ABB Relion 670 Series Technical Reference Manual page 578

Section 10
Multipurpose protection
572
Table 300: Typical current and voltage choices for directional feature
Set value for the Set value for the
parameter parameter
CurrentInput VoltageInput
PosSeq PosSeq
NegSeq -NegSeq
3ZeroSeq -3ZeroSeq
Phase1 Phase2-Phase3
Phase2 Phase3-Phase1
Phase3 Phase1-Phase2
Unbalance current or voltage measurement shall not be used when the directional
feature is enabled.
Two types of directional measurement principles are available, I & V and IcosPhi&V.
The first principle, referred to as "I & V" in the parameter setting tool, checks that:
• the magnitude of the measured current is bigger than the set pick-up level
• the phasor of the measured current is within the operating region (defined by the
relay operate angle, ROADir parameter setting; see figure 288).
Comment
Directional positive sequence overcurrent function is
RCADir is from -45° to -90°
obtained. Typical setting for
depending on the power
Directional negative sequence overcurrent function is
RCADir is from -45° to -90°
obtained. Typical setting for
depending on the power system voltage level (X/R ratio)
Directional zero sequence overcurrent function is
RCADir is from 0° to -90°
obtained. Typical setting for
depending on the power system grounding (that is, solidly
grounding, grounding via resistor)
Directional overcurrent function for the first phase is
RCADir is +30° or +45°
obtained. Typical setting for
Directional overcurrent function for the second phase is
RCADir is +30° or +45°
obtained. Typical setting for
Directional overcurrent function for the third phase is
RCADir is +30° or +45°
obtained. Typical setting for
1MRK505222-UUS C
Technical reference manual