Unigear zs2 formerly known as unisafe 36 is a medium voltage, metalclad airinsulated switchgear ais suitable for indoor installations. We believe that although many gis manufacturers produce a product similar to ours, it is our ability of giving you a high quality system at a reasonable price that sets us apart. You see, the differences between the gas insulated substation and air insulated substation are massive. A hybrid switchgear is one that combines the components of traditional air insulated switchgear ais and sf 6 gas insulated switchgear gis technologies. Understanding differences between gis and ais in five points. Comparison of gis and ais systems for urban supply networks. For this network the impact of the application of air insulated substations ais and gissubstations on the whole system costs is compared. It also includes a protection device and a metering device.
Xdge is one of the most reliable gas insulated switchgear suppliers with. It is characterized by a compact and modular design, which encompasses several different functions in one module. You will find five major deliberations in the differences between the two hv substations. Vacuum interrupting technology enables the implementation of clean air as an insulating medium for gasinsulated switchgear up to 145 kv. These switchgears are built at site utilizing individual standard components. Air insulated substation ais life cycle cost method lcc. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011. Airinsulated substations up to 800 kv digital asset management. An ais unit is basically a conventional switchgear technology where air is used as a primary dielectric for insulation. Gas insulated substation definitions and basics cedengineering.
Provides compact and programmable switching and power fuse protection for power distribution. Looking for answers on what makes air insulated switchgear different from gas insulated switchgear. Gis there are two terms presented in iec gas insulated switchgear and ieee. Gas insulated switchgear gis using sulphur hexafluoride sf6 has been in use since the 1960s, at high voltage hv application first and medium voltage mv much later. Gasinsulated highvoltage switchgear gis is a compact metal encapsulated switchgear consisting of highvoltage components such as circuitbreakers and disconnectors, which can be safely operated in confined spaces. The main advantage of this gas insulated substation is because of its compact size due to a high dielectric strength of the sf 6 gas. Difference between air insulated switchgear and gas. Study of gas insulated substation and its comparison with. Sf 6 gas has excellent dielectric strength and interruption performance. Ais, the full name is air insulation switchgear, that means the material between the high voltage conductor is air, you can observer that just see the equipment. 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. The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions.
Iec air insulated switchgear unigear zs2 abb group. 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 differences between air insulated substation engineering and gas insulated. Industry design and test standards for mediumvoltage switchgear and circuit breakers whether they be air insulated, gas insulated, sf6 or vacuum interrupters.
Gas insulated switchgear where the insulation medium is sf6. The sf6 emission impact theoretical elearning training provides the needed knowledge for the prevention of contaminated sf6 emissions and the related health hazards for personnel handling this highly potent greenhouse gas. Air is also used for insulation but sf6 has significant property advantages. Five differences between air insulated substations and gas. Recently we had to change a gis design to ais due to an instruction from one of our clients. Siemens clean air technology is the first fgasfree insulation for highvoltage gis. Zx2 medium voltage primary gas insulated switchgear english pdf presentation zx2 single busbar systems up to 5000 a gasinsulated medium voltage switchgear english pdf leaflet zx2 gasinsulated medium voltage switchgear single busbar systems up to 5000 a for the us market english. To a bigger extent, this is connected to the compactness of gis and its very low maintenance. While understanding the clients reasons, im not convinced on the argument. Gas insulated substation has gas monitoring system. Abb substations with air insulated switchgear ais provide a costefficient and wellproven solution without compromising on reliability. Traditional load break air switch with power fuse protection for power distribution. Gas insulated substation gis vs conventional outdoor substation ais by engr.
Abb is the pioneer in gis technology with over 45 years of proven technology for complex switchgear applications. Abbs modular and ecoefficient 145kilovolt gasinsulated switchgear duration. Eatons vfi underground distribution switchgear provides a simple, economical approach to protective requirements for 5, 15, 25, and. Gas monitoring systems any devices for measuring, signalizing, or providing. The main differences between ais airinsulated switchgear and gis gasinsulated switchgear can be summarized as in attached document, the technology selection remains affected by economic considerations and local habits on a projectsolution level. Switchgear and its components are a vital link in the transmission and distribution chain. The same switchgear constructions are used in primary distribution by the utilities and in heavier industrial and power plant applications. Technoeconomic comparison between gas insulated substation gis and air insulated substation ais. On a 36 kv voltage level also outdoor air insulated constructions are used to some extent. Several researchers have studied and compared the electrical properties of the two gases. According to the author gis are much more reliable, compact and maintenance free. These air insulated substations ais differ from gas insulated substations gis in that the bus and equipment are more susceptible to the elements temperature, contamination, animals, etc. Today we chose to publich this one, in which he draws a comparison between gis gas insulated substations and ais air insulated substations.
The main differences between ais air insulated switchgear and gis gas insulated switchgear can be summarized as in attached document, the technology selection remains affected by economic considerations and local habits on a projectsolution level. Sulphur hexaflouride sf6 gas the primary insulating medium. Airinsulated substation elearning ge grid solutions. Key property of ais unit is stepup systems in connection with power stations and. Pioneer and technology leader driving gis innovations. This issues electrical substations channel will examine the characteristics of gasinsulated switchgear gis and metalclad air insulated switchgear and outline the benefits and drawbacks of each in five points. Gis high voltage substation engineering uses the gas sulfur hexafluoride for.
Gasinsulated highvoltage switchgear gis is a compact metal. Due to their compactness and flexibility, gis substations can be lo. And the availability and reliability of the gis substations are more compared to air insulated substations faults occurring chances of air insulated substation or conventional substations are more. The differences between air insulated substation engineering and gas insulated substation engineering are vast. Gas inside each compartment should have a pressure of about 3kgcm 2. Our portfolio of highquality products and advanced technologies, including disconnecting circuit breakers dcb and iec 61850 substation automation systems, reduce substation footprint and enable smart grid integration. If the pressure drops slightly, the gas is automatically trapped up. Mv air insulating switchgear ais skip navigation sign in.
Are you looking for support or purchase information. However, use of sf 6 gas has become regulated under agreements set at the 1997 cop3. Substation engineering ais and gis substations beta. It represents an important step towards the company goal of developing completely environmentally friendly technologies. The basics of primary medium voltage switchgear eep.
Various arguments exist around sf6 gas insulated gis and air insulated ais switchgear. Gas insulated substations is an allinclusive reference guide to gas insulated substations gis which takes account of its basic principles, technology, application, design specification, testing and ownership issues. Gas insulated substation gis advantages disadvantages. Study of gas insulated substation and its comparison with air insulated substation. Medium voltage iec gas insulated primary switchgear gis. Airinsulated, arc resistant drawout switchgear with vacuum circuit breakers for large, complex power distribution and control. Pdf comparison between gas and air insulated network concepts. By reducing the distance between active and non active switchgear parts, less. If the switchgear is sold to new owners, they must receive this document along with the. Difference between ring main unit and switchgear orecco.
Other common types are oil or vacuum insulated switchgear. Ring main unit is a compact, sealed and enclosed type of switchgear. Cable connections are with insidecone plugin system, or for connection of. Metal sheets segregate each compartment and the energized components are air insulated. A switchgear may be a simple openair isolator switch or it may be insulated by some other substance.
Pdf technoeconomic comparison between gas insulated. Whats the different between ais and gis switchgear. It has a modular design and is built with robust and wellproven components. You see, complete switchgear simply means, assembly of needed switching devices. In gasinsulated switchgear, earthing of switchgear sections is performed by a high quality vacuum circuitbreaker. Gasinsulated switchgear transmission products siemens. However, air insulated substations also offer many advantages. For these reasons, it has been widely used for gas. As the parts are fully insulated, no cables or linkage can come in contact with the.
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. And the availability and reliability of the gis substations are more compared to airinsulated substations faults occurring chances of air insulated substation or conventional substations are more. An effective although more costly form of switchgear is the gasinsulated switchgear gis, where the conductors and contacts are insulated by pressurized sulfur hexafluoride gas sf 6. There are five major considerations in the differences between the two high voltage substations. With further gas leakage, the low pressure alarm is sounded or automatic tripping or lockout occurs. Presently, development of a gas circuit breaker gcb using co 2 gas and development of a high. Gasinsulated switchgear from siemens will support you with a largely maintenancefree, stable, and tested design for maximum availability even under extreme environmental conditions. The assembly of apparatus used to change some characteristice. Secocue 36v gas insulated medium voltage switchgear secocube is an indoor, factoryassembled, metalenclosed, cubicle type gasinsulated switchgear for single busbar applications. Practical and theoretical aspects are handled by acknowledged gis experts who have been involved with the technology from the start. Gasinsulated substations high flexibility of its solutions modularity, expandability. Due to the gas enclosed design, gis is the most suitable solution for indoor and underground substations. Due to the gas enclosed design, gis is the most suitable.
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