1. Check that the IED settings are appropriate, for example the StartFrequency, UMin , and the
tDelay.
2. Supply the IED with three-phase voltages at rated values.
3. Slowly decrease the magnitude of the applied voltage, until the BLKDMAGN signal appears.
4. Note the voltage magnitude value and compare it with the set value UMin.
5. Slowly decrease the frequency of the applied voltage, to a value below StartFrequency.
6. Check that the START signal does not appear.
7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does not appear.
11.7.1.2 Completing the test
M16289-57 v5
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.7.2 Overfrequency protection SAPTOF
M16290-2 v7
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to verify settings".
11.7.2.1 Verifying the settings
M16290-12 v2
Verification of START value and time delay to operate
M16290-14 v6
1. Check that the IED settings are appropriate, for example the start value and the time delay.
2. Supply the IED with three-phase voltages at their rated values and initial frequency.
3. Slowly increase the frequency of the applied voltage with a 40 mHz step, applying it for a
period that is 10% longer than tDelay.
4. Note the operate value and compare it with the set value.
5. Decrease the frequency to rated operating conditions.
6. Check that the START signal resets.
7. Set the frequency to 20 mHz under the operate value.
8. Increase the frequency with a 40 mHz step, applying it for a period that is 10% longer than
tDelay.
9. Measure the time delay for the TRIP signal, and compare it with the set value. Note that the
measured time consists of the set value for time delay plus minimum operate time of the start
function (80 - 90 ms).
Extended testing
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1. The test above can be repeated to check the time to reset.
Verification of the low voltage magnitude blocking
M16290-34 v6
1. Check that the settings in the IED are appropriate, for example the StartFrequency and the
tDelay.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the magnitude of the applied voltage, until the BLKDMAGN signal appears.
4. Note the voltage magnitude value and compare it with the set value.
5. Slowly increase the frequency of the applied voltage, to a value above StartFrequency.
6. Check that the START signal does not appear.
7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does not appear.
1MRK 505 378-UEN Rev. K Section 11
Testing functionality by secondary injection
Line differential protection RED670 193
Commissioning manual
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