McCallum posted an update 1 year, 10 months ago
Sometimes adding more ground rods and pipes will not do achieve almost anything to bring the soil resistance down in high resistivity areas. Especially sometimes, adding more ground rods will not likely do anything to bring the resistance down (the resistance stays exactly the same).
A fantastic understanding of soil resistivity and related testing is essential. Some guidelines must be established for that soil testing. Similarly the testing and spacing to discover the soil resistivity with depth is essential especially if deep grounding/earthing elements are going to be used.
A better than acceptable ground resistance would get a new safe operation of power system. Several various methods had been used in earlier times to diminish the grounding resistance from the grounding system. Methods include enlarging the grounding/earthing grid, connecting the key grounding grid with the external grounding grid, helping the burial depth of the grounding grid, utilizing natural grounding object including steel foundations of structures, adding long vertical grounding electrodes or pipes, and changing the soils throughout the grounding grid with low resistivity materials and chemicals.
These procedures are compatible with different geographical situations however that doesn’t imply they’re going to work without having a correct soil resistivity testing or proper evaluation and without collection of acceptable data to warrant their application. The truth is, inside a specific soil environment, a couple of methods can be viewed to lower the grounding resistance effectively.
The process to add deep vertical grounding electrodes towards the grounding grid is incredibly good at substations with small area. This technique can utilize the low-resistivity soil layer and get rid of the high resistivity soil at the surface suffering from freezing and low temperature. As a way to reduce 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 suffering from cost.
One efficient way to slow up the earthing resistance of substation is by using deep ground wells electrodes. Various kinds deep ground wells exist: For instance you are able to drill 150 mm ground well and go 50 meters to 85 meters deep or higher in the earth until you reach moist soil ground water or limestone… The ground well is filled with bentonite material and non-corrosive material to improve resistivity.
To get your house this type of grounding you’ll need also to rely on enhanced or even more advanced grounding put in order to calculate correctly the grounding resistance since programs including ETAP or SKM would not have the specified capacity to do these calculations for the reason that grounding resistance from the equivalent model can not be easily calculated. The grounding resistance of a deep ground well might be calculated by numerical analysis program according soil model. The SES application can be utilized.
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