(SAPFRC) due to that all other information except frequency and
positive sequence voltage might be wrongly calculated.
24.11.3 Setting guidelines
GUID-C8D6C88B-87C6-44C1-804B-CF1594365EE6 v8
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 ConnectionType: Connection type for that specific instance (n) of the
SMAI (if it is Ph-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 Ph-Ph connection L1, L2 and L3 will be calculated for use in
symmetrical situations. If N component should be used respectively the phase
component during faults I
N
/U
N
must be connected to input 4.
Negation: If the user wants to negate the 3ph signal, it is possible to choose to
negate only the phase signals Negate3Ph, only the neutral signal NegateN or both
Negate3Ph+N. negation means rotation with 180° of the vectors.
GlobalBaseSel: Selects the global base value group used by the function to define
(IBase), (UBase) and (SBase).
MinValFreqMeas: The minimum value of the voltage for which the frequency is
calculated, expressed as percent of UBase (for each instance n).
1MRK 506 369-UEN B Section 24
Basic IED functions
Line distance protection REL670 2.2 IEC 863
Application manual
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