Sometimes adding more ground rods and pipes won't do achieve something to bring the ground resistance down in high resistivity areas. Especially sometimes, adding more ground rods will not do anything whatsoever to get the resistance down (the resistance stays precisely the same).

A good knowledge of soil resistivity and related testing is essential. Some guidelines needs to be established to the soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is important especially if deep grounding/earthing elements will probably be used.

A higher than acceptable ground resistance would modify the safe operation of power system. Several various methods had been applied in yesteryear to diminish the grounding resistance in the grounding system. Methods include enlarging the grounding/earthing grid, connecting the key grounding grid by having an external grounding grid, increasing 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 across the grounding grid with low resistivity materials and chemicals.

These procedures are compatible with different geographical situations but that does not always mean they'll work with no correct soil resistivity testing or proper evaluation and without assortment of acceptable data to warrant their application. The truth is, in the specific soil environment, several methods can be considered to diminish the grounding resistance effectively.



The strategy to add deep vertical grounding electrodes on the grounding grid is very effective in substations with small area. This process can use the low-resistivity soil layer and take away the high resistivity soil nearby 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 strategy is also affected by cost.

One efficient way to decrease the earthing resistance of substation is with deep ground wells electrodes. Several types 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 the earth until 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 and then to count on enhanced or even more advanced grounding enter in order to calculate correctly the grounding resistance since programs for example ETAP or SKM would not have the mandatory power to do these calculations for the reason that grounding resistance from the equivalent model can't be easily calculated. The grounding resistance of the deep ground well might be calculated by numerical analysis application according soil model. The SES application works extremely well.

For more info about hoa chat giam dien tro please visit site: click for more.