The power system quantities provided, depends on the actualhardware, (TRM) and the logic configuration made in PCM600.The measuring functions CMSQI and VMSQI provide sequence componentquantities:• I: sequence currents (positive, zero, negative sequence, amplitude and angle)• U: sequence voltages (positive, zero and negative sequence, amplitude andangle).13.1.3 Zero clamping GUID-8DABC3F5-6615-493C-B839-A5C557A2FAE8 v4Measuring functions CVMMXN, CMMXU, VMMXU and VNMMXU have nointerconnections regarding any settings or parameters.Zero clampings are also handled entirely by ZeroDb separately for each function'severy output signal. For example, zero clamping of U12 is handled byUL12ZeroDb in VMMXU, zero clamping of I1 is handled by IL1ZeroDb inCMMXU, and so on.Example of CVMMXN operationOutputs seen on the local HMI under Main menu/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 FrequencyRelevant settings and their values on the local HMI under Main menu/Settings/IED settings/Monitoring/Servicevalues(P_Q)/CVMMXN(P_Q):• When system voltage falls below UGenZeroDB, values for S, P, Q, PF, ILAG,ILEAD, U and F are forced to zero.• When system current falls below IGenZeroDB, values for S, P, Q, PF, ILAG,ILEAD, U and F are forced to zero.• When the value of a single signal falls below its set deadband, the value isforced to zero. For example, if the apparent three-phase power falls belowSZeroDb, the value for S is forced to zero.1MRK 504 169-UEN A Section 13MonitoringTransformer protection RET650 2.2 IEC 269Application manual
