IAIBICab aab aab aIDLDPUVAVBVCab aab aab aVDLDPUORANDANDANDANDAND ANDANDAllCurrLowDeadLineDet1PhDLD3PHDLD1PHintBlockDead Line DetectionANSI0000035-1-en.vsdANSI0000035 V1 EN-USFigure 133: Simplified logic diagram for Dead Line detection part13.2.7.4 Main logic GUID-D474A49E-D3A8-438C-B7E4-E527FEC2F335 v6A simplified diagram for the functionality is found in figure 134. The fuse failuresupervision function (FUFSPVC) can be switched on or off by the setting parameterOperation to Enabled or Disabled.For increased flexibility and adaptation to system requirements an operation modeselector, OpModeSel, has been introduced to make it possible to select differentoperating modes for the negative and zero sequence based algorithms. The differentoperation modes are:• Disabled. The negative and zero sequence function is disabled.• V2I2. Negative sequence is selected.• V0I0. Zero sequence is selected.• V0I0 OR V2I2. Both negative and zero sequence are activated and work in parallelin an OR-condition.• V0I0 AND V2I2. Both negative and zero sequence are activated and work in series(AND-condition for operation).• OptimZsNs. Optimum of negative and zero sequence current (the function that hasthe highest magnitude of measured negative and zero sequence current will beactivated).1MRK 511 408-UUS A Section 13Secondary system supervisionPhasor measurement unit RES670 2.2 ANSI 377Technical manual
