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1MRK 511 366-UUS -
11.4.4.2
11.4.5
11.4.5.1
Commissioning manual
4.
Inject a voltage 0.8 · VNRelPU and a current high enough to trip the directional
function at the chosen angle.
5.
Increase the voltage until the directional function is released.
6.
Compare the measured value with the set VNRelPU trip value.
Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
Thermal overload protection, one time constant, Fahrenheit/
Celsius LFPTTR/LCPTTR (26)
Prepare the IED for verification of settings outlined in section
settings".
Check that the input logical signal BLOCK is logical zero and that on the local HMI, the
logical signal TRIP, PICKUP and ALARM are equal to logical zero.
Measuring the trip 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 LFPTTR/LCPTTR (26)protection trip time.
Use the TRIP signal from the configured binary output to stop the timer.
Testing functionality by secondary injection
Section 11
"Preparing the IED to verify
133
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