Completing The Test - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
4. Inject the measured voltages at rated values for at least set
5. Activate the CBOPEN binary input.
6. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
7. Inject the measured voltages at rated values for at least set
8. Activate the BLKU binary input.
9. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
10. Reset the BLKU binary input.
11. Inject the measured voltages at rated values for at least set
12. Activate the BLOCK binary input.
13. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
14. Reset the BLOCK binary input.
10.6.6.2

Completing the test

Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
10.7 Frequency protection
10.7.1 Underfrequency protection SAPTUF (81)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
10.7.1.1 Verifying the settings
Verification of PICKUP value and time delay to trip
1. Check that the IED settings are appropriate, for example the PICKUP value and the 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. Note the trip value and compare it with the set value.
6. Increase the frequency until rated operating levels are reached.
7. Check that the PICKUP signal resets.
8. Instantaneously decrease the frequency of the applied voltage to a value about 1% lower
than the trip value (a step change more than 2% will increase the time delay).
9. Measure the time delay of the TRIP signal, and compare it with the set value. Note that the
measured time consists of the set value for time delay plus minimum trip time of the pickup
start function (80 - 90 ms).
176
Note that TRIP at this time is a pulse signal, duration should be according to
tPulse .
set
in this chapter.
1MRK 504 154-UUS B
tRestore time.
tRestore time.
tRestore time.
TestMode setting to Disabled .
"Requirements" and
Commissioning manual
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