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1MRK 504 165-UEN Rev. K
function. Normally the counter will be tested when testing the function that the counter is connected
to, such as the trip function. When the function is configured, test it together with the function that
operates it. Trigger the function and check that the counter result corresponds to the number of
operations.
11.14.5.1
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.
11.14.6
Estimation of transformer insulation life LOLSPTR
Prepare the IED for verification of settings outlined in Section
11.14.6.1
Verifying the signals and settings
Time measurement and the injection of current and voltage can be done using common test
equipment.
Verifying HPTMPMAX and TOTCALC outputs
1.
Connect the test set for injection of three-phase currents to the appropriate current terminals of
the IED.
2.
Activate the TOTVALID input and set some temperature value in TOTEMP input.
3.
Supply the IED with three-phase currents slightly more than the rated value.
4.
Make sure that the hot spot temperature (HPTMPMAX) is more than the set value of TOTEMP.
5.
Activate the AMBVALID input and set some temperature value in AMBTEMP input.
6.
Make sure that the top oil temperature calculated (TOTCALC) is more than the set value of
AMBTEMP.
Verifying WARNINGx and ALARMx 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 the warning temperature
levels (WrnHPTmpLevX) and alarm time settings (tDelayToAlarmX).
3.
Supply three-phase currents nearly zero to the IED and take note of hot spot temperature
(HPTMPMAX).
4.
Make sure that the WARNINGx and ALARMx signals remains low.
5.
Supply three-phase currents slightly more than the rated value to the IED and take note of hot
spot temperature (HPTMPMAX).
Observe the maximum permitted overloading of the current circuits in the IED.
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).
Transformer protection RET670
Commissioning manual
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Testing functionality by secondary injection
GUID-325F040B-BADC-4281-B965-9B7D6BFA3E15 v2
GUID-C08B2360-2134-43DD-9F39-54CD9FA45B5B v1
"Preparing the IED to verify
GUID-1B9A0E70-A40C-4C83-A314-26B4B33C2F97 v1
GUID-95D0A8EC-8901-4269-9FD3-7D7F386E6BB3 v1
GUID-85CA2ABF-13A9-4A4B-8E3F-AEF71D091E32 v1
Section 11
settings".
267
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