7.
Stop injection of all currents (that is, set all currents back to 0A).
8.
Check that all above mentioned function binary output signals now have
logical value zero.
9.
Repeat above steps 1 - 8 for phase L2 and phase L3.
10. Repeat above steps 1 - 8 to test different points from the above table.
Operation of this feature is based on internally calculated peak RMS voltage value.
That means that this feature is also able to operate for current signals with varying
frequency. Note that for the fundamental frequency injection, internally calculated
voltage in percent corresponds directly to the injected current value given in
percent. However if it is required to test IDMT characteristic with a varying
frequency, the magnitude of the injected current must be adjusted accordingly. The
following formula can be used to calculate required current RMS value in percent
at the desired injection frequency in order to archive voltage percentage value
given in the above table:
[ ]
[ ]
%
%
injected
rated
inj
f
I
U
f
=
×
EQUATION2274 V1 EN-US
(Equation 14)
Note that it is recommended to test IDMT operating times by
injected current with the rated frequency.
Above procedure can also be used to test definite time step. Pay attention that
IDMT step can also operate during such injection. Therefore make sure that
appropriate settings are entered in order to insure correct test results for definite
time step.
10.4.10.2
Completing the test
GUID-5AB7880E-629C-45E5-AF91-3EBDF19DEA79 v2
Continue to test another functions or end the test by changing the Test mode setting
to
Off
. Restore connections and settings to their original values, if they were
changed for testing purposes. Make sure that all built-in features for this function,
which shall be in operation, are enabled and with correct settings.
10.5
Voltage protection
SEMOD53540-1 v1
10.5.1
Two step undervoltage protection UV2PTUV
M13796-2 v6
Prepare the IED for verification of settings outlined in Section
10.5.1.1
Verifying the settings
M13796-9 v3
Section 10
1MRK 505 372-UEN A
Testing functionality by secondary injection
112
Busbar protection REB670 2.2 IEC
Commissioning manual
