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1MRK 505 372-UEN Rev. K
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 2.
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.
10.8.1.6
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
10.8.2
Fuse failure supervision VDSPVC
Prepare the IED for verification of settings as outlined in section
section
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.
7.
After more than 5 seconds increase the measured voltage back to the value slightly below
USealIn level. MAINFUF signal should not reset.
8.
Slowly increase measured voltage to the value slightly above USealIn until MAINFUF signal
resets.
9.
Record the measured voltage and compare with the set value USealIn.
Busbar protection REB670
Commissioning manual
"Preparing for test"
in this chapter.
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
GUID-DCCD4C4A-8335-43BA-A2B2-9994380985B0 v2
"Requirements"
and
GUID-004BFFE4-B1C1-4C0E-8D7A-ABE7B566AB28 v2
Section 10
M1405-130 v5
115
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