ABB REL650 Technical Manual page 230

Section 7
Current protection
224
IEC06000648 V4 EN-US
Figure 104: RCADir set to 0°
U
ref
3 ⋅ I cos ϕ
0
IEC06000649 V3 EN-US
Figure 105: RCADir set to -90°
For trip, the operating quantity 3I
voltage 3U must be larger than the set levels : INCosPhi>, INRel> and UNRel>.
0
Refer to the simplified logical diagram in Figure 109.
Trip from this function can be blocked from the binary input BLKTRDIR.
When the function picks up, binary output signals START and STDIRIN are
activated. If the output signals START and STDIRIN remain active for the set
delay tDef the binary output signals TRIP and TRDIRIN get activated. The trip
from this sub-function has definite time delay.
o
=
RCADir 0 , ROADir
3I
0
j = -
ang(3I ) ang(3U )
0 ref
-
3U
× j
3I cos
0
IEC06000648-4-en.vsd

RCADir = − 90 , ROADir = 90
3I
0
ϕ = ang I (3 ) − ang U ( )
0 ref
− 3U
0
IEC06000649_3_en.vsd
cos φ, the residual current 3I
0
1MRK 506 382-UEN A
o
=
90
=
U
0 ref

, and the residual
0
Line distance protection REL650 2.2 IEC
Technical manual