Tips about how Can We Reduce Ground Resistance?
Sometimes adding more ground rods and pipes won't do achieve something to bring the floor 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 precisely the same).
A great idea of soil resistivity and related testing is essential. Some guidelines must be established for the soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is very important particularly when deep grounding/earthing elements will probably be used.
A higher than acceptable ground resistance would get a new safe operation of power system. Several various methods have been used in earlier times to diminish the grounding resistance from the grounding system. Methods include enlarging the grounding/earthing grid, connecting the principle grounding grid by having an external grounding grid, improving the burial depth of the grounding grid, utilizing natural grounding object such as steel foundations of structures, adding long vertical grounding electrodes or pipes, and changing the soils around the grounding grid with low resistivity materials and chemicals.
They are suitable for different geographical situations however that does not necessarily mean 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, in the specific soil environment, 2 or more methods can be considered to diminish the grounding resistance effectively.
The technique to provide deep vertical grounding electrodes to the grounding grid is extremely effective in substations with small area. This method can make use of the low-resistivity soil layer and remove the high resistivity soil close to the surface suffering from freezing and occasional temperature. To be able to reduce 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 afflicted with cost.
One efficient method to slow up the earthing resistance of substation is by using deep ground wells electrodes. Several kinds of deep ground wells exist: As an example you can drill 150 mm ground well and go 50 meters to 85 meters deep or even more in the ground and soon you reach moist soil ground water or limestone... The floor well is filled with bentonite material and non-corrosive material to further improve resistivity.
To get your house this kind of grounding you may need also to rely on enhanced or higher advanced grounding program in to calculate correctly the grounding resistance since programs such as ETAP or SKM will not have the specified capability to do these calculations because the grounding resistance with the equivalent model can not be easily calculated. The grounding resistance of a deep ground well could be calculated by numerical analysis program according soil model. The SES software program may be used.
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