ABB RES670 Technical Manual page 244

Section 8
Current protection
238
Instrument
transformer
angle error
ANSI06000651 V2 EN-US
Figure 74: Explanation of RCAComp
Directional residual power protection measuring 3I
φ is defined as the angle between the residual current 3I
-jRCA
(V = -3V e ) compensated with the set characteristic angle RCADir (|φ=ang(3I
ref 0
—ang(V )|). The function operates when 3I
ref
value SN>. Refer to the simplified logical diagram in Figure 76.
For trip, the residual power 3I
voltage 3V , shall be larger than the set levels (SN_PU, INRelPU and VNRelPU).
0
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
RCADir = 0º
Trip area

RCAcomp
Characteristic after
angle compensation
3I (to prot)
3I (prim)
0
0
ANSI06000651-2-en.vsd
· 3V
0
· 3V · cos φ, the residual current 3I
0 0
1MRK 511 408-UUS A
-3V =V
0 ref
· 3V · cos φ
0 0
and the reference voltage
0
· cos φ gets larger than the set
0
and the release
0
Phasor measurement unit RES670 2.2 ANSI
Technical manual
SEMOD171963-32 v6
)
0