Example how CVMMXN is operating:The following outputs can be observed on the local HMI under Measurements/Monitoring/Servicevalues(P_Q)/CVMMXN(P_Q)S Apparent three-phase powerP Active three-phase powerQ Reactive three-phase powerPF Power factorILAG I lagging UILEAD I leading UU System mean voltage, calculated according to selected modeI System mean current, calculated according to selected modeF FrequencyThe settings for this function is found under Measurements/Monitoring/Servicevalues(P_Q)/CVMMXN(P_Q)It can be seen that:• When system voltage falls belowUGenZeroDB, the shown value for S, P, Q, PF, ILAG, ILEAD,U and F on the local HMI is forced to zero• When system current falls belowIGenZeroDB, the shown value for S, P, Q, PF, ILAG, ILEAD,U and F on the local HMI is forced to zero• When the value of a single signal falls below the set dead band for that specific signal, thevalue shown on the local HMI is forced to zero. For example, if apparent three-phasepower falls belowSZeroDb the value for S on the local HMI is forced to zero.15.1.4 Setting guidelines SEMOD54481-165 v13The available setting parameters of the measurement function CVMMXN, CMMXU, VMMXU,CMSQI, VMSQI, VNMMXU are depending on the actual hardware (TRM) and the logicconfiguration made in PCM600.The parameters for the Measurement functions CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,VNMMXU are set via the local HMI or PCM600.GlobalBaseSel: Selects the global base value group used by the function to define (IBase),(UBase) and (SBase).Operation:Off/On. Every function instance (CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,VNMMXU) can be taken in operation (On) or out of operation (Off).The following general settings can be set for the Measurement function (CVMMXN).PowAmpFact: Amplitude factor to scale power calculations.PowAngComp: Angle compensation for phase shift between measured I & U.Mode: Selection of measured current and voltage. There are 9 different ways of calculatingmonitored three-phase values depending on the available VT inputs connected to the IED. Seeparameter group setting table.k: Low pass filter coefficient for power measurement, U and I.1MRK 505 363-UEN A Section 15Monitoring285Application manual
