ABB REG670 2.0 IEC, Руководство по вводу в эксплуатацию

Страница: 159 / 268

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 Ub) 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 operates.
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 operate level of the tested step, switch on
the current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the
operate current in order to test parameter
txmin .
9. Check that all trip and start contacts operate according to the configuration
(signal matrixes)
10. Reverse the direction of the injected current and check that the step does not
operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above-described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
12.5.5.1 Completing the test
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.
12.5.6 Sensitive directional residual overcurrent and power
protection SDEPSDE
Prepare the IED for verification of settings outlined in section "Requirements" and
section "Preparing for test" in this chapter.
1MRK502053-UEN B
Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC 153
Commissioning manual