Covers the design of the ground grid for safety and proper operation. Earthing System In a Substation. The substation design manual is not intended to replace Asset Management Standards, but rather to act as a reference document that cross-references existing standards and process documentation and plugs any gaps where Asset Management documentation does not exist. Full 3D CAD models of the substations, plus. Compact transition poles are convenient for areas where siting a new substation is not practical and, in particular, for “hybrid” lines where there are intermediate underground dips in an otherwise overhead line. Decision: The Authority1 has decided to approve2 this modification Target audience: Distribution licensees, Distribution Code Review Panel,. This paper is a case study for the lightning shielding design of a substation transformer addition and feeder section expansion project. Pictured: HV Substation Earthing. HarperCollins. Several commercially available programs were used to perform the calculations described in this chapter. Earth mat designing of substation - Free download as Powerpoint Presentation (. The two earth mats are then interconnected to ensure that the two shafts remain at the same potential. The proposed design ensures protection of substation personnel from danger and affords safe operation of the entire substation facilities and increased overall system reliability. org 1 Technical Specification 41-24 Issue <1> 2017 Guidelines for the Design, Installation, Testing and. It was a great software tool I got from "Orloff". Braze to earth tape going direct to switch handle or mech box Always make the connection visible for inspection If the tape connection is. Classification of Mv/Lv Substation Transformer. lighting design 24 8. Over the Years Grounding Design Terms and DefinitionsProcedures Have Been Developed as Well as Appropriate Standards, Most Notable: •ANSI/IEEE Std 80-2000, IEEE Guide for Safety in AC Substation Grounding. Unknown said At Mister Sparky, we offer a wide selection of electrical services to choose from. The earthing design of a primary substation shall be in accordance with the standard drawing (No 900215-102). a new method to address uncertainties associated with designing substation earthing grid system. Earthing ofsurge arresters is through the earthing system. [email protected] This may become dangerously large, creating the risk of a flash over, if attention is not paid to. One major use of a car mat is to keep mud, sand and snow from contacting the carpeted floors. A geotech survey of the substation needs to be performed to obtain the soil resistivity data to enable this study. Important formulas for Designing a Substation Grid Earthing System. National Grid Earthing Technical Specification TS 3. This paper presents the design of earthing system for 132 KV substations and simulation for calculation of required parameters. Back flashover is the arcing between earth wire and a single phase wire. 18 (a) Typical Layout for Powerhouse Earth mat for 2 x 1. DESIGN OF EARTHING SYSTEM FOR GRID STATIONS AND PROBLEMS ASSOCIATED WITH REMEDIAL MEASURES. Secondary Substations Earthing Design & Construction Policy (Document not available at time of publishing) ESDD-01-006 Standard Low Voltage Connection Arrangements ESDD-02-003 Low Voltage Connection Arrangements in Residential Developments ESDD-02-012 Framework for Design & Planning of LV Housing Developments, including U/G. The design of substation earth grids is involved with limiting grid potential rise (GPR), which is a result of earth fault currents that flow to earth through an earth grid impedance. Some of the major changes are! Case-sensitive function and directory names on all platforms. Can't do the Earth mat design separately for each step and finally connect each steps together. Basic Requirement of Earth-mat Design ii. 2 Design Concept, construction & performance of SF6 GIS. All the data used for analysis is real time and collected from 220/132 KV substation under M. Research Professor, Syracuse University. energynetworks. 8 KV SUBSTATION. Back flashover is the arcing between earth wire and a single phase wire. E11 : General Electrical Earthing and Lightning Protection following earth conductors shall be installed via the cable ducts: Two 70 mm separate conductors, from the medium-voltage switchgear earth bar or earth bolt to the substation earth bar. DESIGN OF GROUNDING SYSTEMS IN SUBSTATIONS BY ETAP INTELLIGENT SOFTWARE N. Icc (kA/1 s) - 20 Installation on Fixed Points -Ø 20 mm MT-2951 range Composition - 3 Clamps MT-1911-E, 1 MT-1911 Connection Set - 3 Cables 95sqmm, 1 earth cable 35sqmm Sticks - CF-5-40-E CATU Portable Eart. CIVIL DESIGN We have the necessary Link Up accreditations to produce these designs for clients and have many years’ experience in civil design for Network Rail, Signalling Solutions Ltd and other Tier One contractors. These are the substation earth electrode system, e. Short title and commencement 2. architectural/civil design 6 6. INSTITUTE OF ENGINEERING & TECHNOLOGY, SAVLI, Vadodara, India, dhruv. The design is in accordance with BS 8002:1994. 3 x md ammeters + ct‛s 800/5 – to measure the total lt. substation ground grid and earth. Comfortable, durable, and convenient to use in many different settings, the Earthing® Universal Mat is a best selling and affordable way to start grounding. Types Of Earthing Systems 23/02/2011 by Lemau 25 Comments Last post i already discuss about Earthing system classification. It is desirable that the substation grounding provides a near zero resistance to remote earth. Abstract--This paper proposes a method of grounding system analysis in the presence of satellite electrode for hilly region. Secondary Substations Earthing Design & Construction Policy (Document not available at time of publishing) ESDD-01-006 Standard Low Voltage Connection Arrangements ESDD-02-003 Low Voltage Connection Arrangements in Residential Developments ESDD-02-012 Framework for Design & Planning of LV Housing Developments, including U/G. individual users as an estimating tool for new substation and/or substation modification projects. Emergency substations and power transformers - Substations fact sheet (English - pdf - Brochure) Mobile Substations - Power on the Move (English - pdf - Brochure) Transmission and distribution substations - Pamphlet (English - pdf - Brochure) Power Technologies from ABB - Innovative products, dependable systems and integrated solutions (English - pdf - Brochure) Substations that can hide in a city. 5’ and 15’ widths • Available in green or tan Savings & Advantages You can expect this highly engineered performance product to provide substantial cost savings over traditional hard armored solutions. Distribution Network Standard. On electricity networks with a system voltage of 240 V to 1. Whitehead, Schweitzer Engineering Laboratories, Inc. These rules relied on metallic sheathed cables providing a grading effect (hence controlling. – The comprehensive earth pressure theories evolving from the original Coulomb and. All substation earthing systems must be designed to ensure the following functional requirements are met: a) Earthing systems must be designed to have 100% availability for the life of the substation. On completion, we are happy to make a recommendation for suitable electrical safety equipment at each switchroom location. The purpose of this Design Report is to give details on: • The design solution and the reasoning behind it, which includes the factors underpinning the design (environmental conditions, standards, etc) and the. Ashwani Kumar, Member, IEEE, and Hans R. • Provide guidelines for the Utility Power Supplies to the Traction Power Substations. AGM (Absorbed Glass Mat) batteries The electrolyte in AGM batteries is completely absorbed in separators consisting of matted glass fibers. Grounding provides amazing healing, calming and balancing effects on our bodies. This current transformer has turns ratio 50/5 A or 100/5 A and is mounted between neutral. Combined HV-LV earthing of substations in the built environment. Part 2 will cover the tolerable step and Touch voltage. Get an introduction to technical requirements, configuration philosophies, design practices, information sources and work processes. Agrawal 1,2,3BE Student123, Department Of Electrical Engineering 4Proffessor4, Department Of Electrical Engineering KDK College of Engineering, Nagpur, Maharashtra, India Abstract— transmission. engineering applications. GROUNDING DESIGN ANALYSIS AYDINER, Mustafa Güçlü. An additional computer program is developed to implement the formulations of the related AC substation standards (IEEE, IEE, and Turkish National Regulations). NGTS 1 Overview, National Grid System. FOREWORD This Specification relating to main earthing systems in substations is a companion document. If the reprint or republication includes copyrighted material, the credit should also state: “Anyone wishing to make further use of copyrighted material, by itself and apart from this text, should seek necessary permission directly from the proprietors. Compact transition poles are convenient for areas where siting a new substation is not practical and, in particular, for “hybrid” lines where there are intermediate underground dips in an otherwise overhead line. The earthing system shall comprise of earth electrodes at substation and other convenient places, with an interconnecting earth grid. 7 Substation Fences The earthing of metallic fences around a substation is of vital importance because dangerous touch potentials can be involved and the fence is often accessible to the general public. T&D provide expert technical support, competitive prices and delivery from stock for substation earthing projects – all earthing products are available to meet the design criteria and construction specification of the earthing systems for substations and equipment for 33kV and 132kV substations. the station earth electrode system, which raises the potential of the system relative to that of true earth. Substation earthing system design optimisation through the application of quantified risk analysis Tutorial Advisory Group B3. I am using Ground Mat to check the designs of a number of external substations in an existing factory. 80 and 81 - A guide for Safety in AC Substation Grounding; BS 7340 Code of practice for protective earthing of electrical installation. Grounding (ground). Volume IX, Substation Structures. Grounding provides amazing healing, calming and balancing effects on our bodies. DISTRIBUTION EARTHING MANUAL Page 1 of 65 THIS DOCUMENT IS UNCONTROLLED IF PRINTED OR SAVED. PDF Reader for Windows 10 is a lightweight and full-featured PDF viewer used to open, read, view, review, and print Adobe PDF files. Tabatabaei 1 S. In this paper, soil resistivity and ground resistance at two different sites near an electrical substation are measured using a grounding system grid with and without rods. 5 The resultant earth horizontal force is assumed to act perpendicular to. Earth Rod Dimensions Depending on the design specification of the earthing system and the corresponding earthing wells, various earth rods of different dimensions would be incorporated. Substation grounding grid design and analysis module is specially designed to help engineers optimize the design of new grids and reinforce existing grids, of any shape, by virtue of easy to use, built-in danger point evaluation facilities. DESIGN CALCULATIONS The design of the earth electrode system shall be based on the approved earth resistivity data and the systems fault currents and their duration. Feb 2010 Civil Design Criteria - A1 ENGINEERING GROUP CIVIL DESIGN CRITERIA FOR ROAD AND RAIL TRANSIT SYSTEMS E/GD/09/106/A1 3. X Y Z 0 200 400 600 800 1000 100 200 300 400 500 600 700 (d) C4- One surge arrester on Point Z. 5 The design of the earth electrode system (whether this is as a result of adding to an existing. Cast Iron Plate Earthing d. For substations contracted on turnkey basis the substation contractor shall be responsible for design, material supply, transport, erection, and installation and commissioning as well as having the full responsibility for civil works including design and construction of transformer foundations and control building. Can you help me on Earth Mat designing of a Electrical Sub-station under the following points-A>Procedure of designing of a Earth Mat. data collectors, through final design integrated into AutoCAD mapping and design systems. Earthed: Connected to the general mass of earth. Earth mats manufactured from high conductivity copper tape also reduce the danger of exposure to high step and touch voltages to substation and authorised personnel working on high voltage switching providing reliable earthing in high fault current and step potential avoidance applications, such as high voltage substations and switchrooms. Could u please explain me how to do the earth mat design for 220/132/33 kV Outdoor GSS which have 5 steps (135m, 138m, 141m, 144m, 147m). The grid consists of a number of meshes and connected to several earth electrodes driven at intervals. 06g Horizontal 0. This causes them to be spillproof, meaning they don’t leak acid like a flooded design if tipped on their side. In this paper. However after doing some reading on the internet I have found that some utility companies allow a 20ohm combined HV/LV earth value if the site is designated as "cold" whereby the substation is fed via an underground cable with a continuous metallic return path, as the majority of the fault current will return back via the sheath. 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. MAIN COMPONENTS OF SUBSTATION Station Earthing System includes Earth Mat and Earth electrodes placed below ground level. Clearance Calculation in Air Insulated Substations. How Substation Grounds are Supposed to Work The methodology and construction specs vary, but the design criteria is the same. Nevzat ÖZAY February 2009, 104 pages This thesis investigates problematic cases in AC substation grounding system design. Actual clearances around substations and enclosures within substations shall be subject to the Constructor obtaining the express prior approval of SPEN with respect to requirements for operation and maintenance of the substation, plant access and cable/earth mat systems. (vi) F - Earthing 121-126 (vii) G - Guidelines for Selection and Application of RCCBs (RCDs) 127-130 (viii) H - Principles of Protection of Building against Lightning 131-135 (ix) I - Average Number of Thunderstorm Days in the Year 136-138 (x) J - Weighting Factor for Overall Assessment of Risk for Lightning Protection System 139-140. Electricity substations, like overhead power lines and electrical appliances in the home, are sources of extremely low frequency (ELF) electromagnetic fields. Galvanised Steel Earth Mats can be either permanently installed and attached to the earthing system where maintenance is required. External Floating roof is where the roof floats on the product in an open tank and the roof is open to atmosphere. Student 2,3Assistant Professor 1,2,3 Department of Electrical Engineering 1, 2, 3 G. Direct Stroke Lightning Protection calculation. A protective conductor connecting the main earth terminal or bar to the earth electrode. Code Of practice for earthing Guide for Safety in AC Substation Grounding 3M. Actual clearances around substations and enclosures within substations shall be subject to the Constructor obtaining the express prior approval of SPEN with respect to requirements for operation and maintenance of the substation, plant access and cable/earth mat systems. Also, a large number of factors such as the geometrical proportions of the grid, its depth, the type of grid conductors and whether or not grounding rods are attached to the grid are essential. The new cable route required an existing 132kV overhead line to be terminated at two locations to receive the new cable circuits. Federal and state environmental permit information was also included in this document for reference. repeating step (2) for different protection configurations. MODERN APPROACH TO EARTHING SYSTEM DESIGN AND ITS ANALYSIS USING ETAP INTELLIGENT SOFTWARE Prof. Most often, the older relay gets replaced with a newer relay with the rest of the installation such as Current Transformer (CT) and lead. Diode-grounded systems contain a direct metallic connection of the rectifier bus to the earthing mats at substations, but through a diode circuit. ! Nested functions. Moreover, mobile substation is a trailer mounted power solution and can be installed in a limited space and can be easily relocated without difficulty. 1 Grounding electrodes for buildings, industrial installations and substations 22/799 22. In order to ensure the proper functioning of substations and related equipment such as line-mounted switches and capacitors, most utilities use SCADA (supervisory control and. pdf), Text File (. Grounding provides amazing healing, calming and balancing effects on our bodies. Cost Effective Grounding Grid Design for Substation Soni M , Dr. 0 Content - 1 June 2012 CODE OF PRACTICE 101 FOR DISTRIBUTION SUBSTATION DESIGN VERSION 12. 3 Safe Design, Construction, Operation and Maintenance (1) An electricity distributor must design, construct, operate and maintain its aerial lines, underground lines, substations, equipment and metering with reasonable care to avoid injury to any persons or damage to property or the environment and. Low-Impedance Electrical Earthing Grounding for problem soils including rock. backfill is recommended to improve earth contact resistance. (c) The resistance of the surrounding body of earth. To set out the minimum standards for the earthing system design of major substations in the company's network. Ormazabal's miniSUB is a walk-in type coverless underground compact Transformer Substation designed in accordance with the EN 61330 standard for use in public Medium- Voltage (MV) electrical distribution networks of up to 24 kV. Range may include but is not limited to installation following work plan and design for earth mat. It is envisaged that each design drawing will have on it a resistance valuethat needs to be achieved and any other remedial earthing work requiredto ensure touch voltage limits are satisfied, all of which are derived by undertaking alevel of earthing design. STANDARD CROWFOOT EARTH 25mm x 3mm copper tape x 5m long joined to a 70mm2 BCEW tail 2m long. d) Earthing mat geometry (Area covered by Earth mat). 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, built-in danger point evaluation facilities. Substation and utility battery and charging systems for AC / DC power systems for utility substations, recloser and control systems. n Fence is outside of ground grid area, but is not connected to the substation ground grid. Testing and Inspection of Bonding/Grounding systems. transmission lines and substations are all unique, and the cost of a specific line or substation may be significantly different than the costs provided here due to a variety of factors. ENA TS 41–24. STANDARD PARAMETER OF 800 KV CLASS TRANSMIISSION SYSTEM IN INDIA PREFACE Earlier in the year 1990 Central Electricity Authority (CEA) brought out a report detailing parameters of the 800 kV class equipment and transmission line material based on the recommendations of Working Groups constituted following the. • All plant and main cables shall be sized to take account of credible future developments. Earthing system thus design must be easily maintained and future expansion must be taken into account while designing the dimensions of earth mat. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. The rise of the earth potential at the station will thus be (I1 - I2) Z volts. Testing and Commissioning Procedure for Electrical Installation 1. It will also cover correction. These ground connection points are located to accommodate standard. The ground system has three purposes, all of equal importance. The substation earthing layout design shall identify lightning spire and lightning shield wire. Smaller facilities can use these design guides also, but such an approach may be too costly. Category(ies) of project activity-CH4 recovery - Electricity generation for a system A. •IEEE Std 487-2007, Recommended Practice for the Protection of Wire-Line Communication Facilities Serving Electric Supply Locations. “Seismic design of reinforced concrete mat foundations: A guide for practicing engineers,” NEHRP Seismic Design Technical Brief No. Entry and inspection 6. 4% from 2018 to 2025 according to Verified Market Research study. Changing the distance from the lightning stroke location to the entrance of the substation. The former risk arises mainly in connection with large electrode systems as at power stations and substation. 80 and 81 - A guide for Safety in AC Substation Grounding; BS 7340 Code of practice for protective earthing of electrical installation. The glass mats in AGM batteries are wrapped around the positive plate, which helps prevent. The diode circuit allows current to flow from the earthing mat to the negative bus when a certain threshold voltage is reached. The earthing of surge arresters is another example of functional earthing, but this is not covered in the present document. A CT is mounted on the earthing conductor and is used to energize a simple instantaneous relay as shown in Figure 4-1. Soil resistivity tests were conducted at project site area and same data was used for doing design calculations. If the individual electrodes driven in the soil are measured it will have a fairly high. The purpose of this paper is provide knowledge about the GPR, substation grounding grid and step and touch potentials. Ground Mat: A solid metallic plate or a system of closely spaced bare conductors that are connected to and often placed in shallow depths above a ground grid or elsewhere at the earth surface, in order to. There are further requirements for the clearance between live parts and surrounding fences or vehicles driving through the substation. This may include earth resistivity tests coordination, design of the earth grid, electrodes, grid connections, equipment connections and remote earthing connections to conduct maximum earth fault currents without exceeding the maximum. Lightning protection, electrical systems, telecommunications systems and data systems). Secondary Substations Earthing Design & Construction Policy (Document not available at time of publishing) ESDD-01-006 Standard Low Voltage Connection Arrangements ESDD-02-003 Low Voltage Connection Arrangements in Residential Developments ESDD-02-012 Framework for Design & Planning of LV Housing Developments, including U/G. Another example would be, in designing of grounding system care should be taken to avoid parallel paths. E26: Measurement of the resistance to the mass of earth of electrode (X) using an earth-electrode-testing ohmmeter Notes ^ a b Where galvanised conducting materials are used for earth electrodes, sacrificial cathodic protection anodes may be necessary to avoid rapid corrosion of the electrodes where the soil is aggressive. PROJECT MANAGEMENT 1 4. Drawings and data required include all of the following that are applicable: a. • 2 KS 25-36 w substation e. Electric power may flow through several substations between generating plant and consumer, and may be changed i. As a global company, our expertise in research, design, and manufacturing spans multiple markets including floor covering, performance and protective textiles, specialty chemicals, healthcare, and operational excellence consulting for industrial manufacturers. Earth grounding is an intentional connection from a circuit conductor, usually the neutral, to a ground electrode placed in the earth. Compact transition poles are convenient for areas where siting a new substation is not practical and, in particular, for “hybrid” lines where there are intermediate underground dips in an otherwise overhead line. After drying the mats to 6-10% moisture content, sufficient glue is applied to ensure enough bonding between the overlapped areas. 5 Earth Pressures due to Compaction 230 6. through proper design utilizing the principles of the early 1900s have become standard practice for newly built transit systems and for new lines added to older transit systems. • Main design criteria • Introduction to earth resistance formulae • Comparison of ways to reduce the earth resistance Day two Design of Substation Earthing • Stages in the design of a LV distribution substation • Use of standard formulae to investigate design options and check compliance with standards • Design of the local. •Soil resistivity values can be assumed or don't matter. Feet can be placed on mat. Participants are paid a stipend for attending and travel and receive 30 CPE hours. Equipment grounding ensures that operating equipment within a structure is prop-erly. Touch and step potential hazard can be analyzed in a grounding study using IEEE Std. This book takes "conservative" shortcuts that allow the design of the grounding system to proceed without undue design effort. Cast Iron Plate Earthing d. ENA Technical Specification 41-24 Issue 2 - November 2018 Page 4 5. Grounding Tutorial Substation Ground System Design & Standard IEEE 80 Terry Klimchack Revised 03/10/14 2. DESIGN OF EARTHING SYSTEM FOR GRID STATIONS AND PROBLEMS ASSOCIATED WITH REMEDIAL MEASURES. Substation Illumination System- One Lot Safety Appliances C. These standards created and made available are for the construction of Ergon Energy. Earthing and bonding are important safety requirements for Electrical systems within the built environment. A separate document covers the design of substation and secondary system component of the Midwest Energy project. Appendix B, Foundation Design Load Tables, provides design require-ments for anchorage of the manufactured. Different lengths of earthing rods are used in. Active involvement in bid stage evaluation for all major equipments, participation in technical discussion with various vendors (pre bid & post Bid). INTRODUCTION 1 2. The overall substation earthing system impedance consists of three main components. Understanding Design, Installation, and Testing Methods T hat Promote Substation IED Resiliency for High-Altitude Electromagnetic Pulse Events Tim Minteer, Travis Mooney, Sharla Artz, and David E. 3 Strip or round conductor grounding 22/800 22. To provide an earth mat for connecting neutral points, equipment body, support structures to earth. Touch and step potential hazard can be analyzed in a grounding study using IEEE Std. substation, and its BIL requirement is the major cost factor in transformer design, reducing the substation BIL requirements can have a major impact on cost, risk, and ultimately the substation’s reliability. This guide contains problems focusing on Earth’s chang-ing magnetic field in time and space. 80 or IEC 479-1. 1 Earth Mat or Grid. The standard RailCorp Distribution Substation, unlike the standard design of local Electricity Distributors, employs a separate earthing system for the high voltage and the low voltage sides of the transformer. This course can be applied to the Electrical Engineering Certificate. Doctor of Philosophy. •Fences should always be independently. The design is then submitted to our mentor for verification KEYWORDS: 1) Bus bar 2) Control Cable 3) Earthing 4) Insulation-Coordination 5) Insulator 6). •IEEE Std 487-2007, Recommended Practice for the Protection of Wire-Line Communication Facilities Serving Electric Supply Locations. Comfortable, durable, and convenient to use in many different settings, the Earthing® Universal Mat is a best selling and affordable way to start grounding. 2 Non Standard Sites 7. 0 Methodology As per the various standards, we design the complete earthing system for our EHV sub-stations. Unlike most substation structure foundations, in addition to the loads from the equipment and fault currents, the pile system. These mentioned quantities depend on the grid parameters, which are its side lengths, radius of grid conductors and length of vertical rods. These are the substation earth electrode system, e. thickness of 0. The design calculations shall be to the approval of the Authority and shall be based on the methods given in the standards listed. substation earth resistance and hence on the amount of conductors/ground rods required to achieve a safe earthing Earth mat design can be done by manual calculations as design . Earth Mat designing of a Electrical Sub-station. The unit of earth resistivity, the ohm·meter, is defined as the resistance, in ohms, between opposite faces of a cube of earth one cubic meter in volume. Pictured: HV Substation Earthing. Substation Earthing This intensive three-day course will give you an insight into all aspects of substation earthing for low, medium and high voltage systems (distribution and transmission), to ensure safety, protection and regulatory compliance. The system flexibility allows integration with architectural design systems, and other leading engineering applications. With the Wenner four-pole equal-method, the soil resistivity is measured at both selected sites, one of which contains wet soil while the other contains dry soil. Frank Wenner of the U. substation Unique to each mobile substation Used by Foreman and Engineer on-site to verify correct installation Detailed steps to energize a ‘lights out’ system or parallel with substation transformer. Qualification of officers appointed to assist the Inspectors 5. LP consultants International Pvt Ltd 180,330 views. Design Guidelines & Procedures Version 20 © 19 June 2017 Page 2 of 297 4. Grounding system design analysis with current fault currents Ruighoek substation is examined with the main objective to assess its grounding system performance in terms of GPR, step- and touch potential. 1 Substation Interlocking Schemes. In this paper, soil resistivity and ground resistance at two different sites near an electrical substation are measured using a grounding system grid with and without rods. Eduardo has international experience in substation construction, O&M, and design in substations up to 500. The difference in potential is kept within the limits provided by IEEE and it is continuously. Introduction The procedures stated in this T&C Procedure cover the activities in preliminary tests and inspections, functional performance tests and the commissioning of newly completed installations and existing ones after major alteration. ” (Earth Resistance< 0. •Correct earthing design is a legal responsibility. CHAPTER 1 GENERAL 1. Abstract: Ground Potential Rise (GPR) is a concern in the design of substation grounding grid. Earthquake Resistant Building Construction Seminar and PPT with pdf report: Well, everyone knows about the earthquake and an earthquake is an oscillation or the quivering. The momentary difference in potential during an HV earth fault between the local site earth system where the fault current flows to earth (local site earth potential) e. It is envisaged by publishing the English version of “Design Recommendation for Storage Tanks and Their Supports” that the above unique design recommendation will be promoted to the overseas countries who are concerned on the design of storage tanks and the activities of the Architectural Institute of Japan will be introduced them too. Lightning Protection Design, Earthing System Design Lightning Protection for Buildings Design - Duration: 5:54. Grids are: a) Magnitude and duration of fault current. Electrical rubber mats are popular among industrial users because of it’s highly economical and easy to use features. The UFGS Master uses the latest CSI MasterFormat, therefore, as of January 2012, the UFGS Working Group decided to discontinue support of MasterFormat 1995. The electric and magnetic fields in the vicinity of electricity substations are well below the levels associated with established health effects. Different lengths of earthing rods are used in. 5 For calculations of allowable step and touch potentials, the resistivity of the surface material (rho sub s) shall be assumed to be 3,000 ohm-meters. Short title and commencement 2. The following section outlines the design aids and procedures available for evaluating the above list of factors when calculating earth pressure values. org Abstract Due to the complexity involved in the equations of modeling and the characteristics of soil in which the earth grid is to be. Structural ramps used for access or egress of equipment must be designed by a competent person qualified in structural design. HarperCollins. (c) The resistance of the surrounding body of earth. These are of importance of every practicing Engineer in charge of Substations. •Ground Mat -Substations usually include a ground mat. Eduardo obtained a BSEE with Power System emphasis from University of Costa Rica in 2002. To provide the path for discharging the earth currents from neutrals, faults, Surge Arresters, overheads shielding wires etc. Major substations include all transmission and zone substations and switching. Substation Illumination System- One Lot Safety Appliances C. for proper substation design in an electric power transmission facility or the power feed to a very large factory. c) Check combined earth resistance does not exceed 1 ohm. ground mat (earth) grounding tests plant other example plant °f owner example owner % asset id humidity ambient temp. Earthing of AC substation Basic Part -1, consist of basics about earthing Design in AC outdoor substation. When you combine them you will transmit a higher earth fault potential around all of your earthing system so you will need an earth mat insta. There are 2 types of floating roof: Internal floating roof is where the roof floats on the product in a fixed roof tank. Soil Resistivity Testing 1. It will also cover correction. The three-phase power leaves the generator and enters a transmission substation at the power plant. Low-Impedance Electrical Earthing Grounding for problem soils including rock. Appendix A, Foundation Design Concepts, shows design concepts suit-able for a variety of manufactured home types and site conditions. All known methods of shielding from direct. To produce an optimized design, better knowledge of the soil structure and the actual fault current flowing into the substation is needed. For substations contracted on turnkey basis the substation contractor shall be responsible for design, material supply, transport, erection, and installation and commissioning as well as having the full responsibility for civil works including design and construction of transformer foundations and control building. Correct electrical earthing and bonding procedures are essential to minimise the hazards associated with static electricity. Earthing ESB EARTHMAT Earth Stub Brass Earth Mats. Blume Earthquake Engineering Center at Stanford. final design of foundations and, when applicable, support structures. Foreword SCOPE This manual outlines the standard Energex distribution earthing practices for low voltage and 11kV systems. With the Wenner four-pole equal-method, the soil resistivity is measured at both selected sites, one of which contains wet soil while the other contains dry soil. and that the ground electrode is in firm contact with the earth. For example to. PLANNING and DESIGN GUIDE final. In Section 6, the fundamentals and issues related to the design of foundations to withstand a great earthquake are described. Distribution Network Standard. It was a great software tool I got from "Orloff". Pictured: HV Substation Earthing. This paper is a case study for the lightning shielding design of a substation transformer addition and feeder section expansion project. Earthing system thus design must be easily maintained and future expansion must be taken into account while designing the dimensions of earth mat. The fence is connected to a separate grounding conductor. result, appropriate substation grounding system must be designed, tested, and implemented in order to ensure the safety of the substation personnel and to enhance the life expectancy of the substation equipment and infrastructure. Many software programs assume all earth conductors. earth leakage 10ka + industrial plug + bulkhead in each compartment with switches 10. The earth electrodes shall be in conformity with IS 3043 of plates or pipes of GI with test links, internal connecting leads, earthing mixture of salt, charcoal, etc. Substation safety PART IV UNDERGROUND CABLES AND EQUIPMENT 12. These ground connection points are located to accommodate standard. ETAP Model For Earth Mat Design Proceedings of International Academic Conference on Electrical, Electronics and Computer Engineering, 8th Sept. Thompson, Schweitzer Engineering Laboratories, Inc. The design of the substation structure will be subject to the details provided in section 4 and GE-TGI-IG-0032 Substation Specification document. However, all equipment earthing connections to main earth mat/auxiliary earth mat etc are included in the scope of work of substation erection contractor. Earthing Design Calculation for main earth-mat of substation and generate earthing layouts and indicating equipment earthing. A protective conductor connecting the main earth terminal or bar to the earth electrode. To get the actual soil resistivity of the entire Sub-Station area, to arrive the designed average soil resistivity, measurement shall be done with different number of electrode spacing,. Suhail Aftab Qureshi*, Farhan Mahmood* * Abstract: The earthing system of a grid station is of the utmostimportance, primarily to ensure electrical safety for persons working withinor near the substation and also to limit any. The simulations are performed for various grounding scenarios of traction substations and the influence of stray current collection mats, under various scenarios, and effective. Input fields As per ANSI/IEEE Std 80-1986 code.