10. Reverse the direction of the injected current and check that the step does not
operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above-described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
15.6.5.1 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
15.6.6 Sensitive directional residual overcurrent and power
protection SDEPSDE
Prepare the IED for verification of settings outlined in section
"Overview" and
section
"Preparing for test" in this chapter.
Figure
93 shows the principal connection of the test set during the test of the
sensitive directional residual overcurrent protection. Observe that the polarizing
voltage is equal to -3U
0
.
IEC09000021-2-en.vsd
IED test set
NI
IED
NI
L1U
L2U
L3U
NU
U1
U2
U3
NU
TRIP
IEC09000021 V2 EN
Figure 93: Principle connection of the test set
Values of the logical signals belonging to the sensitive directional residual
overcurrent protection are available on the local HMI under Main menu/Test/
1MRK 502 029-UEN A Section 15
Verifying settings by secondary injection
173
Installation and commissioning manual
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