5.
Slowly decrease the frequency of the applied voltage, to a value below
StartFrequency
.
6.
Check that the START signal does not appear.
7.
Wait for a time corresponding to
tDelay
, and check that the TRIP signal does
not appear.
6.5.1.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Off
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/SAPTUF(81,f<)/X:SAPTUF
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.
6.5.2
Overfrequency protection SAPTOF
Prepare the IED for verification of settings as outlined in
.
Values of the logical signals for SAPTOF are available on the local HMI under
Main menu/Tests/Function status/Frequency/SAPTOF(81,f>)/X:SAPTOF
. The
Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
6.5.2.1
Verifying the settings
Verification of START value and time delay to operate
1.
Check that the settings in the IED are appropriate, especially the START
value and the definite time delay.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly increase the frequency of the applied voltage, until the START signal
appears.
4.
Note the operate value and compare it with the set value.
5.
Decrease the frequency to rated operating conditions.
6.
Check that the START signal resets.
7.
Instantaneously increase the frequency of the applied voltage to a value about
20% higher than the operate 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 the time to reset.
Verification of the low voltage magnitude blocking
1MRK 511 248-UEN -
Section 6
Testing functionality
65
Commissioning Manual
