10.3.2.5 Verifying the differential alarm
GUID-81496723-AF55-41A1-9EDB-711E28D3DBAC v2
1. Use settings for the installation.
2. Inject currents corresponding to the transformer rated current on both sides so
that the differential current is 0% and the bias current is 100%.
3. Decrease the injected current on one side until IDALARM is set, and note the
value and alarm delay.
4. Increase the injected current until IDALARM resets, and note the value.
10.3.2.6 Verifying the blocking functionality
GUID-B7A67797-F6BE-45CB-8502-A4C26119430A v2
1. Use the settings for the installation.
2. Inject currents corresponding to the transformer rated current on both sides so
that the differential current is 0% and the bias current is 100%.
3. Decrease the injected current on one side until TRRES is set.
4. Increase the 2nd harmonic on one side above I2/I1Ratio and verify that
TRRES is reset (blocked).
5.
If required, use the same procedure to test the 5
th
harmonic blocking feature.
10.3.2.7 Completing the test
GUID-FBE8F3A7-2ADE-4C60-9590-FC4B34D8AC56 v1
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.
10.4 Impedance protection
SEMOD53525-1 v2
10.4.1 Automatic switch onto fault logic ZCVPSOF
M13850-2 v9
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
The automatic switch onto fault logic function ZCVPSOF is checked using
secondary injection tests. ZCVPSOF is activated either by the external input BC or
by the internal DLD. FUFSPVC is done with a pre-fault condition where the phase
voltages and currents are at zero. A reverse two-phase fault with zero impedance
and a two-phase fault with an impedance corresponding to the whole line is
applied. This fault shall cause an instantaneous trip and result in a TRIP indication.
10.4.1.1 Activating ZCVPSOF externally
M13850-14 v8
1. Set AutoInitMode to DLD disabled and Mode to Impedance.
2. Activate the switch onto fault BC input.
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
80 Railway application RER670 2.2 IEC
Commissioning manual
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