Hitachi Relion 670 Series Applications Manual page 320

Section 15
Monitoring
S
P
Q
PF
ILAG
ILEAD
U
I
F
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 power falls below SZeroDb, the value for S is forced to zero.
15.1.5 Setting guidelines
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. Note that this function will only use IBase and UBase values.
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.
The following general settings can be set for the Phase current measurement (CMMXU):
IAmpCompY: Amplitude compensation to calibrate current measurements at Y% of Ir, where Y is
equal to 5, 30 or 100.
IAngCompY: Angle compensation to calibrate angle measurements at Y% of Ir, where Y is equal to
5, 30 or 100.
MeasurementType: This default setting is DFT, which gives fundamental frequency amplitude and
angle. It can be set as RMS, if true RMS value over one cycle is required.
The following general settings can be set for the Phase-phase voltage measurement (VMMXU):
314
Apparent power
Active power
Reactive power
Power factor
I lagging U
I leading U
System mean voltage, calculated according to selected mode
System mean current, calculated according to selected mode
Frequency
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 values, the
IED must be restarted in some way. Either manually or by changing some other
parameter at the same time.
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SEMOD54481-165 v15
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