Humphries Perkins posted an update 7 months, 2 weeks ago
Sometimes adding more ground rods and pipes will not likely do achieve anything to bring the bottom 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 precisely the same).
A fantastic idea of soil resistivity and related exams are very important. Some guidelines must be established for that soil testing. Similarly the testing and spacing to discover the soil resistivity with depth is essential in particular when deep grounding/earthing elements shall be used.
A greater than acceptable ground resistance would affect the safe operation of power system. Several various methods had been applied in earlier times to lower the grounding resistance with the grounding system. Methods include enlarging the grounding/earthing grid, connecting the key grounding grid having an external grounding grid, helping the burial depth in the grounding grid, utilizing natural grounding object for example steel foundations of structures, adding long vertical grounding electrodes or pipes, and changing the soils across the grounding grid with low resistivity materials and chemicals.
These methods are compatible with different geographical situations but that doesn’t imply they will work without having a correct soil resistivity testing or proper evaluation and without variety of acceptable data to justify their application. In reality, within a specific soil environment, 2 or more methods can be considered to decrease the grounding resistance effectively.
The process to add deep vertical grounding electrodes to the grounding grid is extremely good at substations with small area. This technique can utilize the low-resistivity soil layer and eliminate the high resistivity soil close to the surface affected by freezing and occasional temperature. To be able to limit the grounding resistance, the explosive grounding technique was proposed to lower the grounding resistance of grounding grids in high resistivity area. The look at the explosive grounding technique as with any grounding technique is also affected by cost.
One efficient way to slow up the earthing resistance of substation is to apply deep ground wells electrodes. Various kinds deep ground wells exist: For example you can drill 150 mm ground well and go 50 meters to 85 meters deep or even more on your lawn unless you reach moist soil ground water or limestone… The ground well is loaded with bentonite material and non-corrosive material to improve resistivity.
To get your house this type of grounding you’ll need and then to depend on enhanced or higher advanced grounding put in order to calculate correctly the grounding resistance since programs for example ETAP or SKM would not have the required power to do these calculations for the reason that grounding resistance with the equivalent model is not easily calculated. The grounding resistance of an deep ground well could be calculated by numerical analysis software program according soil model. The SES software program can be utilized.
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