Wait until the thermal memory is emptied, set the cooling time constant
according to the setting plan and check another point on the inverse time
curve injecting a voltage 1.3 · V/Hz>.
14. Finally check that
START and TRIP information is stored in the event menu.
11.6.4.2 Completing the test
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Continue to test another function or end the test by changing the TESTMODE
setting to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
11.6.5 Voltage differential protection VDCPTOV
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Prepare the IED for verification of settings as outlined in section
"Requirements"
and section "Preparing for test" in this chapter.
11.6.5.1
Check of undervoltage levels
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This test is relevant if the setting BlkDiffAtULow = Yes.
Check of U1Low
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Procedure
1. Connect voltages to the IED according to valid connection diagram and figure
46.
2. Apply voltage higher than the highest set value of UDT
rip, U1Low and
U2Low to the U1 three-phase inputs and to one phase of the U2 inputs
according to figure
46.
The voltage differential ST
ART signal is set.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 201
Commissioning manual
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