3.3.1 DIRECTIONAL OVERCURRENT LOGICI >1 Timer BlockV00743Blinder Function3Ph(based on Z 1)Z1 LoadBlinderI> Blocking 2Blinder Blk I>1VTS Fast BlockI> BlockingVTS Blocks I>1DirectionalcheckI>1 DirectionI>1 Start AI>1 Trip AIA 2H StartI> Blocking2H Block I>12H 1PH BLOCKI>1 Current Set&IDMT/DTTimer Settings&I2H Any StartI> Blocking2H Block I>12H 1PH BLOCK&&&&Notes: This diagram does not show all stages . Other stages followsimilar principles.This diagram does not show all phases . Other phases followsimilar principles.Load blinder functionality is only available for stages 1, 2 and 5and on selected directional models .AR blocking is only available for stages 3, 4 and 6AR Blk Main ProtI>BlockingAR Blocks I>3&AR blocking available for DT-only stagesLoad Blinder blocking available for stages 1, 2 and 5I >1 Char AngleI>1 Trip AngleIAIAVAB&Figure 22: Directional Overcurrent Logic diagram (Phase A shown only)Voltage Transformer Supervision (VTS) can be used to block operation of directional overcurrent elements.This is achieved using the I>Blocking cell. When the relevant bit is set to 1, operation of the VTS will block the stageif directionalised. When set to 0, the stage will revert to non-directional upon operation of the VTS.3.4 PHASE OVERCURRENT SETTINGS FOR MODEL HNote:This section only applies to Model H.In P14D model H, the following stage 1 overcurrent settings have been modified:● The maximum time delay setting for stage 1 (I>1 Time Delay) has been increased to 8 hours (28800seconds).● The maximum time dial setting for stage 1 (I>1 Time Dial) has been increased to 8 hours (28800 seconds).● The maximum definite time adder setting for stage 1 (I>1 DT Adder) has been increased to 8 hours (28800seconds).● The maximum definite time reset time for stage 1 (I>1 DT Adder) has been increased to 8 hours (28800seconds).Chapter 6 - Current Protection Functions P14D84 P14D-TM-EN-8
