en05000114.vsdTRSP ttEFI0CHECKANDBLKI02 t10 msANDBLKI01BLOCKINHIBITZOUTL3ZOUTL2ZOUTL1DET1of3 - int.REL1PHBLK1PH ANDDET2of3 - int.REL2PHBLK2PH ANDEXTERNALAND STARTZOUTZINL1ZINL2ZINL3ZINAND ttR1ttR2ORANDANDORORORORORttH-loop-loopIEC05000114 V1 EN-USFigure 69: Simplified block diagram for ZMRPSB function7.2.6.5 Operating and inhibit conditions M13877-38 v4Figure 69 presents a simplified logic diagram for the Power swing detectionfunction ZMRPSB. The internal signals DET1of3 and DET2of3 relate to thedetailed logic diagrams in figure 67 and figure 68 respectively.Selection of the operating mode is possible by the proper configuration of thefunctional input signals REL1PH, BLK1PH, REL2PH, and BLK2PH.The load encroachment characteristic can be switched off by setting the parameterOperationLdCh = Off, but notice that the DFw and DRv will still be calculated fromRLdOutFw and RLdOutRv. The characteristic will in this case be onlyquadrilateral.There are four different ways to form the internal INHIBIT signal:1MRK 505 394-UEN A Section 7Impedance protectionLine differential protection RED650 2.2 IEC 153Technical manual