5-162 L90 Line Differential Relay GE Multilin5.6 CONTROL ELEMENTS 5 SETTINGS5NOTES ON THE SYNCHROCHECK FUNCTION:1. The selected sources for synchrocheck inputs V1 and V2 (which must not be the same source) may include both athree-phase and an auxiliary voltage. The relay will automatically select the specific voltages to be used by the synch-rocheck element in accordance with the following table.The voltages V1 and V2 will be matched automatically so that the corresponding voltages from the two sources will beused to measure conditions. A phase to phase voltage will be used if available in both sources; if one or both of theSources have only an auxiliary voltage, this voltage will be used. For example, if an auxiliary voltage is programmed toVAG, the synchrocheck element will automatically select VAG from the other source. If the comparison is required on aspecific voltage, the user can externally connect that specific voltage to auxiliary voltage terminals and then use this"Auxiliary Voltage" to check the synchronism conditions.If using a single CT/VT module with both phase voltages and an auxiliary voltage, ensure that only the auxiliary voltageis programmed in one of the sources to be used for synchrocheck.Exception: Synchronism cannot be checked between Delta connected phase VTs and a Wye con-nected auxiliary voltage.2. The relay measures frequency and Volts/Hz from an input on a given source with priorities as established by the con-figuration of input channels to the source. The relay will use the phase channel of a three-phase set of voltages if pro-grammed as part of that source. The relay will use the auxiliary voltage channel only if that channel is programmed aspart of the Source and a three-phase set is not.NO. V1 OR V2(SOURCE Y)V2 OR V1(SOURCE Z)AUTO-SELECTEDCOMBINATIONAUTO-SELECTED VOLTAGESOURCE Y SOURCE Z1 Phase VTs andAuxiliary VTPhase VTs andAuxiliary VTPhase Phase VAB2 Phase VTs andAuxiliary VTPhase VT Phase Phase VAB3 Phase VT Phase VT Phase Phase VAB4 Phase VT andAuxiliary VTAuxiliary VT Phase Auxiliary V auxiliary(as set for Source z)5 Auxiliary VT Auxiliary VT Auxiliary Auxiliary V auxiliary(as set for selected sources)NOTE
