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Section 11
Testing functionality by secondary injection
•
Create a L2L3 fault such that their phase voltage magnitudes are lower than UPhSel< times
corresponding quadrature phase to phase voltage and set Tau to default value.
•
Check that TRIP, TRL1, TRL2 and TRL3 are generated after the set delay time of t3Ph and
ARST, ARST3PH, ARSTL1, ARSTL2 and ARSTL3 are also activated.
•
Check that activated trip signals and start signals are blocked by enabling BLKTR and BLKST.
•
Check that all activated signals are disabled by BLOCK input.
11.6.7.2
Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to Off under:
Main menu /Tests /IED test mode /TESTMODE:1
Restore connections and settings to their original values if they were changed for testing purposes.
11.7
Frequency protection
11.7.1
Underfrequency protection SAPTUF
Prepare the IED for verification of settings outlined in Section
11.7.1.1
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.
The initial frequency is calculated using Equation 103.
StartFrequency
IECEQUATION16059 V1 EN-US
3.
Slowly decrease the voltage frequency by steps of 40 mHz until the START signal appears;
during each step apply the voltage signal for a time that is either at least 10% longer than
(tDelay+100ms) or a suitable time to monitor the function.
4.
Note the frequency value at which the START signal appears and compare it with the set value
StartFrequency.
5.
Increase the frequency until its rated value is reached.
6.
Check that the START signal resets.
7.
Supply the IED with three-phase voltages at their rated values and frequency 20 mHz over the
set value StartFrequency.
8.
Decrease the frequency with a 40 mHz step, applying it for a time that is at least 10% longer
than (tDelay+100ms).
9.
Measure the time delay of the TRIP signal, and compare it with the set value tDelay. Note that
the measured time consists of the set value of the time delay plus the 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.
2.
The tests above can be repeated to test the frequency dependent inverse time characteristic.
Verification of the low voltage magnitude blocking
192
0.02
floor f
StartFrequency
r
© 2017 - 2022 Hitachi Energy. All rights reserved
"Preparing the IED to verify
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0.04
Line differential protection RED670
1MRK 505 378-UEN Rev. K
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M16289-2 v7
settings".
M16289-15 v3
M16289-17 v7
(Equation 103)
M16289-31 v6
M16289-39 v7
Commissioning manual
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