contacts, the right voltages for the synchronism check and energizing check functions canbe selected.Available voltage selection types are for single circuit breaker with double busbars and thebreaker-and-a-half arrangement. A double circuit breaker arrangement and single circuitbreaker with a single busbar do not need any voltage selection function. Neither does asingle circuit breaker with double busbars using external voltage selection need anyinternal voltage selection.The voltages from busbars and lines must be physically connected to the voltage inputs inthe IED and connected, using the control software, to each of the SESRSYN (25)functions available in the IED.11.1.2.5 External fuse failureEither external fuse-failure signals or signals from a tripped fuse (or miniature circuitbreaker) are connected to HW binary inputs of the IED; these signals are connected toinputs of SESRSYN function in the application configuration tool of PCM600. Theinternal fuse failure supervision function can also be used, for at least the line voltagesupply. The signal BLKU, from the internal fuse failure supervision function, is then usedand connected to the fuse supervision inputs of the energizing check function block. Incase of a fuse failure, the SESRSYN energizing (25) function is blocked.The VB1OK/VB2OK and VB1FF/VB2FF inputs are related to the busbar voltage and theVL1OK/VL2OK and VL1FF/VL2FF inputs are related to the line voltage.External selection of energizing directionThe energizing can be selected by use of the available logic function blocks. Below is anexample where the choice of mode is done from a symbol on the local HMI throughselector switch function block, but alternatively there can for example, be a physicalselector switch on the front of the panel which is connected to a binary to integer functionblock (B16I).If the PSTO input is used, connected to the Local-Remote switch on the local HMI, thechoice can also be from the station HMI system, typically ABB Microscada through IEC61850–8–1 communication.The connection example for selection of the manual energizing mode is shown in figure131. Selected names are just examples but note that the symbol on the local HMI can onlyshow the active position of the virtual selector.Section 11 1MRK 506 334-UUS AControl292Application manual
