ABB RELION RET670, Installation And Commissioning Manual

Page: 170 / 240

1. Check that the input logical signals BLOCK, CBOPEN and VTSU 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.
Note that TRIP at this time is a pulse signal, duration should
be according to set
tPulse .
4. Inject the measured voltages to their 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 to their rated values for at least set tRestore time.
8. Activate the VTSU binary input.
9. Simultaneously disconnect all the three-phase voltages from the tRestore .
No TRIP signal should appear.
10. Reset the VTSU binary input.
11. Inject the measured voltages to their rated values for at least set
tRestore time.
12. Activate the BLOCK binary input.
13. Simultaneously disconnect all the three-phase voltages from the terminal.
No TRIP signal should appear.
14. Reset the BLOCK binary input.
13.7.6.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off . Restore connections and settings to their original values, if they were
changed for testing purposes.
13.8 Frequency protection
13.8.1 Underfrequency protection SAPTUF
Prepare the IED for verification of settings as outlined in section "Overview" and
section "Preparing for test" in this chapter.
13.8.1.1 Verifying the settings
Verification of START value and time delay to operate
Section 13
1MRK 504 088-UEN C
Verifying settings by secondary injection
164
Installation and commissioning manual