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.
6.4.7.2
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/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Current/SDEPSDE(67N,IN<->)/1:SDEPSDE
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.
6.4.8
Thermal overload protection, one time constant, Fahrenheit/
Celsius LFPTTR/LCPTTR (26)
Prepare the IED for verification of settings as outlined in
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>)/1:LFPTTR
,
Main menu/Tests/Function status/Current/LCPTTR(26,T>)/1:LCPTTR
. 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.
6.4.8.1
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>)/1:LFPTTR
,
Main menu/Clear/Clear
temperature constant/LCPTTR(26,8>)/1:LCPTTR
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>)/
1:LFPTTR/Outputs/TEMP
,
Main menu/Tests/Function status/Current/
LCPTTR(26,8>)/1:LCPTTR/Outputs/TEMP
4.
Check the time until the alarm limit has reached the
AlarmTemp
level during
injection.
Section 6
1MRK 506 331-UUS A
Testing functionality
74
Commissioning Manual
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