Calculating settings for step 1...................................................... 44Calculating settings for four step phase overcurrent protection 3-phase output, LV-side OC4PTOC (51_67)........................................ 46Calculating general settings......................................................... 47Calculating settings for step 1 ..................................................... 47Calculating settings for step 4...................................................... 48Calculating settings for four step residual overcurrent protection,zero or negative sequence direction HV-side EF4PTOC (51N/67N).50Calculating general settings......................................................... 51Calculating settings for step 1...................................................... 52Calculating settings for step 2...................................................... 54Calculating settings for step 4...................................................... 55Calculating settings for two step residual overvoltage protectionLV-side, ROV2PTOV (59N)...............................................................55Calculating settings for HV-side breaker failure protection,CCRBRF (50BF)................................................................................57Calculating settings for LV-side breaker failure protection,CCRBRF (50BF)................................................................................58Section 4 Analog inputs.......................................................................61Introduction............................................................................................. 61Setting guidelines................................................................................... 61Setting of the phase reference channel.............................................61Relationships between setting parameter Base Current, CT ratedprimary current and minimum pickup of a protection IED..................62Setting of current channels................................................................62Example 1.....................................................................................63Example 2.....................................................................................64Examples on how to connect, configure and set CT inputs formost commonly used CT connections..........................................66Example on how to connect a wye connected three-phase CTset to the IED................................................................................67Setting of voltage channels............................................................... 70Example........................................................................................71Examples how to connect, configure and set VT inputs formost commonly used VT connections..........................................71Examples on how to connect a three phase-to-groundconnected VT to the IED.............................................................. 72Example on how to connect a phase-to-phase connected VTto the IED......................................................................................73Section 5 Local human-machine interface.......................................... 77Table of contents2Application manual
