ABB RET670 Commissioning Manual page 276

Section 11
Testing functionality by secondary injection
270
6. Check the time until the warning limit has reached WrnHPTmpLev1 level
during injection. Monitor the signal WARNING1 until it appears on the
corresponding binary output.
7. Compare the measured temperature (HPTMPMAX) with WrnHPTmpLev1
setting.
8. check the time until the warning limit has reached WrnHPTmpLev2 level
during injection. Monitor the signal WARNING2 until it appears on the
corresponding binary output.
9. Compare the measured temperature (HPTMPMAX) with WrnHPTmpLev2
setting.
10. Wait for a time corresponding to tDelayToAlarm1 from the appearance of
WARNING1 signal. Make sure that the ALARM1 signal appears.
11. Note the time taken for the appearance of ALARM1 signal from the
appearance of WARNING1 signal, and compare it with set value
(tDelayToAlarm1).
12. Wait for a time corresponding to tDelayToAlarm2 from the appearance of
WARNING2 signal, and make sure that the ALARM2 signal appears.
13. Note the time taken for the appearance of ALARM2 signal from the
appearance of WARNING2 signal, and compare it with set value
(tDelayToAlarm2).
14. Activate the BLKWRN binary input. The WARNING1 and WARNING2
signals should disappear.
15. Activate the BLKALM binary input. The ALARM1 and ALARM2 signals
should disappear.
16. Reset the BLKWRN and BLKALM binary inputs. Once again warning and
alarm signals should appear.
17. Reduce the three-phase currents suddenly to value lower than the rated
current and take note of hot spot temperature.
18. Check the warnings reset limit (HystAbsHPT). Monitor the WARNING1 and
WARNING2 signals until they disappears on the corresponding binary
outputs. Take the HPTMPMAX readings and compare with the reset level
settings.
Verifying LOLINDAY and LOLINYRS outputs
1. Connect the test set for injection of three-phase currents to the appropriate
current terminals of the IED.
2. Make sure that the settings in the IED are appropriate, especially set the
EnaAgeCalc setting as Enable, TimeToUpdate setting as 1 hour and
AgeingRateMeth setting as IEC.
3. Activate the TOTVALID input and set some temperature value in TOTEMP
input.
4. Supply the IED with three-phase currents slightly more than the rated value.
5. Note the hot spot temperature (HPTMPMAX) and maintain it for another 1
hour.
6. Check the LOLINDAY and LOLINYRS outputs after 1 hour and compare it
with the calculated loss of life value using IEC standard method.
1MRK 504 165-UEN A
GUID-C1B747CC-F961-4C6B-BB72-5F32B3FB3F06 v1
Transformer protection RET670 2.2 IEC
Commissioning manual