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1MRK 506 331-UUS A
6.6
6.6.1
6.6.1.1
Commissioning Manual
Testing frequency protection functions
Underfrequency protection SAPTUF (81)
Prepare the IED for verification of settings as outlined in
verify
settings".
Values of the logical signals for SAPTUF (81) are available on the local HMI under
Main menu/Tests/Function status/Frequency/SAPTUF(81,f<)/X:SAPTUF. The
Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
Verifying the settings
Verification of PICKUP value and time delay to operate
1.
Check that the IED settings 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 decrease the frequency of the applied voltage, until the PICKUP signal
appears.
4.
Note the operate value and compare it with the set value.
5.
Increase the frequency until rated operating levels are reached.
6.
Check that the PICKUP signal resets.
7.
Instantaneously decrease the frequency of the applied voltage to a value about
20% lower than the operate value.
8.
Measure the time delay of 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.
2.
The tests above can be repeated to test the frequency dependent inverse time
characteristic.
Verification of the low voltage magnitude blocking
1.
Check that the IED settings are appropriate, especially the PUFrequency and the
tDelay 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 SMAI set value
MinValFreqMeas.
Section 6
Testing functionality
5.1 "Preparing the IED to
95
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