ABB Relion 670 Series Applications Manual page 451

1MRK 511 401-UUS F
17.1.3 Zero clamping
Measuring functions CVMMXN, CMMXU, VMMXU and VNMMXU have no interconnections regarding
any settings or parameters.
Zero clampings are also handled entirely by
signal. For example, zero clamping of U12 is handled by
is handled by
Example of CVMMXN operation
Outputs seen on the local HMI under Main menu/Measurements/Monitoring/
Servicevalues(P_Q)/CVMMXN(P_Q):
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
forced to zero.
• When system current falls below
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
zero.
17.1.4 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 value.
Operation : Disabled / Enabled . Every function instance (CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,
VNMMXU) can be taken in operation (
Bay control REC670
Application manual
IL1ZeroDb in CMMXU, and so on.
Apparent three-phase power
Active three-phase power
Reactive three-phase 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
IGenZeroDB , values for S, P, Q, PF, ILAG, ILEAD, U and F are
Enabled ) or out of operation ( Disabled ).
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ZeroDb separately for each function's every output
UL12ZeroDb in VMMXU, zero clamping of I1
UGenZeroDB , values for S, P, Q, PF, ILAG, ILEAD, U and F are
SZeroDb , the value for S is forced to
Section 17
Monitoring
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SEMOD54481-165 v14
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