• 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 221: Required ACT configuration
Such overcurrent arrangement can be for example used to achieve the subsynchronous
resonance protection for turbo generators.
13.1.3 Setting guidelines
13.1.3.1 Setting example
A relay type used for generator subsynchronous resonance overcurrent protection
shall be replaced. The relay had inverse time operating characteristic as given with the
following formula:
EQUATION13000029 V1 EN
(Equation 257)
Where:
Section 13 1MRK 502 071-UEN -
System protection and control
466 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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