ABB REC670 Applications Manual page 294

Section 12
System protection and control
288
• 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-US
Figure 102: Required ACT configuration
Such overcurrent arrangement can be for example used to achieve the subsynchronous
resonance protection for turbo generators.
1MRK 511 401-UUS A
IEC13000179-1-en.vsd
Bay control REC670 2.2 ANSI
Application manual