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
16 and 17 should be
tested. See also tables 19 and 20 for information.
5
2
4
ArgNegRes
85%
ArgLd
50% of RLdFw
6
IEC09000734-3-en.vsd
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 Comments
1 X [X1+XN] XN=(X
0
-X
1
)/3
R 0
2 X 0
R RLdFw When RLdFW < RFFwPE
R RFFwPE When RLdFwPE > RFFwPE
3 X 0.85·[X1+XN] R≈0.491·(X1+XN)+RFFwPE
R 0.85·[X1+XN]·1/tan(60°)+RFFwPE
4 X 0.85·[X1+XN] Can be limited by RFFwPE
R -0.85·[X1+XN]·
tan (AngNegRes-90°)
Table continues on next page
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 95
Commissioning manual
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