GE Multilin D30 Line Distance Protection System 5-1255 SETTINGS 5.6 GROUPED ELEMENTS5Ensure that the Phase VT Secondary Voltage setting (see the SETTINGS ðò SYSTEM SETUP ð ACINPUTS ðò VOLTAGE BANK menu) is set correctly to prevent improper operation of associatedmemory action.• PHS DIST Z1 DIR: All phase distance zones are reversible. The forward direction is defined by the PHS DIST Z1 RCAsetting, whereas the reverse direction is shifted 180° from that angle. The non-directional zone spans between the for-ward reach impedance defined by the PHS DIST Z1 REACH and PHS DIST Z1 RCA settings, and the reverse reach imped-ance defined by PHS DIST Z1 REV REACH and PHS DIST Z1 REV REACH RCA as illustrated below.• PHS DIST Z1 SHAPE: This setting selects the shape of the phase distance function between the mho and quadrilat-eral characteristics. The selection is available on a per-zone basis. The two characteristics and their possible varia-tions are shown in the following figures.Figure 5–52: DIRECTIONAL MHO DISTANCE CHARACTERISTICFigure 5–53: NON-DIRECTIONAL MHO DISTANCE CHARACTERISTIC837720A1.CDRXRREACHRCADIR RCADIR COMP LIMITDIR COMP LIMITCOMP LIMIT837802A1.CDRXRRCACOMP LIMITR E V R E AC H R E AC HREV REACHRCA
