GSA is a computation code for substation grounding grid design and analysis of low frequency grounding systems developed by SINT Informatica Srl. GSA considers both European standard CENELEC (European countries: EN 61936-1:2010 and EN 50522:2010) and American standard IEEE Std 80™-2000.

GSA is able to analyse the low frequency performance of earthing systems composed of more distinct electrodes of any shape, with a high level of details. It can take input data in the form of either graphical (from AutoCAD ® “dxf” files) or numerical and render powerful graphical facilities via it’s optimised and validated computation algorithms, thus making GSA an indispensable tool for grounding system design and verification.

GSA includes a module to calculate uniform or double layer soil equivalent models starting from measured soil resistivity data.


  • Electrical data (e.g. single phase to earth fault current, data for calculation of earthing current, reference standard, intervention time of protections, eventually additional resistance between feet and ground surface, etc.)
  • Geometrical data (e.g. grounding system layout of all electrodes (up to 99), conductors section, coating thickness, material properties etc.). Each electrode consists in a network of arbitrarily connected (or separated) conductors

Physical data (e.g. soil resistivity or apparent resistivity measured values, superficial thin layer characteristics, etc.)


  • Decrement factor (Df) as per IEEE standard
  • Split factor (r) as per EN standard or (Sf) as per IEEE standard
  • Earthing current
  • Minimum cross section of grounding system conductors for thermal specification
  • Double layer model soil parameters from on site measurements values of apparent resistivity
  • Reduction factor of touch and step voltages due to a superficial thin layer (Cs) as per IEEE standard
  • Maximum permissible touch and step voltages as per EN and IEEE standards. With European standard it is also possible to calculate the permissible touch voltage without presence of human body, taking into account the body resistance (Rb 50%) and possibly additional resistance between feet and ground surface
  • Ground resistance and Ground Potential Rise values of all electrodes
  • Distribution of leakage current from the electrodes with 1D, 2D and 3D graphical representation to verify the contribution and the efficiency of grounding system portions
  • Maximum electric field value close to the electrodes (useful to quickly check if the soil ionization phenomenon can occur)
  • Soil surface potentials and touch and step voltages distributions on superficial straight line or rectangular area by 2D and 3D coloured graphic representations, for individuation of safe and hazardous areas
  • List of material used for grounding system (wires and rods)
  • Orthographic projections or isometric representations of grounding system


  • Calculation model based on “PEEC” method
  • Analysis of grounding systems of any shape, with choice of the total number of elementary sources
    Possibility to analyse up to 99 distinct electrodes on the same calculation, including for instance return electrodes, transmission line grounding systems or floating potential underground electrodes
  • Characterization of soil with a uniform or double layer model. Beyond this a superficial thin layer can be added
  • Possibility to analyse electrodes partially insulated or encased in concrete or buried in treated soil to lower resistivity
  • Libraries with typical properties of soil, soils covering, concrete and backfill materials
  • Possibility to export graphic outputs to other WINDOWS ® applications
  • Possibility to choose the language


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