Since the first delivery of sf6 gasinsulated transformers in 1967, toshiba predicted immense future prospects for this type of transformer that utilizes the features of sf6 gas known for its nonflammability and coordinative ability with environmental conditions. The portfolio has expanded to include advanced technical solutions, environmental services, and equipment which is available for purchase or rent. Hence, sf6 transformers find their application in the areas where firehazard prevention is of paramount importance. Phase segregated type sf6 gas insulated switchgear type. The construction of gas insulated transformer is basically the as an oil insulated transformer with small difference that oil is replaced by sf6 gas. China jdqxf series sf6 gasinsulated voltage transformers pt. Toshiba international corporation tic is toshibas premiere manufacturing base in north america. Because the electric utility industry is responsible for 90% of the sf6 global market, we see eliminating this potent greenhouse gas from our value chain as a duty of care. 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. Tg sf6 current transformers reference countries for sf6 more than 16. Introduction the equipment for electrical energy distribution that we present in this catalogue, are composed cells manufactured under a metallic housing isolated in sulphur hexafluoride, sf6. Current transformers, sf6 gasinsulated lvqbseries 36kv765kv.
Design and implementation of sf6 gas insulated medium. The gas system for the circuit breaker is independent of the other parts of the switchgear. Exact measurements of the capacitance and tan delta. The sealing equipment of the sf6 gis including the rubber oring and bolts were numerically simulated. In electrical energy technologies, the gas sulphur hexafluoride sf 6 currently plays a key role as an insulating and arcquenching medium, particularly in switchgear. Sf6 gasinsulated transfomers are designed to reduce fire hazards and less risk on the environment. Toshibas gas insulated transformer git is the most technologically advanced solution for hydropower and underground substations, densely populated cities, mission critical substations, and offshore substations. Sf6 gas has an extremely low density, making the flexible arrangement of. The standard capacitors of the series yl are used for. A 275kv power transformer with a low noise, using sf6 gas alone for both insulation and cooling, was developed with new technology and put into service in 1990 in hongkong. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate sf6 is the most potent greenhouse gas that it has evaluated, with a global warming potential of 23,900 times that of co2 when compared.
The active part is built into a steel tank filled with sf6 4. Transformer divyas blog for electrical engineering. Meppi supplies sf6 gasinsulated transformers for applications where a nonflammable, nonpolluting transformer is desired, such as in densely populated areas, inside buildings, and in areas near lakes and rivers where potential oil leakage from a conventional transformer would be harmful to the environment. Conclusion of sf6 properties and gas insulated equipment study model. Meppi supplies sf6 gas insulated transformers for applications where a nonflammable, nonpolluting transformer is desired, such as in densely populated areas, inside buildings, and in areas near lakes and rivers where potential oil leakage from a conventional transformer would be harmful to the environment. Gasinsulated instrument transformers for outdoor installation. Power supply, transformer, circuit breaker manufacturer supplier in china, offering 12kv solid insulated switchgear with sf6 gas, kyn2812 indoor ac metalenclosed switchgear, 12kv medium voltage solid insulated switchgear and so on.
The primary winding is galvanically separated from the secondary winding. Voltage transformer, gas, ct manufacturer supplier in china, offering jdqxf series sf6 gasinsulated voltage transformers pt fro transformer, 2. Gas insulated switchgear is used in industrial areas to fulfil highenergy. Sulfur hexafluoride sf6 safety data sheet sds p4657. Sf6 gas has excellent dielectric strength and is nonflammable. In this paper, sf6 gas insulated voltage instrument transformer vit is designed and implemented and also tested electrostatically. Iec 62271203 highvoltage switchgear and controlgear part 203. The manufacturing process is optimized to give a partial. Sulfur hexafloride sf6 gas insulated metal clad switchgear. Procuring sf6 free technology is an imperative in this regard. The sf6 gas filled disconnectorbus chamber is sealed off from the adjacent bays by gastight and arcproof disconnectors. Sf6 gas insulated type transformers are the most clean and safe to operate.
A complex model consisting of air bubbles inside the epoxy cast resin is used for computer tests. Advantages of sf6 gas insulated transformer transformer. Sf 6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. Sf6 gasinsulated current transformers is applied for metering and protect. Gasinsulated instrument transformers 72800kv sas, svs, svas. The sf 6 gas filled disconnectorsbus chamber is sealed off from the adjacent unit by gastight and arcproof insulators. Particularly in japan, where land acquisition is extremely difficult, there is a large. Sulfur hexafluoride safety data sheet p4657 this sds conforms to u. Sf6 gas insulated current transformers 36765kv lvqb series 765kv 550kv 420kv 362kv 300kv 245kv 170kv 145kv 123kv 72. 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.
Distribution transformer, sf6 insulation, epoxy cast resin, transformer oil. The word on in white letters on a red background shall be used to indicate the. Consult trench groups entire gasinsulated instrument transformers. As a result, gas insulated transformers, gas insulated shunt reactor, gis and control panels can be installed in the same room, and such installation realizes the fully sf6 gas. In other words, net ionisation of the gas must take place.
Abb high voltage service us started offering sf 6 gas management services in 1998. Sf6 gas transformers transmission distribution systems. Concept for sf6free transmission and distribution of. Core the core is made of highgrade, coldrolled, grainoriented, siliconsteel sheets that have been given an inorganicfilm treatment to help the core maintain its excellent characteristics. The active part is air insulated and built into a cubicle. You can also choose from single, three sf6 transformer there are 791 suppliers who sells sf6 transformer on, mainly located in asia. Sulfur hexafloride sf6 gas insulated metal clad switchgear the gas insulated switchgear gis is designed using threephase common or singlephase enclosures.
Products include electric motors and motor controls, adjustable speed drives, power electronics, transmission and distribution systems, and more. The sf6 insulated standard capacitor is designed for indoor service or outdoor service. Monitoring of sf degradation in gis using frequency response. At gasinsulated equipment manufacturers, gasrecovering equipment is installed in their plants and recovered sf 6 gas is being reused. The insulation core of the pobr is produced by winding crepe paper onto a central rod, with aluminium foil insert for electrical stress control. For this purpose, a single phase gis filled with sf6 between the. Using sf analysis for condition based maintenance 6 of. Customers turning to sf6 demanding customers high rated voltage high rated current shorttime delivery.
Recommended set of shortcircuit endurance csn 38 1754, csn 33 3015 rated switchingoff current i nvyp ka rms value, its heat impacts must be survived by an electrical equipment for a. Development of 275 kv gas cooled type gasinsulated power. Three phase encapsulated type sf6 gas insulated switchgear. Toshiba gits are insulated with sf 6 gas rather than traditionally hazardous oil which risks fire, explosions, and contaminating leaks. Effects of bolts number, the tension moment of bolts, and gas pressure on contact stress and peak stress of oring were mainly studied. This forms the connection to the other components of the metalclad hvac test system or to the test object itself. Lvqbtype sf6insulated current transformer advance utility. Gasinsulated instrument transformers for outdoor installation trench germany the former mwb, founded in 1946 is a recognized word wide leader in the design and manufacture of high voltage equipment for electrical and industrial systems. Furnish sf6 insulated switchgear as detailed in sections 3. Water treatment plants and hydroelectric power plants where waterways must be kept unpolluted.
Due to lower specific gravity of sf6 gas, the gas insulated transformer. Oil filling and periodical oil samplings are not required. In addition to its many advantages in terms of technical properties, sf 6 has the disadvantage of having a very high global warming potential gwp. Sf6 gasinsulated 50kva distribution transformer design tubitak. Gasinsulated instrument transformers for outdoor installation open the catalog to page 1 gasinsulated instrument transformers for outdoor installation trench germany the former mwb, founded in 1946 is a recognized word wide leader in the design and manufacture of high voltage equipment for electrical and industrial systems.
The standard lightning over voltages is applied according to iec 660763 and iec 6186932011. Illustration of possible size of oil insulated substation and key barriers to its. Due, to the superior arc quenching properties of sulphur hexaflouride gas sf6 gas, the sulphur hexaflouride gas sf6 is used in transformers. Gas insulated substation report free download as pdf file. Oil to sf6 bushings series pobr voltage from 72,5 to 245 kv. Gas insulated substations gis is a compact,multicomponent assembly enclosed in a ground metallic housing in which the primary insulating medium is compressed sulphur hexafluoride sf6 gas. Gas leakage internal insulation level by means pressure gauge provided with an alarm threshold and lock threshold. Therefore, gasinsulated equipment like gas circuit breakers gcb, gasinsulated switchgears gis and gasinsulated transformers git are being widely and commonly used. This ultimately reduces the space required onsite and associated civil engineering costs. Gas insulated transformergit iec60076 part 15 gasfilled power transformers enacted in 2008 nonflammable and nonexplosive nonflammable and nonexplosive flexible arrangement safety transformer 1 2 flexible arrangement oits are an explosion risk oits require a firefighting system the tank of the mitsubishi git is insulated with non. Lvqb series current transformer has an inverted structure with sf 6 gas insulation please see the figure. Gasinsulated instrument transformers 72800kv sas, svs.
This 27511kv, 30mva transformer is the first gasinsulated power transformer in the world to reach the voltage level of 275kv. Gas insulated substation report electrical substation transformer. Advantages of sf6 gas insulated transformer free download as word doc. This is done for the enhanced efficiency of sf 6 gas chargedischarge operations performed on equipment under test, the efficient use of sf 6 gas, and the ensuring of safety for workers. In its long history while utilizing several insulation mediums, e.
Sulfur hexafluoride sf 6 is an inorganic, colorless, odorless, nonflammable, nontoxic but extremely potent greenhouse gas, and an excellent electrical insulator. Monitoring of sf degradation in gis using frequency. A builtin measuring capacitor with sf6 insulation is used. A similar insulator seals off this chamber from the circuit breaker. Finite element analysis of sealing structures for sf6 gas.
Any drawings or data sheets attached to the inquiry shall be considered part of this specification. By directly coupling with gasinsulated switchgear, substation space can be minimized as the result of compact facilities a non flammable, nonpolluting and tankexplosion prevention transformer. This paper investigates the possibility of using frequency response analysis to assess the quality of insulation medium in gas insulated substation gis. It is connected in series with electric energy measurement, measuring, and relay protection functions. The capacitor is provided with a top electrode which allows partial discharge free interconnections to the other elements of the hv circuit.
Nonflammable and nonexplosive sf6 gas makes our git much safer and more environmentally friendly than oil insulated transformers, which carry the risks of. Particularly in japan, where land acquisition is extremely difficult, there is a large demand for gis. The procedures for handling nonfaulted sf6 are well covered in manufacturers instruction books. Therefore, gas insulated equipment like gas circuit breakers gcb, gas insulated switchgears gis and gas insulated transformers git are being widely and commonly used. Applications of sf6 gas insulated transformer hospitals, underground shopping centers, substations where a high level of fire safety is required.
Sf6 gas insulated transformer are designed to ideally satisfy non flammabilityensuring plans of power receptiontransformation system installed in urban facilities. Specification of sf6 for use in electrical equipment. Distribution transformer, sf6, gasinsulated, electrostatic, heat, comsol. These procedures normally consist of removing the sf6 from the circuit breaker, filtering and storing it in a gas cart as a liquid, and transferring it back to the circuit breaker after the circuit breaker maintenance has been performed. The top countries of suppliers are china, india, and singapore, from which the percentage of sf6 transformer supply is 99%, 1%, and 1% respectively.
Advantages and disadvantages of sf 6 sulfur hexafluoride has several properties that make it a preferable dielectric fluid. This 27511kv, 30mva transformer is the first gas insulated power transformer in the world to reach the voltage level of 275kv. China 12kv solid insulated switchgear with sf6 gas china. Life time dielectric quality assured no checks, no treatment. A builtin measuring capacitor with sf6insulation is used. Sf6 gasinsulated transformer transformer meidensha. The body of the bushing is a continuous sheet of pure kraft paper, wound around a conductor rod and oil impregnated, with aluminium foils inserted within the. Sf6 filled standard capacitor samgor high voltage test.
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