This variant has the possibility of choice between definite time delay and inverse
time delay.
The inverse time delay is defined as:
0 0
inv
0 0
kSN (3I 3U cos (reference))
t
3I 3U cos (measured)
× × × j
=
× × j
EQUATION1942 V2 EN-US (Equation 30)
Directional residual current protection measuring 3I
0
and φ
SEMOD171963-48 v4
The function will operate if the residual current is larger than the set value and the
angle |φ = ang(3I
0
)-ang(U
ref
)| is within the sector RCADir ± ROADir
-3U
0
Operate area
3I
0
RCADir = 0º
ROADir = 80º
IEC06000652-3-en.vsd
IEC06000652 V3 EN-US
Figure 108: Example of characteristic
For trip, Residual current 3I
0
shall be larger than both INRel> and INDir>, and
residual voltage 3U
0
shall be larger than the UNRel>. In addition, the angle φ shall
be in the set area defined by ROADir and RCADir. 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 function indicates forward/reverse direction to the fault. Reverse direction is
defined as φ is within the angle sector: RCADir + 180° ± ROADir
This variant has definite time delay.
1MRK 506 382-UEN A Section 7
Current protection
Line distance protection REL650 2.2 IEC 227
Technical manual
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