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.
3.15.1.3 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.
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.
VGenZeroDb: Minimum level of voltage in % of VBase used as indication of zero
voltage (zero point clamping). If measured value is below VGenZeroDb 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.
1MRK504116-UUS C Section 3
IED application
751
Application manual
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