Manual Cymgrd

Power Engineering Software and Solutions

Transmission, Distribution and Industrial Power Systems Analysis

CYMGRD - Substation Grounding Program
CYMGRD is a substation grounding grid design andanalysis module 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 evaluationfacilities . The program conforms to IEEE 80™ 2000, IEEE 81™ 1983 and IEEE
837™ 2002.

Program Features
The use of CYMGRD allows for the rapid analysis of various
design alternatives to choose aneconomical solution for any
particular installation. User-friendly data entry, efficient analysis
algorithms and powerful graphical facilities render CYMGRD an
efficient tool that helps the engineerarrive at technically sound
and economical designs.
Analytical Capabilities

• Finite element analysis of the ground grid conductors, rods
and wire assembly.
• Computation of Rg and GPR (GroundPotential Rise).

• 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.
• Supportssymmetrical 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 allowable single phase to ground
fault current for a specified grid.

• Touch and surface potential analysis, inside and outside
the grid perimeter, with color display in 2D or 3Drepresentation.
• 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 commontypes 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....