DeltaIL1DeltaUL1DeltaIL2DeltaUL2DeltaIL3DeltaUL3STDIL1STDIL2STDIL3STDISTDUSTDUL1STDUL2STDUL3IEC12000165-1-en.vsdintBlockOROR20 ms20 msORt20 mst20 mst20 msANDANDANDANDANDANDANDANDt20 mst20 mst20 mst20 msttIEC12000165 V1 EN-USFigure 139: Internal signals DeltaU or DeltaI and the corresponding outputsignals11.2.7.3 Dead line detection M13679-44 v4A simplified diagram for the functionality is found in figure 140. A dead phasecondition is indicated if both the voltage and the current in one phase is below theirrespective setting values UDLD< and IDLD<. If at least one phase is considered tobe dead the output DLD1PH and the internal signal DeadLineDet1Ph is activated.If all three phases are considered to be dead the output DLD3PH is activated1MRK 505 394-UEN A Section 11Secondary system supervisionLine differential protection RED650 2.2 IEC 295Technical manual
