Snack's 1967

How Could We Reduce Ground Resistance?

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

A great knowledge of soil resistivity and related exams are extremely important. Some guidelines must be established for the soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is vital particularly if deep grounding/earthing elements will probably be used.

A better than acceptable ground resistance would affect the safe operation of power system. Several various methods was applied to earlier times to lower the grounding resistance with the grounding system. Methods include enlarging the grounding/earthing grid, connecting the key grounding grid having an 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 round the grounding grid with low resistivity materials and chemicals.

They are suitable for different geographical situations however that does not mean they're going to work with out a correct soil resistivity testing or proper evaluation and without assortment of acceptable data to justify their application. In reality, in a specific soil environment, two or more methods may very well be to reduce the grounding resistance effectively.

The strategy to add deep vertical grounding electrodes for the grounding grid is quite effective in substations with small area. This method can utilize low-resistivity soil layer and eliminate the high resistivity soil at the surface impacted by freezing and occasional temperature. In order 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 strategy is also afflicted with cost.

One efficient strategy to decrease the earthing resistance of substation is with deep ground wells electrodes. Various kinds deep ground wells exist: By way of example it is possible to drill 150 mm ground well and go 50 meters to 85 meters deep or maybe more in the earth before you reach moist soil ground water or limestone... The soil well is loaded with bentonite material and non-corrosive material to further improve resistivity.

To get your house this kind of grounding you may need and also to depend upon enhanced or even more advanced grounding put in order to calculate correctly the grounding resistance since programs like ETAP or SKM don't have the specified capacity to do these calculations since the grounding resistance of 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 software program can be used.

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