ABB RED670 Commissioning Manual page 260

Section 11
Testing functionality by secondary injection
Verifying the through fault detection
1. Supply the IED with three-phase current at rated value.
2. Ensure that the relevant settings for through fault detection such as W1 I pickup, W2 I pickup and
W3 I pickup are set correctly.
3. Ensure that the BLOCK and INHIBIT inputs are not activated.
4. Set t_MinTripDelay as 0 s to check the pickup level of through fault detection.
5. Slowly increase any phase current of any winding until ALARM signal appears.
6. Compare the injected phase current value with the set threshold limit value.
7. Bring the injected three-phase currents at the rated value.
8. Change the t_MinTripDelay setting to a particular value.
9. Slowly increase any phase current of any winding to the threshold limit and wait until the ALARM
signal appears.
10. Compare the wait time with the set t_MinTripDelay value.
11. Bring the injected three-phase currents to the rated value.
Verifying the fault I
1. Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for fault I
set correctly.
3. Ensure that the BLOCK and INHIBIT inputs are not activated.
4. Slowly increase any phase current of any winding until ALARM signal appears.
5. Continue to inject the same level of current until the I2TALM signal appears.
6. Compute the time between the ALARM signal raise to I2TALM signal raise and multiply with the
squared injected current.
7. Compare the calculated value with the set MaxI2tWx value.
8. Bring the injected three-phase currents to the rated value.
9.
Ensure that the relevant settings for fault cumulative I
MaxI2tCmlW2 and MaxI2tCmlW3 are set correctly.
10. Slowly increase any phase current of any winding to the threshold limit and wait until the ALARM
signal appears.
11. Continue to inject the same level of current until the CMLI2TALM signal appears.
12. Compute the time between the ALARM signal raise to CMLI2TALM signal raise and multiply with
the squared injected current.
13.
Add the calculated value with previously calculated I
14. Compare the calculated value with the set MaxI2tCmlWx value.
15. Bring the injected three-phase currents to the rated value.
11.13.6.2 Completing the test
Continue to test another function or end the test by changing the TestMode setting to Disabled. Restore
connections and settings to their original values, if they were changed for testing purposes.
254
2 2
t and cumulative I t alarms
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2
t alarm such as MaxI2tW1, MaxI2tW2 and MaxI2tW3 are
2
t alarm such as MaxI2tCmlW1,
2
t value.
1MRK 505 378-UUS Rev. J
GUID-148CA255-735B-42B3-9046-AD91B20DB261 v1
GUID-D7BF8A0C-17CC-49E3-B101-AB719D0822CC v1
GUID-8F01A787-4FDA-48BA-8045-5DC678C9410C v1
Line differential protection RED670
Commissioning manual