Rate-Of-Change Frequency Protection Sapfrc; Verifying The Settings; Completing The Test - ABB REG650 Commissioning Manual

1MRK 502 049-UEN A
6.7.3
6.7.3.1
6.7.3.2
Commissioning manual

Rate-of-change frequency protection SAPFRC

Prepare the IED for verification of settings as outlined in
verify settings".
Values of the logical signals for SAPFRC are available on the local HMI under Main
menu/Tests/Function status/Frequency/SAPFRC(81,df/dt)/SAPFRC:X. The
Signal Monitoring in PCM600 shows the same signals that are available on the local
HMI.

Verifying the settings

Verification of START value and time delay to operate
1. Check that the appropriate settings are available in the IED, especially the
START value and the definite time delay. Set StartFreqGrad, 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 StartFreqGrad, and check that the
START 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 START 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 StartFreqGrad.
2. The tests above can be repeated to test the RESTORE signal, when the frequency
recovers from a low value.

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/TESTMODE:1. If another function
is tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Frequency/SAPFRC(81,df/dt)/SAPFRC: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
Testing functionality
5.1 "Preparing the IED to
93