Measuring principles...................................................................120CVT filter.....................................................................................122Simplified logic diagrams............................................................122Zone tripping logic...................................................................... 123Technical data................................................................................. 125Phase selection with load encroachment, quadrilateralcharacteristic FDPSPDIS (21).............................................................. 126Identification.................................................................................... 126Functionality.................................................................................... 127Function block................................................................................. 127Signals.............................................................................................128Settings............................................................................................129Operation principle.......................................................................... 130Phase-to-ground fault................................................................. 132Phase-to-phase fault.................................................................. 134Three-phase faults......................................................................135Load encroachment....................................................................136Minimum operate currents..........................................................141Simplified logic diagrams............................................................142Technical data................................................................................. 147Faulty phase identification with load enchroachment for mhoFMPSPDIS (21).................................................................................... 147Identification.................................................................................... 147Functionality.................................................................................... 147Function block................................................................................. 148Signals.............................................................................................148Settings............................................................................................149Operation principle.......................................................................... 149The phase selection function......................................................149Technical data................................................................................. 160Additional distance protection directional function for ground faultsZDARDIR (21D)....................................................................................160Identification.................................................................................... 160Functionality.................................................................................... 161Function block................................................................................. 161Signals.............................................................................................161Settings............................................................................................162Operation principle.......................................................................... 162Technical data................................................................................. 165Directional impedance quadrilateral and mho ZDNRDIR (21D)........... 165Table of contents3Technical manual
