This includes the requirement of Major substation earthing system test. The first step in designing a power substation is to design an earthing and bonding system. Submit samples of conductors and other materials, as requested. This paper presents mathematical models on which developed software tool for calculation of the grounding system parameters is based. - Site wide earthing system testing and modelling for an underground mine. I have conducted multiple earthing studies including calculations and earthing layout drawings. Distribution voltages are typically medium voltage, between 2. Click Here To Download Brochure. 1 of the ESAA Substation Earthing Guide can be used as a guide for the. the substation earthing grid at both ends. Earth resistivity measurements. Power Systems Modelling and Fault Analysis Theory - Naser D. • Illumination design • Power system protection • Earthing and lighting/surge protection • System studies and calculations • Transformer Certification course in ELECTRICAL DESIGN ENGINEERING from Smart Brains Institute of Engineering Design and Research, Hyderabad, India. - Designing the Reinforcement Earthing for the substation. Consultants of Consultancy & Design Engineering of EHV Electrical - Substation Design, Switchyard Design, HV/LV Power Distribution System Design and Detail Engineering & Drawings Services for High Voltage Electrical Projects offered by Satcon, Kolkata, West Bengal. 0 Code of Practice for Earthing LV Networks and HV Distribution Substations 0500 1983 Code of Practice for Earthing This Code of Practice contains detailed policy and practice on earthing of LV Networks and HV distribution in the design. ETAP offers a suite of software used for power system modeling, analysis , real-time power management systems, load shedding, and railway traction power. Substation Connector Layouts. Whenever light. Electrical Grounding Analysis. Nowadays the Gas insulated substations (GIS) are gaining popularity due scarcity of sufficient size of land to construct an Air insulated outdoor substation. And even if the hand-calculations were done according to the standard, you could still end up with either an over engineered substation, or worse yet, an unsafe substation. The system earthing and safety earthing are interconnected and therefore fault current flowing through system ground raises the potential of the safety ground and also causes steep potential gradient in and around the Substation. OR you could use softwares for this. , are always erected outdoor. 2 In cases where the feeding post is located separately away from the traction substation, the buried rail shall be provided at the feeding post (where one terminal of the secondary winding of the traction power transformer of the substation is grounded). This paper presents the design of Earthing system for 400 KV substation and calculation of its parameters. Substation Earthing System Design Calculations. •If normal DNO practice is followed the design will be ok. 3 System earthing. pdf), Text File (. Erection of a 500/400/220kV AIS HV DC/DC Back-to Back Converter Substation with an installed capacity of 2x350MW (one and a half breaker scheme with single phase transformers between the 500/220kV side) on turn-key base in cooperation with SIEMENS AG Germany in order to connect the Georgian network with the Turkish network. Design of Grounding System for an Electrical Substation: An Overview Maneesh kumar, Gagandeep singh. To design a common earthing system for a short circuit level of 50 kA for 1 second. This is required as part of an HSE request. 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. We can design your electric system and transform existing drawings and files into state-of-the art intelligent power system models using the top-brand software like: Matlab/Simulink, Digsilent PowerFactory, EMTP/ATP and others. The grounding system in substation is very Continue ReadingSubstation Earthing System ( Grounding System ) - Earthing Mat. plus, in you data above, you didn't provide the weight of the person, ground fault current and many other parameters. Definition: The electrical substation is the part of a power system in which the voltage is transformed from high to low or low to high for transmission, distribution, transformation and switching. It is designed to help optimize grid design or reinforce existing grids of any shape. Substation Design Suite™ extends the power of Autodesk Inventor and AutoCAD Electrical to provide highly productive substation design tools for intelligent 3D design and intelligent wiring design. Please try again later. In this project, in 220 KV receiving station of, 33KV/11KV side earthing portion of substation design will be explored. result is a substation design process that guarantees faster response to customer specifi-cations in parallel with opti-mized system costs and high quality. The potential relative to a distant point on the Earth is highest at the point where current enters the ground, and declines with distance from the source. Incidentally, computer people amongst us would call this – GIGO (Garbage In = Garbage Out). designing for a low resistance earth interface grounding, designing earthing systems for onshore wind farm sites, safegrid earthing and grounding design software elek, earthing calculation open electrical, design of grounding systems in substations by etap, ground grid systems software ground grid design ieee, earthing system niordc, ground mat. All this data is fed to the ETAP and the grid design is done as shown in figure. Calculations of cable list, load summary list, load list, Illumination of all the plant, definition of the earthing network of the area of the plant and substation, design of the cable. Know Parts consuming power in HVAC Systems, Know types of motors, pumps used in HVAC systems; Know how to read the name plate for HVAC equipments, How to perform sizing calculations for disconnecting means of HVAC equipments, How to perform sizing calculations for Branch-Circuit Short-Circuit and Ground-Fault Protection Devices of HVAC equipments,. •Substation layout, Main cable route layout, Power plan, Hazardous area classification layout, Earthing & Lightning layout & Lighting layout. •Load flow calculations •HV distribution •Main and aux. Substation & switch station layout design; Co-ordination with civil designers; The wind turbines were successfully installed and connected to the 11kV distribution system to produce a maximum of 2. Design and application of protection schemes to any component of MV/LV reticulation system such as overhead power lines and underground cables, power transformers and substation busbars. The appendices also include supporting and background information on various aspects of substation earthing. Our services include Design & Engineering of Electrical, Civil, Structural, Controls, Protections and Substation Automation systems of the above mentioned type of projects. Cannot be understated! The Soil Structure is a foundational requirement for every electrical earthing system design. Optimized Design of Earthing System for Substations with High Soil Resistivity and Limited Plot Area Prudhvi Raj Bonda, Student and Mahesh K. Initially, they were used to quickly solve the non-linear 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 / reliability, economic modelling, etc. United States Department of Agriculture Rural Utilities Service RUS Bulletin 1724E-300 Issued June 2001 Design Guide for Rural Substations. ii) To determine the number of earth pits for earthing and lightning protection. This indicates that careful consideration should be given to the design of all earthing systems. MS excel Spreadsheet to help you find earthing values for substation. 0 Code of Practice for Earthing LV Networks and HV Distribution Substations 0500 1983 Code of Practice for Earthing This Code of Practice contains detailed policy and practice on earthing of LV Networks and HV distribution in the design. But separating the two earthing systems have disadvantages like higher short circuit current, low current flows. To undertake this unit, you should have a good grasp of electrical transmission technology and the level of design computation needed, and a working knowledge of power system engineering. v) Requirement of earthing material, supply & spreading of crushed stone/gravel for the. Even without the excel sheet you could calculate it. CBIP Manual on substation publication number : 223. calculation note that with proper surge arresters this energy can be significantly reduced which can significantly reduce the size and thus the cost of the cable. Modules of the developed software tool were used to conduct some calculations which are typical for designing of the grounding systems. Electrical design. Know Parts consuming power in HVAC Systems, Know types of motors, pumps used in HVAC systems; Know how to read the name plate for HVAC equipments, How to perform sizing calculations for disconnecting means of HVAC equipments, How to perform sizing calculations for Branch-Circuit Short-Circuit and Ground-Fault Protection Devices of HVAC equipments,. Services provided include: On-site soil resistivity testing as inputs to the calculations and modelling. ETAP offers a suite of software used for power system modeling, analysis , real-time power management systems, load shedding, and railway traction power. The existing electrical system owners should know all the electrical parameters of their own system, and may already have this information modelled with a suitable software package. The system ground connection, made by a system bonding jumper, is the path that allows fault currents to return to the source. Consultants of Substation Design Services - Detailed Design of High Voltage Mobile substation, 400/220/132kV GIS Substation Design & Engineering, 400kV Switchyard Design and Drawings and 330kV Switchyard Design and Drawings offered by Satcon, Kolkata, West Bengal. In general it is very much essential to take into consideration the seismic factors while designing the substation because it adds to the overall reliability of the system. 1 pa electrical technical documents. Soft steel has advantages over copper because of its low cost but since it has higher permeability and lower conductivity than copper, if the substation size is large and/or if the soil resistivity is low, the effective size (electrical size) of the grounding system consisting of steel conductors may increase significantly. of 33kV system voltage. Nothing but a mini size WEG Unit Substation with a max. Main Report. • Current Transformer and Voltage transformer sizing calculation based on IEC standard. You can contact us 24 hours a day, 7 days a week, 365 day a year. for high voltage system earthing (1000 V AC and higher). We provide a comprehensive review of recent developments in the related standards, specifications and earthing arrangements. In our opinion computer modeling is the only viable and ethical way to design a substation grounding grid. Gulf Power Electromechanical has a wide range of services and experience in various fields and sectors of industrial and commercial markets across UAE. To undertake this unit, you should have a good grasp of electrical transmission technology and the level of design computation needed, and a working knowledge of power system engineering. It also specifies procedures and acceptable practice by which these shall be achieved. 6 Calculations to design the main earth system shall be carried out using the MALZ module of normally be relied upon to provide an earth electrode as part of the earthing system design. New substation - Complete secondary design of control/protection systems and all auxiliary and telecom cubicles and interfaces. High Voltage Earthing Design Services. This is the equivalent of supplying 840 homes. Cannot be understated! The Soil Structure is a foundational requirement for every electrical earthing system design. The earthing system in a plant / facility is very important for a few reasons, all of which are related to either the protection of people and equipment and/or the optimal operation of the electrical system. In general it is very much essential to take into consideration the seismic factors while designing the substation because it adds to the overall reliability of the system. This paper presents the design of earthing system for 132 KV substations and simulation for calculation of required parameters. This paper presents mathematical models on which developed software tool for calculation of the grounding system parameters is based. Further to this, I have produced several lightning protection system designs to BS 62305. org 1 Technical Specification 41-24 Issue <1> 2016 Guidelines for the Design, Installation, Testing. Substation grounding grid design therefore requires calculating of. Primary functions of a safe earthing system are There are national and international standards available, which provide empirical formulae for the calculation of earthing design parameters and shock potential safety limits. 66/11 kV DISTRIBUTION SUBSTATION DESIGN Mr. Important terminology is discussed including Grid Potential Rise, touch and step voltages and current distribution. MODULE 2: EXAMPLE OF SWITCHYARD EARTHING SYSTEM DESIGN. Construction & Design of 3 Nos. 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 infrastructure. - 3D Modeling of panels, equipments and junction boxes by using Elecdes Software. The cable contractor is to provide and terminate the earthing 50 mm x 4 mm copper tape from the link box at the outdoor sealing ends or the splitter box to the switchyard or substation main earth. Before 1960s the design criterion of substation earthing system was "low earth resistance. Perform the design of substation earthing so as to ensure safety of personnel and equipment under all conditions; Design appropriate protection against the direct and indirect effects of lightning strikes on substations and the incoming/outgoing overhead lines. •Experience in Cathodic protection, Fire alarm and Communication system. Samples of Earthing / Grounding Materials. txt) or read online for free. Deliverables includes single line diagrams, substation layouts, hazardous area classification layouts, cable sizing, load calculations, equipment datasheets & specifications, material requisitions, cable schedules, earthing layouts, cable routing layouts, lighting layouts, electrical & instrument interface diagrams, standard installation. • Current Transformer and Voltage transformer sizing calculation based on IEC standard. This extended earthing system requires design optimisation for an economical solution. Covers the design of bus support structures and connectors. Earthing Mat Design Calculation Sheet - Free download as Excel Spreadsheet (. ('Earth grid' i. Construction & Design of 3 Nos. 2 SOIL RESISTIVITY TESTING PROCEDURE GUIDELINES The purpose of resistivity testing is to obtain a set of measurements which may be interpreted to yield an equivalent model for the electrical performance of the earth, as seen by the particular earthing system. 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 designer or builder of the distribution substation should coordinate with Senior Planning and Design Manager of CLP Power for the provisions of the earthing installation. Detailed construction requirements are ecified within the sp Overhead Line Manual, Jointing Manual and Substations and Plant (SP) policy series. In the event that the system does not achieve compliance with the requirements for touch potential then the Earthing Services team would identify that further design works are required to control the fault. Earthing and lightning protection system design; interface with civil. ERICO has met the standards and requirements of the Registered Continuing Education Providers Program. -Design of distribution boards and control panels-Load calculations-Cable and breaker sizing-Design of earthing systems-Drawing of single line and connection diagrams. guidance on the design and calculation of ground electrodes. 6 Calculations to design the main earth system shall be carried out using the MALZ module of. 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. Creation of an earth-grid model using CAD services This model is then used within CDEGS (R) software to asses:. AC Substation Grounding Requirements Calculator Spreadsheet, The intent of this calculator is to provide information pertinent to safe grounding practices in ac substation design. In effort to secure the earthing system. And even if the hand-calculations were done according to the standard, you could still end up with either an over engineered substation, or worse yet, an unsafe substation. The design of the earthing system at substations shall limit the step and touch system fault current. Milan asks, I am trying to understand how to design a substation earthing system and fault current is something I am not getting. The grounding system in substation is very Continue ReadingSubstation Earthing System ( Grounding System ) – Earthing Mat. Day 2 - Industrial Earthing design 09:00AM to 10:30AM What is the function of earthing, Basic requirement before starting the earthing design, Methodology of earthing design, Objective of earthing design, Fault current calculation results, Material of earthing conductor, Earthing conductor sizing, Current density limitation at electrode,. Earthing systems, impedance grounding. Components of earthing system. We will introduce you to the fundamentals of utility power system grounding. Electrical Bus System and Electrical Substation Layout July 25, 2018 February 24, 2012 by Electrical4U There are many different electrical bus system schemes available but selection of a particular scheme depends upon the system voltage , position of substation in electrical power system, flexibility needed in system and cost to be expensed. Earthing Earthing means that, making a connection to the general mass of the earth. 5 Earthing System Design Considerations Conductors - a substation earthing grid will consist of an earthing system of bonded cross. Aurora ADMS project – provide production support and configuration assistance for deployment of PowerOn Fusion ADMS system Transpower earthing design & EPR assessment - undertake earthing system modelling using CDEGS software to design new substation earth grids and evaluate existing. External companies should not use these standards to construct non-Ergon Energy assets. Bonding of cable screen can be applied. Earthing Mat Design Calculation Sheet - Free download as Excel Spreadsheet (. 1 (page 580-582). Ground potential rise is a concern in the design of electrical substations because the high potential may be a hazard to people or equipment. Free Online Library: The optimal design of earthing system based on genetic algorithm. The behaviours of example earthing systems during a fault are examined. Read about design of substation earthing system here. 5 ohms for High Voltage installations). Build custom earthing systems, using finite-elements determine a safe design Overview Features Videos Screenshots FAQ Testimonials Training Overview Determine earthing system performance, touch and step voltage safety compliance. SATCON ISO 9001-2015 Certified. AC Substation Grounding Requirements Calculator Spreadsheet, The intent of this calculator is to provide information pertinent to safe grounding practices in ac substation design. To set out the minimum standards for the earthing system design of major substations in the company's network. Ground potential rise (GPR) is the maximum voltage that the earthing system may achieve relative to a remote point. Classification of Mv/Lv Substation Transformer. See the complete profile on LinkedIn and discover Jaimin’s connections and jobs at similar companies. Effective Grounding system design is important as it deals with personnel safety and protection of electrical equipment. Protected Data Subject to Disclosure Restrictions See Protected Rights Notice on Cover Page. For a safe and sustainable railway system it is essential to comply with the limits for body and touch voltages as well as stray current criteria according to EN 50122-1,2,3. Earth resistivity measurements. This may allow a global earthing system to be proven, the earthing design to be simplified and electrode installation costs to be reduced. The mesh system shall be designed in accordance with above sub-title "Design calculations" above to limit touch, step and mesh potentials taking into account the combined length of the mesh conductors, other buried conductors and rods but excluding any buried conductors outside the perimeter fence. Successful operation of entire power system depends to a considerable extent on efficient and satisfactory performance of substations. ENWL have asked for some earthing calculations at Norbert Dentressangle Logistics (SJ 79852. This paper presents the design of Earthing system for 400 KV substation and calculation of its parameters. Credit earned on completion of this program will be reported to RCEPP. Design of Safety Critical Substation Earthing System Based on Soil Characteristics. substation will trip to isolate the faulty circuit. 1 of the ESAA Substation Earthing Guide can be used as a guide for the. pdf), Text File (. Earthing and Bonding 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. Generally, provision of effective earthing system depends on aim and goal involved, and the environment where the earthing or grounding as the case may be, is actually required. Course: Power System Grounding (Earthing), Abu Dhabi, UAE, The Power Systems Grounding Seminar provides a practical understanding of system and equipment grounding. ERM has been providing earthing design and design verification services since 2002. Scope of works: Preparation of SLD, Overall layout of the 33KV switchyard indicating sizes of all the premises, cable trenches, clearances etc. Submit samples of conductors and other materials, as requested. application note deals with the design of the ground electrode system while Section 6. Mentoring of engineers-in-training. Go to Content ↑ Earthing and Bonding. structures in earthing systems, and the legacy of High Voltage Earthing Design Services_2pg brochure. - Earthing design and construction verification for a 66kV mobile substation - Detailed earthing design for a new mine site including switching station, 66kV substation and kiosk substations. electronics in collector units and substation areas. Substation Automation Systems: Design and Implementation, First Edition. An important aspect of substation grounding system design is the calculation of the ground resistance offered by the grounding grid, and the values of the mesh and step voltages on the surface. Perform the design of substation earthing so as to ensure safety of personnel and equipment under all conditions; Design appropriate protection against the direct and indirect effects of lightning strikes on substations and the incoming/outgoing overhead lines. · The system earthing and safety earthing are interconnected and therefore fault current flowing through system ground raises the potential of the safety ground and also causes steep potential gradient in and around the Substation. • To conduct the QAQC activity to ensure the compliance of the primary design at site. •Fences should always be independently. An Introduction to Grounding Calculations and Why They Are Necessary grounding programs and show example results for a simple grid design. Jaimin has 6 jobs listed on their profile. Departures from electrical earthing design could result in dramatic differences in performance from that expected. • Overall HV, MV, LV System Design • System Architecture (automation, control and protection system), • Network Calculations (Relay Coordination Studies, Short Circuit Calculations, Load Flow Studies, Voltage Drop and Power Losses Calculation) • Protection and Control relays configurations • Sizing Calculations (CT/VT adequacy check. Actual case studies and in-class exercises. earthing design calculations performing earthing design calculations, using one of the standards above, is an involved and time earthing mat design calculation sheet - free download as excel spreadsheet (. Determination of optimal substation ground grid layout and specifications,. How to Size High Voltage Earthing Conductors Correctly - read our Guest Blog by Ian Griffiths (Earthing System Design HV) at greymatters. In addition to detailed earthing design studies, APD offer other engineering services relevant to the earthing system, including lightning protection design as per AS 1768 and lighting design as per and Australian Standard client requirements. Company for the work which has made it possible to put this revision of the design guide together. Important terminology is discussed including Grid Potential Rise, touch and step voltages and current distribution. is always realized by means of a dedicated MV substation usually designed "Main substation". It is described as system of electrical connection to the general mass of earth. The legacy approach to secondary substation earthing design was based on one or two earth rods and combining HV and LV earths if the measured earth resistance was less than 1 ohm. The key topics of personnel safety and substation earthing system design form a major focus of the course. We have already given an introduction to substation earthing system in an article published earlier. Western Power Distribution is the electricity distribution network operator for the Midlands, South Wales and the South West. Figure 12 - Schematic layout of earthing system. - 33/11kV Substation Design and Calculation including main process equipment in 11kV and also in LV 0. Soil resistivity tests were conducted at project site area and same data was used for doing design calculations. In practice, where electrodes are spaced sufficiently far apart, it is normally sufficient. Because earthing is impacted by soil resistivity, in certain cases, the native soil needs to be replaced to get the desired results. These standards created and made available are for the construction of Ergon Energy infrastructure. Course EE-5: Grounding System Design Calculations 1- Course Description: This course is intended to prepare the target persons with the ability to perform all electrical grounding system design for Domestic, Commercial and Industrial Facilities and AC Substations. The appendices also include supporting and background information on various aspects of substation earthing. 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 infrastructure. Under this category, we are accept assignments for electrical design calculations, cable tray layout drawing of indoor substation, earthing layout drawing and others. 80 in the Analysis of Substation Grounding. 2 SOIL RESISTIVITY TESTING PROCEDURE GUIDELINES The purpose of resistivity testing is to obtain a set of measurements which may be interpreted to yield an equivalent model for the electrical performance of the earth, as seen by the particular earthing system. Perform the design of substation earthing so as to ensure safety of personnel and equipment under all conditions; Design appropriate protection against the direct and indirect effects of lightning strikes on substations and the incoming/outgoing overhead lines. The tool includes fault current distribution calculations for underground cables building on work included in one. The potential relative to a distant point on the Earth is highest at the point where current enters the ground, and declines with distance from the source. Substations transformer may be classified according to metering arrangements (MV or LV) and type of supply (overhead line or underground cable), Substations trans-former are classified into three types:. The legacy approach to secondary substation earthing design was based on one or two earth rods and combining HV and LV earths if the measured earth resistance was less than 1 ohm. Services provided include: On-site soil resistivity testing as inputs to the calculations and modelling. The site is a 400kV substation with two L2 double-circuit overhead lines and four 400/132kV transformers that feed an adjacent 132kV substation. The first step in designing a power substation is to design an earthing and bonding system. PRODUCED BY THE OPERATIONS DIRECTORATE OF ENERGY NETWORKS ASSOCIATION www. Modules of the developed software tool were used to conduct some calculations which are typical for designing of the grounding systems. Substation Equipment and Re-inforcement Earthing. The combined pro-duct requires the space of one conventional termination only and is fixed on the same support. 5 Earthing System Design Considerations Conductors - a substation earthing grid will consist of an earthing system of bonded cross conductors. This standard sets out the objectives and basic configurations required of an earthing layout. The course will give you an understanding of the philosophy and design of network and substation earthing systems. PDF Calculation of earthing - EIHP Energetski institu Hrvoje Požar. New substation - Complete secondary design of control/protection systems and all auxiliary and telecom cubicles and interfaces. txt) or read online for free. In effort to secure the earthing system. Distribution systems are earthed to create a reference point for the system voltage, to facilitate the detection and discriminative isolation of faults involving contact to earth, and to limit over-voltages under transient conditions. The earthing system, sometimes simply called 'earthing', is the total set of measures used to connect an electrically conductive part to earth. earthing design using ETAP, calculate line parameter using ASPEN. Design of the low voltage power system (<1000 V) of the Nordsee One offshore substation. 4 and 33 kV depending on the size of the area served and the practices of the local utility. 31 2049-1 – Substation Standards Control Switchboard Equipment & Communication Rack Anchorage. • Illumination design • Power system protection • Earthing and lighting/surge protection • System studies and calculations • Transformer Certification course in ELECTRICAL DESIGN ENGINEERING from Smart Brains Institute of Engineering Design and Research, Hyderabad, India. Ancillary equipment shall be earthed to the substation main earth by the cable contractor, earth. Samples of Earthing / Grounding Materials. • Design Review of schematic diagrams , method statements , SAT, FAT, and proposed modifications. of grounding system calculation using the methodology of IEEE 80-2000 standard and simulated by means of EDSA[4] software. 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. For example, for a small substation with some transformers, if there is a fault in the system how will the fault current flow into the grounding system?. Statistically, 90-95% of all system short-circuits are ground faults so this is an important topic. (Report) by "Advances in Environmental Biology"; Environmental issues Algorithms Analysis Earth sciences Research Genetic algorithms Usage. They must take account the future expansion of connected power system. Electrical calculations and design MV Switchgear HV Switchyards (HV Components, arrangement and earthing design) Earthing design MV onshore array cable design Wind Turbines (SWP 2,3/3,6, Nordex 2,5) DigSilent Power Factory (Electrical Power Analysis and Calculation Program), power system studies. Lectro-tech manufacture earth mats, and specialise in earthing and grounding, lightning protection and exothermic welding. Statistically, 90-95% of all system short-circuits are ground faults so this is an important topic. BASICS OF EARTH GRID DESIGN. Engage with Stakeholders to determine/finalise the. xlsx), pdf file (. " (Earth Resistance< 0. Wiring diagrams, terminations drawings and multicore schedules for the installation phase. This may allow a global earthing system to be proven, the earthing design to be simplified and electrode installation costs to be reduced. How to Size High Voltage Earthing Conductors Correctly - read our Guest Blog by Ian Griffiths (Earthing System Design HV) at greymatters. Behrouz has also gained good knowledge in substation design, HV cables sizing and installation, transmission system design, earthing system design and applications, and power system protection design and applications. Cannot be understated! The Soil Structure is a foundational requirement for every electrical earthing system design. Satcon is a Kolkata based company which is offering highly reliable Electrical Design & Drawing Consultancy Services. 1 1 1 Substation located in underground station or tunnel environment 1 1 N/A Substation that has an outdoor exposed high voltage busbar 1. ms excel spreadsheet to help you find earthing values for substation. Safety: The No. For area that does not contain equipment, we could increase the mesh size because there is no equipment. electrical design calculations 1. an earthing system. Effective Grounding system design is important as it deals with personnel safety and protection of electrical equipment. GI pipe electrodes as per recommendation of IS 3043-1987 installed in test pits with disconnecting facilities. 0 Code of Practice for Earthing LV Networks and HV Distribution Substations DSS/010/011 1. ( electrical calculations ) the basic concept behind this booklet is to provide the simplest way to find out the electrical calculation. The diameter of main earthmat conductor and risers for extended portion shall be identical to the existing one. 1 pa electrical technical documents. This means there are several distinct earthing systems that are interconnected and cover large areas, often many times larger than typical power plant earth grids. system - these combine to form the lightning protection system. Design - calculations to ensure the design provides adequate safety for personnel during ground fault conditions. Substations thus handle multiple voltages in a given location and link two or more systems of different voltages. Substation Lightning Shielding System Design Calculations. The cable contractor is to provide and terminate the earthing 50 mm x 4 mm copper tape from the link box at the outdoor sealing ends or the splitter box to the switchyard or substation main earth. Under this category, we are accept assignments for electrical design calculations, cable tray layout drawing of indoor substation, earthing layout drawing and others. Focus on lightning protection. electrical design calculations 1. The charger also feeds the DC loads (from AC system via a rectifier). Liberty Consulting Services uses the industry leading software package – CDEGS – Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis, to model soil resistivity field test results and perform earth grid design calculations for high voltage substations, switchyards and power generating. For the 11kV cable network studied, the calculations show that even though 96% of the total fault current returns to the source via the cable sheath, the earth potential rise for a 10 Ohms earthing system can still be as high as 3100 Volts. Design - calculations to ensure the design provides adequate safety for personnel during ground fault conditions. The substation earthing system comprises of a grid (earth mat) formed by a horizontal buried conductors. - Designing the Equipment Earthing for the substation. transformers •Relay coordination •LV systems (LVAC, LVDC, UPS) •Earthing system •VAR compensation We provide static og transient simulations of the elctrical design using PowerFactory - DIgSILENT or Paladin Designbase. the book is general information about the basic of the electrical calculations which is rarely found in the collected manner. voltage earthing system is connected to a zone or transmission substation earthing system. The calculation is made in line with IEEE 80 or IS 3043 standards. • Substation Maintenance Dwgs (MEWP & Crane Access Layouts) • Develop Multiple Design Options to suit client requirements. * Best trainer for AutoCAD, CDEGS. The first step in designing a substation is to design an earthing and bonding system. Successful operation of entire power system depends to a considerable extent on efficient and satisfactory performance of substations. Design of Grounding / Earthing System in a Substation Grid. iEngineering Group is the Authorised Distributor of NEPLAN Power System Analysis Software and is part of the international NEPLAN®-Consulting group. 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. Consultants of Consultancy & Design Engineering of EHV Electrical - Substation Design, Switchyard Design, HV/LV Power Distribution System Design and Detail Engineering & Drawings Services for High Voltage Electrical Projects offered by Satcon, Kolkata, West Bengal. Please try again later. Liberty Consulting Services uses the industry leading software package – CDEGS – Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis, to model soil resistivity field test results and perform earth grid design calculations for high voltage substations, switchyards and power generating. If a satisfactory or safe design can not be achieved using EG-1, EG-0 may be used. Ancillary equipment shall be earthed to the substation main earth by the cable contractor, earth. •Earthing at 33kV and 11kV substations is simple. PRODUCED BY THE OPERATIONS DIRECTORATE OF ENERGY NETWORKS ASSOCIATION www. Read about design of substation earthing system here. Using the results of this calculation, you can: Determine the minimum size of the earthing conductors required for the main earth grid; Ensure that the earthing design is appropriate to prevent dangerous step and touch potentials (if this is necessary). Statistically, 90-95% of all system short-circuits are ground faults so this is an important topic. Further to this, I have produced several lightning protection system designs to BS 62305. EE35T - Substation Design and Layout The First Step in designing a Substation is to design an Earthing and Bonding System. The combined pro-duct requires the space of one conventional termination only and is fixed on the same support. If you mean, methods, tools, etc (it would be helpful to know what, specifically you are trying to calculate), you take into account things like soil composition, water table, average precipitation, etc. · The system earthing and safety earthing are interconnected and therefore fault current flowing through system ground raises the potential of the safety ground and also causes steep potential gradient in and around the Substation. Design of Safety Critical Substation Earthing System Based on Soil Characteristics. design criteria, data and calculations for use in substation earthing design at all voltages. Earthing System Condition Assessment Project Brief. 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. DESIGN Geological surveys, calculations, design and commissioning deep and shallow grounding. One of the key parameters in substation earthing design is to calculate accurately the grounding resistance of the system. Standard for Distribution Line Design Underground. In effort to secure the earthing system. Further to this, I have produced several lightning protection system designs to BS 62305. pdf), Text File (. IEEE 80-2000. Final earthing design calculations for approval, clearly indicating expected maximum earth fault levels and suitable conductor sizes, before implementation. Standard equations are used in the design of earthing system to get desired parameters such as touch and step voltage criteria for safety, earth resistance, grid. Before 1960s the design criterion of substation earthing system was “low earth resistance. This indicates that careful consideration should be given to the design of all earthing systems. txt) or read online for free. 66/11 kV DISTRIBUTION SUBSTATION DESIGN Mr.