ABB RES670 Technical Manual page 347

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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 trip angle, ROADir parameter setting; see figure 114).
RCADir
Ipickup
ROADir
Operate region
IEC05000252-ANIS V1 EN-US
Figure 114: 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 trip angle, ROADir parameter setting; see
figure 114).
V=-3V0
I=3Io
mta line
en05000252_anis.vsd
Section 11
Multipurpose protection
341