ABB Relion REC670 - Section 11 System protection and control; 11.1 Multipurpose filter SMAIHPAC

Section 11 System protection and control
11.1 Multipurpose filter SMAIHPAC
GUID-6B541154-D56B-452F-B143-4C2A1B2D3A1F v1
11.1.1 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 - -
11.1.2 Application
GUID-A1F20DD8-571E-42C3-84F3-C557EC352ED0 v1
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
• Overcurrent or overvoltage protection at specific frequency harmonic, sub-harmonic,
inter-harmonic etc.
• Presence of special railway frequencies (e.g. 16.7Hz or 25Hz) in the three-phase power
system
• Sensitive reverse power protection
• Stator or rotor earth fault protection for special injection frequencies (e.g. 25Hz)
• etc.
The filter output can also be connected to the measurement function blocks such as CVMMXN
(Measurements), CMMXU (Phase current measurement), VMMXU (Phase-phase voltage
measurement), etc. in order to report the extracted phasor values to the supervisory system
(e.g. MicroSCADA).
1MRK 511 358-UEN A Section 11
System protection and control
213
Application manual