1.
Connect symmetrical three-phase currents to the appropriate current terminals of the
IED.
2.
Set the Time constant 1 (
Tau1) and Time Constant 2 (Tau2) temporarily to 1 minute.
3.
Set the three-phase injection currents slightly lower than the set operate value of stage
IBase1, increase the current in phase L1 until stage IBase1operates and note the operate
value.
Observe the maximum permitted overloading of the current circuits in the
IED.
4.
Decrease the current slowly and note the reset value.
Check, in the same way, the operate and reset values of
IBase1 for phases L2 and L3.
5.
Activate the cooling input signal, thus switching to base current
IBase2.
6.
Check the operate and reset values (for all three phases) for
IBase2 in the same way as
described above for stage
IBase1.
7.
Deactivate the input signal for stage
IBase2.
8.
Set the time constant for
IBase1 in accordance with the setting plan.
9.
Set the injection current for phase L1 to 1.50 ·
IBase1.
10. Connect a trip output contact to the timer and monitor the output of contacts ALARM1
and ALARM2 to digital inputs in test equipment.
Read the heat content in the thermal protection from the local HMI and wait until the
content is zero.
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.
12.5.8.2
Completing the test
SEMOD53632-51 v5
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.
12.5.9
Breaker failure protection, phase segregated activation and
output CCRBRF
M12104-2 v11
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
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.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
164
Commissioning manual
