Application - ABB REC670 Applications Manual

Section 23
Basic IED functions
23.11.1
23.11.2
614

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 VBase/√3
If SMAI setting ConnectionType is Ph-Ph, at least two of the inputs GRPx_A,
GRPx_B and GRPx_C, 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: A-B to GRPxA, B-C to GRPxB, C-A to GRPxC. If SMAI setting
ConnectionType is Ph-N, all three inputs GRPx_A, GRPx_B and GRPx_C 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 GRPx_A, GRPx_B and
GRPx_C to the same voltage input as shown in figure
positive sequence voltage.
BLOCK
DFTSPFC
VAB
REVROT
PHASEA
^GRP1_A
TRM_40.CH7(U)
PHASEB
^GRP1_B
PHASEC
^GRP1_C
NEUTRAL
^GRP1_N
ANSI10000060 V1 EN-US
Figure 232: Connection example
SMAI1
SPFCOUT
G1AI3P
V3P*
BLOCK
G1AI1
BLKTRIP
G1AI2
G1AI4
G1N
1MRK 511 401-UUS A
GUID-B494B93C-B5AA-4FD6-8080-8611C34C2AD8 v5
232 to make SMAI calculate a
SAPTOF
TRIP SAPTOF(1)_TRIP
PICK UP
BLKDMAGN
FREQ
ANSI10000060-1-en.vsdx
Bay control REC670 2.2 ANSI
Application manual
SEMOD55744-4 v10