1.
Check that the appropriate settings are available in the IED, especially the
PICKUP value and the definite time delay. Set
PickupFreqgrad
, to a rather small
negative value.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly decrease the frequency of the applied voltage, with an increasing rate-of-
change that finally exceeds the setting of
PickupFreqgrad
, and check that the
PICKUP signal appears.
4.
Note the operate value and compare it with the set value.
5.
Increase the frequency to rated operating conditions, and zero rate-of-change.
6.
Check that the PICKUP signal resets.
7.
Instantaneously decrease the frequency of the applied voltage to a value about
20% lower than the nominal value.
8.
Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
1.
The test above can be repeated to check a positive setting of
PickupFreqGrad
.
2.
The tests above can be repeated to test the RESTORE signal, when the frequency
recovers from a low value.
6.6.3.2
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/Frequency/SAPFRC(81,df/dt)/X:SAPFRC
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.
6.7
Testing secondary system supervision functions
6.7.1
Current circuit supervision CCSRDIF (87)
Prepare the IED for verification of settings as outlined in
Values of the logical signals for CCSRDIF (87) are available on the local HMI under
Main menu/Tests/Function status/Secondary system supervision/
CCSRDIF(87,INd)/X:CCSRDIF
. The Signal Monitoring in PCM600 shows the same
signals that are available on the local HMI.
Section 6
1MRK 506 331-UUS A
Testing functionality
98
Commissioning Manual
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