V=-3V0
Ipickup
Operate region
I=3Io
mta line
RCADir
ROADir
en05000252_anis.vsd
IEC05000252-ANIS V1 EN-US
Figure 371: 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
V=-3V0
Operate region
RCADir
ROADir
Ipickup
I=3Io
mta line
F
en05000253_ansi.vsd
ANSI05000253 V1 EN-US
Figure 372: CVGAPC, IcosPhi&V directional operating principle
where:
RCADir is 75°
ROADir is 50°
Section 11
1MRK 502 066-UUS B
Multipurpose protection
702
Technical manual
Содержание Relion 670 series
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