ABB Relion 670 Series Applications Manual page 572

Section 23
Basic IED functions
23.11.3 Setting guidelines
The parameters for the signal matrix for analog inputs (SMAI) functions are set via the local HMI or
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.
Application functions should be connected to a SMAI block with same task cycle as the application
function, except for e.g. measurement functions that run in slow cycle tasks.
DFTRefExtOut : Parameter valid only for function block SMAI1 .
Reference block for external output (SPFCOUT function output).
DFTReference : Reference DFT for the SMAI block use.
These DFT reference block settings decide DFT reference for DFT calculations. The setting
InternalDFTRef will use fixed DFT reference based on set system frequency. DFTRefGrp(n) will use
DFT reference from the selected group block, when own group is selected, an adaptive DFT
reference will be used based on calculated signal frequency from own group. The setting
ExternalDFTRef will use reference 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 as long as they are possible to calculate. E.g. at
calculated for use in symmetrical situations. If N component should be used respectively the phase
component during faults I
Negation : If the user wants to negate the 3ph signal, it is possible to choose to negate only the
phase signals
rotation with 180° of the vectors.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
MinValFreqMeas : The minimum value of the voltage for which the frequency is calculated,
expressed as percent of VBase (for each instance n).
Examples of adaptive frequency tracking
566
ConnectionType : Connection type for that specific instance (n) of the SMAI (if it is Ph-
/V must be connected to input 4.
N N
Negate3Ph , only the neutral signal NegateN or both Negate3Ph+N . negation means
Settings DFTRefExtOut and DFTReference shall be set to default value
InternalDFTRef if no VT inputs are available.
Even if the user sets the
MinValFreqMeas is still visible. However, using the current channel values as base
for frequency measurement is not recommendable for a number of reasons, not
last among them being the low level of currents that one can have in normal
operating conditions.
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Ph-Ph connection A, B and C will be
AnalogInputType of a SMAI block to " Current ", the
1MRK 511 401-UUS F
GUID-C8D6C88B-87C6-44C1-804B-CF1594365EE6 v8
Bay control REC670
Application manual