Completing The Test - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
3 out of 3 currents for operation is chosen: Connect the symmetrical three-phase injection
If
current into phases A, B and C.
2. Connect the test set for the appropriate three-phase voltage injection to the IED phases A, B
and C. The protection shall be fed with a symmetrical three-phase voltage.
3. Block higher set stages when testing lower set stages by following the procedure described
below:
3.1.
3.2.
3.3.
4. If the test has been performed by injection of current in phase A, repeat the test, injecting
current into phases B and C with polarizing voltage connected to phases B, respectively C (
out of 3 currents for operation).
5. If the test has been performed by injection of current in phases AB, repeat the test, injecting
current into phases BC and CA with the appropriate phase angle of injected currents.
6. Connect a trip output contact to a timer.
7. Set the injected current to 200% of the trip level of the tested stage, switch on the current
and check the time delay.
For inverse time curves, check the trip time at a current equal to 110% of the trip current for
txMin .
8. Check that all trip and pickup contacts trip according to the configuration (signal matrixes).
9. Reverse the direction of the injected current and check that the protection does not trip.
2 out of 3 or 3 out of 3 currents for operation is chosen: Check that the function will not trip
10. If
with current in one phase only.
11. Repeat the above described tests for the higher set stages.
12. Check that pickup and trip information is stored in the event menu.
10.5.2.2

Completing the test

Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
10.5.3 Instantaneous residual overcurrent protection EFPIOC (50N)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
To verify the settings the following fault type should be tested:
• Phase-to-ground fault
Commissioning manual
Set the injected polarizing voltage slightly larger than the set minimum polarizing
voltage (default is 5% of
voltage by an angle of about 80° if forward directional function is selected.
If 1 out of 3 currents for operation is chosen: The voltage angle of phase A is the
reference.
2 out of 3 currents for operation is chosen: The voltage angle of phase A – the voltage
If
angle of B is the reference.
If 3 out of 3 currents for operation is chosen: The voltage angle of phase A is the
reference.
If reverse directional function is selected, set the injection current to lag the polarizing
voltage by an angle equal to 260° (equal to 80° + 180°).
Increase the injected current, note the trip value of the tested step of the function and
compare it to the set value.
Decrease the current slowly, note the reset value and compare it to the reset ratio 95%.
in this chapter.
VBase ) and set the injection current to lag the appropriate
Testing functionality by secondary injection
TestMode setting to Disabled .
"Requirements" and
Section 10
1
SEMOD56287-118 v4
SEMOD52967-3 v6
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