With a compact system design, fabricated elbows and a large current capacity, gil offer complete system flexibility. Beta engineering has expertise in switchyards, high voltage substations and switchyards, gis and facts. Highvoltage sf6 gas insulated busbars is the most advanced and innovative solution in the area of busbar systems for electric power industry. Extreme low emissions protect the environment stateo eart design gas compartment axial direction. Gil system first installation in black forest as long ago as 1975 of about 4km. Gas insulated technology, power transmission, siemens, erlangen, germany. This is different to overhead lines and therefore, the gil has a different basis for the insulation coordination compared to gis for overhead lines. Gas insulated transmission lines gil are a means of bulk electric power transmission at high and extra high voltage. Gil are used for both underground and overhead transmissions. Gas insulated transmission line basically gas insulated transmission line gitl comprises of four main component s in its construction viz. 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. The transmission line is a twoport circuit used to connect a generator or transmitter signal to a receiving load over a distance. Gil consists aluminium conductor surrounded by mixture of n2 and sf6 inside the enclosure. 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.
Gas transmission lines size pressure class 2, 3, 4 class. There are nonshielding methods, such as use of lightning arresters and spark gaps. Moreover, it is possible to combine highpower transmission with roads and. Gas transmission lines size pressure class 2, 3, 4 class 1. Mar 15, 2015 gas insulated transmission linesgil 1.
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. Responsible for technical support in sales, development of gasmixture technologies like gil, business development for gis and gil and for coordination of siemens standardization activities on energy. Iec 62271203 highvoltage switchgear and controlgear part 203. Pdf available in ieee transactions on power delivery 202. Gas insulated transmission lines do not have these problems, as the insulating medium is.
Responsible for technical support in sales, development of gasmixture technologies like gil, business development for gis and gil and for coordination of siemens standardization activities on energy transmission division. A typical gas insulated substation is shown in fig. Substation equipment an overview sciencedirect topics. As vacuum technology is not available for high voltage, so for gis or gas insulated switchgear system above 72.
The two members are secured together by a curved plate, and the entire assembly can be disposed within the outer. An insulation spacer for supporting a high voltage conductor within a flexible housing which is filled with electronegative gas has a central insulation hub and a concentric outer rim which are joined by a thin web. Connections to air insulated substations and transmission lines are easily accomplished through the use of sf 6. Overhead lines and substation equipment can be protected against direct strokes to a considerable extent by using earth or ground wires, which shield the equipment.
Introduction to gil gil are composed of pipes that houses conductors in sf6 gas. Gas insulated transmission lines do not have these problems, as the insulating medium is gas and there is no need for physical layers of insulation, and gil is becoming more and more popular as a means of high and medium voltage transmission in restricted areas. Aug 09, 2015 over head transmission lines are not just a simple copper wire but it is actually a combination of aluminium and steel i. Apart from other benefits during construction and operation. Rbcgil sf6 busbars busbars gil are intended for power transmission with the voltage varying from 110 kv to 1,200 kv, rated current of up to 8,000 a. Compact gasinsulated systems for high voltage direct. With an overview on the technical, economical and environmental impact and power system implications of gil, this guide provides a complete understanding of its. No integration in transmission grid planned yet gil technology has been around for years and can in highvoltage substations as well as highvoltage connections.
Design and testing uwe riechert, ueli straumann abb. Us4263476a insulation spacer for gasinsulated transmission. Problems in the pipeline natural gas transmission systems. The gas insulated metal enclosed transmission line gil is a new type of power transmission device that was derived from the sf6 insulated metalenclosed bus, and it denotes an ideal solution to. Gas insulated switchgear for medium voltage substations, iee colloquium on gis at transmission and distribution voltages, pp. Ges gasinsulated lines gil are fieldproven to meet the challenges of electrical networks up to 800 kv for a variety of applications including distribution, transmission, power generation and heavy industry. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate 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. Gas insulated transmission lines in railway galleries. Experiences with gas insulated transmission lines gil back in the 1960s, with the introduction of sulphurhexafluoride sf 6 as an insulating and a switching gas, the basis was found for the development of metalclad high voltage substations on the basis of these developments and good experience of the sf 6 insulated metalclad high voltage switchgear, the idea to use high. 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. The paper deals with the possibility of installing a doublecircuit gas insulated transmission line gil in the pilot tunnel of the planned new railway galleries bolzanoinnsbruck.
Robin gremaud abb corporate research badendaettwil, switzerland magnus callavik abb power systems grid system vasteras, sweden. 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. May 15, 2016 gas insulated line gas insulated line invented in 1965 by massachusetts institute of technology. 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. Sf6 gas insulated lines a global leader in highvoltage sf6 gas insulated bus systems azzs sf 6 gas insulated transmission line gil deliver economical longdistance power transmission, with superior reliability and a longer lifecycle to reduce ownership costs.
In several responsibilities he was engaged in gas insulated technologies for hv circuit breaker, gas insulated substations and 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. No overvoltages can enter the gil through the enclosure. Download citation direct current gasinsulated transmission lines the technology behind dc power transmissions shows an everincreasing usage. Us06082, 19791005 19791005 insulation spacer for gas insulated transmission line with improved outer rim structure expired lifetime us4263476a en priority applications 1 application number. Gas insulated transmission lines gil provide technical. Thus, the design of a gas insulated transmission line is an optimization of the dielectric, ampacity and material costs. Also the appli cation of special energy tunnels over long distances will be explained. Gas insulated transmission linesgil linkedin slideshare. Over head transmission lines are not just a simple copper wire but it is actually a combination of aluminium and steel i. Gas insulated transmission line gil is a system for the transmission of high voltage electricity for long distance. Gas insulated transmission lines linkedin slideshare.
Concept of gil g gas insulated transmission lines gil are a means for bulk power transmission at extra high voltage ehv, e. Gas transmission lines size pressure class 2, 3, 4 class 1 offshore less than or equal to 8 inches less than 100 psig na na intervals prescribed by operator greater than 100 psig and less than 20% smys 10 year intervals na intervals prescribed by operator greater than 20% smys 5 year intervals na intervals prescribed by operator. The gasinsulated transmission line gil was invented in 1974 to connect the electrical generator of a hydro pump storage plant in schluchsee, germany. The gas insulated transmission line is an electrically closed system. Azzs sf 6 gas insulated transmission line gil deliver economical longdistance power transmission, with superior reliability and a longer lifecycle to reduce ownership costs. Sf 6 gas pressure for insulating purpose is generally kept below 2.
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. The outstanding features of a gil system are its high transmission capacity, superior electromagnetic compatibility emc to any other trans. Gil are good alternative for transmission of extra high voltageehv. Expertise gas insulated substations, transmission lines. The t210 is one of the most compact gis solutions available at 800 kv with a footprint 65% below. At the moment, tennet only uses gil technology at highvoltage substations. Gasinsulated transmission lines gil is an established high voltage technology used when environmental or structural considerations restrict the use of overhead transmission lines. Gas transmission lines size pressure class 2, 3, 4 class 1 offshore less than or equal to 8 inches less than 100 psig na na intervals prescribed by operator greater than 100 psig and less than 20% smys 10 year intervals na intervals prescribed by operator greater than 20% smys 5 year intervals na intervals prescribed by operator greater. Gas insulated transmission lines in railway galleries conference paper pdf available in ieee transactions on power delivery 202. Gasinsulated transmission lines cable to overhead line transition stations based on insulation coordination studies, test values were. Transmission lines are one of the safest and most effective ways of transporting crude oil, natural gas and petroleum products between border sharing nations and states. The industry jargon for pipelines vary with respect to the oil and gas. Thus the transmission lines are necessary for efficient electricity delivery.
Rbcgil sf6 busbars busbars gil are intended for power transmission with the voltage varying from 110 kv to. Responsible for technical support in sales, development of gas mixture technologies like gil, business development for gis and gil and for coordination of siemens standardization activities on energy. When the current rating is high as it is for gil e. Electric power transmission is the bulk movement of electrical energy from a generating site. Compact gasinsulated systems for high voltage direct current. This makes them a top solution especially for cavern hydropower plants, where large amounts of energy have to be transmitted from the underground machine transformer to the switchgear and overhead line on the surface. Ges t210 gis is a fieldproven solution with high availability that meets the challenges of networks up to 800 kv for power generation, transmission, distribution, tertiary and heavy industry applications. Gasinsulated transmission lines gil is an established high voltage technology used when environmental or structural considerations restrict the use of. Gas insulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate gas compartment tt f th td i 01% t t. It is an alternative of the overhead transmission line system without affecting the transmission capacity and low electrical losses compared to the other transmission systems overhead lines and cables. Modern equipment is being used in the installation of transmission lines. Shielding methods do not permit an arc to form between the conductor and ground. The gasinsulated transmission lines gil of the second generation are now in services since more than 2 years, with very good service experiences. Design and testing uwe riechert, ueli straumann abb technology centre high voltage products zurich, switzerland email.
The losses through the insulating gas are negligibly small. Ge has 50 years of expertise in gil solutions and has installed more than 200 km of lines throughout the world. Ges gas insulated lines gil are fieldproven to meet the challenges of electrical networks up to 800 kv for a variety of applications including distribution, transmission, power generation and heavy industry. Compact gasinsulated systems for high voltage direct current transmission. Similar to bus sections and the busbar arrangements on gis, gil principally consists of tubular aluminium conductors. The gas insulated transmission line gil is a system for the transmission of electricity at high power ratings over long distances. Gas insulated transmission lines gil pdf free download epdf. 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. The transmission losses are related to the square of the transmitted current as pv i2 r i current, r resistance. Pdf, 69 kb 230, 000 and 345, 000volt lines typically require a 150foot corridor. Problems in the pipeline natural gas transmission systems hum and flutter purpose inform and engage the public about a deleterious phenomenon of low and extra low frequency sound waves occurring in our communities from the operations of high pressure natural gas transmission systems known as flutter and hum that ferc refuses to deal with.
The gasinsulated metal enclosed transmission line gil is a new type of power transmission device that was derived from the sf6 insulated metalenclosed bus, and it. A global leader in highvoltage sf6 gas insulated bus systems. A plurality of tapered ribs extend from the outer rim to reinforce the outer rim against high loading forces and extend for approximately twothirds of the radial thickness of. Pdf gas insulated transmission lines in railway galleries. Report on saving potentials in energy transmission and. High voltage utility applications including transmission system expansions, rebuilds, and specialty projects industrial substations connect industrial facilities to the high voltage grid. The feasibility study of the 420 kv gas insulated transmission line with an insulating gas mixture of n 2 sf 6 has been proven as an ecological and economical alternative to overhead lines in areas where they cannot be built and to synthetic cables, where high power ratings andor long distances are needed. Azz designs and supplies the interface to any substation equipment, regardless of whether the substation interface equipment is supplied by azz or by others. Hv gasinsulated transmission lines for rated voltages of 72. 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 is a system for the transmission of electricity at high power ratings over long distances. Voltage regulation of gas insulated transmission line and. Since overhead transmission wires depend on air for insulation, the design of these lines. Gas insulated transmission lines for high power transmission. G gas insulated transmission lines gil are a means for bulk power transmission at extra high voltage ehv, e.
In several responsibilities he was engaged in gas insulated technologies for hv circuit breaker, gasinsulated substations and transmission lines. Environmentalfriendly gas insulating medium adapted to dc gasinsulated transmission line gil electric field conditions is the key to the next generation of environmentalfriendly hvdc gils. Case study 80 ka gas insulated substation bergen switching. Secondgeneration gasinsulated lines for high power transmission are the best option where environmental or structural considerations rule out the use of overhead transmission lines. Gasinsulated tubular conductors can be installed without a problem at any gradient, even vertically. Evaluation of gas insulated lines gil for long distance. 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. Direct current gasinsulated transmission lines researchgate.
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