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From the equation giving the voltage at a distance r away from the electrode or the grid: Vr = Icc * rho / (2 * pi * r) if the short circuit current Icc alone is 25kA, the Vr will be in the order of 3-4 kV, which is way above the acceptable level of a step voltage (should be not more than 100V if the protection trips in 0.1s to my understanding, maybe IEEE 80 allows a bit more). As i'm trying to understand this better, the fault level of this substation at the LV side is around 25kA. Historically, i think all that is required was two deep driven electrodes, one at the HV and one at the LV sides. 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? I understand that IEEE 80 and the rest of the stuff is more towards 'zone substations'/'outdoor switch yards' with sizeable area. 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. Is there any Free software that can help me with this?ДЄ friend of mine at work uses a decent software in his department (ETA Power Station). Hi, 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: 1. To download or ftp the software updates / patches you. Coupled with toll-free support from the world's leading R&D design. If the overhead line includes an earthwire ( OHEW ) connected to earth electrode(s) at each pole, then detailed information on the overhead line, earth wire, span, earth electrode details, earth resistivity would be required to determine the current split. FREE DOWNLOAD Calculate% Voltage Regulation of Small.

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Design of Earthing Mat for Sub-Station: FREE DOWNLOAD. Thread: DOWNLOAD: Nero 6.6.0.13 NeroVision Express v3.1.0.7. The CYMGRD software is a substation grounding grid design and analysis program specially developed to help engineers optimize.

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