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 (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.
13.5.5.1 Completing the test
SEMOD53296-122 v4
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.
13.5.6 Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
SEMOD175060-3 v7
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 193
Commissioning manual
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