4. Inject a voltage 0.8 · VNRelPU 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 VNRelPU operate value.
6.3.7.2 Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is
tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Current/SDEPSDE(67N,IN<->)/SDEPSDE:1 for the function, or for each
individual function in a chain, to be tested next. Remember to set the parameter Blocked to
Yes, for each individual function that has been tested.
6.3.8 Thermal overload protection, one time constant, Fahrenheit/
Celsius LFPTTR/LCPTTR (26)
Prepare the IED for verification of settings as outlined in 5.1 "Preparing the IED to verify
settings".
Values of the logical signals for LFPTTR/LCPTTR (26) are available on the local HMI
under , Main menu/Tests/Function status/Current/LFPTTR(26,T>)/LFPTTR:1,
Main menu/Tests/Function status/Current/LCPTTR(26,T>)/LCPTTR:1. The
Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
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.
6.3.8.1 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/Clear/Clear
temperature constant/LFPTTR(26,8>)/LFPTTR:1, Main menu/Clear/Clear
temperature constant/LCPTTR(26,8>)/LCPTTR:1
3. Switch the fault current on and take note of the temperature, available on the local
HMI under Main menu/Tests/Function status/Current/LFPTTR(26,8>)/
LFPTTR:1/Outputs/TEMP, Main menu/Tests/Function status/Current/
LCPTTR(26,8>)/LCPTTR:1/Outputs/TEMP
4. Check the time until the alarm limit has reached the AlarmTemp level during
injection.
Section 6 1MRK 505 293-UUS A
Testing functionality
58
Commissioning manual
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