Completing The Test; Through Fault Monitoring Ptrsthr; Verifying The Signals And Settings - Hitachi RED670 Commissioning Manual

1MRK 505 378-UEN Rev. K
11.13.5.1

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.
11.13.6

Through fault monitoring PTRSTHR

Prepare the IED for verification of settings outlined in Section
11.13.6.1

Verifying the signals and settings

The voltage or current can be injected using a common test equipment.
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 W1I>, W2I> and W3I> are
set correctly.
3. Ensure that the BLOCK and INHIBIT inputs are not activated.
4. Set tMin as 0 s to check the start 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 tMin 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 tMin 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
MaxI2tW3 are 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 Off. Restore
connections and settings to their original values, if they were changed for testing purposes.
Line differential protection RED670
Commissioning manual
2 2
t and cumulative I t alarms
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Testing functionality by secondary injection
"Preparing the IED to verify
2
t alarm such as MaxI2tW1, MaxI2tW2 and
2
t alarm such as MaxI2tCmlW1,
2
t value.
Section 11
GUID-325F040B-BADC-4281-B965-9B7D6BFA3E15 v2
GUID-7AE60CB5-3CD5-4FE2-8D54-664AA78DD2DE v1
GUID-079BCF22-469C-42EA-B857-E28154EC13D9 v1
settings".
GUID-0295EF7C-217E-4400-B7C2-68C00A38ADF3 v1
GUID-148CA255-735B-42B3-9046-AD91B20DB261 v1
GUID-D7BF8A0C-17CC-49E3-B101-AB719D0822CC v1
GUID-8F01A787-4FDA-48BA-8045-5DC678C9410C v1
241