• 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).
The following figure shoes typical configuration connections required to utilize this filter
in conjunction with multi-purpose function as non-directional overcurrent protection.
IEC13000179 V1 EN
Figure 296: Required ACT configuration
Such overcurrent arrangement can be for example used to achieve the subsynchronous
resonance protection for turbo generators.
Section 13 1MRK 506 369-UUS -
System protection and control
618 Line distance protection REL670 2.2 ANSI
Application manual
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