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December 20 2019


How Are We Able To Minimize Ground Resistance?

Sometimes adding more ground rods and pipes will not likely do achieve something to bring the floor resistance down in high resistivity areas. Especially sometimes, adding more ground rods will not likely a single thing to take the resistance down (the resistance stays the identical).
A great understanding of soil resistivity and related tests are essential. Some guidelines must be established to the soil testing. Similarly the testing and spacing to discover the soil resistivity with depth is vital particularly when deep grounding/earthing elements will probably be used.
A better than acceptable ground resistance would impact the safe operation of power system. Several various methods had been utilized for 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, improving the burial depth in 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 methods are suitable for different geographical situations however that does not always mean they'll work with out a correct soil resistivity testing or proper evaluation and without collection of acceptable data to warrant their application. In fact, within a specific soil environment, two or more methods can be viewed to decrease the grounding resistance effectively.
The method to incorporate deep vertical grounding electrodes for the grounding grid is incredibly great at substations with small area. Using this method can utilize low-resistivity soil layer and remove the high resistivity soil close to the surface affected by freezing and low temperature. In order to decrease the grounding resistance, the explosive grounding technique was proposed to reduce the grounding resistance of grounding grids in high resistivity area. The evaluation of the explosive grounding technique as with any grounding strategy is also suffering from cost.
One efficient approach to decrease the earthing resistance of substation is to apply deep ground wells electrodes. Various kinds of deep ground wells exist: As an example you are able to drill 150 mm ground well and go 50 meters to 85 meters deep or more in the ground and soon you reach moist soil ground water or limestone... The bottom well is filled with bentonite material and non-corrosive material to boost resistivity.
To do this sort of grounding you need and also to rely on enhanced or more advanced grounding program in order to calculate correctly the grounding resistance since programs such as ETAP or SKM will not have the specified capacity to do these calculations for the reason that grounding resistance of the equivalent model cannot be easily calculated. The grounding resistance of your deep ground well may be calculated by numerical analysis application according soil model. The SES program can be utilized.
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