Setting Guidelines - Hitachi Relion 670 Series Applications Manual

Section 16
Monitoring
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, 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.
16.1.5

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, VBase and
SBase. Note that this function will only use IBase .
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.
VMagCompY: Magnitude compensation to calibrate voltage measurements at Y% of Vn, where Y is
equal to 5, 30 or 100.
IMagCompY: Magnitude compensation to calibrate current measurements at Y% of In, where Y is equal
to 5, 30 or 100.
232
I leading U
System mean voltage, calculated according to selected mode
System mean current, calculated according to selected mode
Frequency
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1MRK511407-UUS Rev. N
SEMOD54481-165 v15
Phasor measurement unit RES670
Application manual