This article is an introduction to gas insulated substations. This has led the utilities to adopt conditionbased maintenance of the equipments rather than usual preventive maintenance being carried out at a fixed interval of time. 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. A major difference between conventional air insulated substations ais and the gas insulated substations gis is that the sf6 gas insulated electrical. Several crucial terms are for better understanding of the presented material. Guidelines for usage of air insulated substation ais or gas. Gasinsulated substations high flexibility of its solutions modularity, expandability compact space saving solutions. Gas insulated substation electrical substation insulator. Outdoor gas insulated switchgear market size in 2016, was valued over usd 11 billion. Unified sf6 gas pressure throughout the switchgear makes simplified gas maintenance work. The quality of our gas insulated switchgear is the result of a rigorous standard quality management system, which has been certified in accordance with iso 9001. A gas insulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. If the switchgear is sold to new owners, they must receive this document along with the.
Pioneer and technology leader driving gis innovations. Gas insulated switchgear maintenance philosophy maintenance philosophy for gis type elk1, 2, 3 time based maintenance condition based maintenance criteria. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a minimum of cost. 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.
A gas tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance. This course is based on terms used in ieee and iec regulations. 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. Training, service, and maintenance of gasinsulated substations. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in sf6 gas inside grounded metal enclosures. With gis experience spanning 50 years across a wide range of industries and applications, ge is a leader in the. Operation and maintenance of a gas insulated substation a major difference between conventional air insulated substations ais and the gas insulated substations gis is that the sf6 gas insulated electrical components are. Gas insulated substation authorstream presentation. 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. Fast earth switch and maintenance earth switch are the two types of earth switches used for gas insulated substation systems. It is applicable to both openterminal air insulated ais and metalenclosed gas insulated gis substation constructions and covers equipment operated at lower voltages on the same substation site. They will compare substation safety and security using ais vs.
Air insulated substation ais air used as dielectric. Gas insulated switchgear up to 245 kv, 50 ka, 4000 a. They require protection against atmospheric pollution and moisture,noiseless operation, non explosive and flame resistant,reduced maintenance, minimal radio interference, but totally enclosed sf6 gas as insulation also known as gas insulated substation is now widespread in use. 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. 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 is employed where a where there is less space available b for high altitude substations c in terrain region d all the above. This functional specification covers all types of substation with equipment installed for use on 2, 275 and 400 kv 50 hz systems. Sf6 equipment maintenance, repair, and replacement and. Gas insulated substations conference 2018 in washington dc. Hand holes provide ready access to circuit breaker contacts and other key gis components for ease of inspection, maintenance, and.
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. Operation and maintenance of a gas insulated substation. Use of strong and big maintenance units should be able to recover gas to a resid al press re of insulated substations, gasinsulated substations, and gasinsulated lines. The metalenclosed gasinsulated switchgear is made as to ensure the best possible relationship between design, used materials, maintenance effort and. A typical gas insulated substation is shown in fig. Gis technology originated in japan, where there was a substantial need to develop technology to make substations as compact as possible. Pdf maintenance method based on risk estimation for 170kv gas. His the gasinsulated switchgear for indoor and outdoor use needs less than half of the space of a comparable airinsulated substation.
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 capacity of eot crane shall be decided based on lifting of heaviest parts of gis equipmentaccessories for erection and future maintenance purpose. Ge provides a full range of gasinsulated substations gis for utilities and industries worldwide. National grid substations technical specification ngts 2. Details advanced and basic material, accessible for both existing gis users and those planning to adopt the technology. Sf6 gas superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation preferred for voltage ratings of 72. Operation and maintenance customer training gasinsulated. Abstract the concept of the gas insulated switchgear gis preventive maintenance system construc tion, application examples, and new sensing technologies. Abb is a leader in highvoltage gis technology with a. 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. The metalenclosed gas insulated switchgear is made as to ensure the best possible relationship between design, used materials, maintenance effort and maintenance intervals. The differences between air insulated substation engineering and gas insulated substation engineering are vast. The gas insulated switchgear elk04 is the ideal solution for reliable energy supply up to a rated voltage of 170 kv, a rated normal current up to 4000 a, and a rated short circuit current up to 63 ka.
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. Jul 07, 2014 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. The course location is abbs training center in zurich, switzerland. Gastight barrier insulators ensure that any effect on adjacent substation components is kept to a minimum. Installation, maintenance, and end of life of a gasinsulated. Siemens provides a wide range of services including the supply of complete packages of highvoltage.
We believe that although many gis manufacturers produce a. Lsis has been a leader of development of industry and best partner to improve productivity for her customers by supplying reliable and stable energy lsis is producing gis, which is one of the major equipment used in the high voltage substation in densely cities. The individual modules are connected in such a way that subsequent expansion or the conversion of a substation can be carried out easily. Gasinsulated switchgear from siemens will support you with a largely maintenancefree, stable, and tested design for maximum availability even under extreme environmental conditions.
Less maintenance general to meet the customers various requirements of todays substations, we, hyosung, design and manufacture a wide variety of sf 6 gas insulated switchgeargis system. The speakers will discuss reliability and system planning implications for gas insulated substations. The maintenance earth switch is a slow device used to ground the high voltage conductors during maintenance schedules, in order to ensure the safety of the maintenance staff. Gas insulated switchgear gis refers to the general equipment of a substation in a metal enclosure filled with highinsulation sf 6 gas and connected to the ground, which includes a circuit breaker, disconnecting switches, earthing switches, and peripheral devices e. Preliminary operation before preventive maintenance 5 preventive maintenance operation details of ais substation and gis substation 2 dr. Gasinsulated 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. They are built for an estimated service life of more than 50 years. There are five major considerations in the differences between the two high voltage substations. Gis elk04 up to 170 kv gasinsulated switchgear abb.
Sf gasinsulated switchgear maintenance of circuitbreaker elk sl. Gas insulated substation electrical substation transformer. Maintenance method based on risk estimation for 170kv gas insulated switchgear. For voltages up to 8kv, the pipe can be filled with dry nitrogen gas highpressure gas filled, hpgf, though synthetic. Presented paper refers to service continuity of gas insulated substations, a topic which is also dealt in annex f of iec international standard no.
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. Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a type 8dn9. Sulphur hexaflouride sf6 gas the primary insulating medium. It can be installed in a small space in cities or buildings. Maintenance intervals are normally fixed on the basis of type of equipment and sometimes on the equipment history. Introduction to gas insulated substations switchgears gis. Major components you can spot while looking at hvehv gis. 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. The 8dq1type his is a compact switchgear solution for a rated voltage of up to 550 kv. Mv primary gasinsulated switchgear zx2 december 10, 2019 slide 11 are you looking for a safe, reliable and compact switchgear design. Gasinsulated switchgear transmission products siemens. Oversees the maintenance, repair and oversees the purchase and storage of ltfsf6 it sf6 replacemen t of sf6 gas equipmen.
A bus coupler circuit breaker is utilized in a substation for a joining the transmission line with station busbar b joining main and transfer bus in a substation. Gas insulated substation free download as powerpoint presentation. Gis highvoltage gas insulated switchgear substations. This article is an introduction to gasinsulated substations. 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. Flexibility to operate in harsh climatic conditions along with easy planning of outages for service and maintenance will make its adoption favorable. Conference paper pdf available september 2015 with 743 reads. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. During operation, siemens gis are practically maintenancefree. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation.