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Section 10
Testing functionality by secondary injection
The expected value depends on whether definite or inverse time was selected.
4.
Continue to test another function or complete the test by setting the test mode to Off.
Residual overvoltage release and protection
Procedure
1.
Measure that the operate voltage is equal to the UN> setting.
The function activates the START and STUN signals.
2.
Measure the operate time by injecting a voltage 1.2 times set UN> operate value.
3.
Compare the result with the set tUN operate value.
4.
Inject a voltage 0.8 · UNRel> and a current high enough to operate 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 UNRel> operate value.
10.5.5.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
10.5.6
Thermal overload protection, one time constant, Celsius LPTTR
Prepare the IED for verification of settings outlined in Section
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.
10.5.6.1
Measuring the operate and time limit of set values
Testing the protection without external temperature compensation (NonComp)
1.
Reset the thermal memory on the local HMI under Main menu /Reset /Reset temperature /
ThermalOverload1TimeConst(PTTR,26) /LPTTR:x ,
2.
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) /LPTTR:x /TEMP
3.
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.
4.
Measure the LPTTR protection trip time.
Use the TRIP signal from the configured binary output to stop the timer.
5.
Take the TEMP readings.
Compare with the setting of TripTemp.
6.
Activate the BLOCK binary input.
The signals ALARM, START and TRIP should disappear.
7.
Reset the BLOCK binary input.
8.
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.
9.
Compare the measured trip time with the setting according to the formula.
10.
Reset the thermal memory.
11.
Continue to test another function or end the test by changing the test mode setting to Off.
108
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1MRK 506 377-UEN Rev. L
GUID-3BCDAD80-BBFE-4D98-97B1-8EF11B109304 v1
"Preparing the IED to verify
Railway application RER670
Commissioning manual
SEMOD175060-131 v6
SEMOD175060-148 v4
settings".
M14950-8 v3
M14950-10 v10
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