and then inject a current IL1 that is 200% higher than the set
operation level. Then slowly decrease the voltage in two
phases simultaneously, until the STUV and ST
ART signals
appear.
15. Increase slowly the applied voltages of the previous two phases and note the
reset value.
16. Check that the trip output of the relay is connected to the input channel of the
test in order to stop the injection and measure the trip time.
17.
Inject symmetric three-phase voltages at their rated value and check that the
STUV and START signals reset as well as the trip signals of the function
block (TRIP and TRUV).
18. Instantaneously decrease the voltage in two phases simultaneously to a value
20% lower than the set operate value (take into account the previous note if
VRPVOC is configured in ACT with the undervoltage seal-in feature).
19. Measure the definite time delay for the TRUV and TRIP signals and compare
it with the set value tDef_UV.
20. Check that start and operate information is stored in the event menu.
11.5.13.2 Completing the test
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2
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 Voltage protection
SEMOD53540-1 v1
11.6.1 Two step undervoltage protection UV2PTUV
M13796-2 v6
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
11.6.1.1 Verifying the settings
M13796-9 v3
Verification of start value and time delay to
operate for Step 1
M13796-29 v10
1. Check that the IED settings are appropriate, especially the START value, the
definite time delay and the 1 out of 3 operation mode.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the START signal
appears.
4. Note the operate value and compare it with the set value.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
196 Line differential protection RED670 2.2 IEC
Commissioning manual
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