Hitachi Relion 670 Series Commissioning Manual page 96

Section 11
Testing functionality by secondary injection
4. Increase the injected current in phase A slowly by more than the set Pick Up ICV. No signal 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 Pick Up ICV. Pickup 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 PU_37
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.
90
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1MRK506371-UUS Rev. M
GUID-57075848-249D-4F53-AB4D-A0DF2A04AC7C v2
GUID-27C0852A-008D-4107-8346-AB6A85043B7E v2
GUID-64C0F94F-5DC8-476C-B8B5-2B80F2B42692 v2
Line distance protection REL670
Commissioning manual