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Residual overvoltage release and protection
SEMOD175060-131 v4
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 timers 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.
7.3.7.2
Completing the test
SEMOD175060-148 v4
Continue to test another function or end the testing by setting the parameter
TestMode to Off
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.
7.3.8
Thermal overload protection, one time constant, Celsius/
Fahrenheit LCPTTR/LFPTTR
M14950-2 v7.1.1
Prepare the IED for verification of settings as outlined in section
.
Values of the logical signals for LCPTTR/LFPTTR are available on the local HMI under , Main
menu/Tests/Function status/Current/LCPTTR(26,T>)/LCPTTR:1, Main menu/Tests/
Function status/Current/LFPTTR(26,T>)/LFPTTR: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, START and ALARM are equal to logical zero.
7.3.8.1
Testing the protection without external temperature compensation
(NonComp)
M14950-10 v7
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.
Monitor the signal ALARM until it appears on the corresponding binary output or on the
local HMI.
5.
Compare the measured temperature with the setting.
6.
Measure the LCPTTR/LFPTTRprotection trip time.
Use the TRIP signal from the configured binary output to stop the timer.
7.
Take the TEMP readings.
Compare with the setting of
TripTemp.
1MRK 505 293-UEN B
Section 7
Testing functionality
Breaker protection REQ650
53
Commissioning manual
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