ABB Relion 670 Series Technical Reference Manual page 579

1MRK505222-UUS C
Technical reference manual
RCADir
Ipickup
ROADir
Operate region
IEC05000252-ANIS V1 EN
Figure 288: I & V directional operating principle for CVGAPC function
where:
RCADir is -75°
ROADir is 50°
The second principle, referred to as "IcosPhi&V" in the parameter setting tool, checks
that:
• that the product I·cos(Φ) is bigger than the set pick-up level, where Φ is angle
between the current phasor and the mta line
• that the phasor of the measured current is within the operating region (defined by
the I·cos(Φ) straight line and the relay operate angle, ROADir parameter setting;
see figure 288).
V=-3V0
I=3Io
mta line
en05000252_anis.vsd
Section 10
Multipurpose protection
573