Grounding System Calculations with CYMEGRD, DEHN, CDEGS 17, DEHN, DIGSILENT2024 and CYMCAP Sales

This company performs all grounding system calculations using software such as CymeGRD, ETAP, CYMCAP, CDEGS 17, PLSCADD V16.81, DIGSILENT2024, or DEHN. For purchasing DEHN, CDEGS, CYMGRD, CYMCAP, PLSCADD, or DIGSILENT2024 software, please contact 09126717215.

The term CDEGS, which stands for Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis, is a powerful integrated software suite designed by sestech for precise analysis of various electromagnetic issues occurring in all industries including electrical networks. CDEGS software offers various advanced solvers for solving these problems: – Direct solutions of Maxwell's equations – Circuit-based analyses – Finite element methods – Inversion algorithms – Fourier analysis (FFT) – Transient analysis – Hybrid methods

This software also supports all modes of electromagnetic coupling: – Conduction, through metallic elements, coatings, and the earth itself – Magnetic induction – Capacitive effects

CDEGS software includes the following cores: RESAP: Soil Resistivity Analysis MALT: Low Frequency Grounding/Earthing Analysis TRALIN: Detailed Fault Current Distribution and EMI Analysis HIFREQ: Electromagnetic Fields Analysis FCDIST: Simplified Fault Current Distribution Analysis MALZ: Frequency Domain Grounding/Earthing Analysis SPLITS: Detailed Fault Current Distribution and EMI Analysis FFTSES: Automated Fast Fourier Transform Analysis

The auxiliary tools included in this package are: Autotransient, CETU, FFT21Data, GraRep, GRServer, GRSplits, GRSplits-3D, ROWCAD, SESAmpacity, SESBat, SESCAD, SESConductorDatabase, SESConverter, SESCrossSection, SESCurveFit, SESeBundle, SESEnviroPlot SESFcdist, SESFFT, SESGSE, SESImpedance, SESLibrary, SESPlot, SESPlotViewer, SESResap, SESResultViewer, SESScript, SESShield, SESSystemViewer, SESThreshold, SESTralin, SICLCommand, SoilModelEditor,

Given the vastness of the grounding system topic, terms such as Clean Earth, Dirty Earth, Floating Earth, Single Point Ground (SPG), Multi-Point Ground (MPG), TBB, TMGB, TGB, Star Bonding (STAR), Mesh Bonding (MESH), MBN, IBN, GPR, SRG ... are frequently repeated in engineering documents. Various software like ETAP, SGW, SDWorkstation, CDEGS, etc., are offered by different companies for grounding system design. Most grounding system design engineers are familiar with ETAP and CYMGRD software. Some issues with these software include:

• Considering the entire grounding network as equipotential
• Ignoring the reactive part of grounding system conductors

Among these, only SES (Safe Engineering Services & technologies ltd) software professionally addresses grounding system design. Some unique capabilities of this software compared to others include:

• Grounding system design at high frequencies
• Optimal grounding system design for substations and power plants compared to other software
• Grounding system design in soil with any number of layers (horizontal, vertical, spherical, cylindrical, with defined volume, etc.), used for special centers like dams
• Fault current distribution analysis in the grounding network
• Lightning strike state studies on transmission lines, telecom towers, wind turbines, nuclear power plants, etc.
• Analysis of transmission and distribution line parameters, power cables, EMI and EMC
• Optimal 3D lightning protection system design (line, substation, etc.) according to IEEE and IEC standards
• Analysis of electromagnetic issues caused by transmission lines on adjacent facilities such as railways, oil and gas pipelines, etc.
• Assessment of electromagnetic effects on the environment (corona, acoustic noise, radio noise)

The SES software suite from Canada includes several software packages, with the CDEGS package (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis) being the most prominent.

The CDEGS software package consists of 8 modules: RESAP, MALT, MALZ, TRALIN, SPLITS, HIFREQ, FCDIST, FFTSES, or in other words, 12 software packages: AutoGround, MultiGround, MultiGround , MultiGroundZ, MultiGroundZ , MultiFields, MultiFields , MultiFieldsPro, MultilLines, AutoGridPro, AutoGroundDesign, Right-Of-Way.

Each software package is composed of several modules as per the table below:

CYMGRD is a software for designing and analyzing grounding systems, created to assist engineers in optimizing new network designs and reinforcing existing networks of any shape. Advanced features in a graphical environment combined with efficient analysis algorithms make this software a powerful tool to help engineers develop technical and economical designs.

This software enables the design of grounding for substations, power plants, factories, and buildings. The design can be for uniform and two-layer horizontal soils, calculating touch and step voltages according to IEEE standards.

For grounding calculations of solar power plants, considering that panel structures are part of the grounding system, calculations differ somewhat from typical substation grounding.

The software receives fault current magnitude and duration, soil resistivity, and body weight from the user and performs the following using soil, network, and diagram modules: 1- Soil Module Measures soil resistivity based on one or two-layer models. This module can plot measured and calculated resistivities and compute maximum virtual touch and step voltages according to standards. 2- Network Module Calculates current injected by each conductor element into the soil and determines soil surface potential using these currents. The grounding network can be defined as single conductor or a set of conductors connected in a square. Substation layouts can be drawn in 2D or 3D. Underground pipes and adjacent grounding networks can be considered to assess their impact on fault current and surface voltage. 3- Diagram Module Summarizes soil resistivity and surface potential analysis results on screen, using 2D and 3D color plots for better presentation.

Key features of CYMGRD software:

• Grounding system design for low frequencies (especially substation grounding design per IEEE 80-2000)
• Support for IEEE 80 2000, IEEE 81 1983, and IEEE 837 2002 standards
• Finite element analysis of grounding conductors and rods
• Calculation of station ground resistance (Rg) and Ground Potential Rise (GPR)
• Touch and surface potential analysis inside and outside the grid with color display
• Step voltage analysis
• Support for symmetrical or asymmetrical networks of any shape
• Modeling of return and distinct electrodes
• Calculation of maximum single-phase to ground fault current for a specified network
• And more...

CYMGRD Screenshot 1 CYMGRD Screenshot 2

CYMGRD 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. User-friendly data entry, efficient analysis algorithms and powerful graphical facilities make the CYMGRD software an efficient tool that helps the engineer arrive at technically sound and economical designs.

Program Features The use of the CYMGRD software allows for the rapid analysis of various design alternatives to choose an economical solution for any particular installation. The program conforms to IEEE 80™ 2000, IEEE 81™ 1983 and IEEE 837™ 2002.

Analytical Capabilities

• Finite element analysis of the ground grid conductors and rods
• Computation of the station ground resistance (Rg) and the Ground Potential Rise (GPR)
• Touch and surface potential analysis, inside and outside the grid perimeter, with color display in 2D or 3D representation
• Step voltage analysis
• Uniform or two-layer soil model from field measurements or user-defined values
• Computation of reduction factor (Cs)
• Library of the most common types of surface layer materials
• Library of typical station soil resistivity values
• Safety assessment calculations for maximum permissible touch and step voltages as per IEEE 80™ 2000
• Current Split Factor (SF) estimated from substation configuration data as per IEEE 80™ 2000
• Computation of the Decrement Factor (DF) from bus (X/R) ratio and shock duration data as per IEEE 80™ 2000
• DC component of asymmetrical fault current taken into account in the computations
• Electrode analysis for the optimal sizing of conductors and rods based on the most common type of electrode material as per IEEE Std. 80-2000 and Std. 837-2002
• Supports symmetrical or asymmetrical grids of any shape
• Arbitrarily located ground rods
• Ability to model return electrodes and distinct electrodes
• Ability to model concrete encased rods
• Computation of maximum single phase to ground fault current for a specified grid

The CYMGRD/AutoCAD® Interface module The CYMGRD / AutoCAD® Interface module allows the user to alternate between the AutoCAD® and the CYMGRD environments. This utility is not a substitute for AutoCAD®. In fact, AutoCAD® remains a firm software requirement for CADGRD, because it is AutoCAD® that will produce the necessary *.DXF or *.DWG file(s) that contain the pictorial description of the substation grid layout realized with the CYMGRD software.

Simulation Results Management The charts functionality allows:

• Graphical comparison of deduced soil model with field measurements, for model acceptance
• Color-coding of the surface potential gradients based on user-defined thresholds for touch or surface potentials. Any area of the grid can be selected with the mouse for detailed calculations and danger point evaluation
• Equipotential contours for surface potentials in either 2-D or 3-D plots, with facilities to examine the graphs from any desired viewing angle
• Graphics of touch and step voltage variation along any straight line, with comparison to the safe values computed by the safety assessment module
• Graphic indications on the 2-D grid layout of the area being analyzed for touch and step voltages, for easy identification of hazardous locations

More info (open/close)

Explanation of grounding design with DEHN: DEHNsupport Toolbox software is a planning tool for lightning protection systems offering various calculation options, from risk management to calculating air terminal rod lengths, separation distances, and grounding electrode lengths. DEHNsupport, a product of DEHNsupport company, provides easy and practical electronic planning and decision support for planners, lightning protection installers, and electricians. This significantly facilitates professional implementation of comprehensive lightning protection systems.

DEHNsupport Toolbox has been expanded with another module and now also supports comprehensive internal lightning and electrical protection planning. The new DEHNselect SPD software module allows defining and selecting all internal lightning and electrical protection products. It provides a structured plan with a bill of materials and quick online access to all selected product documents such as data sheets and installation instructions.

DEHN support toolbox consists of the following modules:

DEHN Risk Tool (Risk Management) Module DEHN Distance Tool Module (Separation Distance Calculation) DEHN Air-Termination Tool (Air Terminal Rod Length Calculation) DEHN Grounding Tool (Ground Electrode Length Calculation) DEHNselect SPD Tool Module (Surge Protective Device Selection and Dimensioning Guide)

1- Register the design in the system and receive a dedicated user panel 2- Calculate short circuit in TN and TT networks considering distribution factors, X/R ratio, and other recommendations in IEEE80 standard 3- Interpret soil resistivity in multilayer soils and determine apparent resistivity and effective depth 4- Grounding system calculations including resistance, GPR graph, step voltage, touch voltage, protective device trip time, and selection of trip curve and protective device 5- Select electrode and grounding conductor materials 6- Prepare official report in PDF format

Tested download link for CYMGRD V.6.3.R7 software:https://s25.picofile.com/file/8455555850/CYMGRD_V_6_3_R7.rar.html Password: cyme

Installation method: First, disable antivirus, then run the grd637 file. After installation, place the pk42mvdR.dll file in the software installation folder (usually not in the C drive). Then click on CYMGRD inside the installation folder to run the software. If no error message appears, the software is installed correctly. If an error about missing SC32W file appears, copy the contents of the REQUIRED FILE folder to the installation folder. This will resolve the issue.

The following modules enable realistic and practical cable studies:

Power Cable Ampacity Duct Bank Optimizer Module Multiple Duct Bank Module Short Circuit Rating Real Time Temperature Rating CYMCAP/MDB, Multiple Duct Banks module

CYMCAP Software: CYMCAP software is used for precise calculation of the capacity and heat rating of power cables. Its accuracy increases confidence during cable upgrades and new cable designs. It also enhances system reliability and supports proper use of installed equipment. CYMCAP performs thermal capacity and temperature rise calculations for power cable installations. Determining the maximum current that power cables can carry without damaging their electrical properties is crucial for electrical facility design. This software was jointly developed by Ontario Hydro (Hydro One), McMaster University, and CYME International under the Canadian Electricity Association.

Selecting the appropriate cable size is one of the most important engineering tasks, often done manually. If the chosen size is smaller than required, cable damage or system malfunction may occur; if larger, despite proper function, economic design considerations are neglected. In most projects, designers calculate cable size based on voltage drop and short circuit criteria, often ignoring thermal sizing. For thermal sizing, especially for MV and HV cables, cable construction and layer specifications must be accurately modeled, and allowable current calculated based on installation environments such as underground, air, tunnels, ducts, trenches, etc.

In this course, using the professional cable sizing software CYMCAP, we introduce various cable aspects, steady-state sizing, transient sizing considering current profiles, temperature field estimation around cables, magnetic flux density calculation around cables, induced voltage on shields, optimizing cable arrangement in duct banks, cable impedance matrix calculation, etc., based on IEC60853, IEC 60287, and Neher-McGrath methods.

For purchasing CYMCAP software, call 09126717215.