The sf 6 gas which has high dielectric property acts as an. Here is a brief history of its development and pioneers. An effective although more costly form of switchgear is the gas insulated switchgear gis, where the conductors and contacts are insulated by pressurized sulfur hexafluoride gas sf 6. The portfolio includes gis solutions from 60 to 800 kv, along with hybrid, mobile and digital gis solutions, gas insulated lines and other secondary products to maximize switchgear and network. The gas insulated substation gis represents a key element of high voltage electrical transmission networks thanks to its reliability, low maintenance requirements and compact dimensions.
Gas insulated substations are particularly suitable for underground construction beneath public buildings. More and more substations throughout the world are facing various requirements that lead to the inevitable necessity of renewal of existing substation equipment without delay. Iec 62271203 highvoltage switchgear and controlgear part 203. The sf6 gas insulated substation gis contains the same compartments as in the conventional outdoor substations. Gasinsulated metalenclosed switchgear for rated voltages above 52 kv 092011 orequired leakage rate abstract. The eddy current losses and the outer field can be reduced by optimizing the gas insulated bus bars geometry. Research and development of graphical transient calculation.
Increase in demand for energy efficient power generation system. Gas insulated substation gis advantages disadvantages. A typical gas insulated substation is shown in fig. In the eu28, sf6 has been banned from several applications, however, an important exception is gas insulated electrical switchgear gis for which costeffective and. Gas insulated substations transmission distribution systems. 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. There are nonshielding methods, such as use of lightning arresters and spark gaps. Reduction of visual impact of substations by surrounding the substation with vegetation 3. In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. Gas insulated substation gis or gas insulated busduct gib. Gasinsulated substations high system reliability highflexibilityofitssolutions modularityexpandability gasinsulated 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. Gas insulated substations gis have been widely used in power systems because of their beneficial features. Substation equipment an overview sciencedirect topics. 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 speakers will discuss reliability and system planning implications for gas insulated substations. View gas insulated substations research papers on academia. Modeling and analysis of a 3phase 2kv gas insulated substation. His research activities are in the field of investigations of gas insulated high voltage compartments such as circuit breakers and gas insulated substations gis. To date, atmospheric concentrations of sulfur hexafluoride sf6 are the most potent among the greenhouse gases identified by the intergovernmental panel on climate change ipcc and are still rising.
Compliance with all technical requirements all energize elements comply with the required clearances clearances verify compliance with the last requirements of the national electrical safety code or prepa diseno subw\copy of svc subst profile 2. The sf6 gas insulated metal enclosed switchgear shall be totally safe against inadvertent touch of any of its live constituent parts. Gas insulated substation market 2025 by types, application. Our 12hour live online substation training course will cover the major elements that build electrical substations and switchyards. Pd test in gas insulated substation using uhf method. 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. Gis is now in widespread use in the electrical power industry, especially in metropolitan areas. This type of substation has some essential features. Modeling and analysis of a 3phase 2kv gas insulated. The clearance required for phase to phase and phase to ground for all equipment is much lower than that required in an air insulated substation. For designing a substation it is essential to know the maximum value of vfto. With gis the footprint of substations can be reduced. Operation and maintenance of a gas insulated substation pdh.
There are many cases that require uprating and upgrading of substation equipment in addition to the renewal with the same technical specifications. Abstract gas insulated substations are high voltage substations that are compact, requiring little maintenance when compared to air insulated conventional substations. Jan 18, 2017 speakers will discuss reliability and system planning implications for gas insulated substations. The problems of very fast transient oscillations vfto faced in gis and their possible solutions. Gasinsulated substation article about gasinsulated. Several crucial terms are for better understanding of the presented material. Analysis of effective factors on transient ground potential. Gas insulated substation authorstream presentation. Estimation of transient over voltages in gas insulated. Installation, maintenance, and end of life of a gas. The history of gasinsulated substations think grid.
A gas insulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. Gas insulated substations gis are widely used as important switchgear equipment because of its highly reliable, low space requirement, the risk factor is low and easy to maintenance, yet some failures have been reported. In order to determine the particle trajectories in a gib, an inner diameter of 55 mm and outer enclosure diameter of 152 mm were considered. With the widely used of gas insulated substation, especially for ultrahigh voltage level, very fast transient overvoltage generated by switching operations has caused more and more attention. Other common types are oil or vacuum insulated switchgear. Shigeru maruyama, the federation of electric power companies fepc mr. Modeling and analysis of a 3phase 2kv gas insulated substation m. Ena technical specification 4124 issue 2 november 2018 page 4 5. This document is issued as a guide for use in compiling procurement specifications for the design, fabrication, testing, installation and inservice performance of highvoltage gas insulated substation equipment. For this purpose, a single phase gis filled with sf6 between the main conductor and the enclosure is simulated in maxwell 3d using finite element method to obtain the electrical parameters of the substation in real mode operation. Wi series gas insulated medium voltage switchgear units are exclusively intended for switching and distributing electrical power. Ge designs, manufactures, installs and services a full range of stateoftheart gasinsulated substations gis for utilities and industries worldwide. According to the author gis are much more reliable, compact and maintenance free.
Insulation coordination for uhv gas insulated substation. A gas insulated substation gis is a high voltage substation in which the major structures are contained in a sealed environment with sulfur hexafluoride gas as the insulating medium. This guide applies specifically to all types of highvoltage gas insulated substation equipment rated above 52 kvac. The metalenclosed gas insulated switchgear is made as to ensure the best possible relationship between design, used materials, maintenance effort and maintenance intervals. Guidelines for determination of optimal location of a substation. The paper refers to diagnostics problems connected with the presence of partial discharges in gas insulated substation. Gas insulated substations gis differ from air insulated substations substations we usually see such that all the substation equipment such as busbars, circuit breakers, current transformer, potential transformers and other substation equipment are placed inside sf 6 modules filled with sf 6 gas. Gas insulated substations research papers academia. The south america gas insulated substation market region is expected to witness a cagr growth rate of 16. Gas insulated switchgear is used in industrial areas to fulfil highenergy demands by space saving design with a minimum of cost. Gas insulated substation definitions and basics course no.
Such over voltages can cause mal functioning of protection circuits and control circuits and also initiates faults and influence on other components such as transformers. The new 500220 kilovolt kv gas insulated substation will dispatch 1. Abstract the transient over voltages are generated in gas insulated substations gis during switching operation of substations in the order of a few nanoseconds. The live parts are supported on cast resin insulators. Some of the insulators are designed as barriers between neighboring modules such that the gas does not pass through them. On the basis of object oriented program oop technology a method for developing transient calculation system for gas insulated substation gis is presented in this paper. Gas insulated substations,ask latest information, abstract,report,presentation. They will compare substation safety and security using ais vs. The portfolio includes gis solutions from 60 to 800 kv, along with hybrid, mobile and digital gis solutions, gasinsulated lines and other secondary products to maximize switchgear and network. Gis highvoltage gas insulated switchgear substations. Pd test in gas insulated substation using uhf method abstract. Gas insulated substation ppt pdf presentation 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. Prepared by the subcommittee on the design of substation structures of the committee on electrical.
Electric field modelling in gasinsulated substation for. This course is based on terms used in ieee and iec regulations. A gasinsulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. A switchgear may be a simple openair isolator switch or it may be insulated by some other substance.
Gis substations have become a major component of the power network. Overhead lines and substation equipment can be protected against direct strokes to a considerable extent by using earth or ground wires, which shield the equipment. The major concern is that gas insulated substations are origins of transient over voltages with 1. They may only be used in the scope of the specified standards and the appropriate switchgearspecific technical data. Technical specification 4124 issue 2, november 2018. Compressed gas insulated substations cgis consist basically a conductor supported on insulators inside an enclosure which is filled with sulfur hexafluoride gas sf 6. Request free sample pdf gas insulated substation market insights. Abstract gas insulated substations are high voltage substations that are compact, requiring little maintenance when compared to airinsulated conventional substations. The metalenclosed gasinsulated switchgear is made as to ensure the best possible relationship between design, used materials, maintenance effort and maintenance intervals. A gas tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance. Gis technology originated in japan, where there was a substantial need to develop technology to make substations as compact as possible. Gas insulated substations conference 2018 in washington dc. Gas insulated substations in storm hardening and physical security reduction of environmental effect of substations 1. The live parts and supported on at resin insulators.
Ge designs, manufactures, installs and services a full range of stateoftheart gas insulated substations gis for utilities and industries worldwide. The start of the book presents the theory of gas insulated technology, and outlines reliability, design, safety, grounding and bonding, and factors for choosing gis. A gas insulated substation gis is a substation that uses a superior dielectric gas, sulfur hexafluoride sf6,high voltage. Ge provides a full range of gasinsulated substations gis for utilities and industries worldwide. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in sf6 gas inside grounded metal enclosures. Gis is a kind of metal enclosed switchgear that means, all the equipments of the electrical switchgear are enclosed by gas tight metal enclosure and sf 6 gas is used as.
Ge provides a full range of gas insulated substations gis for utilities and industries worldwide. The present invention relates to a device for monitoring a gas insulated highvoltage substation by measuring partial discharges, including an enclosure 11. 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 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.
The differences between air insulated substation engineering and gas insulated substation engineering are vast. Because of the very high frequency stress they exert on the equipment and their magnitude up to 3 pu, they constitute an important issue in the design of ultrahigh voltage gas insulated substations. Sf6 gas superior dielectric properties used at moderate pressure for phase to phase and phase to ground insulation preferred for voltage ratings of 72. Monitoring the quality of sf6 in gas insulated s witchgear. Monitoring of sf degradation in gis using frequency. Masanari meguro, the japan electrical manufacturers association jema japan abstract a joint study of technical standards for recycling and handling of sf 6 gas was conducted from 1996. The portfolio includes gis solutions from 60 to 800 kv, along with secondary products to maximize switchgear and network operation. Its surge impedance is lower than that of the overhead lines. Study of gas insulated substation and its comparison with air. The basic stimulus for partial discharges generation is local, high value electric field, greater than the inception one. Combined with a significantly reduced footprint and sf6 gas insulation, toshiba gis can operate in unconventional indoor spaces while maintaining its.
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. Study of gas insulated substation and its comparison with. Replacing sf6 in electrical gasinsulated switchgear. Abstract this paper basically evaluates the two types of substation namely ais and gis on the basis of the lifecycle cost method, reliability, and environmental effects. Lsis who has been a leader in electricity and automation in. They have disadvantages that cause serious concerns. With gis experience spanning 50 years across a wide range of industries and applications, ge is a leader in the. Shielding methods do not permit an arc to form between the conductor and ground. Gas insulated substation gis vs conventional outdoor substation ais by engr. Earthing switch slowoperating earthing switch are used for protection purpose when work is being done in the substation, but are operated only when it is certain that the highvoltage system is not energized. The metalenclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. Sulphur hexaflouride sf6 gas the primary insulating medium. Abstract this paper presents the most significant results of a very fast transient overvoltages generated due to switching operations have been analyzed and presented. All the live parts are enclosed in metal housings filled with sf6 gas.
Show full abstract substation gis located in the north of iran. With gis experience spanning 50 years across a wide range of industries and applications. This paper introduces modeling of a 3phase 2kv gas insulated substation. An overview on gis gas insulated substation engineering. The development focus for ais was on circuit breaker cb technology that would increase reliability and reduce maintenance. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. Since the contact speed of disconnector switches is low, restriking occurs many times before the current interruption is completed. Very fast transients are surge overvoltages created for example when opening or closing a disconnector switch ds. Abstract gas insulated substations provide a best solution to the problem of reduced land availability in the metropolitan areas. Gas insulation substation equipment authorstream presentation.
Any other use constitutes improper use and may result in dangers and damage. Is that the highvoltage current carrying parts are within a metal enclosure and are held in a concentric configuration by cast epoxy spacer. There are five major considerations in the differences between the two high voltage substations. The third chapter presents the technology, covering the following in detail. Pdf maintenance method based on risk estimation for. This means that gas insulated substation can be built in any metropolitan city. The magnetic field produced by an alternating current flowing in the conductor of the gas insulatedbus bars in gas insulated substations induces eddy currents in the metal parts nearby.
Tom antonucci for the benefit of ieee, particularly the student members, with an interest to power systems. 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. In 1965 abb delivered the worlds first substation with gasinsulated switchgear gis. Toshibas gas insulated substation gis is a compact and highly economical substation solution for electric utilities, commercial, and industrial applications in densely populated cities. An overview on gis gas insulated substation engineering ieee foothill society pes chapter and ieee pes student chapter, cal poly pomona are pleased to sponsor a talk on the topic, an overview of gis substation engineering, by mr. Oliver soppart 1969 received his degree in electrical engineering dring. This problem can be solved by using gas insulated switchgear technology. These transients have traveling wave behavior and travel to external systems through. Iv general technical specification for 220kv sf6 gas insulated metal enclosed.