Determining the energy transfer through transmission lines and tie lines. The gas insulated transmission line gil is a system for the transmission of electricity at high power ratings over long distances. In gas insulated substation various power substation equipments like circuit breakers, current. Its a colorless, odorless, nontoxic, liquified gas. The transmission losses are related to the square of the transmitted current as pv i2 r i current, r resistance. The entire system will work at 380 kv service voltage. The project is expected to be complete in end of year 2018 including closeout. Comprehensive reference covering all aspects of gas insulated substations including basic principles, technology, use application, design, specification, testing and ownership issues this book provides an overview on the particular development steps of gas insulated highvoltage switchgear, and is based on the information given with the editors tutorial. Gil consists of tubular aluminium conductors encased in a metallic tube that is filled with a mixture of nitrogen and sulphur hexafluoride gases for electrical insulation. As a gasinsulated system, the gil has the advantage of having electrical behavior similar to an overhead line. The other type is a solid dielectric cable which requires no fluids or gas and is a more recent technological advancement. Long term test of buried gas insulated transmission lines.
They will compare substation safety and security using ais vs. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the start. The amount of the delivered electricity is dependent not only on the demand but also on the energy losses in electricity delivery process, which includes losses in both transmission and distribution lines. 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. Gas insulated substation gis market outlook 20172027. The gasinsulated transmission lines gil of the second generation are now in services since more than 2 years, with very good service experiences. Gas insulated transmission lines gil are an excellent means of transmitting power in such a way. Seminar on gas insulated substation linkedin slideshare. A spacer assembly for supporting the transmission line comprises two members which fit over the inner conductor and which together surround the inner conductor. This paper theoretically addresses the factors affecting the partial discharge activities due to metallic particles in hybrid gasinsulated transmission lines hgitl using the charge simulation method. Latest seminar topics for electrical engineering 2020.
The gasinsulated transmission line gil is a system for the transmission of electricity at high power ratings over long distances. Very high safety requirements with regard to fire protection. Gas insulated transmission line linkedin slideshare. A composite solution was proposed by churchill and usagi 1972 7 and used by goldstein and kuehn 1976 to build a model fittin data within the transition region. Gas insulated transmission lines gil provide technical, environmental and operational features which make them a very good alternative wherever the transmission of extra high voltage ehv and extra high currents ehc is needed within restricted space, e.
Morcos, an adaptive fuzzy selflearning technique for prediction of abnormal. Gas insulated transmission lines in railway galleries conference paper pdf available in ieee transactions on power delivery 202. Gas insulated substation presented by ajooba alam 1rnee004 eee, 8th semester under the guidance of mr. Project work report on autoreclosure for system stability on transmission and distributions lines during the line faults to keep the system continuous flow. Products connection of a 500kvohl to an underground gis with through a 480m deep shaft 2x240m. Thus the transmission lines are necessary for efficient electricity delivery. Tamara jenkins, program manager, seattle city light. With a compact system design, fabricated elbows and a large current capacity, gil offer complete system flexibility. A computer model of gil has been built using the electromagnetic transient program emtp to assess the suitability of gil and quantify the voltage, current. Pioneer and technology leader driving gis innovations.
This keeps moisture out of the cable and the overhead line away from the. Both, the gis located in the cavern and the underground section of the outgoing line are typical applications for gas insulated power transmission installations. Download full latest seminar topics for electrical engineering 2020 in doc, pdf or ppt format. Connections to air insulated substations and transmission lines are easily accomplished through the use of sf 6. In order to determine the particle trajectories in a gib, an inner diameter of 55 mm and outer enclosure diameter of 152 mm were considered. The insulated conductor of the overhead line is linked through a solid insulator device to the underground cable. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate may 15, 2016 gas insulated line gas insulated line invented in 1965 by massachusetts institute of technology. Underground electric transmission lines introduction this overview contains information about electric transmission lines which are installed underground, rather than overhead on poles or towers. The speakers will discuss reliability and system planning implications for gas insulated substations. Apart from other benefits during construction and operation. Report on saving potentials in energy transmission and distribution table of content. Gas insulated substations conference 2018 in washington dc. A global leader in highvoltage sf6 gas insulated bus systems.
Pdf gas insulated transmission lines in railway galleries. City light is in the process of permanently relocating the final section of 115 kv transmission lines. Data transmission via power line carrier for the purpose of network monitoring, control and protection. Compact gasinsulated systems for high voltage direct current transmission. 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. Seminar topics 2014 new topic list a technique for online detection of shorts in fields of turbine generator rotor. Pdf gas insulated transmission lines gil are a new technology for transmitting power over long distances. Srinivasa, characterization of partial discharges in a gas insulated system using an acoustic emission technique. Iec 62271203 highvoltage switchgear and controlgear part 203. Gas insulated substation gis or gas insulated busduct gib. Concept of gil g gas insulated transmission lines gil are a means for bulk power transmission at extra high voltage ehv, e. Download full seminar report on electrical engineering in doc, pdf or ppt format.
Mar 17, 2018 there are two main types of underground transmission lines currently in use. In cases where overhead lines are not possible, the gil is a viable technical solution to bring the power transmitted by an overhead line underground without a reduction of power transmission capacity. Dynamics increasing demand for high voltage from largescale industries, metropolitan cities and also increasing numerous high voltage projects are expected to drive the global gas insulated transmission lines market during the forecast period. The gasinsulated transmission line gil was invented in 1974 to connect the electrical generator of a hydro pump storage plant in schluchsee, germany. Pdf analytical calculation of coupled magnetothermal.
Secondgeneration gas insulated lines for high power transmission are the best option where environmental or structural considerations rule out the use of overhead transmission lines. What is gil gas insulated transmission lines gil are a means for bulk power transmission at extra high voltage ehv. Robin gremaud abb corporate research badendaettwil, switzerland magnus callavik abb power systems grid system vasteras, sweden. As a gas insulated system, the gil has the advantage of having electrical behavior similar to an overhead line.
A gas tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance. 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. The outstanding features of a gil system are its high transmission capacity, superior electromagnetic compatibility emc to any other trans. Compressed gas insulated transmission bus systems cgit westboro, inc. The delivery capability of the substation is dependent on the capacity of the transmission lines. The gas insulated transmission line gil was invented in 1974 to connect the electrical generator of a hydro pump storage plant in schluchsee, germany. Over the next few years, it is anticipated that the global gas insulated transmission lines market will grow with double digit cagr during the forecast period as gas insulated transmission line is a new, futureoriented technical solution for power transmission. Project work report on autoreclosure for system stability. Gas insulated transmission lines gil are a means of bulk electric power transmission at high and extra high voltage. Underground electric transmission lines introduction. Seminar report on electrical engineering seminar topics. The gil went into service in 1975 and has remained in service without interruption since then, delivering peak energy into the southwestern 420 kv network in germany. The 2nd generation gil is insulated with n 2sf 6 gas mixtures and the design and laying technique is primary dedicated to long distance transmission lines. A gas insulated transmission line having an inner conductor disposed within a cylindrical outer sheath.
Underground electric transmission seminar report pdf. 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. 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 details advanced and basic material, accessible for both existing gis users and those planning to adopt the technology. Securing supply by feeding the network at various points. Report on saving potentials in energy transmission and. Gil system first installation in black forest as long ago as 1975 of about 4km. Gas insulated transmission lines successful underground. When the current rating is high as it is for gil e. The project involves installing underground vaults, electrical duct banks, and gas insulated switchgear. There are two main reasons for using flexible hgitl. In the framework of this last region, for a rayleigh number between 10 6 and 10 9, the electrical gas insulated lines are designed. Advancements in inverter technology for industrial applications.
Underground cables have different technical requirements than overhead lines and have different environmental impacts. Gil consists aluminium conductor surrounded by mixture of n2 and sf6 inside the enclosure. Universal magneto resistive current sensor the measurement of electric current strength is not always easy, especially when the measured signal requires further electronic conditioning. Design and testing uwe riechert, ueli straumann abb. Cables or gas insulated lines or bus gil, gib substation layout outdoor substation check. A composite solution was proposed by churchill and usagi. Azz designs and supplies the interface to any substation equipment, regardless of whether the substation interface equipment is supplied by azz or by others. Design and testing uwe riechert, ueli straumann abb technology centre high voltage products zurich, switzerland email. Evaluation of gas insulated lines gil for long distance.
Fault analysis and pinpointing the cause and subsequent improvements. Ac cable versus shos cable transmission for offshore wind farms. One type is constructed in a pipe with fluid or gas pumped or circulated through and around the cable in order to manage heat and insulate the cables. Azzs sf 6 gas insulated transmission line gil deliver economical longdistance power transmission, with superior reliability and a longer lifecycle to reduce ownership costs. There are two main types of underground transmission lines currently in use. The losses through the insulating gas are negligibly small. Compact gasinsulated systems for high voltage direct current. A typical gas insulated substation is shown in fig.1410 720 1210 536 535 1345 487 173 850 524 1074 550 1509 1331 281 262 961 1256 390 167 864 677 1133 56 1402 456 796 1434 834 90 584 681 615 38 209 251 916 1460 569 1169 1422 457 1209 167 1022 1029 74 1445 724