S Apparent three-phase power
P Active three-phase power
Q Reactive three-phase power
PF Power factor
ILAG I lagging U
ILEAD I leading U
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, U and
F are forced to zero.
• When system current falls below IGenZeroDB, values for S, P, Q, PF, 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.
15.1.4 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, UBase and SBase as applicable.
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):
k: Low pass filter coefficient for power measurement.
Parameters IBase, Ubase and SBase have been implemented as a
settings instead of a parameters, which means that if the values of
the parameters are changed there will be no restart of the
application. As restart is required to activate new parameters
Section 15 1MRK 506 375-UEN A
Monitoring
382 Railway application RER670 2.2 IEC
Application manual
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