Improving the efficiency of relay protection at a mining and processing plant

The paper presents the results of constructing effective relay protection in power supply system a mining and processing plant (MPP). A brief description MPP is given, substitution circuits used to calculate short-circuit currents are given. statistical analysis failures electric network has been carried out, which makes it possible draw conclusions about nature ranges. Analysis registered faults shows that significant part them line-to-earth faults, most cases turn into multiphase short circuits, interrupted by overcurrent protection. In order improve efficiency reliability protection, scheme was refined analyzed. calculation made, made settings give recommendations on place its installation adjustment ensure normal operation electricity consumers. To reduce number cable insert line leaving administrative household complex (AHC), increase consumers, advisable divide capacities existing 10 kV two parallel ones laying second line. It recommended install current cut-off outgoing AHC, feasibility shown calculations. This will chance gland. Data setting given selectivity card.