-3V
0
=V
ref
Trip area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)
Characteristic after
angle compensation
RCAcomp
ANSI06000651-2-en.vsd
RCADir = 0º
ANSI06000651 V2 EN-US
Figure 269: Explanation of RCAComp
Directional residual power protection measuring 3I
0
· 3V
0
· cos φ
SEMOD171963-32 v6
φ is defined as the angle between the residual current 3I
0
and the reference voltage (V
ref
= -3V
0
e
-
jRCA
) compensated with the set characteristic angle
RCADir
(|φ=ang(3I
0
)—ang(V
ref
)|). The function
operates when 3I
0
· 3V
0
· cos φ gets larger than the set value
SN>
. Refer to the simplified logical
diagram in Figure 271.
For trip, the residual power 3I
0
· 3V
0
· cos φ, the residual current 3I
0
and the release voltage 3V
0
,
shall be larger than the set levels (
SN_PU
,
INRelPU
and
VNRelPU
).
Trip from this function can be blocked from the binary input BLKTRDIR.
When the function picks up, binary output signals PICKUP and PUDIRIN are activated. If the output
signals PICKUP and PUDIRIN remain active for the set delay
tDef
or after the inverse time delay
(setting
TDSN
) the binary output signals TRIP and TRDIRIN get activated.
The function shall indicate forward/reverse direction to the fault. Reverse direction is defined as
3I
0
· 3V
0
·cos (φ + 180°) ³ the set value.
This variant has the possibility of choice between definite time delay and inverse time delay.
1MRK 502 066-UUS B Section 8
Current protection
513
Technical manual
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