5-304 D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUALCONTROL ELEMENTS CHAPTER 5: SETTINGS5SYNCHK1 V2 ANGLE SHIFT — Specifies the angle of source V2 that needs to be shifted so that V2 angle can be directlycompared with V1 angle. For example, when V1 and V2 are taken from two different windings of the transformer and withdifferent angle shift due to winding connections, the angle shift compensation must be performed before starting anglecomparison in synchrocheck element.SYNCHK1 DEAD SOURCE SELECT — Selects the combination of dead and live sources that bypass the synchronism checkfunction and permit the breaker to be closed when one or both of the two voltages (V1 or/and V2) are below the maximumvoltage threshold. A dead or live source is declared by monitoring the voltage level. Six options are available:None — Dead Source function is disabledLV1 and DV2 — Live V1 and Dead V2DV1 and LV2 — Dead V1 and Live V2DV1 or DV2 — Dead V1 or Dead V2DV1 Xor DV2 — Dead V1 exclusive-or Dead V2 (one source is Dead and the other is Live)DV1 and DV2 — Dead V1 and Dead V2SYNCHK1 DEAD V1 MAX VOLT — Establishes a maximum voltage magnitude for V1 in 1 ‘pu’. Below this magnitude, the V1voltage input used for synchrocheck is considered “Dead” or de-energized.SYNCHK1 DEAD V2 MAX VOLT — Establishes a maximum voltage magnitude for V2 in ‘pu’. Below this magnitude, the V2voltage input used for synchrocheck is considered “Dead” or de-energized.SYNCHK1 LIVE V1 MIN VOLT — Establishes a minimum voltage magnitude for V1 in ‘pu’. Above this magnitude, the V1 voltageinput used for synchrocheck is considered “Live” or energized.SYNCHK1 LIVE V2 MIN VOLT — This setting establishes a minimum voltage magnitude for V2 in ‘pu’. Above this magnitude,the V2 voltage input used for synchrocheck is considered “Live” or energized.Notes on the synchrocheck function1. The selected sources for synchrocheck inputs V1 and V2 (which must not be the same source) can include both athree-phase and an auxiliary voltage. The relay automatically selects the specific voltages to be used by thesynchrocheck element in accordance with the following table.The voltages V1 and V2 are matched automatically so that the corresponding voltages from the two sources are usedto measure conditions. A phase to phase voltage is used if available in both sources; if one or both of the Sources haveonly an auxiliary voltage, this voltage is used. For example, if an auxiliary voltage is programmed to VAG, thesynchrocheck element automatically selects VAG from the other source. If the comparison is required on a specificvoltage, the user can externally connect that specific voltage to auxiliary voltage terminals and then use this "AuxiliaryVoltage" to check the synchronism conditions.If using a single CT/VT module with both phase voltages and an auxiliary voltage, ensure that only the auxiliaryvoltage is programmed in one of the sources to be used for synchrocheck. An exception is that synchronism cannotbe checked between Delta connected phase VTs and a Wye connected auxiliary voltage.2. The relay measures frequency and Volts/Hz from an input on a given source with priorities as established by theconfiguration of input channels to the source. The relay uses the phase channel of a three-phase set of voltages ifprogrammed as part of that source. The relay uses the auxiliary voltage channel only if that channel is programmedNumber V1 or V2 (source Y) V2 or V1 (source Z) Auto-selected combination Auto-selectedvoltageSource 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 and AuxiliaryVTAuxiliary VT Phase Auxiliary V auxiliary(as set for source Z)5 Auxiliary VT Auxiliary VT Auxiliary Auxiliary V auxiliary(as set for selectedsources)
