Additional distance protection directional function for earth faultsZDARDIR..............................................................................................312Identification.................................................................................... 313Application....................................................................................... 313Setting guidelines............................................................................ 313Mho impedance supervision logic ZSMGAPC......................................315Identification.................................................................................... 315Application....................................................................................... 315Setting guidelines............................................................................ 316Faulty phase identification with load encroachment FMPSPDIS (21).. 317Identification.................................................................................... 317Application....................................................................................... 317Setting guidelines............................................................................ 318Load encroachment....................................................................319Distance protection zone, quadrilateral characteristic, separatesettings ZMRPDIS (21), ZMRAPDIS (21) and ZDRDIR (21D)............. 320Identification.................................................................................... 321Application....................................................................................... 321System grounding.......................................................................321Fault infeed from remote end..................................................... 325Load encroachment....................................................................326Short line application.................................................................. 327Long transmission line application..............................................328Parallel line application with mutual coupling............................. 328Tapped line application...............................................................335Setting guidelines............................................................................ 337General.......................................................................................337Setting of zone 1.........................................................................338Setting of overreaching zone......................................................338Setting of reverse zone...............................................................339Setting of zones for parallel line application............................... 340Setting of reach in resistive direction..........................................341Load impedance limitation, without load encroachmentfunction....................................................................................... 342Load impedance limitation, with Phase selection with loadencroachment, quadrilateral characteristic function activated ...344Setting of minimum operating currents.......................................344Setting of timers for distance protection zones...........................345Phase selection, quadrilateral characteristic with settable angleFRPSPDIS (21).................................................................................... 345Identification.................................................................................... 345Table of contentsTransformer protection RET670 2.2 ANSI 7Application manual
