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Section 11
Testing functionality by secondary injection
Prepare the IED for verification of settings outlined in section 1 "Overview" and section 2 "Preparing
for test" in this chapter.
Current variation local criteria
Procedure
1.
Set Operation to On.
2.
Connect the test set for three phase current injection to the appropriate IED terminals.
3.
Inject symmetrical phase currents equal to half the rated current
4.
Increase the injected current in phase L1 slowly in steps less than the set ICV>, to a value
higher than set ICV>. No signal shall be activated.
5.
Decrease the injected current in phase L1 to half the rated current.
6.
Increase the injected current in phase L1 in a step by more than the set ICV>. Start 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 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
98
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1MRK 505 378-UEN Rev. K
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Commissioning manual
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