11. Switch on the injection current and check that ALARM1 and ALARM2 contacts trip at the set
percentage level and that the trip 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 trip 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 trip time for tripping and the
lockout reset in the same way as described for stage IBase1.
16. Finally check that pickup and trip information is stored in the event menu.
11.5.8.2 Completing the test
SEMOD53632-51 v5
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.
11.5.9 Breaker failure protection, phase segregated activation and
output CCRBRF (50BF)
M12104-2 v13
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 (50BF) should normally
be tested in conjunction with some other function that provides an initiate signal. An external BFI_3P
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-
ground faults.
At mode 2 out of 4 the phase current setting, Pickup_PH can be checked by single-phase injection where
the return current is connected to the summated current input. The value of residual (ground fault)
current IN set lower than Pickup_N is easiest checked in back-up trip mode 1 out of 4.
11.5.9.1 Function revision history
GUID-3A043295-3AE3-437E-BBE9-D7FD6F349892 v2
Document
revision
Product
revision
History
A 2.2.1 I>BlkCBPos setting functionality correction.
B 2.2.1 -
C 2.2.2 -
D 2.2.3 Setting StartMode is added to choose how retrip and backup trip timers are run. The choices
are; to run the timers by external start signal which is latched, to follow the external start
signal only or to follow the external start signal and the selected FunctionMode.
E 2.2.3 -
F 2.2.4 -
G 2.2.4 -
H 2.2.5 -
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
180 Transformer protection RET670
Commissioning manual
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