6. Set the alarm time delay to the correct value according to the setting plan and
check the time delay, injecting a voltage corresponding to 1.2 · V/Hz>.
7. Connect a trip output contact to the timer and temporarily set the time delay tMin
to 0.5s.
8. Increase the voltage and note the V/Hz>> operate value
9. Reduce the voltage slowly and note the reset value.
10. Set the time delay to the correct value according to the setting plan and check the
time delay tMin, injecting a voltage corresponding to 1.2 · V/Hz>>.
11. Check that trip and alarm contacts operate according to the configuration logic.
12. Set the cooling time constant temporarily to min value (1min.) to quickly lower
the thermal content.
13. Wait for a period equal to 6 times Tcooling switch 20 minutes on a voltage 1.15 ·
V/Hz> and check the inverse operate time.
Wait until the thermal memory is emptied, set the cooling time constant
according to the setting plan and check another point on the inverse time curve
injecting a voltage 1.3 · V/Hz>.
14. Finally check that START and TRIP information is stored in the event menu.
10.6.4.2 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.
10.6.5 Voltage differential protection VDCPTOV
Prepare the IED for verification of settings as outlined in section "Requirements" and
section "Preparing for test" in this chapter.
10.6.5.1 Check of undervoltage levels
This test is relevant if the setting BlkDiffAtULow = Yes.
Check of U1Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure
37.
2. Apply voltage higher than the highest set value of UDTrip, U1Low and U2Low
to the U1 three-phase inputs and to one phase of the U2 inputs according to
figure
37.
The voltage differential START signal is set.
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 175
Commissioning manual
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