Completing The Test; Through Fault Monitoring Ptrsthr; Verifying The Signals And Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.13.7.2

Completing the test

Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.13.8

Through fault monitoring PTRSTHR

Prepare the IED for verification of settings outlined in Section
settings".
11.13.8.1

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
are set correctly.
3. Ensure that the BLOCK and INHIBIT inputs are not activated.
4. Set
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
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
11. Bring the injected three-phase currents to the rated value.
Verifying the fault
1. Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for fault
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
8. Bring the injected three-phase currents to the rated value.
9.
Ensure that the relevant settings for fault cumulative
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
14. Compare the calculated value with the set
15. Bring the injected three-phase currents to the rated value.
246
tMin as 0 s to check the start level of through fault detection.
tMin setting to a particular value.
2
I t and cumulative I
© Copyright 2017 ABB. All rights reserved
"Preparing the IED to verify
tMin value.
2
t alarms
2
I t alarm such as MaxI2tW1 , MaxI2tW2 and
MaxI2tWx value.
2
I t alarm such as MaxI2tCmlW1 ,
2
I t value.
MaxI2tCmlWx value.
1MRK 504 165-UEN E
GUID-46EC57EA-375B-4DBD-BE18-914156083384 v1
Test mode setting to Off .
GUID-7AE60CB5-3CD5-4FE2-8D54-664AA78DD2DE v1
GUID-079BCF22-469C-42EA-B857-E28154EC13D9 v1
GUID-0295EF7C-217E-4400-B7C2-68C00A38ADF3 v1
GUID-148CA255-735B-42B3-9046-AD91B20DB261 v1
W1I> , W2I> and W3I>
GUID-D7BF8A0C-17CC-49E3-B101-AB719D0822CC v1
Transformer protection RET670
Commissioning manual