ABB REG670 2.0 IEC, Commissioning Manual

Page: 115 / 268

4. Decrease the current slowly from operate value and note the reset value.
5. Connect the timer and set the current to ten times the value of the IDMin setting.
6. Switch on the current and note the operate time.
7. Connect the test set to terminal L1 and neutral of the three-phase current input
configured to REFPDIF. Also inject a current higher than half the
Idmin setting
in the neutral-to-earth circuit with the same phase angle and with polarity
corresponding to an internal fault.
8. Increase the current injected in L1, and note the operate value. Decrease the
current slowly and note the reset value.
9. Inject current into terminals L2 and L3 in the same way as in step 7 above and
note the operate and reset values.
10. Inject a current equal to 10% of rated current into terminal L1.
11. Inject a current in the neutral-to-earth circuit with the same phase angle and with
polarity corresponding to an external fault.
12. Increase the current to five times the operating value and check that the
protection does not operate.
13. Finally check that trip information is stored in the event and disturbance
recorder.
12.3.4.2 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.
12.4 Impedance protection
12.4.1 Full scheme distance protection, mho characteristic
ZMHPDIS
Prepare the IED for verification of settings outlined in section "Requirements" and
section "Preparing for test" in this chapter.
Keep the current constant when measuring operating characteristics. Keep the current
as close as possible to its rated value or lower. But make sure it is higher than the set
minimum operating current.
Ensure that the maximum continuous current in an IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
To verify the mho characteristic, at least two points should be tested.
In the following, three test points are proposed. The mho characteristic always goes
through the origin, which automatically gives a fourth point for the characteristic.
1MRK502053-UEN B
Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC 109
Commissioning manual