5.
Slowly decrease the frequency of the applied voltage, to a value below
PUFrequency
.
6.
Check that the PICKUP signal does not appear.
7.
Wait for a time corresponding to
tDelay
, and check that the TRIP signal does not
appear.
6.6.1.2
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/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.
6.6.2
Overfrequency protection SAPTOF (81)
Prepare the IED for verification of settings as outlined in
Values of the logical signals for SAPTOF (81) 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.
6.6.2.1
Verifying the settings
Verification of PICKUP value and time delay to operate
1.
Check that the settings in the IED are appropriate, especially the PICKUP 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 PICKUP 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 PICKUP 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.
Section 6
1MRK 506 331-UUS A
Testing functionality
96
Commissioning Manual
Summary of Contents for Relion 650 Series REL650
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