3.4.12 Signal matrix for analog inputs SMAI
3.4.12.1 Application
Signal matrix for analog inputs function (SMAI), also known as the preprocessor
function, processes the analog signals connected to it and gives information about all
aspects of the analog signals connected, like the RMS value, phase angle, frequency,
harmonic content, sequence components and so on. This information is then used by
the respective functions in ACT (for example protection, measurement or monitoring).
The SMAI function is used within PCM600 in direct relation with the Signal Matrix
tool or the Application Configuration tool.
3.4.12.2 Frequency values
The frequency functions includes a functionality based on level of positive sequence
voltage, IntBlockLevel, to validate if the frequency measurement is valid or not. If
positive sequence voltage is lower than IntBlockLevel the function is blocked.
IntBlockLevel, is set in % of VBase/√3
If SMAI setting ConnectionType is Ph-Ph at least two of the inputs GRPx_A, GRPx_B
and GRPx_C must be connected in order to calculate positive sequence voltage. If
SMAI setting ConnectionType is Ph-N, all three inputs GRPx_A, GRPx_B and
GRPx_C must be connected in order to calculate 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
21 to make SMAI calculating a
positive sequence voltage (that is input voltage/√3).
IEC10000060 V1 EN
Figure 21: Connection example
The above described scenario does not work if SMAI setting
ConnectionType is Ph-N. If only one phase-ground voltage is available,
the same type of connection can be used but the SMAI ConnectionType
Section 3 1MRK504116-UUS C
IED application
88
Application manual
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