ABB REG670 - Page 400

= =
o o
0 , 90RCADir ROADir
0
3I
j = -
0 ref
ang(3I ) ang(3U )
- =
0 ref
3U U
0
3I cos× j
IEC06000648-4-en.vsd
IEC06000648 V4 EN
Figure 176: RCADir set to 0°
IEC06000649_3_en.vsd
ref
U
= − =
 
90 , 90RCADir ROADir
0
3I
0
3 ⋅ ϕI cos
ϕ = −
0
(3 ) ( )
ref
ang I ang U
−
0
3U
IEC06000649 V3 EN
Figure 177: RCADir set to -90°
For trip, the operating quantity 3I
0
cos φ, the residual current 3I
0
, and the residual
voltage 3U
0
must be larger than the set levels : INCosPhi>, INRel> and UNRel>.
Refer to the simplified logical diagram in Figure
181.
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.
Section 8 1MRK502052-UEN B
Current protection
394
Technical manual