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used for directionality and is defined as Vref = -3V
0
e
—jRCADir
, that is -3V
0
inversely
rotated by the set characteristic angle
RCADir
.
RCADir
is normally set equal to 0 in a
high impedance grounded network with a neutral point resistor as the active current
component is appearing out on the faulted feeder only.
RCADir
is set equal to -90° in
an isolated network as all currents are mainly capacitive. The function operates when
3I
0
·cos φ gets larger than the set value.
-3V
0
=V
ref
3I
0
RCA = 0
°,
ROA = 90
°
= ang(3I
0
) - ang(3V
ref
)
3I
0
cos
en06000648_ansi.vsd
V
ref
ANSI06000648 V1 EN-US
Figure 71:
RCADir set to 0°
1MRK 511 408-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.2 ANSI
235
Technical manual
Содержание Relion RES670
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