The configuration of this data flow is made in the SMT tool, as shown in figure 38.Currents fromremote end 1Currents toremote end 1Currents fromremote end 2Currents toremote end 2LDCM 2LDCM 1Currents fromlocal CT A/DSMAIPre-processingblockLine DifferentialfunctionL3DPDIFIEC05000533-2-en.vsdIEC05000533-NEW V2 EN-USFigure 38: Typical configuration of the analog signals for a three terminal line (exampleshowing 670 device)Figure 38 shows how one IED in a three terminal line differential protection can be configured.Notice that there are two LDCMs, each one supporting a duplex connection with a remote lineend. Thus, the same local current is configured to both LDCMs, whilst the received currentsfrom the LDCMs are configured separately to Line differential protection.6.2.2.7 Configuration of LDCM output signals M12022-93 v3There are a number of signals available from the LDCM that can be connected to the virtualbinary inputs (SMBI) and used internally in the configuration. The signals appear only in theSignal Matrix tool where they can be mapped to the desired virtual input.For explanation of the signals, refer to section Remote communication, Binary signal transferto remote end in the technical reference manual. The signal name is found in the ObjectProperties window by clicking on the input signal number in the Signal Matrix tool. Connectthe signals to the virtual inputs as desired, as shown in figure1MRK 505 363-UEN A Section 6Differential protection79Application manual
