Hitachi Relion 670 Series Commissioning Manual page 194

Section 11
Testing functionality by secondary injection
4. Check the measured time by comparing it to the set trip time tTrip.
5. Increase the voltage until PICKUP signal resets. Measure the time from reset of PICKUP signal to
reset of TRIP signal.
6. Check the measured time by comparing it to the set trip reset time tReset.
11.6.5.5 Final adjustment of compensation for VT ratio differences
Procedure
1. With the protection in test mode, view the differential voltage service values in each phase on the
local HMI under Main menu/Test/Function status/Voltage protection/VoltageDiff(PTDV,87V)/
VDCPTDV:x.
2. Record the differential voltages.
3. Calculate the compensation factor RF_x for each phase.
For information about calculation of the compensation factor, see the application manual.
4. Set the compensation factors on the local HMI under Main menu/Settings/Settings group N/
Voltage protection/VoltageDiff(PTDV,87V)/VDCPTDV:x
5. Check that the differential voltages are close to zero.
11.6.5.6 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.
11.6.6 Loss of voltage check LOVPTUV (27)
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
11.6.6.1 Measuring the trip limit of set values
1. Check that the input logical signals BLOCK, CBOPEN and BLKU are logical zero.
2. Supply a three-phase rated voltage in all three phases and note on the local HMI that the TRIP
logical signal is equal to the logical 0.
3. Switch off the voltage in all three phases.
After set tTrip time a TRIP signal appears on the corresponding binary output or on the local HMI.
4. Inject the measured voltages at rated values for at least set tRestore time.
5. Activate the CBOPEN binary input.
6. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
7. Inject the measured voltages at rated values for at least set tRestore time.
8. Activate the BLKU binary input.
9. Simultaneously disconnect all the three-phase voltages from the IED.
188
The IED voltage inputs should be connected to the VTs according to valid connection
diagram.
Note that TRIP at this time is a pulse signal, duration should be according to set tPulse.
© 2017 - 2023 Hitachi Energy. All rights reserved
1MRK506371-UUS Rev. M
"Requirements" and section
Line distance protection REL670
Commissioning manual
SEMOD175258-183 v4
SEMOD175258-208 v2
SEMOD175023-3 v5
"Preparing
SEMOD175023-7 v7