Four step phase overcurrent protection OC4PTOC(51/67).................. 161Identification.................................................................................... 161Application....................................................................................... 161Setting guidelines............................................................................ 162Settings for each step.................................................................1642nd harmonic restrain.................................................................168Four step single phase overcurrent protection PH4SPTOC (51)..........174Identification.................................................................................... 174Application....................................................................................... 174Setting guidelines............................................................................ 175Settings for each step (x = 1-4).................................................. 176Second harmonic restrain...........................................................178Four step residual overcurrent protection, (Zero sequence ornegative sequence directionality) EF4PTOC (51N/67N)...................... 183Identification.................................................................................... 183Setting guidelines............................................................................ 183Settings for each step (x = 1, 2, 3 and 4)................................... 184Common settings for all steps.................................................... 1862nd harmonic restrain.................................................................188Parallel transformer inrush current logic.....................................188Switch onto fault logic.................................................................189Four step directional negative phase sequence overcurrentprotection NS4PTOC (46I2)..................................................................190Identification.................................................................................... 191Application....................................................................................... 191Setting guidelines............................................................................ 193Settings for each step ................................................................193Common settings for all steps.................................................... 196Thermal overload protection, two time constants TRPTTR (49)...........197Identification.................................................................................... 198Application....................................................................................... 198Setting guideline.............................................................................. 199Breaker failure protection CCRBRF(50BF)...........................................201Identification.................................................................................... 201Application....................................................................................... 202Setting guidelines............................................................................ 202Breaker failure protection, single phase version CCSRBRF (50BF).... 206Identification.................................................................................... 206Application....................................................................................... 206Setting guidelines............................................................................ 206Table of contents4Application manual
