11. Switch on the injection current and check that ALARM1 and ALARM2 contacts
operate at the set percentage level and that the operate time for tripping is in
accordance with the set Time Constant 1 (Tau1).
With setting Itr = 101%IBase1 and injection current 1.50 · IBase1, the trip time
from zero content in the memory shall be 0.60 · Time Constant 1 (Tau1).
12. Check that all trip and alarm contacts operate according to the configuration
logic.
13. Switch off the injection current and check from the service menu readings of
thermal status and LOCKOUT that the lockout resets at the set percentage of
heat content.
14. Activate the cooling input signal to switch over to base current IBase2.
Wait 5 minutes to empty the thermal memory and set Time Constant 2 (Tau2) in
accordance with the setting plan.
15. Test with injection current 1.50 · IBase2 the thermal alarm level, the operate
time for tripping and the lockout reset in the same way as described for stage
IBase1.
16. Finally check that start and trip information is stored in the event menu.
10.4.8.2 Completing the test
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.
10.4.9 Breaker failure protection, phase segregated activation and
output CCRBRF
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
The Breaker failure protection, 3-phase activation and output function CCRBRF
should normally be tested in conjunction with some other function that provides a start
signal. An external START signal can also be used.
To verify the settings in the most common back-up trip mode 1 out of 3, it is sufficient
to test phase-to-earth faults.
At mode 2 out of 4 the phase current setting, IP> can be checked by single-phase
injection where the return current is connected to the summated current input. The
value of residual (earth fault) current IN set lower than IP> is easiest checked in back-
up trip mode 1 out of 4.
10.4.9.1 Checking the phase current operate value,
IP>
The check of the IP> current level is best made in FunctionMode = Current and
BuTripMode = 1 out of 3 or 2 out of 4.
1MRK 511 360-UEN A Section 10
Testing functionality by secondary injection
Bay control REC670 2.1 IEC 99
Commissioning manual
To Next Page
Loading...
Need help?
General
