Signal Matrix For Analog Inputs Smai - ABB RET650 Applications Manual

1MRK 504 169-UEN A
18.10
18.10.1
18.10.2
Transformer protection RET650 2.2 IEC
Application manual

Signal matrix for analog inputs SMAI

Application
Signal matrix for analog inputs (SMAI), also known as the preprocessor function
block, analyses the connected four analog signals (three phases and neutral) and
calculates all relevant information from them like the phasor magnitude, phase
angle, frequency, true RMS value, harmonics, sequence components and so on.
This information is then used by the respective functions connected to this SMAI
block in ACT (for example protection, measurement or monitoring functions).
Frequency values
The SMAI function includes a functionality based on the level of positive sequence
voltage, MinValFreqMeas, to validate if the frequency measurement is valid or not.
If the positive sequence voltage is lower than MinValFreqMeas, the function
freezes the frequency output value for 500 ms and after that the frequency output is
set to the nominal value. A signal is available for the SMAI function to prevent
operation due to non-valid frequency values. MinValFreqMeas is set as % of
UBase/√3
If SMAI setting ConnectionType is Ph-Ph, at least two of the inputs GRPxL1,
GRPxL2 and GRPxL3, where 1≤x≤12, must be connected in order to calculate the
positive sequence voltage. Note that phase to phase inputs shall always be
connected as follows: L1-L2 to GRPxL1, L2-L3 to GRPxL2, L3-L1 to GRPxL3. If
SMAI setting ConnectionType is Ph-N, all three inputs GRPxL1, GRPxL2 and
GRPxL3 must be connected in order to calculate the positive sequence voltage.
If only one phase-phase voltage is available and SMAI setting ConnectionType is
Ph-Ph, the user is advised to connect two (not three) of the inputs GRPxL1,
GRPxL2 and GRPxL3 to the same voltage input as shown in figure
SMAI calculate a positive sequence voltage.
BLOCK
DFTSPFC
UL1L2
REVROT
PHASEL1
^GRP1L1
TRM_40.CH7(U)
PHASEL2
^GRP1L2
PHASEL3
^GRP1L3
NEUTRAL
^GRP1N
IEC10000060 V3 EN-US
Figure 124: Connection example
SMAI1
SPFCOUT
G1AI3P
U3P*
BLOCK
G1AI1
BLKTRIP
G1AI2
G1AI4
G1N
Section 18
Basic IED functions
SEMOD55751-1 v2
SEMOD55744-4 v10
GUID-B494B93C-B5AA-4FD6-8080-8611C34C2AD8 v5
124 to make
SAPTOF
TRIP SAPTOF(1)_TRIP
START
BLKDMAGN
FREQ
EC10000060-3-en.vsdx
347