Determination of the parameters of an electrical grounding and shielding system making a case of expansion in a distributed generation plant
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Abstract
The present investigation deals with the simulation of the shielding and grounding systems in a distributed generation plant because faults have arisen in it, causing damage to the protection equipment, in turn a future expansion has been considered. For which soil resistivity and grounding resistance were measured using Std. IEEE 81, obtaining values of up to 40.4 Ω-m and 986 Ω respectively along the ground and common ground points. Subsequently, the systems were modeled in ETAP; under current conditions with the soil resistivity value of 23.57 Ω-m, determining a resistance of 0.588 Ω, and a touch voltage of 854.4 V, which exceeds the tolerable values of the regulations, as well as according to the modeling of the rolling spheres for the current shielding system made up of a dipole-type lightning rod; 3 of the generators are outside the protection zone and when an expansion is implemented, this set of protections would not provide the necessary guarantees for the proper functioning of the plant. For which they raised better the system; which were verified by simulation; obtaining grounding values of 0.414 Ω and touch voltage of 589 V which are within the permissible limits, in addition to designing the expansion.
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References
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