1.
Check that the IED settings are appropriate, for example the pickup value and the
time delay.
2.
Supply the IED with three-phase voltages at their rated values and frequency 20
mHz over the set value
StartFrequency
, applying it for a time that is at least 10%
longer than (
tDelay
+100 ms).
3.
Verify that the TRIP signal is active.
4.
Decrease the frequency with a 40 mHz step, applying it until the TRIP signal resets.
5.
Measure the reset time of the
TRIP
signal, and compare it with the technical data of
the function.
Verification of the low voltage magnitude blocking
1.
Check that the IED settings are appropriate, especially the
PUFrequency
and the
tDelay
in SAPTOF, and the
GlobalBaseSel
and the
MinValFreqMeas
in the SMAI
preprocessing function.
2.
Supply the IED with three-phase voltages at rated values.
3.
Slowly decrease the magnitude of the applied voltage until the BLKDMAGN signal
appears.
4.
Note the voltage magnitude value and compare it with the value
MinValFreqMeas
x
UBase / 100.
Where:
•
MinValFreqMeas
is a set value of the SMAI.
•
UBase is the value in the GBASVAL group identified by the setting
GlobalBaseSel
.
5.
Slowly increase the frequency of the applied voltage, to a value above
PUFrequency
as explained in Section
Verification of START value and time delay to operate
6.
Check that the PICKUP signal does not appear.
7.
Wait for a time corresponding to (
tDelay
+100 ms), and check that the TRIP signal
does not appear.
8.
Slowly increase the magnitude of the applied voltages until the
BLKDMAGN
signal
resets.
9.
Verify that the signal
PICKUP
appears and wait for a time at least equal to (
tDelay
+100 ms) to verify that also the signal TRIP becomes active.
6.5.2.2
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/Frequency/SAPTOF(81,f>)/SAPTOF:X
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.
Section 6
1MRK 505 293-UUS A
Testing functionality
84
Commissioning manual
