Second harmonic blocking element.................................................202Technical data................................................................................. 203Four step residual overcurrent protection, zero, negative sequencedirection EF4PTOC (51N/67N)............................................................. 203Identification ................................................................................... 203Functionality.................................................................................... 204Function block................................................................................. 204Signals.............................................................................................205Settings............................................................................................206Monitored data.................................................................................209Operation principle.......................................................................... 209Operating quantity within the function........................................ 209Internal polarizing....................................................................... 210External polarizing for ground-fault function............................... 213Base quantities within the protection.......................................... 214Internal ground-fault protection structure....................................214Four residual overcurrent steps..................................................214Directional supervision element with integrated directionalcomparison function................................................................... 215Second harmonic blocking element.................................................220Technical data................................................................................. 221Sensitive directional residual overcurrent and power protectionSDEPSDE (67N)...................................................................................222Identification.................................................................................... 222Functionality.................................................................................... 222Function block................................................................................. 222Signals.............................................................................................223Settings............................................................................................223Monitored data.................................................................................225Operation principle ......................................................................... 225Function inputs........................................................................... 225Directional residual current protection measuring 3I0·cos φ.......226Directional residual power protection measuring 3I0 · 3V0 · cos φ229Directional residual current protection measuring 3I0 and φ...... 230Directional functions................................................................... 231Non-directional ground fault current protection.......................... 231Residual overvoltage release and protection............................. 231Technical data................................................................................. 233Thermal overload protection, two time constants TRPTTR (49)...........234Identification ................................................................................... 234Table of contents6Technical manual
