The way Could We Decrease 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 is not going to do anything to get the resistance down (the resistance stays the same).
A fantastic knowledge of soil resistivity and related tests are very important. Some guidelines must be established for that soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is essential in particular when deep grounding/earthing elements shall be used.
An increased than acceptable ground resistance would affect the safe operation of power system. Several various methods have been used in yesteryear to decrease the grounding resistance with the grounding system. Methods include enlarging the grounding/earthing grid, connecting the primary grounding grid with the external grounding grid, helping the burial depth with the grounding grid, utilizing natural grounding object like 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. 
They are compatible with different geographical situations however that does not necessarily mean they're going to work with no correct soil resistivity testing or proper evaluation and without variety of acceptable data to justify their application. In reality, in the specific soil environment, a couple of methods can be viewed to lower the grounding resistance effectively.
The method to provide deep vertical grounding electrodes on the grounding grid is very effective in substations with small area. This technique can use the low-resistivity soil layer and eliminate the high resistivity soil near the surface impacted by freezing and occasional temperature. So that you can slow up the grounding resistance, the explosive grounding technique was proposed to diminish the grounding resistance of grounding grids in high resistivity area. The evaluation of the explosive grounding technique as with any grounding technique is also impacted by cost.
One efficient way to slow up the earthing resistance of substation is to use deep ground wells electrodes. Various kinds 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 even more in your yard unless you reach moist soil ground water or limestone... The ground well is stuffed with bentonite material and non-corrosive material to boost resistivity.
To carry out such a grounding you may need and then to depend on enhanced or maybe more advanced grounding put in order to calculate correctly the grounding resistance since programs for example ETAP or SKM do not have the required capability to do these calculations as the grounding resistance of the equivalent model is not easily calculated. The grounding resistance of an deep ground well can be calculated by numerical analysis application according soil model. The SES application works extremely well.
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