Section 19 Remote communication19.1 Binary signal transfer IP12423-1 v219.1.1 IdentificationM14849-1 v2Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberBinary signal transfer BinSignReceive - -Binary signal transfer BinSignTransm - -19.1.2 Application IP16245-1 v1M12844-3 v3The IEDs can be equipped with communication devices for line differential communicationand/or communication of binary signals between IEDs. The same communication hardware isused for both purposes.Communication between two IEDs geographically on different locations is a fundamental partof the line differential function.Sending of binary signals between two IEDs, one in each end of a power line is used inteleprotection schemes and for direct transfer trips. In addition to this, there are applicationpossibilities, for example, blocking/enabling functionality in the remote substation, changingsetting group in the remote IED depending on the switching situation in the local substationand so on.When equipped with a LDCM, a 64 kbit/s communication channel can be connected to the IED,which will then have the capacity of 192 binary signals to be communicated with a remote IED.19.1.2.1 Communication hardware solutions M12844-11 v4The LDCM (Line Data Communication Module) has an optical connection such that two IEDscan be connected over a direct fiber (multimode), as shown in figure 212. The protocol used isIEEE/ANSI C37.94. The distance with this solution is typical 110 km.LDCMLD CMLDCMLDCMLDCMLD CMLDCMLDCMLD CMLD CMLDCMLDCMLDCMLDCMLDCMLDCMen06000519-2.vsdIEC06000519 V2 EN-USFigure 212: Direct fiber optical connection between two IEDs with LDCMThe LDCM can also be used together with an external optical to galvanic G.703 converter orwith an alternative external optical to galvanic X.21 converter as shown in figure 213. These1MRK 511 358-UEN A Section 19Remote communication431Application manual
