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.
13.5.6.2 Completing the test
SEMOD175060-148 v4
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.
13.5.7 Thermal overload protection, two time constants TRPTTR
(49)
SEMOD53632-3 v5
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
13.5.7.1 Checking trip and reset values
SEMOD53632-11 v7
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 trip value of stage
IBase1, increase the current in phase A until stage IBase1trips and note the trip
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 trip and reset values of IBase1 for phases B and C.
5. Activate the cooling input signal, thus switching to base current IBase2.
6. Check the trip 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 A 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.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
200 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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