Table 238:ZCLCPSCH Non group settings (basic)Name Values (Range) Unit Step Default DescriptionGlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global BaseValue groups13.3.6 Operation principle13.3.6.1 Zone extension M13819-3 v2The overreaching zone is connected to the input EXACC. For this reason,configure the ARREADY functional input to a READY functional output of a usedautoreclosing function or via the selected binary input to an external autoreclosingdevice, see figure 205.This will allow the overreaching zone to trip instantaneously.IEC05000157 V1 EN-USFigure 205: Simplified logic diagram for local acceleration logicAfter the autorecloser initiates the close command and remains in the reclaim state,there will be no ARREADY signal, and the protection will trip normally with stepdistance time functions.In case of a fault on the adjacent line within the overreaching zone range, anunwanted autoreclosing cycle will occur. The step distance function at the reclosingattempt will prevent an unwanted retrip when the breaker is reclosed.On the other hand, at a persistent line fault on line section not covered byinstantaneous zone (normally zone 1) only the first trip will be "instantaneous".The function will be blocked if the input BLOCK is activated (common with loss-of-load acceleration).13.3.6.2 Loss-of-Load acceleration M13819-9 v5When the "acceleration" is controlled by a loss-of-load, the overreaching zone usedfor "acceleration" connected to input LLACC is not allowed to trip"instantaneously" during normal non-fault system conditions. When all three-phaseSection 13 1MRK 505 394-UEN AScheme communication416 Line differential protection RED650 2.2 IECTechnical manual
