These signals shall be used for communication based ground-fault teleprotectioncommunication schemes (permissive or blocking).Simplified logic diagram for directional supervision element with integrated directionalcomparison step is shown in Figure 61:Xaa>bbIDirPUpolMethod=VoltagepolMethod=DualORFORWARD_IntREVERSE_IntBLOCKSTAGE1_DIR_Int0.6X0.4ANDSTAGE3_DIR_IntSTAGE4_DIR_IntSTAGE2_DIR_Int ORPUREVVPolMinIPolMinAngleRCATF0.0X TFRNPolXNPol 0.0DirectionalCharacteristicFWDRVS ANDANDAND PUFWFORWARD_IntREVERSE_IntANDANSI07000067-4-en.vsd| |VPolVIPolI3PDIRVTPolIopDirComplexNumberaa>bbIPol TF0.0polMethod=Current ORANSI07000067 V4 EN-USFigure 61: Simplified logic diagram for directional supervision element with integrated directional comparisonstep8.2.7.9 Second harmonic blocking element M13941-200 v8A harmonic restrain can be chosen for each step by a parameter setting HarmBlockx. Ifthe ratio of the 2nd harmonic component in relation to the fundamental frequencycomponent in the residual current exceeds the preset level (defined by parameter1MRK 511 408-UUS A Section 8Current protectionPhasor measurement unit RES670 2.2 ANSI 207Technical manual
