Example how CVMMXN is operating:
The following outputs can be observed on the local HMI under Monitoring/Servicevalues/
SRV1
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
The settings for this function is found under Setting/General setting/Monitoring/Service
values/SRV1
It can be seen that:
• When system voltage falls below
UGenZeroDB
, 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 below
IGenZeroDB
, 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, the
value shown on the local HMI is forced to zero. For example, if apparent three-phase
power falls below
SZeroDb
the value for S on the local HMI is forced to zero.
16.1.4 Setting guidelines
SEMOD54481-165 v12
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
).
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 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, U and I.
1MRK 511 358-UEN A Section 16
Monitoring
377
Application manual
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