CYMGRD

Substation Grounding

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.

  • Ground Analysis
  • Electrode and Conductor Sizing
  • Grounding System Analysis

Software Specifications

  • Finite element analysis of the ground grid conductors and rods
  • Computation of the station ground resistance (Rg) and the Ground Potential Rise (GPR)
  • Step voltage analysis
  • Safety assessment calculations for maximum permissible touch and step voltages as per IEEE 80™ 2000
  • DC component of asymmetrical fault current taken into account in the computations
  • 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
  • Electrode analysis for the optimal sizing of conductors and rods based on the most common type of electrode material as per IEEE 80™ 2000 and IEEE 837™ 2002
  • Supports symmetrical or asymmetrical grids of any shape
  • Ability to model return electrodes and distinct electrodes
  • Ability to model concrete encased rods
  • Computation of maximum allowable single phase to ground fault current for a specified grid
  • Graphics of touch and step voltage variation along any straight line, with comparison to the safe values computed by the safety assessment module
  • Touch and surface potential analysis, inside and outside the grid perimeter, with color display in 2D or 3D representation
  • The CYMGRD / AutoCAD® Interface module The CYMGRD / AutoCAD® Interface module allows the user to alternate between the AutoCAD® and the CYMGRD environments.

Ground Analysis

By comparing the measured and calculated soil resistivity, the accuracy of the soil model can be checked. CYMGRD also offers the option of defining the soil as two layers. In this way, the model is closer to a reality by defining a soil model for a certain depth and then a different soil model. In addition, the maximum permissible steps and touch voltages are calculated according to the following standards and optimum analysis is provided.

  • IEEE-80-2013
  • IEC Std.60479
  • BS 7354 (1990)
  • EA-TS 41-24 (1992)
  • CENELEC HD 637 S1 (1999).

The results obtained from the soil analysis module can be automatically transmitted to other modules and other analyzes can be continued easily.

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Electrode and Conductor Sizing

CYMGRD determines the minimum conductor and / or electrode size that can be used according to IEEE-80-2013 standards. In order to determine the electrode size, it takes into account many parameters from the material of the electrode to the ambient temperature.

CYMGRD has the most commonly used conductive and electrode types in earthing projects. It calculates the size and equivalent impedance of the respective material if any of these standard materials is preferred. A number of parameters of these materials can be customized by the user.

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Grounding System Analysis

It calculates the currents emitted by all conductors and electrodes in the grounding system and the potential differences in the soil surface are determined. The module also takes into account the effect of other grounding systems near the earthing network when calculating surface voltages and / or the effect of conductive materials, such as foundation bars and metal water pipes. These materials can be included in the analysis or neglected at any time in order to observe the difference.

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Graphics Module

All potential differences from the graphical module results can be visualized in two or three dimensions. The touch, step and surface potential can be visualized for two or three dimensions in all points of the grounding system. Also any linear line that can be drawn on the system and all potential differences on this line can be displayed simultaneously with the permissible limit values (in particular frequently used to determine step voltages). In this way, danger areas can be easily identified. The resulting graphics can be output or copied.

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