V=-3V0
Ipickup
Operate region
I=3Io
mta line
RCADir
ROADir
en05000252_anis.vsd
IEC05000252-ANIS V1 EN
Figure 111:
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
).
1MRK 511 365-UUS A
Section 11
Multipurpose protection
Phasor measurement unit RES670 2.1 ANSI
337
Technical manual
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