ABB Relion 650 Series Technical Manual page 104

Section 6
Multipurpose protection
98
Set value for the Set value for the
parameter parameter
CurrentInput VoltageInput
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 & U and
IcosPhi&U. The first principle, referred to as "I & U" 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 34).
Ipickup ROADir
Operate region
IEC05000252 V2 EN-US
Figure 34: I & U directional operating principle for CVGAPC function
where:
RCADir is 75°
ROADir is 50°
The second principle, referred to as "IcosPhi&U" in the parameter setting tool,
checks that:
Comment
Directional overcurrent function for the first phase is
obtained. Typical setting for
Directional overcurrent function for the second phase
is obtained. Typical setting for
+45°
Directional overcurrent function for the third phase is
obtained. Typical setting for
U=-3U0
RCADir
I=3Io
MTA line
IEC05000252-2-en.vsd
1MRK 511 424-UEN B
RCADir is +30° or +45°
RCADir is +30° or
RCADir is +30° or +45°
Bay control REC650 2.2 IEC
Technical manual