•
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
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
Summary of Contents for Relion 670 Series REL670
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