11.5.6.2 Completing the test
SEMOD175060-148 v4
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.
11.5.7 Breaker failure protection, phase segregated activation and
output CCRBRF
M12104-2 v12
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 ST
ART 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.
11.5.7.1 Checking the phase current operate value,
IP>
M12104-23 v13
The check of the IP> current level is best made in FunctionMode = Current and
BuTripMode = 1 out of 3 or 2 out of 4.
1. Apply the fault condition, including START of CCRBRF, with a current
below the set IP>.
2. Repeat the fault condition and increase the current in steps until a trip occurs.
3. Compare the result with the set IP>.
If No CBPos Check or Retrip off is set, only back-up trip can be
used to check set IP>.
11.5.7.2 Checking the residual (earth fault) current operate value
IN>
set
below
IP>
M12104-80 v9
Check the low set IN> current where setting FunctionMode = Current and setting
BuTripMode = 1 out of 4
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 183
Commissioning manual
To Next Page
Loading...
Need help?
General
