Minimum level of impedance in % of range (ZMax-ZMin) used as indication ofzero impedance (zero point clamping). Measured values below ZZeroDb are forcedto zero.ZHiHiLim, ZHiLim, ZLowLim and ZLowLowLimAll measured values are supervised against these four settable limits. It providesthe attribute "range" in the data class MV (measured value) with the typeENUMERATED (normal, high, low, high-high and low-low) inZMFCPDIS.ZMMMXU.ZLimHysHysteresis value in % of range (ZMax-ZMin), common for all limits. It is used toavoid the frequent update of the value for the attribute “range”.ZMaxEstimated maximum impedance value. An impedance that is higher than ZMax hasthe quality attribute as “Out of Range”.ZMinEstimated minimum impedance value. An impedance that is lower than ZMin hasthe quality attribute as “Out of Range”.8.14 Power swing detection ZMRPSB IP14499-1 v38.14.1 IdentificationM14853-1 v3Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberPower swing detection ZMRPSBZpsbSYMBOL-EE V1 EN-US688.14.2 Application IP14969-1 v18.14.2.1 General M13874-3 v3Various changes in power system may cause oscillations of rotating units. The mosttypical reasons for these oscillations are big changes in load or changes in powersystem configuration caused by different faults and their clearance. As the rotatingmasses strive to find a stable operate condition, they oscillate with dampedoscillations until they reach the final stability.1MRK 506 369-UEN B Section 8Impedance protectionLine distance protection REL670 2.2 IEC 407Application manual
