7. Connect the test set to terminal L1 and neutral of the two-phase current input
configured to REFPDIF. Also inject a current higher than half the IdMin
setting in the neutral-to-earth circuit with the same phase angle and with
polarity corresponding to an internal fault.
8. Increase the current injected in L1, and note the operate value. Decrease the
current slowly and note the reset value.
9. Inject current into terminal L2 in the same way as in step 7 above and note
the operate and reset values.
10. Inject a current equal to half the IdMin setting into terminal L1.
11. Inject a current in the neutral-to-earth circuit with the same phase angle,
amplitude and polarity corresponding to an external fault.
12. Increase the current to five times the operating value and check that the
protection does not operate.
13. Finally check that trip information is stored in the event and disturbance
recorder.
10.3.1.2 Completing the test
SEMOD55252-118 v5
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.
10.3.2 Single-phase railway power transformer differential
protection T1PPDIF
GUID-BF394A36-7CDA-46EB-B855-94B4DF5947B9 v2
Set the IED in Test Mode, and release the function to be tested. All other settings
should be the same as when the IED is in operation.
Logical signal values for the single-phase railway power transformer differential
protection (T1PPDIF) are available on the local HMI under Main menu/Test/
Function status/Differential Protection/T1PPDIF
To verify the signals and settings, the following fault types should be tested:
• Restrained protection
• Unrestrained protection
• Directional unrestrained protection
• Directional sensitive protection
• Differential Alarm
• Blocking functionality
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
78 Railway application RER670 2.2 IEC
Commissioning manual
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