnel when working in switchyards, substations, high voltage areas including cable tunnels, general. 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. Pdf electric power substations engineering by john d. Ieee std 6052008, ieee guide for bus design in air. Mcdonald the use of electric power substations in generation, transmission, and distribution remains one of the most challenging and exciting areas of electric power engineering. The current work deals with the lightning performance of air insulated high voltage substations. Distribution voltages are typically medium voltage, between 2.
Providing power to the customer has become an increasingly challenging task for system operators. Switchgear and substations electrical engineering portal. Substation design volume ii physical layout table of contents. Elimination of sf6 from transmission system equipment. The major substation costs are reflected in the number of power transformers, circuit breakers, and disconnecting switches and their associated structures and foundations. Air insulated substations are the most common type of substation that you will find on the electrical network, due to their cost effectiveness and simplicity. 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. Gas insulated substations euci conference 2020 in anaheim. What structural engineers should know about substation rigid bus design. Substations rely on copper grounding on equipment and in the ground to properly ground the system and make it safe. The input for a distribution substation is typically at least two transmission or subtransmission lines.
Technical specification 4124 issue 2, november 2018. Siemens provides a wide range of services including the supply of complete packages of highvoltage. 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. The badr turnkey substation, which came online end of september 2017, will play a strategic role in the. While also considering the cost of equipment, labor, and land, every effort must be made to select a substation type that will satisfy all requirements at minimum costs. 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.
Details advanced and basic material, accessible for both. As the electricity demand is increasing day by day, the power companies are giving their active. Ieee guide for bus design in air insulated substations. Is that the highvoltage current carrying parts are within a metal enclosure and are held in a concentric configuration by cast epoxy spacer.
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. Ena technical specification 4124 issue 2 november 2018 page 4 5. In new substations and when replacing transformers or increasing transformer capacity, the. Download draft guide for bus design in air insulated substations book pdf free download link or read online here in pdf. The design of power substation is classified as air insulated substation and gas insulated substation where the air and. Gas insulated switchgear for substations sf 6 insulated switchgear up to 245 kv, type 8dn9 the clear bay configuration of the lightweight and compact 8dn9 switchgear is evident at first sight.
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. Air insulated, gas insulated and mixed technology switchgear substations together with the essential secondary systems. Air insulated substations up to 800 kv as the demand for electrical power grows, power companies worldwide are active to ensure power is available wherever and whenever it is needed. The content of the book covers a range of substation topologies. Insulation level bil required for a gas insulated substations. Distribution automation handbook prototype elements of power d istribution systems 1mrs757959 4 3 elements of power distribution systems 3. What structural engineers should know about substation.
This guide provides information on the different bus arrangements used in substations stating the advantages and disadvantages of each. National grid begins journey to sf6free hv substations. 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. Two different types of buses are used in substations, the rigid bus and the strain cable. This article is an introduction to gas insulated substations. Insulated substation due to disconnector switching. Optimal location of substations within power system load flow, shortcircuit, customer requirements, long term planning, land space selection of substation design calculation of shortcircuit currents and long term development ratings selection of power system requirements. Draft guide for bus design in air insulated substations. Control and monitoring facilities are easily accessible in spite of the compact design of the switchgear. Gas insulated substation definitions and basics cedengineering. Recent technological developments have had a tremendous impact on all aspects of substation design and operation. Standard for high voltage gas insulated substations rated above 52 kv. Gas insulated substations high system reliability highflexibilityofitssolutionsmodularityexpandability gas insulated 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. Planning of substations basis requirements for new substations.
The main bus shall be phase isolated and insulated from each other and from device load terminals. The study of the consequences due to an atmospheric. The contractor shall install double bus bar gas insulated with the following bays. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. In 1965 abb delivered the worlds first substation with gas insulated switchgear gis. However, over the last 30 years, gis at voltage up to 800 kv in various station. Distribution substations michigan technological university. A gas insulated substation gis is a substation that uses a superior dielectric gas, sulfur hexafluoride sf6,high voltage. The air insulated substation dissected plh group inc. As the electricity demand is increasing day by day, the power companies are giving their active participation in fulfilling the consumer demand. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a. Ieee 605 is a great source for substation rigid bus design.
According to the author gis are much more reliable, compact and maintenance free. 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 utility, commercial and industrial customers. This is a significant change in operating the switchgear with circuit breakers, disconnectors, and switches earth. Guide for sulphur hexafluoride sf 6 gas handling for highvoltage over v ac equipment. This introduction provides some background on the rationale used to develop this guide.
Covers the specifications and application of electrical cable. Tp comprising all products of hv substations including their. A brief study of both the substations is carried out. Airinsulated substations up to 800 kv digital asset management. Distribution substations may also be the points of voltage regulation, although on long distribution circuits several kmmiles, voltage regulation equipment may also be installed along the line. Airinsulated substations up to 800 kv siemens high. Gas insulated substation free download as powerpoint presentation. The development focus for ais was on circuit breaker cb technology that would increase reliability and reduce maintenance. This information is meant to aid in the understanding and usage of this guide. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation.
Complicated distribution substations can be found in the downtown areas of large cities. Gas insulated substation gis vs conventional outdoor substation ais by engr. All books are in clear copy here, and all files are secure so dont worry about it. Chapter 4 estimate of size of alternative gas insulated substations. Download electric power substations engineering by john d. 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. Read online draft guide for bus design in air insulated substations book pdf free download link book now. Gasinsulated highvoltage switchgear gis is a compact metal encapsulated. Transient over voltages under line fault conditions in. Additionally specialized substations such as ultra high voltage uhv, offshore substations for wind power plants and the use of gas insulated lines are included. This introduction is not part of ieee std 6052008, ieee guide for bus design in air insulated substations. The vertical buses shall be isolated and insulated from the main buses. Switchgear in transmission and distribution substations is not only used to control the power flow, but also to ensure that system failures and malfunctions remain.
Electromagnetic disturbances of the secondary circuits in gas. Pdf technoeconomic comparison between gas insulated. Gas insulated substations gis have been used in power systems over the last three decades because of their high reliability, easy maintenance, small ground space requirement, etc. Pdf environmentally friendly compact airinsulated high. 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. Guide for the application of gas insulated substations 1 kv to 52 kv. Introduction to gas insulated substations switchgears gis.
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