5. Check the operating time by injecting a voltage corresponding to 1.2 ˣ
U>Trip
level. Make note of the measured trip time.
6. If required, verify the trip time at another voltage. Normally 2 ˣ U>Trip is
selected.
7. If used, measure the alarm level operating value. Increase the voltage and
make note of the operate value U>Alarm. This is done with manual test and
without trip of the test set.
8. Measure the operating time on the alarm output by connecting the stop of the
test set to an output from tAlarm. Inject a voltage 1.2 ˣ U>Alarm and measure
the alarm time.
9. Check that trip and alarm outputs operate according to the configuration
logic.
10. Finally check that start and alarm information is stored in the event menu and
if a serial connection to the SA is available verify that the correct and only the
required signals are presented on the local HMI and on the SCADA system.
Information on how to use the event menu is found in the operator's
manual.
11.3.1.2 Completing the test
SEMOD55257-73 v4
Continue to test another function or end the test by changing the TESTMODE
setting to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
11.3.2 Restricted earth fault protection, low impedance REFPDIF
SEMOD55252-82 v8
Prepare the IED for verification of settings outlined in Section "Preparing the IED
to verify settings".
11.3.2.1
Verifying the settings
SEMOD55252-86 v11
1.
Connect the test set for single-phase current injection to the protection
terminals connected to the CT in the power transformer neutral-to-earth
circuit.
2. Increase the injection current and note the operating value of the protection
function.
3. Check that all trip and start signals appear according to the configuration
logic.
4. Decrease the current slowly from operate value and note the reset value.
5. Connect the timer and set the current to ten times the value of the IdMin
setting.
6. Switch on the current and note the operate time.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
106 Line differential protection RED670 2.2 IEC
Commissioning manual
To Next Page
Loading...
