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1MRK 506 355-UEN A
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Measure operating characteristics during constant current conditions. Keep the
measured current as close as possible to the rated value of its associated input
transformer, or lower. But ensure that it is higher than the set minimum operating
current.
Ensure that the maximum continuous current to the IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
To verify the settings the operating points according to figures
tested. See also tables
19
4
X +
(
1
XN
)
50% of RLdFw
IEC09000734 V3 EN
Figure 16:
Operating characteristic for phase selection function, forward
direction single-phase faults
Table 19:
Test points for phase-to-earth loop L3-E (Ohm/loop)
Test point
Reach
Value
1
X
[X1+XN]
R
0
2
X
0
R
RLdFw
R
RFFwPE
3
X
0.85·[X1+XN]
R
0.85·[X1+XN]·1/tan(60°)+RFFwPE
4
X
0.85·[X1+XN]
R
-0.85·[X1+XN]·
tan (AngNegRes-90°)
Table continues on next page
and
20
for information.
W
( /
loop
)
X
1
85%
5
ArgNegRes
2
7
6
RFFwPE
Section 10
16
and
17
should be
3
ArgLd
60°
W
( /
loop
R
ArgDir
IEC09000734-3-en.vsd
Comments
XN=(X
-X
)/3
0
1
When RLdFW < RFFwPE
When RLdFwPE > RFFwPE
R≈0.491·(X1+XN)+RFFwPE
Can be limited by RFFwPE
)
95
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