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MALT

Grounding Analysis

The MALT engineering module is used to analyze power system grounding networks having arbitrary shapes and is often used to investigate potentials and currents diverted  (transferred) to nearby buried metallic structures. MALT is one of  the main components of the AutoGround, MultiGround, AutoGridPro and AutoGroundDesign software packages.

 

Technical Highlights

MALT has important features which are unmatched by other comparable programs. For example, you can:
  • Apply equivalent soil models with one, two or more horizontal or vertical layers. You can also model soil structures with complex geometries, such as spherically or cylindrically layered soils, soils with an inclined layer or in the shape of a spheroid, and soils with finite volumes of different resistivities - model substation backfill sites, dams, rivers or lakes, for example.

Using MALT, you can model vertical and horizontal multilayer soils, cylindrical, spherical, spheroidal, inclined as well as arbitrary finite volumes of heterogeneous soil

  • Specify any number of electrodes whether energized or not.
  • Locate conductors and/or metallic plates arbitrarily in the soil, i.e., you are not restricted to x, y, or z directed conductors.
  • Energize each electrode individually with your choice of current and/or voltage sources.
  • Interpret ground impedance measurements in non uniform soils obtained using the fall-of-potential method or other techniques.
  • Study electrostatic problems involving conductors and/or plates (energized or not) above a perfect ground plane, optionally in the presence of an external electric field.

Technical Features

  • Grounding systems are modeled as a network of lossless cylindrical conductors and/or metallic plates freely directed in space.
  • Horizontally-layered soils and vertically-layered soils can have any number of different layers, with arbitrary resistivity contrasts.
  • The grounding network can be placed at arbitrary locations with respect to the vertical layers.
  • Spherical layers, spheroidal layers, inclined layers, cylindrical layers and arbitrary, prismatic volumes of soil with any values of soil resistivities can be embedded in the native soil.
  • MALT computes the ground potential rise of every independent system of the grounding network, the earth leakage current distribution along every conductor segment and/or plate patch, and the potentials, electric field and current density at each specified point in the soil or at the earth surface.
  • The grounding systems can be any arbitrary group of metallic structures.  Each structure can be energized or not and can have potential rises that are different from each other.

 

Using MALT, you can model arbitrary groups of metallic structures

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