10.5.6.2 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.
10.5.7 Thermal overload protection, one time constant, Celsius/
Fahrenheit LCPTTR/LFPTTR
Prepare the IED for verification of settings outlined in section "Preparing the IED to
verify settings".
Check that the input logical signal BLOCK is logical zero and that on the local HMI,
the logical signal TRIP, START and ALARM are equal to logical zero.
10.5.7.1 Measuring the operate and time limit of set values
Testing the protection without external temperature compensation
(NonComp)
1. Quickly set the measured current (fault current) in one phase to about 300% of
IRef (to minimise the trip time), and switch the current off.
2. Reset the thermal memory on the local HMI under Main menu/Reset/Reset
temperature/ThermalOverload1TimeConst(PTTR,26)/LFPTTR:x, Main
menu/Reset/Reset temperature/ThermalOverload1TimeConst(PTTR,26)/
LCPTTR:x,
3. Switch the fault current on and take note of the temperature, available on the
local HMI under Main menu/Test/Function status/Current protection/
ThermOverLoad1TimeConst(PTTR,26)/LFPTTR:x/TEMP, Main menu/
Test/Function status/Current protection/
ThermOverLoad1TimeConst(PTTR,26)/LCPTTR:x/TEMP,
4. Check the time until the actual temperature TEMP has reached the AlarmTemp
level during injection.
Monitor the signal ALARM until it appears on the corresponding binary output
or on the local HMI.
5. Measure the LCPTTR/LFPTTRprotection trip time.
Use the TRIP signal from the configured binary output to stop the timer.
6. Take the TEMP readings.
Compare with the setting of TripTemp.
7. Activate the BLOCK binary input.
The signals ALARM, START and TRIP should disappear.
8. Reset the BLOCK binary input.
9. Check the reset limit (TdReset).
Monitor the signal START until it disappears on the corresponding binary
output or on the local HMI, take the TEMP readings and compare with the
setting of ReclTemp.
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
156 Line distance protection REL670 2.1 IEC
Commissioning manual
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