10. Compare the measured trip time with the setting according to the formula.
11. Reset the thermal memory.
12. Continue to test another function or end the test by changing the test mode setting
to
Off
.
10.4.7.2
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.
10.4.8
Thermal overload protection, two time constants TRPTTR
Prepare the IED for verification of settings outlined in section
10.4.8.1
Checking operate and reset values
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
IBase1
operates 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.
Section 10
1MRK 511 360-UEN A
Testing functionality by secondary injection
98
Bay control REC670 2.1 IEC
Commissioning manual
