ABB RET670 Commissioning Manual page 88

Section 10
Testing functionality by secondary injection
4. Increase the injected current in phase A slowly by more than the set
shall be activated.
5. Decrease the injected current in phase A to half the rated current.
6. Increase the injected current in phase A in a step by more than the set
shall be activated.
Undervoltage criteria
Procedure
1. Connect the test set for three phase current injection and three phase voltage to the
appropriate IED terminals.
2. Inject symmetrical phase voltages equal to the rated voltage.
3. Decrease the injected voltage in phase A and note the operated value (pickup value) of the
function.
4. Increase the voltage slowly and note the reset value.
5. Connect a trip output contact to a timer.
6. Reduce the injected voltage stepwise to 90 % of the trip level, and check the time delay.
7. Repeat points 3– 6 for phases B and C.
8. Inject symmetrical phase voltages equal to the rated voltage.
9. Decrease the injected phase-phase voltage A-B 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 trip level, and check the time delay.
13. Repeat points 9 – 12 for phases B-C and C-A.
Zero sequence overcurrent criteria
Procedure
1. Connect the test set for three phase voltage injection (A, B, C) 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 trip value (pickup 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 trip 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 A and note the trip value (pickup value) of the studied
step of the function.
4. Increase the current slowly and note the reset value.
82
1MRK 504 154-UUS B
Pick Up ICV . No signal
Pick Up ICV . Pickup
GUID-57075848-249D-4F53-AB4D-A0DF2A04AC7C v2
GUID-27C0852A-008D-4107-8346-AB6A85043B7E v2
GUID-64C0F94F-5DC8-476C-B8B5-2B80F2B42692 v2
PU_37
Commissioning manual