Table of Contents
Advertisement
Section 11
Testing functionality by secondary injection
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.
11.14.6.2
Completing the test
Continue to test another function or end the test by changing the Test mode setting to Off. Restore
connections and settings to their original values, if they were changed for testing purposes.
11.14.7
Through fault monitoring PTRSTHR
Prepare the IED for verification of settings outlined in Section
11.14.7.1
Verifying the signals and settings
The voltage or current can be injected using a common test equipment.
Verifying the through fault detection
1.
Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for through fault detection such as W1I>, W2I> and W3I> are
set correctly.
3.
Ensure that the BLOCK and INHIBIT inputs are not activated.
4.
Set tMin as 0 s to check the start level of through fault detection.
5.
Slowly increase any phase current of any winding until ALARM signal appears.
6.
Compare the injected phase current value with the set threshold limit value.
7.
Bring the injected three-phase currents at the rated value.
8.
Change the tMin setting to a particular value.
9.
Slowly increase any phase current of any winding to the threshold limit and wait until the
ALARM signal appears.
10.
Compare the wait time with the set tMin value.
11.
Bring the injected three-phase currents to the rated value.
268
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 504 165-UEN Rev. K
GUID-C1B747CC-F961-4C6B-BB72-5F32B3FB3F06 v1
GUID-46EC57EA-375B-4DBD-BE18-914156083384 v1
GUID-7AE60CB5-3CD5-4FE2-8D54-664AA78DD2DE v1
GUID-079BCF22-469C-42EA-B857-E28154EC13D9 v1
"Preparing the IED to verify
GUID-0295EF7C-217E-4400-B7C2-68C00A38ADF3 v1
GUID-148CA255-735B-42B3-9046-AD91B20DB261 v1
Transformer protection RET670
Commissioning manual
settings".
Advertisement
Table of Contents
