9.
Reverse the direction of the injected current and check that the protection does not
operate.
10. If
2 out of 3 or 3 out of 3 currents for operation is chosen: Check that the function will not
operate with current in one phase only.
11.
Repeat the above described tests for the higher set stages.
12.
Check that start and trip information is stored in the event menu.
12.5.2.2
Completing the test
SEMOD56287-118 v4
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.5.3
Instantaneous residual overcurrent protection EFPIOC
SEMOD52967-3 v6
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
To verify the settings the following fault type should be tested:
•
Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source used for the
test of the IED, does not exceed four times the rated current value of the IED.
12.5.3.1
Measuring the operate limit of set values
SEMOD52967-11 v8
1.
Inject a phase current into the IED with an initial value below that of the setting.
2.
Increase the injected current in the Ln or in the neutral (summated current input) phase
until the TRIP signal appears.
3.
Switch the fault current off.
Observe to not exceed the maximum permitted overloading of the current circuits in the
IED.
4.
Compare the measured operating current with the set value.
12.5.3.2
Completing the test
SEMOD52967-24 v5
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.5.4
Four step residual overcurrent protection, (Zero sequence or
negative sequence directionality) EF4PTOC
SEMOD53296-3 v8
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
12.5.4.1
Four step directional earth fault protection
SEMOD53296-208 v6
1.
Connect the test set for single current injection to the appropriate IED terminals.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
156
Commissioning manual
