ABB Relion 650 Series Applications Manual page 238

Section 15
Basic IED functions
15.9.3 Setting guidelines
The parameters for the signal matrix for analog inputs (SMAI) functions are set via the local HMI or
via the PCM600.
Every SMAI function block can receive four analog signals (three phases and one neutral value),
either voltage or current. SMAI outputs give information about every aspect of the 3ph analog
signals acquired (phase angle, RMS value, frequency and frequency derivates, and so on – 244
values in total). Besides the block "group name", the analog inputs type (voltage or current) and
the analog input names that can be set directly in ACT.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
DFTRefExtOut : Parameter valid only for function block SMAI_20_1:1 and SMAI_20_1:2 .
These 2 SMAI blocks can be used as reference blocks for other SMAI blocks; the setting is related
to the output signal SPFCOUT, and it defines the source for this output, when the adaptive
frequency tracking is used. The possible options are:
based on set system frequency): it is not used when the adaptive frequency tracking is needed.
DFTRefGrpn (where n is a number from 1 to 12): it define the SMAI block numbered n, within its
task, that is the reference for the adaptive frequency tracking. That reference SMAI shall be
voltage type, and shall be connected to a 3-phase voltage transformer which supply voltage in all
the needed operating conditions.
input DFTSPFC.
DFTReference : Reference DFT for the SMAI block.
These DFT reference block settings decide DFT reference for DFT calculations. The settings
InternalDFTRef will use fixed DFT reference based on set system frequency. The setting
DFTRefGrpn (where n is a number from 1 to 12) will use the SMAI block numbered n, within its task,
as reference for the adaptive frequency tracking. The setting
based on what is connected to input DFTSPFC.
The setting
N or Ph-Ph ). Depending on connection type setting the not connected Ph-N or Ph-Ph outputs will
be calculated.
Negation : Negation means rotation with 180
signal, it is possible to choose to negate only the phase signals
NegateN or both Negate3Ph+N .
MinValFreqMeas : The minimum value of the voltage for which the frequency is calculated,
expressed as percent of the voltage in the selected Global Base voltage group (n) (for each
instance 1<n<6).
232
ExternalDFTRef : the reference is based on what is connected to
ConnectionType : Connection type for that specific instance (n) of the SMAI (if it is Ph-
DFTRefExtOut and DFTReference shall be set to default value
Settings
InternalDFTRef if no VT inputs are available.
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InternalDFTRef (i.e. fixed DFT reference
ExternalDFTRef will use reference
0
of the vectors. If the user wants to negate the 3ph
Negate3Ph , only the neutral signal
1MRK 505 287-UUS B
GUID-C8D6C88B-87C6-44C1-804B-CF1594365EE6 v6
Busbar protection REB650
Application manual