Expertise gas insulated substations, transmission lines. High voltage utility applications including transmission system expansions, rebuilds, and specialty projects industrial substations connect industrial facilities to the high voltage grid. The start of the book presents the theory of gas insulated technology, and outlines reliability, design, safety, grounding and bonding, and factors for choosing gis. Insulating supports called insulators are required at the points where they are supported by utility poles or transmission towers. Gasinsulated transmission lines power transmission lines. Highvoltage direct current transmission systems hvdc grid access solutions. The gasinsulated transmission lines gil of the second generation are now in services since more than 2 years, with very good service experiences. This content was uploaded by our users and we assume good faith they have the permission to share this book. Gil are used for both underground and overhead transmissions. Gasinsulated transmission lines gil is an established high voltage technology used when environmental or structural considerations restrict the use of. It presents specific information on gil technology for future. Gil consists of tubular aluminium conductors encased in a metallic tube that is filled with a mixture of sulphur hexafluoride and nitrogen gases for electrical insulation.
Overhead conductors for highvoltage electric power transmission are bare, and are insulated by the surrounding air. Our expertise has been applied to design substations, switchyards, transmission. 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. The transmission losses are related to the square of the transmitted current as pv i2 r i current, r resistance. Gas insulated transmission lines gil are a means of bulk electric power transmission at high and extra high voltage. Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. Secondgeneration gasinsulated lines for high power transmission are the best option where environmental or structural considerations rule out the use of overhead transmission lines. It is a usual practice by many electrical utilities to prepare oneline diagrams with.
With an overview on the technical, economical and environmental impact and power system implications of gil. A global leader in highvoltage sf6 gas insulated bus systems. 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. One key product in this support has been the underground transmission systems reference book, which was originally published in 1992. Gas insulated transmission lines gil is an established high voltage technology used when environmental or structural considerations restrict the use of overhead transmission lines. Today, dc transmission technology is entering a new era, whereby rather densely populated areas are being firmly looked at with the desire of nonvisibility transmission lines. 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. When the current rating is high as it is for gil e. Mar 15, 2015 gas insulated transmission linesgil 1.
Gasinsulated transmission lines consist of two concentric aluminum tubes. Gil are good alternative for transmission of extra high voltageehv. The gas insulated transmission line gil was invented in 1974 to connect the electrical generator of a hydro pump storage plant in schluchsee, germany. The increase in demand for electricity and the growing energy density in metropolitan cities have made it necessary to extend the existing high voltage network right up to the consumer.
Hermann koch the book provides power engineers with information on the best use of gil and its technical, economical and environmental impact. With an overview on the technical, economical and environmental impact and power system implications of gil, this guide provides a complete. Insulators are also required where the wire enters. 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. 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.
As vacuum technology is not available for high voltage, so for gis or gas insulated switchgear system above 72. Apart from other benefits during construction and operation. The term insulator is also used more specifically to refer to insulating supports used to attach electric power distribution or transmission lines to utility poles and transmission towers. Oct 28, 2011 gasinsulated transmission lines gil is an established high voltage technology used when environmental or structural considerations restrict the use of overhead transmission lines. The third chapter presents the technology, covering the following in detail. Small, medium and large diameter steel pipes are available however, the high strength of steel makes bending and forming more difficult. This is distinct from the local wiring between highvoltage substations and customers, which is typically referred to as electric power distribution. Gas insulated transmission lines gil wileyieee press. Dc gasinsulated transmission lines dc gil provide a powerful solution for. With a compact system design, fabricated elbows and a large current capacity, gil offer complete system flexibility. Evaluation of gas insulated lines gil for long distance. The gil went into service in 1975 and has remained in service without interruption since then, delivering peak energy into. Transmission and distribution substations pamphlet english. An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances.
Often, building new substations or increasing capacity is. The losses through the insulating gas are negligibly small. Highvoltage power transmission energy siemens global. The gasinsulated transmission line gil is a system for the transmission of electricity at high power ratings over long distances. Abb substations with gasinsulated switchgear gis are unmatched when it comes to compactness, reliability, efficiency and safety, ensuring maximum power availability for utility, commercial and industrial customers. 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. Gas insulated substations euci conference 2020 in anaheim.
Transmission network development historical development of gil history gas. Inspired by a new revival of worldwide interest in extrahighvoltage ehv and ultrahighvoltage uhv transmission, high voltage engineering merges the latest research with the extensive experience of the best in the field to deliver a comprehensive treatment of electrical insulation systems for the next generation of utility engineers and electric power professionals. Azzs sf 6 gas insulated transmission line gil deliver economical longdistance power transmission, with superior reliability and a longer lifecycle to reduce ownership costs. Published in the first edition with a green cover, the book has become commonly known throughout the industry as the green book. Gil system first installation in black forest as long ago as 1975 of about 4km. Ge has 50 years of expertise in gil solutions and has installed more than 200 km. Comprehensive reference covering all aspects of gas insulatedsubstations including basic. Gas insulated transmission lines successful underground. A computer model of gil has been built using the electromagnetic transient program emtp to assess the suitability of. Transmission lines may also be dispersive, which means the propagation velocity on the line is not constant with frequency for example the frequency components of square wave recall odd harmonics only each propagate at a different velocity, meaning the waveform becomes smeared dispersion is very important to high speed digital transmission.
The gas insulated transmission line gil is a system for the transmission of electricity at high power ratings over long distances. May 15, 2016 gas insulated line gas insulated line invented in 1965 by massachusetts institute of technology. The gasinsulated transmission line gil was invented in 1974 to connect the electrical generator of a hydro pump storage plant in schluchsee, germany. Pioneer and technology leader driving gis innovations. Faced with increasing demands for reliability, improved aesthetics and security, the adoption of gas insulated substations gis by north american utilities is rapidly increasing. Gas insulated transmission lines gil pdf free download epdf. In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. Stepping down the voltage from transmission to the distribution level at the substations located near the actual consumers not only yields economic advantages, but also ensures reliable power supply. Conductors for lower voltages in distribution may have some insulation but are often bare as well. A gas insulated transmission line having an inner conductor disposed within a cylindrical outer sheath. Gas insulated transmission linesgil linkedin slideshare. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. This problem can be solved by using gas insulated switchgear 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. A novel partial discharge detection method based on the photoelectric fusion. Azz designs and supplies the interface to any substation equipment, regardless of whether the substation interface equipment is supplied by azz or by others. A spacer assembly for supporting the transmission line comprises two members which fit over the inner conductor and which together surround the inner conductor. Gil consists aluminium conductor surrounded by mixture of n2 and sf6 inside the enclosure. Gas insulated transmission linessuccessful underground. Gas insulated transmission lines gil are a means of bulk electric power transmission at extra high voltage. It consists of one or more conductors commonly multiples of three suspended by towers or poles. A substation is a part of an electrical generation, transmission, and distribution system. Gasinsulated transmission line gil system design on photo tunnellaid gil by siemens the conductor rests on cast resin insulators, which center it within the outer enclosure. 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. 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.
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 two members are secured together by a curved plate, and the entire assembly can be disposed within the outer sheath to support. More concrete user benefits and solutions for intelligent, digitally controlled power transmission and distribution. Ge has 50 years of expertise in gil solutions and has installed more than 200 km of lines throughout the world. Download citation gas insulated transmission lines gil the gil is a transmission system for the transmission of high power levels over long distances. 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. Connections to air insulated substations and transmission lines are easily accomplished through the use of sf 6. Concept of gil g gas insulated transmission lines gil are a means for bulk power transmission at extra high voltage ehv, e.
They support the weight of the suspended wires without allowing the current to flow through the tower to ground. He is currently a professor and serving as chair of the department of electrical and computer engineering at famufsu college of engineering and the associate director of center for advanced power systems at florida state university where he also leads a. The interconnected lines which facilitate this movement are known as a transmission network. Gas insulated transmission lines gil wileyieee press books. Thermally insulated steel pipelines are extremely important for oil and gas industry. Gas insulated substations ebook, pdf portofrei bei. This enclosure is formed by a sturdy aluminum tube, which provides a solid mechanical and electrotechnical containment for the system. Jan 02, 2019 sf 6 gas pressure for insulating purpose is generally kept below 2.
The first mixedgasinsulated power transmission line in the world successfully completed its field trials with an endurance test in early 1999. Direct current gasinsulated transmission lines semantic scholar. With an overview on the technical, economical and environmental impact and power system implications of gil, this guide provides a complete understanding of its. 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. In recent years, wind and solar farms have comprised a significant portion of the new generation capacity. Pdf gas insulated transmission lines in railway galleries. Special application cablesgasinsulated lines, dc cables and longlength. Gasinsulated transmission lines gil are the safe and flexible alternative to.
Gas insulated transmission lines linkedin slideshare. Thus, the design of a gas insulated transmission line is an optimization of the dielectric, ampacity and material costs. The outstanding features of a gil system are its high transmission capacity, superior electromagnetic compatibility emc to any other trans. Insulated transmission lines gil wiley online books. 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. Companies also elect to use gis because of the increased load and limited space present in the urban areas. The historical development of gils is reported in table. The first step in planning a substation layout is the preparation of a oneline diagram, which shows in simplified form the switching and protection arrangement required, as well as the incoming supply lines and outgoing feeders or transmission lines. Since most of the insulation is provided by air, overhead power lines are generally the lowestcost method of power transmission for large quantities of. Introduction to gil gil are composed of pipes that houses conductors in sf6 gas.
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