ABB Relion REQ650, Applications Manual

Page: 313 / 340

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 ), ( UBase ) and ( SBase ).
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:
InternalDFTRef (i.e. fixed DFT reference 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.
ExternalDFTRef : the reference is based on what
is connected to 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
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.
Negation : Negation means rotation with 180
0
of the vectors. 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 NeN .
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).
1MRK 505 291-UEN A
Section 15
Basic IED functions
307
Application manual