Completing The Test; Frequency Protection; Underfrequency Protection Saptuf; Verifying The Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
8. Activate the VTSU binary input.
9. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
10. Reset the VTSU 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.
11.5.5.2

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.
11.6

Frequency protection

11.6.1

Underfrequency protection SAPTUF

Prepare the IED for verification of settings outlined in Section
settings".
11.6.1.1

Verifying the settings

Verification of START value and time delay to operate
1. Check that the IED settings are appropriate, for example the start value and the time
delay.
2. Supply the IED with three-phase voltages at their rated values and initial frequency.
The initial frequency is calculated using Equation 26.
StartFrequency
IECEQUATION16059 V1 EN-US
3. Slowly decrease the voltage frequency by steps of 40 mHz until the START signal
appears; during each step apply the voltage signal for a time that is either at least 10%
longer than (
4. Note the frequency value at which the START signal appears and compare it with the set
value
5. Increase the frequency until its rated value is reached.
6. Check that the START signal resets.
7. Supply the IED with three-phase voltages at their rated values and frequency 20 mHz over
the set value
8. Decrease the frequency with a 40 mHz step, applying it for a time that is at least 10%
longer than (
9. Measure the time delay of the
that the measured time consists of the set value of the time delay plus the minimum
operate time of the start function (80 - 90 ms).
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.
128
   
0.02 floor f StartFrequency

r
tDelay +100ms) or a suitable time to monitor the function.
StartFrequency .
StartFrequency .
tDelay +100ms).
© Copyright 2017 ABB. All rights reserved
 
/ 0.04 0.04

TRIP signal, and compare it with the set value tDelay . Note
1MRK 511 403-UEN E
tRestore time.
TESTMODE setting to Off .
"Preparing the IED to verify
(Equation 26)
Bay control REC670
Commissioning manual
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