Section 13 System protection and control
13.1 Multipurpose filter SMAIHPAC
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13.1.1 Identification
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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 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:
• Sub-synchronous resonance protection for turbo generators
• Sub-synchronous protection for wind turbines/wind farms
• Detection of sub-synchronous oscillation between HVDC links and
synchronous generators
• Super-synchronous protection
• Detection of presence of the geo-magnetic induced currents
1MRK 506 369-UEN B Section 13
System protection and control
Line distance protection REL670 2.2 IEC 581
Application manual
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