Substation Grounding Grid - CYMGRD

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The CYMGRD software is a substation grounding grid design and analysis program specially develope 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.

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Features

The use of CYMGRD 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™ 80-2000 and IEEE™ 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

CYMGRD / AutoCAD® Interface module

The CYMGRD # AutoCAD® interface module allows the user to alternate between the AutoCAD® and CYMGRD environments.

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

Simulations 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.