The individual panels are to be connected by sf6 insulated, plugin bus bars inside the sf6 gas compartment. Also referred to as a solid insulated system sis, insulated copper bus bars are manufactured from solid copper or aluminum conductors, which have a solid insulating medium between each phase conductor and ground. Connection earth neutral corner piece for earth neutral connection, l 1750 mm. Busways, or bus ducts, are long busbars with a protective cover. Rather than branching from the main supply at one location, they allow new circuits to branch off anywhere along the route of the busway. 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. Xdge provides gas insulated switchgear gis solutions for high to ultra high voltage. Online sf6 monitoring breaking paradigms qualitrol. The third chapter presents the technology, covering the following in detail. In addition, the use of sf6 as insulating gas with its unique insulation features allow the realization of very compact switchgear designs. Read more about busbar configuration in a substation. Gis substation design and execution hv and ehv gis. 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. Gasinsulated switchgear up to 550 kv, 63 ka, 5000 a type 8dq1.
Gas insulated substations are having more advantages than air insulated substations. Training, service, and maintenance of gasinsulated substations. An electrical bus bar is defined as a conductor or a group of conductor used for collecting electric power from the incoming feeders and distributes them to the outgoing feeders. This course is based on terms used in ieee and iec regulations. 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. The various substation bus connections can be made by using any of four main methods bolting, clamping, compressing, and weldingdepending on the conductor type and material.
Gas insulated substation gis vs conventional outdoor substation ais by engr. A gis is the implementation, within a complete hv substation, of the remarkable sulphur. The substation bus tubing or bus bar is aluminum or copper. Sealed gis is safe to touch and inherently arcresistant. Moving contact system mounted on the enclosure of the main module and aligned to the fixed contact. Economics between conventional and gas insulated substation. In outdoor and hybrid substations, the occupied area is tremendously reduced by using gis technology. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. The earth switch is the smallest module of a gas insulated substation system. Single busbar is quite available as soon as redundancy is properly implemented.
The sf6 gas pressure in a circuit breaker is around 0. This problem is the voltage magnifications due to reflections of switching and lightning surges at various junctions within the gis. 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 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 switchgear 50 hz shall be complete with all necessary terminal boxes, sf6 gas filling, interconnecting power and control wiring, grounding connections, gas monitoring equipment and piping, support structures complete in all. With the advantage of sf6 gas insulating ability the interrupting arcs capability is 100 times more than air, gas insulated substation could operate in stable condition for. The author in his paper has made comparison of gas insulated substation. Gis gas insulated substations ais air insulated substations vft very fast transients. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. Gis gas insulated substation sf6 sulphur hexa fluoride gib gas insulated bus duct cb circuit breaker.
Mitigation of transient overvoltages generated due to. Gas compartment must be provided with gas pressure monitoring by pressure gauge with signaling contacts, to signal any increase drop of gas pressure. The sf6 gas insulated substation gis is assembled by several sf6 gas insulated switchgear configurations in an outdoor enclosure which could reach ip54 protection grade. Bus fault causes loss of the entire substation ring bus figure 5 depicts the layout of a ring bus configuration, which is an extension of the sectionalized bus. Sf 6 gas pressure for insulating purpose is generally kept below 2. An ais unit is basically a conventional switchgear technology where air is used as a primary dielectric for insulation. Aluminium bars for the aluminium bars of same dimensions as the solid bars. As there is an extremely low frequency of manual gis. Medium voltage gasinsulated switchgear up to 24 kv schneider. Jul 25, 2018 there are many different electrical bus system schemes available but selection of a particular scheme depends upon the system voltage, position of substation in electrical power system, flexibility needed in system and cost to be expensed. Several crucial terms are for better understanding of the presented material. In electric power distribution, a busbar also bus bar is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. Key property of ais unit is stepup systems in connection with power stations and. Overhead busbar design for 22066 kv gis substation prakruti shah1 and hetal desai2.
Next, the book goes into control and monitoring, which covers local control cabinet, bay controller, control schemes, and digital communication. Secocue 36v gas insulated medium voltage switchgear secocube is an indoor, factoryassembled, metalenclosed, cubicle type gas insulated switchgear for single busbar applications. Three phase encapsulated type sf6 gas insulated switchgear type sdf for 170 kv 06b1e0001 gate city ohsaki, east tower, 112, osaki 1chome, shinagawaku, tokyo 1410032, japan. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. Presented paper refers to service continuity of gas insulated substations, a topic which is also dealt in annex f of iec international standard no.
Lsis who has been a leader in electricity and automation in. Cities most reliable compared to air insulated substations. When the space available for the installation of the substation is short or when the environmental conditions are extremely severe the usual solution is to install a gis gas insulated substation, which schematic diagram is shown in figure 3. Xdge is one of the most reliable gas insulated switchgear suppliers with. 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. So the gis gas insulated substation is the best choice for the projects which is small space of compact design. Pdf gasinsulated substation service continuity researchgate.
The circuit breaker in a gas insulated system is metalclad and utilises sf6 gas, both for insulation and fault interruption. Various equipments like circuit breakers, bus bars, isolators, load break switches, current transformers, voltage. A bus bar also spelled busbar, buss bar or busbar, is a strip or bar of copper, brass or. 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.
The 420 kv sf6 gas insulated switch gear shall have one and a half breaker bus bar arrangement. Gasinsulated switchgear installation instructions no. Classification of vfto in high voltage gis substation. New mitigation methods for transient overvoltages in gas insulated. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. The power from gis was fed into two 100 mva transformer which stepped the voltage down to 66 kv.
Very fast transient over voltage vfto is a unique electromagnetic transient phenomenon occurring in gas insulated substation gis, which determines the. Connector for drillfree connection on the busbar bars for thickness 10 mm. Operation and maintenance of a gas insulated substation. If the switchgear is sold to new owners, they must receive this document along with the. 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. The basic insulation level bil required for a gas insulated substation gis is different from that of the conventional substation because of certain unique properties of the former. Fixed contact, which is located at the live bus conductor and which forms a part of the main gas insulated system. Gas insulated substation mainly used for a power transmission system or a sub station system, of which outgoing bus bar is shortened to reduce consumption of the outgoing bus bar sulfur hexafluoride. Substation configuration reliability 1 reliability of substation configurations daniel nack, iowa state university, 2005 introduction while one of the strongest points in a power system is the electric substation, it still contains what could be described as weak points or points of failure that would lead to loss of load. Gis configurations can be applied to any type of bus bar arrangements. Guidelines for usage of air insulated substation ais or gas. Introduction to gas insulated substations switchgears gis. Vuspec page 3 ieee 12402000 r2012, ieee guide for the evaluation of the reliability of hvdc converter stations ieee 12462011, ieee guide for temporary protective grounding systems used in substations.
Single busbar, double busbar, single busbar with transfer bus, double busbar with double circuit breaker, one and a half circuit breaker scheme and. Mar 18, 2014 sub stationsair insulated substations 1. This work deals with the influence of gas insulated bus bar enclosure geometry on the power losses and temperature distribution of gas insulated bus bars of substations having separately enclosed bus bars, and since the. Thereby overvoltages in gis are more important than air insulated.
Transformer failures related to lightning and switching are often reported in the gas insulated substation gis. The circuit breaker is directly connected to either current transformers or the isolators in gas. Gas insulated substation electrical substation transformer. Electrical bus system and electrical substation layout july 25, 2018 february 24, 2012 by electrical4u there are many different electrical bus system schemes available but selection of a particular scheme depends upon the system voltage, position of substation in electrical power system, flexibility needed in system and cost to be expensed. This is a significant change in operating the switchgear with circuit breakers, disconnectors, and switches earth. Nov, 2016 gis substation bus bar part 1 pavan choudhary. With layout flexibility, the zf8550 gis consists of a circuit breaker. Scribd is the worlds largest social reading and publishing site. They are also used to connect high voltage equipment at electrical switchyards, and low voltage equipment in battery banks. Azz designs and supplies the interface to any substation equipment, regardless of whether the substation interface equipment is supplied by azz or by others. Highvoltage conductors, circuit breaker interrupters, switches, current and. Jan 26, 2018 this feature is not available right now.
Xdge provides gas insulated switchgear gis solutions for high to ultra highvoltage. Jan 02, 2019 sf 6 gas pressure for insulating purpose is generally kept below 2. 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. Nov 2003 connection to grid customers benefits project completed on time in spite of very tight schedule and unpredictably adverse conditions sars, weather. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. Sf6 gis gas insulated substation manufacturer in china. Iec 62271203 gas insulated metalenclosed switchgear for rated voltages above 52kv. Electrical bus system and electrical substation layout. Uses sulfur hexafluoride sf6, which is a superior dielectric, inert, non toxic, non flammable gas, at a moderate pressure 400 600 kpafor phasetophase and phasetoground insulation. Buffer compartment concept, activepassive busbar concept, location of earthing switches, temporary earthing facilities are analysed, too. Its a colorless, odorless, nontoxic, liquified gas. Bus bars are conducting bars to which a number of incoming or outgoing circuits are connected and each circuit connected to the bus bar will have certain. Product brochure gasinsulated switchgear type elk3 gis for maximum performance, 420 kv.
In a gis substation, the various equipment like circuit breakers, bus bars, isolators, load break switches, current transformers, voltage transformers, earthing switches, etc. Hence, most preferred where area for substation is small eg. Bus bar arrangement of substation electrical substation. Disconnect switches and other equipment are mounted on the steel structures. A bus coupler circuit breaker is utilized in a substation for a joining the transmission line with station bus bar b joining main and transfer bus in a substation. This equipment is a compact multicomponent assembly, enclosed in a ground metallic housing, which the primary insulation medium is a compressed gas. Gasinsulated switchgear up to 145 kv, 40 ka, 3150 a type series. Technical specification for gas insulated metalclad 36kv. In other words, it is a type of electrical junction in which all the incoming and outgoing electrical current meets. Connections to air insulated substations and transmission lines are easily accomplished through the use of sf 6.
Now there is a closed loop on the bus with each section separated by a circuit breaker. Product brochure gasinsulated switchgear type elk3 gis. The bus bars are conducting bars to which various incoming and out going bars are connected. Sf6 gas superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation preferred for voltage ratings of 72. The assembly of apparatus used to change some characteristice.
A new and innovative busbar connection system for gas insulated. Occupies very less space 110th compared to ordinary substations. L2 inductance of the gis bus bar c2 capacitance of the gis bus bar. A typical gas insulated substation is shown in fig. The main criterias to be considered during selection of one particular bus bar. Three phase encapsulated type sf6 gas insulated switchgear. According to the author gis are much more reliable, compact and maintenance free.
Gas insulated substations gis are different from air insulated substations as all the substation equipment such as bus bars, circuit breakers, current transformer, potential transformers and other substation equipment are placed inside the modules filled with sf6 gas. Bolted connections are utilized in connecting two or more flat surfaces together. Gas insulated substation with double bus arrangement 10sep12. Very fast transient over voltage vfto is a unique electromagnetic transient phenomenon occurring in gas insulated substation gis, which determines the insulation level of the gis above 330 kv. As vacuum technology is not available for high voltage, so for gis or gas insulated switchgear system above 72. Steel structures provide support for insulators, which are used to terminate lines, and support buses.
The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. The siemens gasinsulated switchgear gis is an extremely successful product. Gis there are two terms presented in iec gas insulated switchgear and ieee. Gas insulated substation definitions and basics cedengineering. Jan 31, 2008 conventional substations using atmospheric air as the main dielectric cannot satisfy these requirements, but totally enclosed substations using sulphur hexafluoride sf6 gas insulation that are also known as gas insulated substations gis. Compact layout allows for straightforward viewing of spring. Continuous further development has reduced the footprint required for 145kv gis to only 25% of the. Bus bars shall be tubular type or flat type in construction and shall be bare and insulated with sf6 gas only. Major components you can spot while looking at hvehv gis.
Energy division, gas insulated switchgear, siemens, erlangen, germany. Gas insulated substation free download as powerpoint presentation. The circuit breaker is the most critical part of a gas insulated substation system. Bus bar arrangement of substation free download as powerpoint presentation. Insulated copper bus bar is used to create improved grounding for switchgear, switchboards, and busway or bus duct installations. Gas insulated substation gis also called sf6 gas insulated metalclad switchgear is preferred for 12kv, 36kv, 72. Elk04 up to 170 kv modular solution for reliable energy supply english pdf brochure gasinsulated switchgear elk04, 170 kv modular system with 4000 a, 63 ka english pdf brochure gasinsulated switchgear pioneer and technology leader, driving gasinsulated switchgear gis innovations english pdf brochure.
Sulphur hexaflouride sf6 gas the primary insulating medium. A busbar may either be supported on insulators, or else insulation may completely surround it. Gastightness essential for the functionality static and dynamic solutions design and material assure extreme low leakage rate functionality and environmental protection design and material assure extreme low leakage rate iec 62271203 highvoltage switchgear and controlgear part 203. Fixedmounted circuitbreaker switchgear 8da10 and 8db10 is indoor, factoryassembled, typetested, singlepole metalenclosed, gasinsulated switchgear with metallic partitions, for singlebusbar and doublebusbar applications, as well as for traction power supply systems. In the ring bus a sectionalizing breaker has been added between the two open bus ends. Sf6 gas having high dielectric property acts as insulating medium. As a result, substation equipment had to be made more reliable and. Abbs gasinsulated switchgear supports integration of wind power into the danish. Because of the sf6 gas in the sealed tank, so the gas insulated substation components work in stable condition, it will be much less fault than the air insulated substation.