![]() From the equation giving the voltage at a distance r away from the electrode or the grid: ![]() As i'm trying to understand this better, the fault level of this substation at the LV side is around 25kA. What about a 1 MVA kiosk substation? Historically, i think all that is required was two deep driven electrodes, one at the HV and one at the LV sides. I understand that IEEE 80 and the rest of the stuff is more towards "zone substations"/"outdoor switch yards" with sizeable area. Shouldn't there be a procedure to go on site and use a "Shepperd" stick (vertical rod with battery and two electrodes) and take measurements across several points on the site? And if that is done, what do I do with all this "valuable" earth resistance site survey if a software as powerful as ETAPS does not need it?ģ. I was surprised when he showed me the screen for the soil resistivity: you specify only the cover, upper layer (and its depth) and lower layer. A friend of mine at work uses a decent software in his department (ETA Power Station). Is there any Free software that can help me with this?Ģ. ![]() I'm a bit new at substations grounding and I have given myself an exercise to do it for a 1 MVA 11/0.4kV kiosk substation but I need assistance please:ġ.
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