Table 300:
Typical current and voltage choices for directional feature
Set value for the
parameter
CurrentInput
Set value for the
parameter
VoltageInput
Comment
PosSeq
PosSeq
Directional positive sequence overcurrent function is
obtained. Typical setting for
RCADir is from -45° to -90°
depending on the power
NegSeq
-NegSeq
Directional negative sequence overcurrent function is
obtained. Typical setting for
RCADir is from -45° to -90°
depending on the power system voltage level (X/R ratio)
3ZeroSeq
-3ZeroSeq
Directional zero sequence overcurrent function is
obtained. Typical setting for
RCADir is from 0° to -90°
depending on the power system grounding (that is, solidly
grounding, grounding via resistor)
Phase1
Phase2-Phase3
Directional overcurrent function for the first phase is
obtained. Typical setting for
RCADir is +30° or +45°
Phase2
Phase3-Phase1
Directional overcurrent function for the second phase is
obtained. Typical setting for
RCADir is +30° or +45°
Phase3
Phase1-Phase2
Directional overcurrent function for the third phase is
obtained. Typical setting for
RCADir is +30° or +45°
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
).
Section 10
1MRK505222-UUS C
Multipurpose protection
572
Technical reference manual
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