McCullough Perkins posted an update 11 months, 1 week ago
Sometimes adding more ground rods and pipes won’t do achieve anything to bring the floor resistance down in high resistivity areas. Especially sometimes, adding more ground rods won’t do anything whatsoever to take the resistance down (the resistance stays the identical).
A fantastic comprehension of soil resistivity and related testing is essential. Some guidelines needs to be established for that soil testing. Similarly the testing and spacing to look for the soil resistivity with depth is very important especially if deep grounding/earthing elements will be used.
A greater than acceptable ground resistance would modify the safe operation of power system. Several various methods have been applied in the past to decrease the grounding resistance in the grounding system. Methods include enlarging the grounding/earthing grid, connecting the key grounding grid having an external grounding grid, enhancing 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 around the grounding grid with low resistivity materials and chemicals.
These procedures are compatible with different geographical situations but that does not mean they are going to work with no correct soil resistivity testing or proper evaluation and without variety of acceptable data to justify their application. In fact, in a specific soil environment, two or more methods may very well be to lower the grounding resistance effectively.
The process to provide deep vertical grounding electrodes for the grounding grid is quite great at substations with small area. Using this method can utilize the low-resistivity soil layer and get rid of the high resistivity soil close to the surface affected by freezing and low temperature. To be able to slow up the grounding resistance, the explosive grounding technique was proposed to lower the grounding resistance of grounding grids in high resistivity area. The look at the explosive grounding technique as with any grounding way is also suffering from cost.
One efficient way to limit the earthing resistance of substation is by using deep ground wells electrodes. Several kinds of deep ground wells exist: By way of example you are able to drill 150 mm ground well and go 50 meters to 85 meters deep or higher on your lawn unless 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 need and also to rely on enhanced or maybe more advanced grounding put in order to calculate correctly the grounding resistance since programs like ETAP or SKM do not have the mandatory chance to do these calculations for the reason that grounding resistance with the equivalent model cannot be easily calculated. The grounding resistance of a deep ground well could be calculated by numerical analysis software package according soil model. The SES application can be utilized.
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