Table 411:Input integer value converted to binary output signalsMeasured supervisedvalue is:below low-lowlimitbetween low‐low and lowlimitbetween lowand high limitbetween high-high and highlimitabove high-high limitOutput:LOWLOW HighLOW HighNORMAL HighHIGH HighHIGHHIGH High15.9 Fault locator LMBRFLO IP14592-1 v215.9.1 IdentificationM14892-1 v3Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFault locator LMBRFLO - -15.9.2 Functionality M13970-3 v13The accurate fault locator is an essential component to minimize the outages after apersistent fault and/or to pin-point a weak spot on the line.The fault locator is an impedance measuring function giving the distance to thefault in km, miles or % of line length. The main advantage is the high accuracyachieved by compensating for load current and for the mutual zero-sequence effecton double circuit lines.The compensation includes setting of the remote and local sources and calculationof the distribution of fault currents from each side. This distribution of faultcurrent, together with recorded load (pre-fault) currents, is used to exactly calculatethe fault position. The fault can be recalculated with new source data at the actualfault to further increase the accuracy.Especially on heavily loaded long lines, where the source voltage angles can be upto 35-40 degrees apart, the accuracy can be still maintained with the advancedcompensation included in fault locator.Section 15 1MRK 505 394-UEN AMonitoring590 Line differential protection RED650 2.2 IECTechnical manual
