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1MRK 506 355-UEN A
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
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 L1 and note the operated value (start
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 operate level, and check the
time delay.
7.
Repeat points 3– 6 for phases L2 and L3.
8.
Inject symmetrical phase voltages equal to the rated voltage.
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 IUC<
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.
Section 10
89
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