Determining Ground Insulation Parameters in Quarry Distribution Networks of Mining Companies in Tajikistan

The article deals with the brief description of mining companies in the Republic of Tajikistan (RT) and isolation levels of 6 kV quarry distribution networks. The specified network isolation parameters relative to the earth were determined by calculations based on the methods developed at the Department of “Life safety”, South Ural State University (SUSU). Calculations of insulation relative to the ground in quarry distribution electric networks of mining companies in the Republic of Tajikistan have shown that the value of capacitance currents of single-phase earth fault lies within 0.1 A to 0.37 A and depends on development levels of the companies. The active insulation resistances of the network phases relative to the ground are in the range from 18 k k Ω to 112 k Ω, considering the change in the network quiescence coefficient. The network capacity relative to the ground is in the range from 0.09 μF to 0.34 μF. The data obtained is necessary for selecting a security tool and evaluating the level of security.