4. Compare the measured time with the set value tOper.
5. Activate the BLOCK binary input.
6. Switch on the fault current (110% of the setting) and wait longer than the set
value tOper.
No TRIP signal should appear.
7. Switch off the fault current.
8. Set the measured current (fault current) in same phase to about 90% of the set
operating current IP>. Switch off the current.
9. Switch on the fault current and wait longer than the set value tOper.
No TRIP signal should appear.
10. Switch off the fault current.
10.5.13.2 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
10.5.14 Voltage-restrained time overcurrent protection VRPVOC
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
10.5.14.1 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.
The set operate value in secondary amperes is calculated according to the
following equations:
First part of the characteristic (Restrain voltage ≤ 25% of UBase):
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 167
Commissioning manual
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