Svendsen Blake posted an update 1 year, 4 months ago
Sometimes adding more ground rods and pipes will not likely do achieve something to bring the ground resistance down in high resistivity areas. Especially sometimes, adding more ground rods will not likely a single thing to get the resistance down (the resistance stays exactly the same).
An excellent idea of soil resistivity and related exams are essential. Some guidelines should be established for that soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is very important particularly when deep grounding/earthing elements are going to be used.
A greater than acceptable ground resistance would modify the safe operation of power system. Several various methods ended up utilized for earlier times to diminish the grounding resistance of the grounding system. Methods include enlarging the grounding/earthing grid, connecting the main grounding grid by having an external grounding grid, increasing the burial depth from the grounding grid, utilizing natural grounding object like steel foundations of structures, adding long vertical grounding electrodes or pipes, and changing the soils round the grounding grid with low resistivity materials and chemicals.
These techniques are suitable for different geographical situations however that doesn’t imply they’re going to work without a correct soil resistivity testing or proper evaluation and without collection of acceptable data to warrant their application. Actually, in the specific soil environment, a couple of methods may very well be to decrease the grounding resistance effectively.
The technique to incorporate deep vertical grounding electrodes to the grounding grid is quite great at substations with small area. This method can use the low-resistivity soil layer and eliminate the high resistivity soil at the surface afflicted with freezing and occasional temperature. In order to decrease the grounding resistance, the explosive grounding technique was proposed to diminish the grounding resistance of grounding grids in high resistivity area. The look at the explosive grounding technique as with any grounding strategy is also affected by cost.
One efficient method to limit the earthing resistance of substation is with deep ground wells electrodes. Several types of deep ground wells exist: For instance it is possible to drill 150 mm ground well and go 50 meters to 85 meters deep or more on your lawn unless you reach moist soil ground water or limestone… The floor well is full of bentonite material and non-corrosive material to further improve resistivity.
To get your house such a grounding you need and to count on enhanced or even more advanced grounding program in to calculate correctly the grounding resistance since programs like ETAP or SKM will not have the required power to do these calculations because the grounding resistance with the equivalent model can not be easily calculated. The grounding resistance of your deep ground well may be calculated by numerical analysis software package according soil model. The SES software package can be utilized.
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