Introducing Cables in MALZ

Cables can now be used in MultiGroundZ (MALZ). They can be specified in the same way as in MultiFields (HIFREQ). This development rests on fully accounting for inductive effects between the components of each cable and at the same time neglecting them between different cables and between all other conductors. For models that meet this assumption, the results are identical between MALZ and HIFREQ.

The image below illustrates this for a case of two grids each in a different two-layer horizontal soil, joined by a three-component cable, of which only the core is connected to each grid at each end.

The leakage current shown is nearly identical in MALZ and HIFREQ. The cable components are displayed by specifying an incremental vertical shift from the core held at its original location.

Leakage current in HIFREQ and MALZ for two grids in a Multi-Region soil connected by a cable.

However, this new feature should be considered as an approximation when inductive effects are significant between different cables and conductors. It can be used to quantify the relative importance of inductive and conductive effects.

Cables may be used to connect different grids in windfarms and solar farms, as these are often large systems that would benefit from the MALZ run-time advantage over HIFREQ.

See the article titled “Introducing Cables in MultiGroundZ” for further details.

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