Sulphur hexafluoride sf 6 is a nontoxic, odourless gas with unique electrical properties. These decomposition products arise during operation through arcing in moist or impure sf 6 gas. A similar insulator seals off this chamber from the circuit breaker. High voltage connections are brought out through epoxy bushings. To date, there has been no alternative to sf6 technology since its inception in the 1970s, when it was introduced as an insulation medium in high voltage hv switchgear. It combines unique electrical insulation and arc interruption capability. The gasinsulated switchgear elk04 is the ideal solution for reliable energy supply up to a rated voltage of 170 kv, a rated normal current up to 4000 a, and a rated short circuit current up to 63 ka. Integrated gasinsulated switchgear up to 420 kv abb group. Zx family medium voltage primary gasinsulated switchgear english pdf. Replacing sf6 in electrical gasinsulated switchgear. Training training on proper sf6 gas handling procedures is essential to switchgear life extension and maintaining switchgear effectiveness. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. Max, kv pounds of sf6 gas 3way models 4way models 6way models 17 17 25 29 17 25 38 15 19 29 table 1. Available gas insulated mv switchgear ratings up to 38kv and 2000a.
Iec for sf6 gas insulated switchgear bays complete with all necessary control and instrumentation devices. By directly coupling with gas insulated switchgear, substation space can be minimized as the result of compact facilities a non flammable, nonpolluting and tankexplosion prevention transformer. Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a type 8dn9. Gis elk04 up to 170 kv gasinsulated switchgear abb. Lifting provisions shall be arranged on the tank to provide a distributed balanced lift in a vertical direction. The sf6 gas filled disconnectorbus chamber is sealed off from the adjacent bays by gastight and arcproof disconnectors. The sf6 gas insulated rmu rvac is a fully insulated, fully isolated electrical ring main unit rmu developed for cable circuit applications. Integrated gasinsulated switchgear up to 420 kv modular gis in prefabricated housing integrated gasinsulated switchgear is a predesigned, standardized and fully integrated configuration based on abbs well proven gis technology. Sulfur hexafloride sf6 gas insulated metal clad switchgear.
Product brochure gasinsulated switchgear type elk3 gis. It has been estimated that emissions from use of the product on a cradletograve basis was as high as 15% of the amount of product used. The abb portfolio for gasinsulated high voltage switchgear comprises several. This twoday course is a handson way to learn how to reduce contaminants and emissions during filling, filtering, testing, and removal. Since its introduction back in 1968, siemens has installed switch fields in all climatic zones of the earth, recording over 420,000 years of operation since. Secormu is a compact, modularized, extendable gas insulated ring main unit with all the primary conductive system sealed in a stainless sf6 gas tank, providing customers a reliable, highperformance and cost efficient product, helping customers to reduce the operating and maintenance cost. Main construction load break switch sf6 gas insulated system the load break switch applies metal deionizing arc suppress technology, ensuring. T155 hgis hybrid gas insulated substations 420 kv, 63 ka, 5 000 a, 2 cycles ge makes the most of 50 years of experience in design, material selection, development, engineering, manufacturing and servicing of gas insulated substations.
Health and environmental dangers of sf6filled switchgear. The siemens gas insulated switchgear gis is an extremely successful product concept. This ultimately reduces the space required onsite and associated civil engineering costs. Development sf6 alternative gases in switchgears 1 sf6 gas is widely used in electric power transmission and distribution systems, as for example in gas insulated switchgear gis, circuit breakers cb and load break switches.
For over 50 years, it has been used in highvoltage gas insulated switchgear gis, where its excellent dielectric and arcquenching properties make it an ideal insulating gas for medium and highvoltage equipment. Sf 6 was discovered around the turn of the twentieth century and, by the 1950s, the electric power industry in the usa widely praised sf 6 as a highly favourable gaseous dielectric medium in high and mediumvoltage circuit breakers, switchgear, gas insulated substations, and other electrical equipment. The gas system for the circuit breaker is independent of the other parts of the switchgear. The new fluoroketonebased gas mixture delivers the reliability of abbs proven switchgear range with a global warming potential gwp of less than 1 99. Abb unveils worlds first airplus gasinsulated switchgear. Gas in switchgear sf 6 was discovered around the turn of the century and, by the 1950s, the u. The gas insulated switchgeargis hgis is composed of the major equipments used in a substation such as circuit breaker, disconnector, earthing switch, voltage transformer and surge arrester in a grounded metallic enclosure. Gasinsulated switchgear mediumvoltage sf6 insulated. Gis gas insulated switchgear industrial pdf catalogs brochure. 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.
Gas insulated switchgear gas insulated switchgear gis, where the conductors and equipments are insulated by pressurized sulphur hexafluoride gas sf6. This rmu uses sf6 gas for insulation, which effectively minimizes the impact of harsh environments. The sf6 blanket, solidly insulated busbar and cable connections help protect the. Circuit breaker is vacuum type and switches are loadbreak and faultmake. The switchgear tank shall be furnished factory filled with an electrical grade of nontoxic, noflammable sf6 gas and have a pressure gauge, which provides status of the insulating gas. Available sf6 gas it is recommended that 20% more gas than indicated above be available. Since its introduction back in 1968, siemens has installed more than 28,000 indoor and outdoor switchgear bays worldwide, and well over 300,000 bayyears of operation have been recorded. 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 low centre of gravity using a horizontal doublebreaker puffer circuitbreaker, optimal characteristics in seismic areas could be achieved. Mv gas insulated switchgear for primary distribution suitable for indoor. The plant safety of sf 6 gas insulated switchgear is reduced significantly through low concentrations of decomposition products. The systems are designed and use the same components for both indoor and outdoor applications. Sf6 detection with optical gas imaging powertech labs. Nonextensible is standard busbar extensible is optional.
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. This free online tool allows to combine multiple pdf or image files into a single pdf document. Sf6 as an interrupting andor insulating medium sulphur hexafluoride sf6 is used as a switchgear interrupting medium from 1 to 800kv nonflammable arcquenching nontoxic inert odourless highly stable gas heavy gas two different types of arc control device, both relying on extending and cooling the arc puffer rotating arc. The operating pressure of the sf6 gas shall be specified and monitored and also facilities for toppingup the sf6 gas shall be provided, in case of non hermetically sealed enclosures. The siemens range of gasinsulated switchgear gis, for rated voltages from 72. Gas insulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate gas compartment tt f th td i 01% t t. Sulfur hexafluoride sf6, which is the preferred gas for use in gas insulated switchgear circuit breakers, disconnect switches, etc. Hmb operating mechanisms combine the advantages of classical hydraulic. National grid begins journey to sf6free hv substations. Sf6 gas insulated equipment monitor quality of sf6 with online dew point and pressure measurement the electric power industry uses sf6 to insulate switchgears, circuit breakers and other equipment used in electricity transmission and distribution. Evaluation of sf6 leakage from gas insulated equipment on electricity networks in great britain article pdf available in energies 118. Gasinsulated switchgear transmission products siemens.
Highvoltage gis gas insulated switchgear features since the first operation of the phase segregated type gis in 1970, fuji has successfully developed as a standard series of phase segregated type or three phase encapsulated type gis which realized a quite compact and very reliable construction. Gas insulated switchgear or gis includes switches, standalone gas insulated equipment, and any combination of electrical disconnects, fuses, electrical transmission lines, transformers andor circuit breakers used to isolate gas insulated. Become trained by our expert field service engineers. As one of the leading manufacturers of medium voltage sf6 gasinsulated switchgear gis in china, orecco designed the gas insulated switchgear for the secondary voltage distribution network in 6 different configurations. Eatons power xpert xgis mediumvoltage gas insulated switchgear enhances safety with a highly reliable and compact sf6 insulated switchgear design with virtually no maintenance for lower ownership cost and optimized roi. Gas insulated switchgear gishgis up to 252kv compact. Iec 62271203 highvoltage switchgear and controlgear part 203. Rulemaking to consider the adoption of a proposed regulation for reducing sulfur hexafluoride emissions from gas insulated switchgear february 25, 2010 public comments received. This sf6 alternative insulation medium is called g3. With an excellent reputation, it is used in municipal electrical grids throughout china. Abb has launched its ecoefficient mediumvoltage gas insulated switchgear gis range with its airplus formula. Ring main unit switchgear comprises of one to four compact functional units such as. Sf6 is mainly used as a gaseous dielectric in gas insulated switchgear power installations.
Medium voltage iec gas insulated primary switchgear gis zx2. The sf6 gas insulated metal enclosed switchgear shall be totally safe against inadvertent touch of any of its live constituent parts. Extreme low emissions protect the environment stateo eart design gas compartment axial direction. Iv general technical specification for 220kv sf6 gas insulated metal enclosed switchgear on photo.
The gas insulated switchgear gis is designed using threephase common or singlephase enclosures. If the switchgear is sold to new owners, they must receive this document along with the. Advance gas shielded welding as well as a sealing pressure system of less than 1 leakage rate ensure a 30 year service cycle. Gasinsulated switchgear up to 245 kv, 50 ka, 4000 a type. It should be designed for indoor application with meteorological conditions at site. Since its introduction back in 1968, siemens has installed more. The siemens gasinsulated switchgear gis is an extremely successful product concept.
In the early stage of gas insulated switchgear gis in this voltage level, abb introduced one of the worlds first 500 kv gis type elk3 in 1976. Transformer sf6 gasinsulated transformer meidensha. The ul listed, gas insulated circuit breaker switchgear cbgs0 is compact and easy to install and operate. The vista tank contains the following amount of sf 6 gas. The sf6 gas insulated transformers are suitable for the following applications. Hmgs cubicle type gas insulated switchgear is an integrated assembly of vacuum circuit breaker, 3position switch, disconnector, bus connecting system and.
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