Read more about busbar configuration in a substation. A typical gas insulated substation is shown in fig. Bus bar arrangement of substation free download as powerpoint presentation. Jan 26, 2018 this feature is not available right now. In a gis substation, the various equipment like circuit breakers, bus bars, isolators, load break switches, current transformers, voltage transformers, earthing switches, etc. Iec 62271203 gas insulated metalenclosed switchgear for rated voltages above 52kv. They are also used to connect high voltage equipment at electrical switchyards, and low voltage equipment in battery banks. Gas insulated substation free download as powerpoint presentation. Presented paper refers to service continuity of gas insulated substations, a topic which is also dealt in annex f of iec international standard no. 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 siemens gasinsulated switchgear gis is an extremely successful product. 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. 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. Several crucial terms are for better understanding of the presented material. Xdge provides gas insulated switchgear gis solutions for high to ultra highvoltage.
Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. Single busbar is quite available as soon as redundancy is properly implemented. 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. 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. Jan 02, 2019 sf 6 gas pressure for insulating purpose is generally kept below 2. Gasinsulated switchgear up to 145 kv, 40 ka, 3150 a type series. 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. A busbar may either be supported on insulators, or else insulation may completely surround it. 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. Technical specification for gas insulated metalclad 36kv. Gasinsulated switchgear installation instructions no. Scribd is the worlds largest social reading and publishing site. This problem is the voltage magnifications due to reflections of switching and lightning surges at various junctions within the gis.
The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. In addition, the use of sf6 as insulating gas with its unique insulation features allow the realization of very compact switchgear designs. 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. This is a significant change in operating the switchgear with circuit breakers, disconnectors, and switches earth. Three phase encapsulated type sf6 gas insulated switchgear. Sulphur hexaflouride sf6 gas the primary insulating medium. 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. The assembly of apparatus used to change some characteristice. Xdge provides gas insulated switchgear gis solutions for high to ultra high voltage.
Electrical bus system and electrical substation layout. 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. Sf6 gis gas insulated substation manufacturer in china. Introduction to gas insulated substations switchgears gis. Transformer failures related to lightning and switching are often reported in the gas insulated substation gis. Key property of ais unit is stepup systems in connection with power stations and. New mitigation methods for transient overvoltages in gas insulated.
Compact layout allows for straightforward viewing of spring. Gis gas insulated substation sf6 sulphur hexa fluoride gib gas insulated bus duct cb circuit breaker. The substation bus tubing or bus bar is aluminum or copper. Gas insulated substation gis also called sf6 gas insulated metalclad switchgear is preferred for 12kv, 36kv, 72. Hence, most preferred where area for substation is small eg. 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. Classification of vfto in high voltage gis substation. Fixed contact, which is located at the live bus conductor and which forms a part of the main gas insulated system.
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. In other words, it is a type of electrical junction in which all the incoming and outgoing electrical current meets. 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. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. The circuit breaker is directly connected to either current transformers or the isolators in gas. Rather than branching from the main supply at one location, they allow new circuits to branch off anywhere along the route of the busway. Operation and maintenance of a gas insulated substation. With layout flexibility, the zf8550 gis consists of a circuit breaker. The author in his paper has made comparison of gas insulated substation. Bolted connections are utilized in connecting two or more flat surfaces together. A bus bar also spelled busbar, buss bar or busbar, is a strip or bar of copper, brass or. Gis gas insulated substations ais air insulated substations vft very fast transients. Gis substation design and execution hv and ehv gis. Continuous further development has reduced the footprint required for 145kv gis to only 25% of the.
Overhead busbar design for 22066 kv gis substation prakruti shah1 and hetal desai2. 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. Nov, 2016 gis substation bus bar part 1 pavan choudhary. The circuit breaker in a gas insulated system is metalclad and utilises sf6 gas, both for insulation and fault interruption. Mar 18, 2014 sub stationsair insulated substations 1. 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. If the switchgear is sold to new owners, they must receive this document along with the. Bus bars shall be tubular type or flat type in construction and shall be bare and insulated with sf6 gas only. Product brochure gasinsulated switchgear type elk3 gis for maximum performance, 420 kv.
Occupies very less space 110th compared to ordinary substations. Training, service, and maintenance of gasinsulated substations. Gas insulated substation with double bus arrangement 10sep12. 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. Connector for drillfree connection on the busbar bars for thickness 10 mm. 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. Gis configurations can be applied to any type of bus bar arrangements. 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. Aluminium bars for the aluminium bars of same dimensions as the solid bars. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. Connection earth neutral corner piece for earth neutral connection, l 1750 mm.
Online sf6 monitoring breaking paradigms qualitrol. Major components you can spot while looking at hvehv gis. The power from gis was fed into two 100 mva transformer which stepped the voltage down to 66 kv. As there is an extremely low frequency of manual gis. Very fast transient over voltage vfto is a unique electromagnetic transient phenomenon occurring in gas insulated substation gis, which determines the. Moving contact system mounted on the enclosure of the main module and aligned to the fixed contact. Thereby overvoltages in gis are more important than air insulated. Energy division, gas insulated switchgear, siemens, erlangen, germany. Pdf gasinsulated substation service continuity researchgate.
A new and innovative busbar connection system for gas insulated. A gis is the implementation, within a complete hv substation, of the remarkable sulphur. The bus bars are conducting bars to which various incoming and out going bars are connected. Gasinsulated switchgear up to 550 kv, 63 ka, 5000 a type 8dq1. The circuit breaker is the most critical part of a gas insulated substation system. Sf 6 gas pressure for insulating purpose is generally kept below 2. 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. Lsis who has been a leader in electricity and automation in. 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. Now there is a closed loop on the bus with each section separated by a circuit breaker. L2 inductance of the gis bus bar c2 capacitance of the gis bus bar.
Product brochure gasinsulated switchgear type elk3 gis. Various equipments like circuit breakers, bus bars, isolators, load break switches, current transformers, voltage. Connections to air insulated substations and transmission lines are easily accomplished through the use of sf 6. Mitigation of transient overvoltages generated due to.
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. Gas compartment must be provided with gas pressure monitoring by pressure gauge with signaling contacts, to signal any increase drop of gas pressure. An ais unit is basically a conventional switchgear technology where air is used as a primary dielectric for insulation. The individual panels are to be connected by sf6 insulated, plugin bus bars inside the sf6 gas compartment. This equipment is a compact multicomponent assembly, enclosed in a ground metallic housing, which the primary insulation medium is a compressed gas. 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. 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. As vacuum technology is not available for high voltage, so for gis or gas insulated switchgear system above 72. Its a colorless, odorless, nontoxic, liquified gas. Busways, or bus ducts, are long busbars with a protective cover.
In outdoor and hybrid substations, the occupied area is tremendously reduced by using gis technology. Xdge is one of the most reliable gas insulated switchgear suppliers with. Insulated copper bus bar is used to create improved grounding for switchgear, switchboards, and busway or bus duct installations. 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. 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. Sealed gis is safe to touch and inherently arcresistant. 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. Sf6 gas superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation preferred for voltage ratings of 72. 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. Disconnect switches and other equipment are mounted on the steel structures. 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.
Guidelines for usage of air insulated substation ais or gas. Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. Abbs gasinsulated switchgear supports integration of wind power into the danish. Gis there are two terms presented in iec gas insulated switchgear and ieee. Gas insulated substation gis vs conventional outdoor substation ais by engr. Gas insulated substations are having more advantages than air insulated substations. Economics between conventional and gas insulated substation. 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. The third chapter presents the technology, covering the following in detail. Medium voltage gasinsulated switchgear up to 24 kv schneider.
According to the author gis are much more reliable, compact and maintenance free. Steel structures provide support for insulators, which are used to terminate lines, and support buses. 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. So the gis gas insulated substation is the best choice for the projects which is small space of compact design. The sf6 gas pressure in a circuit breaker is around 0. This course is based on terms used in ieee and iec regulations. Gas insulated substation definitions and basics cedengineering. Gas insulated substation electrical substation transformer. Secocue 36v gas insulated medium voltage switchgear secocube is an indoor, factoryassembled, metalenclosed, cubicle type gas insulated switchgear for single busbar applications. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. 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. In the ring bus a sectionalizing breaker has been added between the two open bus ends. The main criterias to be considered during selection of one particular bus bar. Nov 2003 connection to grid customers benefits project completed on time in spite of very tight schedule and unpredictably adverse conditions sars, weather.
Highvoltage conductors, circuit breaker interrupters, switches, current and. 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. Sf6 gas having high dielectric property acts as insulating medium. 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. 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. Single busbar, double busbar, single busbar with transfer bus, double busbar with double circuit breaker, one and a half circuit breaker scheme and. Buffer compartment concept, activepassive busbar concept, location of earthing switches, temporary earthing facilities are analysed, too.
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