Hitachi Relion 670 Series Commissioning Manual page 205

1MRK506371-UUS Rev. M
4. Apply three-phase currents with their rated value and zero voltages.
5. Decrease the measured current in one phase until the DLD1PH signal appears.
6. This is the point at which the dead line condition is detected. Check the value of the decreased
current with the set value IDLDPU (IDLDPU is in percentage of the base current IBase).
11.9.2.5 Checking the operation of the dv/dt and di/dt based function
Check the operation of the dv/dt and di/dt based function if included in the IED.
1. Simulate normal operating conditions with the three-phase currents in phase with their
corresponding phase voltages and with all of them equal to their rated values.
2. Change the voltages and currents in all three phases simultaneously.
The voltage change must be higher than the set value DVPU and the current change must be lower
than the set value DIPU.
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•
3. Apply normal conditions as in step 1.
The BLKV, BLKZ and 3PH signals should reset, if activated, see step
4. Change the voltages and currents in all three phases simultaneously.
The voltage change must be higher than the set value DVPU and the current change must be
higher than the set value DIPU.
The BLKV, 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 trip level in all three
phases.
7. Keep the current constant. Disconnect the voltage in all three phases simultaneously.
The BLKV, 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
DVPU and DIPU.
9. Check that the pickup output signals PU_DV_A and PU_DI_A and the general pickup signals
PU_DV or PU_DI are activated.
10. Check that the pickup 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.
11.9.2.6 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.9.3 Fuse failure supervision
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
Line distance protection REL670
Commissioning manual
The BLKV and BLKZ signals appear without any time delay. The BLKZ signal will be
activated only if the internal deadline detection is not activated at the same time.
3PH should appear after 5 seconds, if the remaining voltage levels are lower than the set
VDLDPU of the dead line detection function.
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Testing functionality by secondary injection
1 and 2.
GUID-DCCD4C4A-8335-43BA-A2B2-9994380985B0 v2
"Requirements" and section
Section 11
M1405-96 v12
M1405-130 v5
"Preparing
199