•
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.
10.1.4
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).
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.
UGenZeroDb
: Minimum level of voltage in % of UBase, used as indication of zero
voltage (zero point clamping). If measured value is below
UGenZeroDb
calculated
S, P, Q and PF will be zero.
IGenZeroDb
: Minimum level of current in % of
IBase
, used as indication of zero
current (zero point clamping). If measured value is below
IGenZeroDb
calculated
S, P, Q and PF will be zero.
UAmpCompY
: Amplitude compensation to calibrate voltage measurements at Y%
of Ur, where Y is equal to 5, 30 or 100.
IAmpCompY
: Amplitude compensation to calibrate current measurements at Y% of
Ir, where Y is equal to 5, 30 or 100.
Section 10
1MRK 511 423-UEN A
Monitoring
196
Bay control REC650 2.2 IEC
Application manual
