The BLKU, BLKZ and 3PH signals should reset, if activated, see step
and
.
4.
Change the voltages and currents in all three phases simultaneously.
The voltage change must be higher than the set value
DU> and the current change must
be higher than the set value
DI<.
The BLKU, BLKZ and 3PH signals should not appear.
5.
Repeat step
.
6.
Connect the nominal voltages in all three phases and feed a current below the operate
level in all three phases.
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.
12.9.2.6
Completing the test
M1405-130 v5
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.
12.9.3
Fuse failure supervision VDSPVC
GUID-DCCD4C4A-8335-43BA-A2B2-9994380985B0 v2
Prepare the IED for verification of settings as outlined in section
in this chapter.
GUID-004BFFE4-B1C1-4C0E-8D7A-ABE7B566AB28 v2
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.
6. Decrease one of the three-phase voltages on main fuse group. The voltage change must
be greater than the set value for
Ud>MainBlock. MAINFUF signal is activated.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
203
Commissioning manual
