ABB Relion 670 Series RES670, Technical Manual

Page: 743 / 888

20.14.4 Operation principle
The Signal matrix for mA inputs (SMMI) function, see figure 280 , receives its inputs from
the real (hardware) mA inputs (the MIM boards) via the Signal Matrix Tool (SMT), and
makes them available to the rest of the configuration via its analog outputs, named AI1 to
AI6. The inputs, outputs, as well as the whole block, can be given user-defined names
which will be represented in SMT and ACT.
The outputs on SMMI can also be connected to the IEC61850 generic communication I/
O functions (MVGAPC) for further use of the mA signals elsewhere in a substation
system.
20.15 Signal matrix for analog inputs SMAI
20.15.1 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).
20.15.2 Function block
SMAI1
BLOCK
DFTSPFC
REVROT
^GRP1_A
^GRP1_B
^GRP1_C
^GRP1_N SPFCOUT
G1AI3P
G1AI1
G1AI2
G1AI3
G1AI4
G1N
ANSI14000027-1-en.vsd
ANSI14000027 V1 EN
Figure 281: SMAI1 function block
Figure 281 is an example of SMAI1:n in each of the three task time groups 1, 2 or 3 where:
• n=1–12 in task group 1
• n=13–24 in task group 2
• n=25–36 in task group 3
1MRK 511 365-UUS A
Section 20
Basic IED functions
Phasor measurement unit RES670 2.1 ANSI 737
Technical manual