Section 13 System protection and control
13.1 Multipurpose filter SMAIHPAC
13.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Multipurpose filter SMAIHPAC - -
13.1.2 Application
The multi-purpose filter, function block with name SMAI HPAC, 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 506 369-UUS - Section 13
System protection and control
Line distance protection REL670 2.2 ANSI 617
Application manual
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