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Topics >> by altodill08 >> Tips about how Should We Decrease Ground Resistance?

Tips about how Should We Decrease Ground Resistance? Photos
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Sometimes adding more ground rods and pipes will not do achieve almost anything to bring the bottom resistance down in high resistivity areas. Especially sometimes, adding more ground rods is not going to do anything to create the resistance down (the resistance stays precisely the same).

A fantastic understanding of soil resistivity and related testing is extremely important. Some guidelines ought to be established to the soil testing. Similarly the testing and spacing to ascertain the soil resistivity with depth is very important particularly when deep grounding/earthing elements are going to be used.

A greater than acceptable ground resistance would get a new safe operation of power system. Several various methods ended up applied in earlier times to decrease the grounding resistance from the grounding system. Methods include enlarging the grounding/earthing grid, connecting the main grounding grid having an external grounding grid, increasing the burial depth in the grounding grid, utilizing natural grounding object for example 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.

These techniques are suitable for different geographical situations but that doesn't imply they'll work without a correct soil resistivity testing or proper evaluation and without number of acceptable data to warrant their application. Actually, inside a specific soil environment, a couple of methods can be viewed to lower the grounding resistance effectively.



The technique to incorporate deep vertical grounding electrodes towards the grounding grid is very efficient at substations with small area. This process can make use of the low-resistivity soil layer and remove the high resistivity soil close to the surface afflicted with freezing and occasional temperature. To be able to reduce the grounding resistance, the explosive grounding technique was proposed to diminish the grounding resistance of grounding grids in high resistivity area. The look at the explosive grounding technique as with any grounding technique is also suffering from cost.

One efficient strategy to decrease the earthing resistance of substation is by using 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 higher in the ground unless you reach moist soil ground water or limestone... The ground well is filled with bentonite material and non-corrosive material to enhance resistivity.

To do this sort of grounding you will need and also to rely on enhanced or more advanced grounding enter in to calculate correctly the grounding resistance since programs like ETAP or SKM don't have the necessary capacity to do these calculations for the reason that grounding resistance of the equivalent model is not easily calculated. The grounding resistance of a deep ground well may be calculated by numerical analysis software package according soil model. The SES software package can be used.

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