The study is dedicated to addressing the urgent problem of ensuring electrical safety in mines, where high humidity, dust content, and limited space pose specific risks of electric shock. The goal of the study has been to develop recommendations on selecting earth leakage protection settings, considering the actual state of the insulation of underground electrical grids and ensuring minimum electrical safety of personnel. Within the frameworks of the study, a comprehensive analysis of the state of insulation of cable lines, leakage currents, and the efficiency of the existing protection devices has been conducted. It has been shown that the resistance of insulation significantly depends on humidity, whereas the activation time depends on the leakage current. It has been determined that the existing protection devices do not always ensure a fast response to current leakages, especially in the case of the low resistance of the human body. It has been proposed to use protection devices with boosted actuation speed and regularly check their operability. Empirical dependencies to determine optimal protection settings considering active resistance of insulation have been developed. The study results demonstrate that the comprehensive approach, including monitoring over the insulation state, optimizing protection settings, and advanced training for personnel, is required to ensure electrical safety in mines.
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