SELECTION PROCESS RESOURCE relay protection and automatic reclosing of the band in cable distribution network of 6 (10) kV

摘要

Scheme relaying cable lines 6 (10) kV, characterized in that it comprises two or three-protection using current cutoff as the primary protection, overcurrent protection for head switches feeder distribution network selected as backup protection transformer substations 6 (10) / 0,4 kV; overcurrent protection stage 2 at inputs 6 (10) kV supply transformer stations selected under the terms of the detuning of the load 2 sections transformers and alignment with the protections of the subsequent and previous elements (outgoing lines 6 (10) kV and bushings 35 (110 ) kV power transformer); additional overcurrent stage 1st stage at inputs 6 (10) kV supply substations selected as backup protection cable lines conditions nonincendive agreed on response time with a current cut-off, the band automatic reclosing to head switches feeders selected from the lock works with short-circuit currents greater than the calculated at the end of the radial branch feeder cable.