Signal Matrix For Analog Inputs Smai - ABB RES670 Technical Manual

Section 22
Basic IED functions
22.9
22.9.1
22.9.2
786
The outputs on SMMI can also be connected to the IEC 61850 generic communication
I/O functions (MVGAPC) for further use of the mA signals elsewhere in a substation
system.

Signal matrix for analog inputs SMAI

Functionality
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).
Function block
SMAI1
BLOCK SPFCOUT
DFTSPFC G1AI3P
REVROT G1AI1
^GRP1_A G1AI2
^GRP1_B G1AI3
^GRP1_C G1AI4
^GRP1_N G1N
ANSI14000027-1-en.vsd
ANSI14000027 V1 EN-US
Figure 301: SMAI1 function block
Figure 301 is an example of SMAI1:n in each of the four task time groups 1, 2, 3 or 4
where:
• n=1–12 in task group 1
• n=13–24 in task group 2
• n=25–36 in task group 3
• n=37–48 in task group 4
The task time defines the execution repetition rate, and is 1, 3, 8 or 0.9 ms respectively
for the four task time groups.
1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
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