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:
• 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 502 071-UEN - Section 13
System protection and control
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 465
Application manual
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