• 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
GUID-4AFACF9B-9CA8-4960-9806-316FFCFEDEC0 v1
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
SEMOD53547-1 v1
11.7.1 Underfrequency protection SAPTUF
M16289-2 v7
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
11.7.1.1 Verifying the settings
M16289-15 v3
Verification of START value and time delay to operate
M16289-17 v7
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.
0.02 /0.04 0.04
r
StartFrequency floor f StartFrequency
IECEQUATION16059 V1 EN-US (Equation 103)
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 ST
ART signal appears and compare it
with the set value StartFrequency.
5. Increase the frequency until its rated value is reached.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
208 Line differential protection RED670 2.2 IEC
Commissioning manual
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