Completing The Test; Self-Adaptive Differential Protection For Two-Winding Power Transformers Pstpdif; Preparing The Function For Testing - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
9. Decrease the injected phase-phase voltage L1-L2 and note the operated value (start
value) of the function.
10. Increase the voltage slowly and note the reset value.
11. Connect a trip output contact to a timer.
12. Reduce the injected voltage stepwise to 90 % of the operate level, and check the time
delay.
13. Repeat points 9 – 12 for phases L2-L3 and L3-L1.
Zero sequence overcurrent criteria
Procedure
1. Connect the test set for three phase voltage injection (L1, L2, L3) or residual voltage
injection (N) to the appropriate IED terminals. This is dependent on how the IED is fed
from the CT .
2. Increase the injected zero sequence current and note the operate value (start value) of
the studied step of the function.
3. Decrease the current slowly and note the reset value.
4. Connect a trip output contact to a timer.
5. Set the injected current to 200 % of the operate level of the tested stage, switch on the
current and check the time delay.
Low current criteria
Procedure
1. Connect the test set for three phase current injection to the appropriate IED terminals.
2. Inject a symmetrical three phase current larger than the set value
3. Decrease the injected current in phase L1 and note the operate value (start value) of the
studied step of the function.
4. Increase the current slowly and note the reset value.
5. Connect a trip output contact to a timer.
6. Decrease the injected current stepwise to 50 % of the operate level and check the time
delay.
7. Repeat steps 3 – 6 for phases L2 and L3.
11.3.4.2

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.
11.3.5 Self-adaptive differential protection for two-winding power
transformers PSTPDIF
11.3.5.1

Preparing the function for testing

Prepare the IED in general for verification of settings outlined in Section
verify settings.
100
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Preparing the IED to
Transformer protection RET670
Commissioning manual