V=-3V0
Ipickup
Operate region
I=3Io
mta line
RCADir
ROADir
en05000252_anis.vsd
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).
1MRK505222-UUS C Section 10
Multipurpose protection
573
Technical reference manual
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