7. Keep the current constant. Disconnect the voltage in all three phases
simultaneously.
The BLKU, BLKZ and 3PH signals should not appear.
8. Change the magnitude of the voltage and current for phase 1 to a value higher
than the set value DU> and DI<.
9. Check that the start output signals STDUL1 and STDIL1 and the general start
signals STDU or STDI are activated.
10. Check that the start output signals for the current and voltage phases 2 and 3 are
activated by changing the magnitude of the voltage and current for phases 2 and
3.
10.9.2.6 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.
10.9.3 Fuse failure supervision VDSPVC
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
Checking the operation of binary input and output
1. Simulate normal operation conditions with three-phase voltage on the main fuse
group and the pilot fuse group. Ensure the values are equal to their rated values.
2. Disconnect one of the phase voltage from the main fuse group or the pilot fuse
group. Observe the binary outputs of the IED. The MAINFUF or the PILOTFUF
signals are simultaneously activated. Only the output circuit related to the open
phase will be active i.e either MAINFUF or PILOTFUF.
3. Establish a normal voltage operating condition and observe the corresponding
output signals. MAINFUF or PILOTFUF should change to 0 in about 27 ms.
4. Set normal conditions as mentioned in step 1.
5. Enable the BLOCK binary input and repeat step 2. MAINFUF or PILOTFUF
should not appear.
Checking the operation of MAINFUF and PILOTFUF
1. Simulate normal operation conditions with three-phase voltage on the main fuse
group and the pilot fuse group. Ensure the values are equal to their rated values.
2. Decrease one of the three-phase voltages on main fuse group or pilot fuse group.
The voltage change must be greater than the set value for Ud>MainBlock or
Ud>PilotAlarm. MAINFUF or PILOTFUF signals are activated without any
time delay.
3. Set normal conditions as mentioned in step 1. MAINFUF or PILOTFUF signals
should reset.
4. Set SealIn to On, UD>MainBlock to 20% of UBase and USealIn to 70% of
UBase.
5. Apply three-phase voltages with the value slightly below USealIn level.
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 193
Commissioning manual
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