Completing The Test; Rate-Of-Change Frequency Protection Sapfrc; Verifying The Settings - ABB ret650 Commissioning Manual

Section 6
Testing functionality
6.6.2.2
6.6.3
6.6.3.1
64
5. Slowly increase the frequency of the applied voltage, to a value above
StartFrequency.
6. Check that the START signal does not appear.
7. Wait for a time corresponding to tDelay, and make sure that the TRIP signal
does not appear.

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/SAPTOF(81,f>)/X:SAPTOF 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.

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)/X:SAPFRC.
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
1MRK 504 126-UEN -
5.1 "Preparing the IED to
Commissioning Manual