Verifying The Settings; Completing The Test; Additional Security Logic For Differential Protection Ldrgfc (11) - Hitachi Relion 670 Series Commissioning Manual

1MRK506371-UUS Rev. M
11.3.1.1

Verifying the settings

1. Connect a 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 trip value Pickup. This is done by manual 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.
5. Check the operating time by injecting a voltage corresponding to 1.2 ˣ Pickup level. Make note of
the measured trip time.
6. If required, verify the trip time at another voltage. Normally 2 ˣ Pickup is selected.
7. If used, measure the alarm level operating value. Increase the voltage and make note of the trip
value AlarmPickup. 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 AlarmPickup and measure the alarm time.
9. Check that trip and alarm outputs trip according to the configuration logic.
10. Finally check that pickup 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.
11.3.1.2

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.3.2

Additional security logic for differential protection LDRGFC (11)

11.3.2.1 Verifying the settings
Prepare the IED for verification of settings outlined in section 1 "Overview" and section 2 "Preparing for
test" in this chapter.
Current variation local criteria
Procedure
1. Set Operation to Enabled.
2. Connect the test set for three phase current injection to the appropriate IED terminals.
3. Inject symmetrical phase currents equal to half the rated current
Line distance protection REL670
Commissioning manual
The required trip and alarm voltage, as well as the used stabilizing resistance value must be
set in the function. Note as well that the used CT input in the IED must have the 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.
Information on how to use the event menu is found in the operator's manual.
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Section 11
Testing functionality by secondary injection
SEMOD55257-46 v5
SEMOD55257-73 v4
GUID-0E064528-0E70-4FA1-87C7-581DADC1EB55 v3
GUID-D9F626D4-4038-416F-888E-D3DB5047E79A v2
GUID-804E13B6-DC31-487B-A582-7886B1EF3EB7 v3
89