Completing The Test; Voltage-Restrained Time Overcurrent Protection Vrpvoc; Verifying The Settings - ABB rec670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.4.15.2
10.4.16
10.4.16.1
114
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:
f
[ ]
[ ]
%
= injected ×
I % U
inj
f
rated
EQUATION2274 V1 EN
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.

Completing the test

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.

Voltage-restrained time overcurrent protection VRPVOC

Prepare the IED for verification of settings outlined in section
verify settings".

Verifying the settings

Verifying settings by secondary injection
1. Connect the test set for three-phase current injection and three-phase voltage
injection to the appropriate IED terminals.
2. Go to Main menu/Settings/IED Settings/Current protection/
VoltageRestOverCurr ( 51V,2(I>/U<))/VRPVOC (51V,2(I>/U<)):1/
General and make sure that the function is enabled, that is, Operation is set to
On.
3. The test of the function may be performed by injecting restrain voltage and
increasing the injected current(s). Note the value at which the START and STOC
signals are set.
In the following equations, restrain voltage is the magnitude of
the minimum phase-to-phase voltage in secondary volts.
1MRK 511 360-UEN A
(Equation 14)
"Preparing the IED to
Bay control REC670 2.1 IEC
Commissioning manual