Completing The Test; Restricted Earth Fault Protection, Low Impedance Refpdif; Verifying The Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
1. Connect single-phase or three-phase test set to inject the operating voltage. The
injection is done across the measuring branch.
2. Increase the voltage and make note of the operate value
testing and without trip of the test set.
3. Connect the trip contact to the test set to stop the test set for measurement of trip
times below.
4. Reduce the voltage slowly and make note of the reset value. The reset value must be high
for this function.
Check the operating time by injecting a voltage corresponding to 1.2 ˣ
5.
note of the measured trip time.
If required, verify the trip time at another voltage. Normally 2 ˣ
6.
7. If used, measure the alarm level operating value. Increase the voltage and make note of
the operate value
8. Measure the operating time on the alarm output by connecting the stop of the test set to
an output from
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.
11.3.2.2

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.
11.3.3

Restricted earth fault protection, low impedance REFPDIF

Prepare the IED for verification of settings outlined in Section
settings".
11.3.3.1

Verifying the settings

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
6. Switch on the current and note the operate time.
7. Connect the test set to terminal L1 and neutral of the three-phase current input
configured to REFPDIF. Also inject a current higher than half the
98
The required trip and alarm voltage, as well as the used stabilizing
resistance value must be set in the function. Note as well that used CT
input in the IED must have ratio set as 1:1. This is essential for the
measurement of the expected value. Normally a slightly higher operating
value is no problem as the sensitivity is not influenced much.
U>Alarm . This is done with manual test and without trip of the test set.
tAlarm . Inject a voltage 1.2 ˣ U>Alarm and measure the alarm time.
Information on how to use the event menu is found in the operator's manual.
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1MRK 504 165-UEN E
U>Trip . This is done by manual
U>Trip level. Make
U>Trip is selected.
TESTMODE setting to Off .
"Preparing the IED to verify
IdMin setting.
IdMin setting in the
Transformer protection RET670
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