Ensure that the maximum continuous current of an 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 54 and 55 should be
tested. See also tables 22 and 23 for information.
ArgDir
R
X
RFFwPE
1
3
)1( XNX +
5
2
4
ArgNegRes
85%
ArgLd
50% of RLdFw
6
IEC09000734-2-en.vsd
)/( phaseW
)/( phaseW
7
IEC09000734 V2 EN
Figure 54: Operating characteristic for phase selection function, forward
direction single-phase faults
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
122
Installation and commissioning manual
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