Completing The Test; Voltage Differential Protection Vdcptov; Check Of Undervoltage Levels - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.6.4.2
11.6.5
11.6.5.1
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
1. Enable function.
2. Connect a symmetrical three-phase voltage input from the test set to the
appropriate connection terminals of the overexcitation protection OEXPVPH
is configured for a three-phase voltage input.
A single-phase injection voltage is applied if the function is configured for a
phase-to-phase voltage input.
OEXPVPH is conveniently tested using rated frequency for the injection
voltage and increasing the injection voltage to get the desired overexcitation
level.
3. Connect the alarm contact to the timer and set the time delay tAlarm
temporarily to zero.
4. Increase the voltage and note the operate value V/Hz>.
5. Reduce the voltage slowly and note the reset value.
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.

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.

Voltage differential protection VDCPTOV

Prepare the IED for verification of settings as outlined in section
and section "Preparing for test"

Check of undervoltage levels

This test is relevant if the setting BlkDiffAtULow = Yes.
in this chapter.
Section 11
M6583-85 v4
SEMOD175258-3 v2
"Requirements"
SEMOD175258-71 v2
209