ABB RES670 Applications Manual page 131

1MRK 511 407-UEN C
Phasor measurement unit RES670 2.2 IEC
Application manual
The parameters for the directional phase overcurrent protection, four steps
OC4PTOC are set via the local HMI or PCM600.
The following settings can be done for OC4PTOC.
Common base IED values for the primary current (IBase), primary voltage (UBase)
and primary power (SBase) are set in global base values for settings function
GBASVAL.
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
MeasType: Selection of discrete Fourier filtered (DFT) or true RMS filtered (RMS)
signals. RMS is used when the harmonic contents are to be considered, for example
in applications with shunt capacitors.
Operation: The protection can be set to On or Off.
AngleRCA: Protection characteristic angle set in degrees. If the angle of the fault
loop current has the angle RCA, the direction to the fault is forward.
AngleROA: Angle value, given in degrees, to define the angle sector of the
directional function, shown in Figure 50.
StartPhSel: Number of phases, with high current, required for operation. The
setting possibilities are: 1 out of 3, 2 out of 3 and 3 out of 3. The default setting is 1
out of 3.
IMinOpPhSel: Minimum current setting level for releasing the directional start
signals in % of IB. This setting should be less than the lowest step setting. The
default setting is 7% of IB.
2ndHarmStab: Operate level of 2nd harmonic current restrain set in % of the
fundamental current. The setting range is 5 - 100% in steps of 1%. The default
setting is 20%.
Section 8
Current protection
125