• 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.
10.6.7.2 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.
10.7 Frequency protection
10.7.1 Underfrequency protection SAPTUF
Prepare the IED for verification of settings outlined in section "Preparing the IED to
verify settings".
10.7.1.1 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.
3. Slowly decrease the frequency of the applied voltage, until the START signal
appears.
4. Note the operate value and compare it with the set value.
5. Increase the frequency until rated operating levels are reached.
6. Check that the START signal resets.
7. Instantaneously decrease the frequency of the applied voltage to a value about
1% lower than the operate value (a step change more than 2% will increase the
time delay).
8. Measure the time delay of 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).
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
182 Line distance protection REL670 2.1 IEC
Commissioning manual
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