ABB Relion 670 Series Commissioning Manual page 168

Section 11
Testing functionality by secondary injection
1. Connect the test set for injection of three-phase currents and voltages to the appropriate CT
and VT inputs of the IED.
2. Inject pure negative sequence current, that is, phase currents with exactly same magnitude,
reversed sequence and exactly 120° phase displaced into the IED with an initial value below
negative sequence current pickup level. No output signals should 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 (
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
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
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 as outlined in section
section "Preparing for test"
162
txmin .
in this chapter.
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180° - AngleRCA ) if the forward
TESTMODE setting to Disabled .
"Requirements" and
Line distance protection REL670
Commissioning manual
1MRK 506 371-UUS E
SEMOD53296-122 v4
SEMOD175060-3 v7