Completing The Test; Overfrequency Protection Saptof; Verifying The Settings - ABB RET670 Commissioning Manual
Relion 670 series, transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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Section 11
Testing functionality by secondary injection
11.7.1.2
11.7.2
11.7.2.1
216
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.
Overfrequency protection SAPTOF
Prepare the IED for verification of settings outlined in Section
to verify
settings".
Verifying the settings
Verification of START value and time delay to operate
1.
Check that the IED settings are appropriate, for example the start value and
the time delay.
2.
Supply the IED with three-phase voltages at their rated values and initial
frequency.
3.
Slowly increase the frequency of the applied voltage with a 40 mHz step,
applying it for a period that is 10% longer than tDelay.
4.
Note the operate value and compare it with the set value.
5.
Decrease the frequency to rated operating conditions.
6.
Check that the START signal resets.
7.
Set the frequency to 20 mHz under the operate value.
8.
Increase the frequency with a 40 mHz step, applying it for a period that is
10% longer than tDelay.
9.
Measure the time delay for the TRIP signal, and compare it with the set value.
Note that the measured time consists of the set value for time delay plus
minimum operate time of the start function (80 - 90 ms).
Extended testing
1.
The test above can be repeated to check the time to reset.
Verification of the low voltage magnitude blocking
1.
Check that the settings in the IED are appropriate, for example the
StartFrequency and the tDelay.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly decrease the magnitude of the applied voltage, until the BLKDMAGN
signal appears.
4.
Note the voltage magnitude value and compare it with the set value.
1MRK 504 165-UEN A
"Preparing the IED
Transformer protection RET670 2.2 IEC
Commissioning manual
M16289-57 v5
M16290-2 v7
M16290-12 v2
M16290-14 v6
M16290-28 v4
M16290-34 v6
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