Section 13 System protection and control
13.1 Multipurpose filter SMAIHPAC
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13.1.1
Identification
GUID-8224B870-3DAA-44BF-B790-6600F2AD7C5D v1
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Multipurpose filter SMAIHPAC - -
13.1.2 Application
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The multi-purpose filter, function block with name SMAI HP
AC, is arranged as a
three-phase filter. It has very much the same user interface (e.g. function block outputs)
as the standard pre-processing function block SMAI. However the main difference is
that it can be used to extract any frequency component from the input signal. For all
four analogue input signals into this filter (i.e. three phases and the residual quantity)
the input samples from the TRM module, which are coming at rate of 20 samples per
fundamental system cycle, are first stored. When enough samples are available in the
internal memory, the phasor values at set frequency defined by the setting parameter
SetFrequency are calculated. The following values are internally available for each of
the calculated phasors:
• Magnitude
• Phase angle
• Exact frequency of the extracted signal
The SMAI HPAC filter is always used in conjunction with some other protection
function (e.g. multi-purpose protection function or overcurrent function or over-voltage
function or over-power function). In this way many different protection applications
can be arranged. For example the following protection, monitoring or measurement
features can be realized:
1MRK 504 163-UUS A Section 13
System protection and control
Transformer protection RET670 2.2 ANSI 661
Application manual
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