Tips about how Can We Reduce Ground Resistance?

Sometimes adding more ground  rods and pipes won't do achieve everything to bring the soil resistance down in  high resistivity areas. Especially sometimes, adding more ground rods is not  going to a single thing to bring the resistance down (the resistance stays the  same).
A fantastic knowledge of soil resistivity and related tests are  essential. Some guidelines should be established to the soil testing. Similarly  the testing and spacing to ascertain 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 have been used in earlier times to lower  the grounding resistance of the grounding system. Methods include enlarging the  grounding/earthing grid, connecting the key grounding grid having an external  grounding grid, improving the burial depth in the grounding grid, utilizing  natural grounding object like 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.
 They are compatible with different geographical situations  however that doesn't imply they'll work without a correct soil resistivity  testing or proper evaluation and without assortment of acceptable data to  warrant their application. Actually, inside a specific soil environment, a  couple of methods can be considered to diminish the grounding resistance  effectively.The method to add deep vertical grounding electrodes on the  grounding grid is very great at substations with small area. This technique can  utilize low-resistivity soil layer and eliminate the high resistivity soil near  the surface suffering from freezing and low temperature. To be able to decrease  the grounding resistance, the explosive grounding technique was proposed to  reduce the grounding resistance of grounding grids in high resistivity area. The  look at the explosive grounding technique just like any grounding method is also  affected by cost.
One efficient strategy to reduce the earthing resistance  of substation is with deep ground wells electrodes. Several kinds of deep ground  wells exist: For example you can drill 150 mm ground well and go 50 meters to 85  meters deep or more in your yard and soon you reach moist soil ground water or  limestone… The bottom well is filled with bentonite material and non-corrosive  material to enhance resistivity.
In order to do this sort of grounding you  may need and also to depend upon enhanced or maybe more advanced grounding enter  in to calculate correctly the grounding resistance since programs such as ETAP  or SKM do not have the specified power to do these calculations since the  grounding resistance from the equivalent model can't be easily calculated. The  grounding resistance of the deep ground well may be calculated by numerical  analysis software program according soil model. The SES software program may be  used.
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