What is the preferable value of earth ressistance to be used in matlab simulations ?

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Narasim Ramesh

Suggest you can model it as an infinite hemisphere with earth resistivity.

ref :https://en.wikipedia.org/wiki/Soil_resistivity

"The soil resistivity value is subject to great variation, due to moisture, temperature and chemical content. Typical values are:

Usual values: from 10 up to 1000 (Ω-m)"

Cheers

Krishnarayalu Movva

You can use the ground block available in SIMULINK. In general earth resistance is of order of 1 ohm.