U System mean voltage, calculated according to selected mode
I System mean current, calculated according to selected mode
F Frequency
Relevant 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 is forced
to zero. For example, if the apparent three-phase power falls below SZeroDb, the
value for S is forced to zero.
17.1.4 Setting guidelines
SEMOD54481-165 v14
The available setting parameters of the measurement function CVMMXN, CMMXU,
VMMXU, CMSQI, VMSQI, VNMMXU are depending on the actual hardware (TRM)
and the logic configuration 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, VBase and SBase as applicable.
Operation: Disabled/Enabled. Every function instance (CVMMXN, CMMXU,
VMMXU, CMSQI, VMSQI, VNMMXU) can be taken in operation (Enabled) or out
of operation (Disabled).
The following general settings can be set for the Measurement function (CVMMXN).
PowMagFact: Magnitude factor to scale power calculations.
PowAngComp: Angle compensation for phase shift between measured I & V.
Mode: Selection of measured current and voltage. There are 9 different ways of
calculating monitored three-phase values depending on the available VT inputs
connected to the IED. See parameter group setting table.
k: Low pass filter coefficient for power measurement, V and I.
Section 17 1MRK 502 071-UUS A
Monitoring
680 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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