Professional certificate of competency in substation design control, protection and facility planning details. Substation lightning protection and earthing standard documents should be brought to the immediate attention of tasnetworks for resolution and no action must be taken that might result in a breach of. This paper is to provide information pertinent to safe earthing practice in substation. Design of earthing system of a 400230 kv gis substation with high soil. Home download center electrical software earthing mat design for a power substation ms excel spreadsheet what does this spreadsheet do. Gis substation are considered safe and complies with all recommended guides gis pdf\generallayout gis. Electrical earthing system design fundimentals and design. We use safegrid earthing software for the design of earth grid on complex renewable energy projects, including anaerobic digestion plants, wind farms and solar farms. We offer extensive training, covering both the use of safegrid software and earthing principles, to help you get the most out of your product. Ses offers the most powerful software packages in the industry. Such as for gis substations, lightning attachment studies and interference.
Before 1960s the design criterion of substation earthing system was low earth resistance. Gasinsulated switchgear transmission products siemens. Substation grounding softwareis the substation grounding grid design and analysis module specially designed to help engineers optimize the design of new grids and reinforce existing grids, of any shape, by virtue of easy to use, builtin danger point evaluation facilities. The gis substation has most of its electrical structure contained in sealed tubular enclosures. The superior dielectric and arc quenching properties of sf 6 gas allow a substantial reduction in the size of the switchgear and gis substations can therefore be smaller than conventional airinsulated substations. To meet the customers various requirements of todays substations, we, hyosung, design and manufacture a wide variety of sf 6 gasinsulatedswitchgear gis system. Design of earth grid for a 3311kv gis substation at a high soil resistivity site using cymgrd software. Abstractthispaper describes the design ofan earthing system for agas insulated switchgear gis substation using cymgrd software. Eaton s cymgrd software is a substation grounding grid design and analysis program specially developed to help engineers optimize the design of new grids and reinforce existing grids, of any.
The cross section of the buried cable should calculated in accordance with the value of the phasetoearth short. Perform the design of substation earthing so as to ensure safety of personnel and equipment under all conditions. Mortezaeei 2 1 electrical engineering department, seraj higher education institute, tabriz, iran, n. An earthing system for substation mainly consists of a buried grid comprising of interconnected horizontal conductors and vertical earthground rods forming an earth mat. Electrical engineers use powertools to perform harmonic analysis, transient stability analysis, short circuit analysis, and to determine demand load, voltage drop, arcflash hazard analysis and protective device coordination. Program is designed as per ansiieee 80 code, it calculates step potential of switchyard, touch potential of switchyard, total length of earthing mat conductor, size of earthing mat conductor and total number of earthing. Highvoltage equipment, substructures, cable ducts, wires, tubes, clamps, roads. Substation lightning protection and earthing standard.
Power systems analysis and simulation software are ubiquitous in electrical engineering practice. Cdegs earthing software shifting the system design industry. So, get this wrong and the subsequent electrical earthing system design may be flawed. Gas insulated switchgear and gis substation essentials.
The grounding grid provides a common ground for the electrical equipment as well all the metallic structures in the. The main ground grid design is performed according to ieee std. The design concept of equipotential ground grids in substation building as well as connection of gis enclosures to. This section defines the standard substation components. Refinement of preliminary design for substation switchyard. Design of earthing system of a 400230 kv gis substation with high. 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.
There are a variety of national and international standards available, which provide empirical formulae for the calculation of earthing design parameters and shock potential safety limits. Block diagram in figure 1 is the sort earthing studies of power networks and the algorithm can be expressed as. So, this innovative use of the software could open a door into a whole new field of problemsolving. Analysis of vfto across bushing in 765kv gas insulated substation using emtp software. However, this alternate technology has inevitably lead to a different set of problems to resolve. Engineering design of grounding grid in substations is. Home download center electrical software earthing mat design for substation. Major substations include all transmission and zone substations and switching.
The substation earthing layout design shall identify lightning spire and lightning shield wire placement whilst maintaining the required access and safety clearances in accordance with the substation design. Rahi1, 2abhas kumar singh, shashi kant gupta3, shilpa goyal4 electrical engineering department, national institute of technology, hamirpur, india1,2,3,4 abstract this paper presents the design of earthing system for 2 kv substations and simulation for. The substation design manual is not intended to replace asset management standards, but rather to act as a reference document that crossreferences existing standards and process documentation and plugs any gaps where asset management documentation does not exist. Define the initial conditions fault level, metallic return paths. The buried earth grid design is based on the soil resistivity of the substation site and the design is verified through simulationsto make sure that the attainable potentials are within the permissible limits ensuring safety of personnel as well as equipments. The function of an earthing and bonding system is to provide an earthing system connection to which transformer neutrals or earthing impedances may be connected in order to pass the maximum fault current. Pdf grounding system design in electrical substation. The ideal electrical design and circuit calculation software for electrical contractors. The real case study of grounding system design for 120 mva, 6924 kv distribution substation. Important formulas for designing a substation grid earthing system. The earthing system must be designed using latest version of the cdegs design software package. The earthing design process the design of an earthing system for a small distribution substation is, in essence, no different to that of any larger substation, and in fact can be more onerous due to. Rated isolation levels are fundamental parameters for the gis design and have a direct influence on the case diameter and, with this, a high cost influencein design. A complete array of auxiliary software tools are included in the cdegs suite to.
The manual is applicable for all substation projects regardless of internalexternal design delivery mode. Gis substation grounding, earthing, software ses india. Design of substation grounding grid using edsa software. In high and medium voltage air insulated substations ais the electromagnetic field, which causes are the static charges of bare cable and conductors and by the atmospheric conditions surges, induce voltages at nolive parts of the installation that create potential differences between metallic parts and ground and also between different points of. Substation design references ansi c37 series protection and control equipment ansi c57 series transformers ieee standard 80 substation. Jul 26, 2017 the substation grounding system comprises of a grid earth mat formed by a horizontal buried conductors. Their primary function is the same as earthing switches in air insulated substations and non faultinitiating earthing switches in gis.
Major substation earthing design, construct and commissioning. So, maybe you have a gis gas insulated switchgear substation. The buried earth grid design is based on the overdesigned hence cost effective. Substation engineering ais and gis substations beta. The design of earthing system for 230 kv substation is challenging task. Scribd is the worlds largest social reading and publishing site. The cymgrd software is a substation grounding grid design and analysis program specially developed to help engineers optimize the design of new grids and.
To set out the minimum standards for the earthing system design of major substations in the companys network. Services range from conceptual and detailed both primary and secondary design, civilstructural as well as protection and scada settings and onsite. Earthing mat design for substation spreadsheet photo by input fields as per ansiieee std 801986 code. The substation design manual is not intended to replace asset management standards, but rather. Also for modelling above ground earthing systems using cdegs software. Ehvehv and ehvhv 1 substations are an important element of the electricity transmission network of a country or of a large area of a country and their functions are. Design and analysis of ground grid system for substation. Substation earthing system design underground horizontal earth mesh matgrid the mesh is formed by placing mild steel bars placed in x and y directions in mesh formation in the soil at a depth of about 0.
A safety is one major concern in the operation and design of an electrical power system. The ergon energy design philosophy is to provide substations. Design of earth grid for a 3311kv gis substation at a high soil. Design appropriate protection against the direct and indirect effects of lightning strikes on substations and the incomingoutgoing overhead lines. Design of substation grounding grid using edsa software abstract. This paper is concerned with earthing practices and design for particular 6611kv outdoor ac substation for power frequency in the range of 50 hz.
Design of grounding system for gis indoor substation. Incidentally, computer people amongst us would call this gigo garbage in garbage out. Pdf design of earthing system for 230 kv high voltage. Cdegs earthing software shifting the system design. Grounding earthing designs for systems of any size in all kinds of environments. The soil structure is a foundational requirement for every electrical earthing system design. There is a continuous increase in the application of gas insulated switchgear gis into electric power transmission substations. Expert technical training for safegrid earthing software. Determine the minimum size of the earthing conductors required for the main earth grid.
Design and simulation of a grounding grid for gis substation. The resultant substation earthing design tool simplifies the design process and. Conventional switching and gis substations with or without transformers. Design of earth grid for a 3311kv gis substation at a high. High speed earthing switches are unique to gis design as they are not normally used in air insulated substations. To fill the lack of such suitable and economical optimal design software in north american industry, a software. Operation and maintenance of a gas insulated substation. Dc substation gis and lightening effects are not covered in this paper. The design concept of equipotential ground grids in substation building as well as connection of gis enclosures to main ground grid is described. All the power equipments and metallic parts on site are earthed by connecting them to this buried earth mat. Earth resistance substation design for both greenfield and brownfield substation projects to meet the performance expected by ergon energy. Home technical articles gis vs ais substation earthing aeg gis gas insulated switchgear up to 420 kv compressed sf6 gas used in mv and hv switchgears as an insulating medium has led to the development of compact gasinsulated substation.
Software products ses india grounding, earthing, software. Two day national conference rteece2014 17th,18th january 2014 89 criterion for substation earthing system was low eart hing. Design of earth grid for a 3311kv gis substation at a. Moreover, the software output also has been seen for crosschecking of theoretical calculation. The designer must use suitable cdegs earthing design module to model the grid and any third party infrastructure if it has been affected by development of the relevant substation. Optimized design of substation grounding system using newly developed ieee compliant software issn. Program is designed as per ansiieee 80 code, it calculates step potential of switchyard, touch potential of switchyard, total length of earthing mat conductor, size of earthing mat conductor and total. The construction scope of work includes the procurement, installation and commissioning of the lighting protection system such as lightning masts and associated earth stakes, overhead earth wires, down conductors, fittings and connections to the substation earthing. Earthing system is made of a mesh of buried bare copper cable, with additional earth rods, and shall be calculated, being recommended to use ieee std. Rural substations are not that difficult to design so it is not expensive. Whether you are confronted with a complex grounding design, emf studies, electromagnetic compatibility and interference problems or a lightningsurge study, you can rely on the accuracy, effectiveness and integrity of our applications for a realistic, optimized solution.
The earthing design process the design of an earthing system for a small distribution substation is, in essence, no different to that of any larger substation, and in fact can be more onerous due to close proximity to other systemsservices, and direct connection via cable sheaths to consumers premises. Finite element analysis fea software analysis using cdegs. The grounding system design for gis indoor substation is proposed in this paper. Grounding earthing designs for systems of any size in all kinds of environments conventional switching and gis substations with or without transformers thermal, geothermal and nuclear power plants solar and wind farms hydroelectric complexes hvdc stations with onshore and offshore electrodes.
Design of earthing grounding system in a substation grid. So the software should be capable of meddling above ground and below ground structures. Earthing mat design for a power substation ms excel. Professional certificate of competency in substation. Introduction to substation earthing grid in high and medium voltage 1 air insulated substations ais the electromagnetic field, which causes are the static charges of bare cable and conductors and by. Earth mat designing of substation free download as powerpoint presentation. Bs7354 1990 code of practice for design of high voltage open terminal stations. Betas substation projects have ranged from 15kv to 500kv. If you have a concern about your electrical earthing system design or the accuracy of the soil resistivity. Optimized design of substation grounding system using newly. Grounding earthing designs for systems of any size in all kinds of environments conventional switching and gis substations with or without transformers thermal, geothermal and nuclear power plants solar. Program is designed as per ansiieee 80 code, it calculates step potential of.
Earthing mat design for a power substation ms excel spreadsheet. Ensure that the earthing design is appropriate to prevent dangerous step and touch potentials if this is necessary. Groundingearthing design package for large substations, power plants, hvdc substations and electrode design, solar power plants and hydroelectric power plants. One type of substation is an open air substation, which is the traditional design that uses the insulation properties of ambient air as an external insulating medium. The earthing calculation aids in the proper design of the earthing system.
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. Optimized design of substation grounding system using. The cymgrd software is a substation grounding grid design and analysis program specially developed to help engineers optimize the design of new grids and reinforce existing grids, of any shape, by virtue. Services range from conceptual and detailed both primary and secondary design.
The siemens range of gasinsulated switchgear gis, for rated voltages from 72. Control, protection and facility planning professional certificate of competency in substation design. These conductive enclosures, underground grounding grid and above ground bus bars, all contribute to the grounding system. This paper presents an accurate electromagnetic field theory method to model and analyze a realistic grounding system involving gasinsulated substation g. A choice of delivery option group, private or online is available to suit your particular needs. Earthing design simple overview earthing design is a complex, iterative, process. Abstractthispaper describes the design ofan earthing system for agas insulated switchgear gis substation using. Initially, they were used to quickly solve the nonlinear load flow problem and calculate short circuit currents, but their use has been extended to many other areas such as power system stability, protection and coordination, contingency. Can u send me the details required to design an earth mat for 230110kv gis substation which the area consist. Substation earthing design substation earthing is critical both to the operational performance of the power system, and the provision of a safe working environment.
Earthing design of 11kv and 33kv rural substations in the uk. Gas insulated substation grounding system design using the. Rahi1, 2abhas kumar singh, shashi kant gupta3, shilpa goyal4 electrical engineering department, national institute of technology, hamirpur, india1,2,3,4 abstract this paper presents the design of earthing system for 2 kv substations. The first step in designing a power substation is to design an earthing and bonding system go to content earthing and bonding. Particularly useful when studying overground systems. Professional certificate of competency in substation design. The cymgrd software is a substation grounding grid design and analysis program specially developed to help engineers optimize the design of new grids and reinforce existing grids, of any shape, by virtue of easy to use, builtin danger point evaluation facilities. Iacsit international journal of engineering and technology, vol.
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