ABB RELION RET670, Commissioning Manual, Page: 189 / 328

be activated. Check under NS4PTOC function Service Values that correct I2
magnitude is measured by the function.
3. Set the injected negative sequence polarizing voltage slightly larger than the set
minimum polarizing voltage (default 5 % of Vn) and set the injection current to lag
the voltage by an angle equal to the set reference characteristic angle (
180° -
AngleRCA ) if the forward directional function is selected.
If reverse directional function is selected, set the injection current to lag the
polarizing voltage by an angle equal to RCA.
4. Increase the injected current and note the value at which the studied step of the
function trip.
5. Decrease the current slowly and note the reset value.
6. Block lower set steps when testing higher set steps according to the instructions that
follow.
7. Connect a trip output contact to a timer.
8. Set the injected current to 200% of the trip level of the tested step, 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 in order to test parameter
txmin .
9. Check that all trip and pickup contacts trip according to the configuration (signal
matrixes)
10. Reverse the direction of the injected current and check that the step does not trip.
11. Check that the protection does not trip when the polarizing voltage is zero.
12. Repeat the above-described tests for the higher set steps.
13. Finally, check that pickup and trip information is stored in the event menu.
11.5.5.1 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled . Restore connections and settings to their original values, if they were changed
for testing purposes.
11.5.6 Sensitive directional residual overcurrent and power protection
SDEPSDE (67N)
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings" .
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 183
Commissioning manual