G2CB2CB1G1Bus1 Bus2Bus3 Bus4GUID-E39F2BFC-3124-4C9F-877F-6C45B478E80E V1 ENFigure 784: Example of an internally connected networkExternally connectedA network where both Bus3 and Bus4 are connected to the grid across CB1 isconsidered an externally connected network.CB2CB1Bus1 Bus2TX1 TX2Bus3 Bus4GUID-F986E960-C6CF-4F8F-B5B0-03196BABBDA9 V1 ENFigure 785: Example of an externally connected networkThe number of sources active in the voltage and frequency matching is shared tosources via the corresponding output signal ASC_SRC1_DAT...ASC_SRC8_DAT.The binary input BLOCK can be used to block the function. The activation of theBLOCK input deactivates all binary outputs and resets the internal timers.9.8.5 ApplicationA circuit breaker is used to connect two different power networks. It is essential toensure that these power networks are synchronized before closing the CB, otherwiseit may lead to disturbances in the power system, causing stress and damage to theconnected equipment.The synchronization of any bus coupler or tie feeder is not feasible if the voltage andfrequency differences across the circuit breaker are not within the allowed limits. Inthis case, the sources which are part of the power network connected across this bus1MRS759142 C Section 9Control functionsREX640 1461Technical Manual
