ABB RET670 Applications Manual page 96

Section 3
IED application
90
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: 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.
VBase: Base voltage setting (for each instance x).
MinValFreqMeas: The minimum value of the voltage for which the frequency is
calculated, expressed as percent of VBase (for each instance n).
Settings DFTRefExtOut and DFTReference shall be set to default value
InternalDFTRef if no VT inputs are available.
Even if the user sets the AnalogInputType of a SMAI block to
"Current", 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.
Examples of adaptive frequency tracking
1MRK504116-UUS C
Application manual