ABB RELION 670 Series Commissioning Manual page 99

1MRK 505 339-UEN B
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:
[ ]
I %
inj
EQUATION2274 V1 EN-US
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.
10.3.10.2 Completing the test
Continue to test another functions or end the test by changing the Test mode setting to
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.
10.4 Voltage protection
10.4.1 Two step undervoltage protection UV2PTUV
Prepare the IED for verification of settings as outlined in the section
this chapter.
10.4.1.1 Verifying the settings
Verification of START value and time delay to operate for Step 1
1. Check that the IED settings are appropriate, especially the START value, the definite time
delay and the
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the START signal appears.
4. Note the operate value and compare it with the set value.
Commissioning manual
f
[ ]
%
= ×
injected
U
f
rated
Note that it is recommended to test IDMT operating times by injected current
with the rated frequency.
1 out of 3 operation mode.
Testing functionality by secondary injection
(Equation 14)
GUID-5AB7880E-629C-45E5-AF91-3EBDF19DEA79 v2
"Preparing for test"
Section 10
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M13796-9 v3
M13796-29 v9
93