ABB Relion Technical Manual page 233

1MRK 502 048-UUS A
Technical manual
V
ref
3I cos
0
ANSI06000649 V1 EN
Figure 101: RCADir set to -90°
For trip, both the residual current 3I
than the set levels: INCosPhiPU and VNRelPU.
When the function is activated binary output signals PICKUP and PUDIRIN are activated.
If the output signals are active after the set delay tDef the binary output signals TRIP and
TRDIRIN are activated. The trip from this sub-function has definite time delay.
There is a possibility to increase the operate level for currents where the angle φ is larger
than a set value as shown in figure 102. This is equivalent to blocking of the function if φ >
ROADir. This option is used to handle angle error for the instrument transformers.
RCA = -90°, ROA = 90°
3I
0
)
) – ang(V
= ang(3I
0 ref
-3V
0
en06000649_ansi.vsd
·cos φ and the release voltage 3V
0
Section 8
Current protection
, must be larger
0
227