Name Type Default Description
AI4 REAL 0 SMT connected milliampere input
AI5 REAL 0 SMT connected milliampere input
AI6 REAL 0 SMT connected milliampere input
PID-3832-OUTPUTSIGNALS v4
Table 980: SMMI Output signals
Name Type Description
AI1 REAL Analog milliampere input 1
AI2 REAL Analog milliampere input 2
AI3 REAL Analog milliampere input 3
AI4 REAL Analog milliampere input 4
AI5 REAL Analog milliampere input 5
AI6 REAL Analog milliampere input 6
21.8.4 Operation principle
SEMOD55908-4 v5
The Signal matrix for mA inputs (SMMI) function, see figure 637, 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.
21.9 Signal matrix for analog inputs SMAI
SEMOD55751-1 v2
21.9.1 Functionality
SEMOD55744-4 v10
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).
1MRK 502 066-UUS B Section 21
Basic IED functions
1263
Technical manual
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