Completing The Test; Rate-Of-Change Frequency Protection Sapfrc; Verifying The Settings - ABB RET670 Installation And Commissioning Manual

Section 13
Verifying settings by secondary injection
13.8.2.2
13.8.3
13.8.3.1
166
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
1. Check that the settings in the IED are appropriate, especially the
StartFrequency, IntBlocklevel, and the TimeDlyOperate.
2. Supply the IED with three-phase voltages at their 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 set value,
IntBlocklevel.
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 TimeDlyOperate, and make sure that the
TRIP signal does not appear.

Completing the test

Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.

Rate-of-change frequency protection SAPFRC

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"

Verifying the settings

in this chapter.
1MRK 504 088-UEN C
"Overview"
Installation and commissioning manual
and